Merge 712d476de for LLVM update to 353983HEADmastermainllvm-r353983

Change-Id: I6635ce126bb89a38fab94e3e332d89ae703cd665

6589 files changed, 64313 insertions, 41946 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d090860e4..0be001503 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,7 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   project(libcxx CXX C)
 
   set(PACKAGE_NAME libcxx)
-  set(PACKAGE_VERSION 8.0.0svn)
+  set(PACKAGE_VERSION 9.0.0svn)
   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
   set(PACKAGE_BUGREPORT "llvm-bugs@lists.llvm.org")
 
@@ -224,6 +224,7 @@ option(LIBCXXABI_ENABLE_STATIC_UNWINDER "Statically link the LLVM unwinder." OFF
 
 # Target options --------------------------------------------------------------
 option(LIBCXX_BUILD_32_BITS "Build 32 bit libc++." ${LLVM_BUILD_32_BITS})
+set(LIBCXX_TARGET_TRIPLE "" CACHE STRING "Use alternate target triple.")
 set(LIBCXX_SYSROOT "" CACHE STRING "Use alternate sysroot.")
 set(LIBCXX_GCC_TOOLCHAIN "" CACHE STRING "Use alternate GCC toolchain.")
 
@@ -283,6 +284,9 @@ endif()
 option(LIBCXX_CONFIGURE_IDE "Configure libcxx for use within an IDE"
       ${LIBCXX_CONFIGURE_IDE_DEFAULT})
 
+option(LIBCXX_HERMETIC_STATIC_LIBRARY
+  "Do not export any symbols from the static library." OFF)
+
 #===============================================================================
 # Check option configurations
 #===============================================================================
@@ -457,20 +461,30 @@ include(HandleLibcxxFlags)
 # 'config-ix' use them during feature checks. It also adds them to both
 # 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'
 add_target_flags_if(LIBCXX_BUILD_32_BITS "-m32")
-add_target_flags_if(LIBCXX_TARGET_TRIPLE "--target=${LIBCXX_TARGET_TRIPLE}")
-add_target_flags_if(LIBCXX_SYSROOT "--sysroot=${LIBCXX_SYSROOT}")
-add_target_flags_if(LIBCXX_GCC_TOOLCHAIN "--gcc-toolchain=${LIBCXX_GCC_TOOLCHAIN}")
-if (LIBCXX_TARGET_TRIPLE)
+
+if(LIBCXX_TARGET_TRIPLE)
+  add_target_flags("--target=${LIBCXX_TARGET_TRIPLE}")
+elseif(CMAKE_CXX_COMPILER_TARGET)
+  set(LIBCXX_TARGET_TRIPLE "${CMAKE_CXX_COMPILER_TARGET}")
+endif()
+if(LIBCXX_SYSROOT)
+  add_target_flags("--sysroot=${LIBCXX_SYSROOT}")
+elseif(CMAKE_SYSROOT)
+  set(LIBCXX_SYSROOT "${CMAKE_SYSROOT}")
+endif()
+if(LIBCXX_GCC_TOOLCHAIN)
+  add_target_flags("--gcc-toolchain=${LIBCXX_GCC_TOOLCHAIN}")
+elseif(CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN)
+  set(LIBCXX_GCC_TOOLCHAIN "${CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN}")
+endif()
+
+if(LIBCXX_TARGET_TRIPLE)
   set(TARGET_TRIPLE "${LIBCXX_TARGET_TRIPLE}")
 endif()
 
 # Configure compiler.
 include(config-ix)
 
-if (LIBCXX_USE_COMPILER_RT)
-  list(APPEND LIBCXX_LINK_FLAGS "-rtlib=compiler-rt")
-endif()
-
 # Configure coverage options.
 if (LIBCXX_GENERATE_COVERAGE)
   include(CodeCoverage)
@@ -508,11 +522,12 @@ remove_flags("/D_DEBUG" "/MTd" "/MDd" "/MT" "/Md")
 remove_flags(-Wno-pedantic -pedantic-errors -pedantic)
 
 # Required flags ==============================================================
-set(LIBCXX_STANDARD_VER c++11 CACHE INTERNAL "internal option to change build dialect")
 if (LIBCXX_HAS_MUSL_LIBC OR LIBCXX_TARGETING_CLANG_CL)
   # musl's pthread implementations uses volatile types in their structs which is
   # not a constexpr in C++11 but is in C++14, so we use C++14 with musl.
-  set(LIBCXX_STANDARD_VER c++14 CACHE INTERNAL "internal option to change build dialect")
+  set(LIBCXX_STANDARD_VER c++14 CACHE STRING "internal option to change build dialect")
+else()
+  set(LIBCXX_STANDARD_VER c++11 CACHE STRING "internal option to change build dialect")
 endif()
 add_compile_flags_if_supported(-std=${LIBCXX_STANDARD_VER})
 add_compile_flags_if_supported("/std:${LIBCXX_STANDARD_VER}")
diff --git a/LICENSE.TXT b/LICENSE.TXT
index c278f2c92..e159d2834 100644
--- a/LICENSE.TXT
+++ b/LICENSE.TXT
@@ -1,5 +1,240 @@
 ==============================================================================
-libc++ License
+The LLVM Project is under the Apache License v2.0 with LLVM Exceptions:
+==============================================================================
+
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+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
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+       http://www.apache.org/licenses/LICENSE-2.0
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+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
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+---- LLVM Exceptions to the Apache 2.0 License ----
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+As an exception, if, as a result of your compiling your source code, portions
+of this Software are embedded into an Object form of such source code, you
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+with the conditions of Sections 4(a), 4(b) and 4(d) of the License.
+
+In addition, if you combine or link compiled forms of this Software with
+software that is licensed under the GPLv2 ("Combined Software") and if a
+court of competent jurisdiction determines that the patent provision (Section
+3), the indemnity provision (Section 9) or other Section of the License
+conflicts with the conditions of the GPLv2, you may retroactively and
+prospectively choose to deem waived or otherwise exclude such Section(s) of
+the License, but only in their entirety and only with respect to the Combined
+Software.
+
+==============================================================================
+Software from third parties included in the LLVM Project:
+==============================================================================
+The LLVM Project contains third party software which is under different license
+terms. All such code will be identified clearly using at least one of two
+mechanisms:
+1) It will be in a separate directory tree with its own `LICENSE.txt` or
+   `LICENSE` file at the top containing the specific license and restrictions
+   which apply to that software, or
+2) It will contain specific license and restriction terms at the top of every
+   file.
+
+==============================================================================
+Legacy LLVM License (https://llvm.org/docs/DeveloperPolicy.html#legacy):
 ==============================================================================
 
 The libc++ library is dual licensed under both the University of Illinois
@@ -14,7 +249,7 @@ Full text of the relevant licenses is included below.
 University of Illinois/NCSA
 Open Source License
 
-Copyright (c) 2009-2017 by the contributors listed in CREDITS.TXT
+Copyright (c) 2009-2019 by the contributors listed in CREDITS.TXT
 
 All rights reserved.
 
diff --git a/benchmarks/CMakeLists.txt b/benchmarks/CMakeLists.txt
index 3823b87b3..637035e5c 100644
--- a/benchmarks/CMakeLists.txt
+++ b/benchmarks/CMakeLists.txt
@@ -137,6 +137,7 @@ function(add_benchmark_test name source_file)
   add_executable(${libcxx_target} EXCLUDE_FROM_ALL ${source_file})
   add_dependencies(${libcxx_target} cxx cxx-headers google-benchmark-libcxx)
   add_dependencies(cxx-benchmarks ${libcxx_target})
+  target_link_libraries(${libcxx_target} ${LIBCXX_LIBRARIES})
   if (LIBCXX_ENABLE_SHARED)
     target_link_libraries(${libcxx_target} cxx_shared)
   else()
diff --git a/benchmarks/CartesianBenchmarks.hpp b/benchmarks/CartesianBenchmarks.hpp
index 88a994c55..89b6d854b 100644
--- a/benchmarks/CartesianBenchmarks.hpp
+++ b/benchmarks/CartesianBenchmarks.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/benchmarks/function.bench.cpp b/benchmarks/function.bench.cpp
index 4f0e1fd80..5cc3e7105 100644
--- a/benchmarks/function.bench.cpp
+++ b/benchmarks/function.bench.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/benchmarks/ordered_set.bench.cpp b/benchmarks/ordered_set.bench.cpp
index b2ef0725b..e179aac45 100644
--- a/benchmarks/ordered_set.bench.cpp
+++ b/benchmarks/ordered_set.bench.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/benchmarks/util_smartptr.bench.cpp b/benchmarks/util_smartptr.bench.cpp
index c984b2ca6..053cbd659 100644
--- a/benchmarks/util_smartptr.bench.cpp
+++ b/benchmarks/util_smartptr.bench.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/cmake/Modules/CheckLibcxxAtomic.cmake b/cmake/Modules/CheckLibcxxAtomic.cmake
index 98862d423..1e6e5e637 100644
--- a/cmake/Modules/CheckLibcxxAtomic.cmake
+++ b/cmake/Modules/CheckLibcxxAtomic.cmake
@@ -24,7 +24,7 @@ function(check_cxx_atomics varname)
 #include <atomic>
 std::atomic<uintptr_t> x;
 std::atomic<uintmax_t> y;
-int main() {
+int main(int, char**) {
   return x + y;
 }
 " ${varname})
diff --git a/cmake/Modules/HandleOutOfTreeLLVM.cmake b/cmake/Modules/HandleOutOfTreeLLVM.cmake
index 70eed1d70..11c133155 100644
--- a/cmake/Modules/HandleOutOfTreeLLVM.cmake
+++ b/cmake/Modules/HandleOutOfTreeLLVM.cmake
@@ -116,7 +116,7 @@ macro(configure_out_of_tree_llvm)
     # Required LIT Configuration ------------------------------------------------
     # Define the default arguments to use with 'lit', and an option for the user
     # to override.
-    set(LLVM_EXTERNAL_LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
+    set(LLVM_DEFAULT_EXTERNAL_LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
     set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
     if (MSVC OR XCODE)
       set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
diff --git a/docs/BuildingLibcxx.rst b/docs/BuildingLibcxx.rst
index c40e5fbcc..01f442de3 100644
--- a/docs/BuildingLibcxx.rst
+++ b/docs/BuildingLibcxx.rst
@@ -18,33 +18,10 @@ Xcode 4.2 or later.  However if you want to install tip-of-trunk from here
 
 The basic steps needed to build libc++ are:
 
-#. Checkout LLVM:
-
-   * ``cd where-you-want-llvm-to-live``
-   * ``svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm``
-
-#. Checkout libc++:
-
-   * ``cd where-you-want-llvm-to-live``
-   * ``cd llvm/projects``
-   * ``svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx``
-
-#. Checkout libc++abi:
-
-   * ``cd where-you-want-llvm-to-live``
-   * ``cd llvm/projects``
-   * ``svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi``
-
-#. Configure and build libc++ with libc++abi:
-
-   CMake is the only supported configuration system.
-
-   Clang is the preferred compiler when building and using libc++.
-
-   * ``cd where you want to build llvm``
-   * ``mkdir build``
-   * ``cd build``
-   * ``cmake -G <generator> [options] <path to llvm sources>``
+#. Checkout and configure LLVM (including libc++ and libc++abi), according to the `LLVM
+   getting started <https://llvm.org/docs/GettingStarted.html>`_ documentation. Make sure
+   to include ``libcxx`` and ``libcxxabi`` in the ``LLVM_ENABLE_PROJECTS`` option passed
+   to CMake.
 
    For more information about configuring libc++ see :ref:`CMake Options`.
 
@@ -71,23 +48,21 @@ The instructions are for building libc++ on
 FreeBSD, Linux, or Mac using `libc++abi`_ as the C++ ABI library.
 On Linux, it is also possible to use :ref:`libsupc++ <libsupcxx>` or libcxxrt.
 
-It is sometimes beneficial to build outside of the LLVM tree. An out-of-tree
-build would look like this:
+It is sometimes beneficial to build separately from the full LLVM build. An
+out-of-tree build would look like this:
 
 .. code-block:: bash
 
   $ cd where-you-want-libcxx-to-live
-  $ # Check out llvm, libc++ and libc++abi.
-  $ ``svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm``
-  $ ``svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx``
-  $ ``svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi``
+  $ # Check out the sources (includes everything, but we'll only use libcxx)
+  $ ``git clone https://github.com/llvm/llvm-project.git``
   $ cd where-you-want-to-build
   $ mkdir build && cd build
   $ export CC=clang CXX=clang++
-  $ cmake -DLLVM_PATH=path/to/llvm \
+  $ cmake -DLLVM_PATH=path/to/separate/llvm \
           -DLIBCXX_CXX_ABI=libcxxabi \
-          -DLIBCXX_CXX_ABI_INCLUDE_PATHS=path/to/libcxxabi/include \
-          path/to/libcxx
+          -DLIBCXX_CXX_ABI_INCLUDE_PATHS=path/to/separate/libcxxabi/include \
+          path/to/llvm-project/libcxx
   $ make
   $ make check-libcxx # optional
 
@@ -222,6 +197,15 @@ libc++ specific options
 
   Define libc++ destination prefix.
 
+.. option:: LIBCXX_HERMETIC_STATIC_LIBRARY:BOOL
+
+  **Default**: ``OFF``
+
+  Do not export any symbols from the static libc++ library. This is useful when
+  This is useful when the static libc++ library is being linked into shared
+  libraries that may be used in with other shared libraries that use different
+  C++ library. We want to avoid avoid exporting any libc++ symbols in that case.
+
 .. _libc++experimental options:
 
 libc++experimental Specific Options
diff --git a/docs/DesignDocs/AvailabilityMarkup.rst b/docs/DesignDocs/AvailabilityMarkup.rst
index 4e6d80b50..f076dfecd 100644
--- a/docs/DesignDocs/AvailabilityMarkup.rst
+++ b/docs/DesignDocs/AvailabilityMarkup.rst
@@ -51,6 +51,12 @@ or on a particular symbol:
 
     _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void  operator delete(void* __p, std::size_t __sz) _NOEXCEPT;
 
+Furthermore, a lit feature should be added to match that availability macro,
+so that tests depending on that feature can be marked to XFAIL if the feature
+is not supported. This way, the test suite will work on platforms that have
+not shipped the feature yet. This can be done by adding the appropriate lit
+feature in test/config.py.
+
 
 Testing
 =======
diff --git a/docs/DesignDocs/CapturingConfigInfo.rst b/docs/DesignDocs/CapturingConfigInfo.rst
index 29156bff8..8f2d0cd2d 100644
--- a/docs/DesignDocs/CapturingConfigInfo.rst
+++ b/docs/DesignDocs/CapturingConfigInfo.rst
@@ -56,10 +56,9 @@ configuration all together. An example "__config" header generated when
 
   //===----------------------------------------------------------------------===//
   //
-  //                     The LLVM Compiler Infrastructure
-  //
-  // This file is dual licensed under the MIT and the University of Illinois Open
-  // Source Licenses. See LICENSE.TXT for details.
+  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+  // See https://llvm.org/LICENSE.txt for license information.
+  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   //
   //===----------------------------------------------------------------------===//
 
@@ -77,10 +76,9 @@ configuration all together. An example "__config" header generated when
   // -*- C++ -*-
   //===--------------------------- __config ---------------------------------===//
   //
-  //                     The LLVM Compiler Infrastructure
-  //
-  // This file is dual licensed under the MIT and the University of Illinois Open
-  // Source Licenses. See LICENSE.TXT for details.
+  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+  // See https://llvm.org/LICENSE.txt for license information.
+  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   //
   //===----------------------------------------------------------------------===//
 
diff --git a/docs/DesignDocs/DebugMode.rst b/docs/DesignDocs/DebugMode.rst
index 3b997d446..1ce438d53 100644
--- a/docs/DesignDocs/DebugMode.rst
+++ b/docs/DesignDocs/DebugMode.rst
@@ -53,7 +53,7 @@ assertion handler as follows:
 
   #define _LIBCPP_DEBUG 1
   #include <string>
-  int main() {
+  int main(int, char**) {
     std::__libcpp_debug_function = std::__libcpp_throw_debug_function;
     try {
       std::string::iterator bad_it;
diff --git a/docs/DesignDocs/FeatureTestMacros.rst b/docs/DesignDocs/FeatureTestMacros.rst
new file mode 100644
index 000000000..2fbba6547
--- /dev/null
+++ b/docs/DesignDocs/FeatureTestMacros.rst
@@ -0,0 +1,45 @@
+===================
+Feature Test Macros
+===================
+
+.. contents::
+   :local:
+
+Overview
+========
+
+Libc++ implements the C++ feature test macros as specified in the C++2a standard,
+and before that in non-normative guiding documents
+(`See cppreference <https://en.cppreference.com/w/User:D41D8CD98F/feature_testing_macros>`_)
+
+
+Design
+======
+
+Feature test macros are tricky to track, implement, test, and document correctly.
+They must be available from a list of headers, they may have different values in
+different dialects, and they may or may not be implemented by libc++. In order to
+track all of these conditions correctly and easily, we want a Single Source of
+Truth (SSoT) that defines each feature test macro, its values, the headers it
+lives in, and whether or not is is implemented by libc++. From this SSoA we
+have enough information to automatically generate the `<version>` header,
+the tests, and the documentation.
+
+Therefore we maintain a SSoA in `libcxx/utils/generate_feature_test_macro_components.py`
+which doubles as a script to generate the following components:
+
+* The `<version>` header.
+* The version tests under `support.limits.general`.
+* Documentation of libc++'s implementation of each macro.
+
+Usage
+=====
+
+The `generate_feature_test_macro_components.py` script is used to track and
+update feature test macros in libc++.
+
+Whenever a feature test macro is added or changed, the table should be updated
+and the script should be re-ran. The script will clobber the existing test files
+and the documentation and it will generate a new `<version>` header as a
+temporary file. The generated `<version>` header should be merged with the
+existing one.
diff --git a/docs/DesignDocs/FileTimeType.rst b/docs/DesignDocs/FileTimeType.rst
index 488ff174b..f1e9edd87 100644
--- a/docs/DesignDocs/FileTimeType.rst
+++ b/docs/DesignDocs/FileTimeType.rst
@@ -119,7 +119,7 @@ to throw in cases where the user was confident the call should succeed. (See bel
     set_file_times("/tmp/foo", new_times); // OK, supported by most FSes
   }
 
-  int main() {
+  int main(int, char**) {
     path p = "/tmp/foo";
     file_status st = status(p);
     if (!exists(st) || !is_regular_file(st))
@@ -128,6 +128,7 @@ to throw in cases where the user was confident the call should succeed. (See bel
       return 1;
     // It seems reasonable to assume this call should succeed.
     file_time_type tp = last_write_time(p); // BAD! Throws value_too_large.
+    return 0;
   }
 
 
diff --git a/docs/FeatureTestMacroTable.rst b/docs/FeatureTestMacroTable.rst
new file mode 100644
index 000000000..d900497eb
--- /dev/null
+++ b/docs/FeatureTestMacroTable.rst
@@ -0,0 +1,200 @@
+.. _FeatureTestMacroTable:
+
+==========================
+Feature Test Macro Support
+==========================
+
+.. contents::
+   :local:
+
+Overview
+========
+
+This file documents the feature test macros currently supported by libc++.
+
+.. _feature-status:
+
+Status
+======
+
+.. table:: Current Status
+     :name: feature-status-table
+     :widths: auto
+     
+    ================================================= =================
+    Macro Name                                        Value            
+    ================================================= =================
+    **C++ 14**                                                         
+    -------------------------------------------------------------------
+    ``__cpp_lib_chrono_udls``                         ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_complex_udls``                        ``201309L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_exchange_function``                   ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_generic_associative_lookup``          ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_integer_sequence``                    ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_integral_constant_callable``          ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_is_final``                            ``201402L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_is_null_pointer``                     ``201309L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_make_reverse_iterator``               ``201402L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_make_unique``                         ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_null_iterators``                      ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_quoted_string_io``                    ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_result_of_sfinae``                    ``201210L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_robust_nonmodifying_seq_ops``         ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_shared_timed_mutex``                  ``201402L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_string_udls``                         ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_transformation_trait_aliases``        ``201304L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_transparent_operators``               ``201210L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_tuple_element_t``                     ``201402L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_tuples_by_type``                      ``201304L``      
+    ------------------------------------------------- -----------------
+    **C++ 17**                                                         
+    -------------------------------------------------------------------
+    ``__cpp_lib_addressof_constexpr``                 ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_allocator_traits_is_always_equal``    ``201411L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_any``                                 ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_apply``                               ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_array_constexpr``                     ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_as_const``                            ``201510L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_atomic_is_always_lock_free``          ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_bool_constant``                       ``201505L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_boyer_moore_searcher``                *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_byte``                                ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_chrono``                              ``201611L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_clamp``                               ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_enable_shared_from_this``             ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_execution``                           *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_filesystem``                          ``201703L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_gcd_lcm``                             ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_hardware_interference_size``          ``201703L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_has_unique_object_representations``   ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_hypot``                               ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_incomplete_container_elements``       ``201505L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_invoke``                              ``201411L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_is_aggregate``                        ``201703L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_is_invocable``                        ``201703L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_is_swappable``                        ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_launder``                             ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_logical_traits``                      ``201510L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_make_from_tuple``                     ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_map_try_emplace``                     ``201411L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_math_special_functions``              *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_memory_resource``                     *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_node_extract``                        ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_nonmember_container_access``          ``201411L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_not_fn``                              ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_optional``                            ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_parallel_algorithm``                  *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_raw_memory_algorithms``               ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_sample``                              ``201603L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_scoped_lock``                         ``201703L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_shared_mutex``                        ``201505L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_shared_ptr_arrays``                   *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_shared_ptr_weak_type``                ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_string_view``                         ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_to_chars``                            *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_transparent_operators``               ``201510L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_type_trait_variable_templates``       ``201510L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_uncaught_exceptions``                 ``201411L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_unordered_map_try_emplace``           ``201411L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_variant``                             ``201606L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_void_t``                              ``201411L``      
+    ------------------------------------------------- -----------------
+    **C++ 2a**                                                         
+    -------------------------------------------------------------------
+    ``__cpp_lib_atomic_ref``                          *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_bind_front``                          *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_bit_cast``                            *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_char8_t``                             ``201811L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_concepts``                            *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_constexpr_misc``                      *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_constexpr_swap_algorithms``           *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_destroying_delete``                   *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_erase_if``                            ``201811L``      
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_generic_unordered_lookup``            *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_is_constant_evaluated``               *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_list_remove_return_type``             *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_ranges``                              *unimplemented*  
+    ------------------------------------------------- -----------------
+    ``__cpp_lib_three_way_comparison``                *unimplemented*  
+    ================================================= =================
+
+
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 20be9f627..29cee4418 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -1,5 +1,5 @@
 ========================================
-Libc++ 8.0.0 (In-Progress) Release Notes
+Libc++ 9.0.0 (In-Progress) Release Notes
 ========================================
 
 .. contents::
@@ -10,7 +10,7 @@ Written by the `Libc++ Team <https://libcxx.llvm.org>`_
 
 .. warning::
 
-   These are in-progress notes for the upcoming libc++ 8 release.
+   These are in-progress notes for the upcoming libc++ 9 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
@@ -18,7 +18,7 @@ Introduction
 ============
 
 This document contains the release notes for the libc++ C++ Standard Library,
-part of the LLVM Compiler Infrastructure, release 8.0.0. Here we describe the
+part of the LLVM Compiler Infrastructure, release 9.0.0. Here we describe the
 status of libc++ in some detail, including major improvements from the previous
 release and new feature work. For the general LLVM release notes, see `the LLVM
 documentation <https://llvm.org/docs/ReleaseNotes.html>`_. All LLVM releases may
@@ -32,7 +32,7 @@ main Libc++ web page, this document applies to the *next* release, not
 the current one. To see the release notes for a specific release, please
 see the `releases page <https://llvm.org/releases/>`_.
 
-What's New in Libc++ 8.0.0?
+What's New in Libc++ 9.0.0?
 ===========================
 
 New Features
@@ -40,23 +40,4 @@ New Features
 
 API Changes
 -----------
-- Building libc++ for Mac OSX 10.6 is not supported anymore.
-- Starting with LLVM 8.0.0, users that wish to link together translation units
-  built with different versions of libc++'s headers into the same final linked
-  image MUST define the _LIBCPP_HIDE_FROM_ABI_PER_TU macro to 1 when building
-  those translation units. Not defining _LIBCPP_HIDE_FROM_ABI_PER_TU to 1 and
-  linking translation units built with different versions of libc++'s headers
-  together may lead to ODR violations and ABI issues. On the flipside, code
-  size improvements should be expected for everyone not defining the macro.
-- Starting with LLVM 8.0.0, std::dynarray has been removed from the library.
-  std::dynarray was a feature proposed for C++14 that was pulled from the
-  Standard at the last minute and was never standardized. Since there are no
-  plans to standardize this facility it is being removed.
-- Starting with LLVM 8.0.0, std::bad_array_length has been removed from the
-  library. std::bad_array_length was a feature proposed for C++14 alongside
-  std::dynarray, but it never actually made it into the C++ Standard. There
-  are no plans to standardize this feature at this time. Formally speaking,
-  this removal constitutes an ABI break because the symbols were shipped in
-  the shared library. However, on macOS systems, the feature was not usable
-  because it was hidden behind availability annotations. We do not expect
-  any actual breakage to happen from this change.
+- ...
diff --git a/docs/TestingLibcxx.rst b/docs/TestingLibcxx.rst
index ebbbf628a..d8060fed1 100644
--- a/docs/TestingLibcxx.rst
+++ b/docs/TestingLibcxx.rst
@@ -183,6 +183,14 @@ configuration. Passing the option on the command line will override the default.
   option is specified or the environment variable LIBCXX_COLOR_DIAGNOSTICS is
   present then color diagnostics will be enabled.
 
+.. option:: llvm_unwinder
+
+  Enable the use of LLVM unwinder instead of libgcc.
+
+.. option:: builtins_library
+
+  Path to the builtins library to use instead of libgcc.
+
 
 Environment Variables
 ---------------------
diff --git a/docs/conf.py b/docs/conf.py
index 50b372cf8..e88b2d337 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -47,9 +47,9 @@ copyright = u'2011-2018, LLVM Project'
 # built documents.
 #
 # The short X.Y version.
-version = '8.0'
+version = '9.0'
 # The full version, including alpha/beta/rc tags.
-release = '8.0'
+release = '9.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/docs/index.rst b/docs/index.rst
index bb56f2da0..80c2a8ddd 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -40,6 +40,11 @@ Getting Started with libc++
    TestingLibcxx
 
 
+.. toctree::
+    :hidden:
+
+    FeatureTestMacroTable
+
 Current Status
 --------------
 
@@ -107,6 +112,7 @@ C++ Dialect Support
 * `C++14 - Complete <http://libcxx.llvm.org/cxx1y_status.html>`__
 * `C++17 - In Progress <http://libcxx.llvm.org/cxx1z_status.html>`__
 * `Post C++14 Technical Specifications - In Progress <http://libcxx.llvm.org/ts1z_status.html>`__
+* :ref:`C++ Feature Test Macro Status <feature-status>`
 
 Notes and Known Issues
 ----------------------
@@ -136,6 +142,7 @@ Design Documents
    DesignDocs/VisibilityMacros
    DesignDocs/ThreadingSupportAPI
    DesignDocs/FileTimeType
+   DesignDocs/FeatureTestMacros
 
 * `<atomic> design <http://libcxx.llvm.org/atomic_design.html>`_
 * `<type_traits> design <http://libcxx.llvm.org/type_traits_design.html>`_
@@ -183,5 +190,4 @@ Quick Links
 * `LLVM Bugzilla <https://bugs.llvm.org/>`_
 * `libcxx-commits Mailing List`_
 * `libcxx-dev Mailing List`_
-* `Browse libc++ -- SVN <http://llvm.org/svn/llvm-project/libcxx/trunk/>`_
-* `Browse libc++ -- ViewVC <http://llvm.org/viewvc/llvm-project/libcxx/trunk/>`_
+* `Browse libc++ Sources <https://github.com/llvm/llvm-project/tree/master/libcxx/>`_
diff --git a/fuzzing/fuzz_test.cpp b/fuzzing/fuzz_test.cpp
index 98ebe99bf..9fa6f4334 100644
--- a/fuzzing/fuzz_test.cpp
+++ b/fuzzing/fuzz_test.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- fuzz_test.cpp ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/fuzzing/fuzzing.cpp b/fuzzing/fuzzing.cpp
index ad377bcac..5c32f28a3 100644
--- a/fuzzing/fuzzing.cpp
+++ b/fuzzing/fuzzing.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- fuzzing.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/fuzzing/fuzzing.h b/fuzzing/fuzzing.h
index 06f58904b..64103e590 100644
--- a/fuzzing/fuzzing.h
+++ b/fuzzing/fuzzing.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- fuzzing.h --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
index 73f7cfc4d..3bd09b329 100644
--- a/include/CMakeLists.txt
+++ b/include/CMakeLists.txt
@@ -95,6 +95,7 @@ set(files
   ext/__hash
   ext/hash_map
   ext/hash_set
+  fenv.h
   filesystem
   float.h
   forward_list
diff --git a/include/__bit_reference b/include/__bit_reference
index c208af2b4..4fd1d2f6c 100644
--- a/include/__bit_reference
+++ b/include/__bit_reference
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__bsd_locale_defaults.h b/include/__bsd_locale_defaults.h
index cbc407d10..2ace2a21c 100644
--- a/include/__bsd_locale_defaults.h
+++ b/include/__bsd_locale_defaults.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------- __bsd_locale_defaults.h -----------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // The BSDs have lots of *_l functions.  We don't want to define those symbols
diff --git a/include/__bsd_locale_fallbacks.h b/include/__bsd_locale_fallbacks.h
index 3097b0141..a807fe039 100644
--- a/include/__bsd_locale_fallbacks.h
+++ b/include/__bsd_locale_fallbacks.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------- __bsd_locale_fallbacks.h ----------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // The BSDs have lots of *_l functions.  This file provides reimplementations
diff --git a/include/__config b/include/__config
index 728387642..3ca661516 100644
--- a/include/__config
+++ b/include/__config
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- __config ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #  define _GNUC_VER_NEW 0
 #endif
 
-#define _LIBCPP_VERSION 8000
+#define _LIBCPP_VERSION 9000
 
 #ifndef _LIBCPP_ABI_VERSION
 #  define _LIBCPP_ABI_VERSION 1
@@ -353,6 +352,18 @@
 #  endif // __linux__
 #endif
 
+#ifndef _LIBCPP_CXX03_LANG
+# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp)
+#elif defined(_LIBCPP_COMPILER_CLANG)
+# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp)
+#else
+// This definition is potentially buggy, but it's only taken with GCC in C++03,
+// which we barely support anyway. See llvm.org/PR39713
+# define _LIBCPP_ALIGNOF(_Tp) __alignof(_Tp)
+#endif
+
+#define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)
+
 #if defined(_LIBCPP_COMPILER_CLANG)
 
 // _LIBCPP_ALTERNATE_STRING_LAYOUT is an old name for
@@ -367,7 +378,7 @@
 #  define _ALIGNAS_TYPE(x) alignas(x)
 #  define _ALIGNAS(x) alignas(x)
 #else
-#  define _ALIGNAS_TYPE(x) __attribute__((__aligned__(__alignof(x))))
+#  define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
 #  define _ALIGNAS(x) __attribute__((__aligned__(x)))
 #endif
 
@@ -494,7 +505,7 @@ typedef __char32_t char32_t;
 #elif defined(_LIBCPP_COMPILER_GCC)
 
 #define _ALIGNAS(x) __attribute__((__aligned__(x)))
-#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(__alignof(x))))
+#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
 
 #define _LIBCPP_NORETURN __attribute__((noreturn))
 
@@ -607,7 +618,7 @@ typedef __char32_t char32_t;
 #elif defined(_LIBCPP_COMPILER_IBM)
 
 #define _ALIGNAS(x) __attribute__((__aligned__(x)))
-#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(__alignof(x))))
+#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
 #define _ATTRIBUTE(x) __attribute__((x))
 #define _LIBCPP_NORETURN __attribute__((noreturn))
 
@@ -974,17 +985,18 @@ template <unsigned> struct __static_assert_check {};
 #define _DECLARE_C99_LDBL_MATH 1
 #endif
 
+#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
+#  define _LIBCPP_DEFER_NEW_TO_VCRUNTIME
+#endif
+
 // If we are getting operator new from the MSVC CRT, then allocation overloads
 // for align_val_t were added in 19.12, aka VS 2017 version 15.3.
 #if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912
 #  define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
-#elif defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
-#  define _LIBCPP_DEFER_NEW_TO_VCRUNTIME
-#  if !defined(__cpp_aligned_new)
-     // We're defering to Microsoft's STL to provide aligned new et al. We don't
-     // have it unless the language feature test macro is defined.
-#    define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
-#  endif
+#elif defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME) && !defined(__cpp_aligned_new)
+   // We're defering to Microsoft's STL to provide aligned new et al. We don't
+   // have it unless the language feature test macro is defined.
+#  define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
 #endif
 
 #if defined(__APPLE__)
@@ -1424,6 +1436,8 @@ _LIBCPP_FUNC_VIS extern "C" void __sanitizer_annotate_contiguous_container(
 #  endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
 #endif // _LIBCPP_NO_AUTO_LINK
 
+#define _LIBCPP_UNUSED_VAR(x) ((void)(x))
+
 #endif // __cplusplus
 
 #endif // _LIBCPP_CONFIG
diff --git a/include/__config_site.in b/include/__config_site.in
index 580a6aa4c..0818d6e1d 100644
--- a/include/__config_site.in
+++ b/include/__config_site.in
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__debug b/include/__debug
index a8788f68f..6ccb72cb8 100644
--- a/include/__debug
+++ b/include/__debug
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- __debug ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__errc b/include/__errc
index d0f00b7f0..a8ad29f36 100644
--- a/include/__errc
+++ b/include/__errc
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- __errc ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__functional_03 b/include/__functional_03
index 0a3bfbaa3..a90cbb75b 100644
--- a/include/__functional_03
+++ b/include/__functional_03
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__functional_base b/include/__functional_base
index 032be99bf..8da832454 100644
--- a/include/__functional_base
+++ b/include/__functional_base
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__functional_base_03 b/include/__functional_base_03
index 8407dcfa3..e6dac90c8 100644
--- a/include/__functional_base_03
+++ b/include/__functional_base_03
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__hash_table b/include/__hash_table
index 6f5b18310..4409d6dc5 100644
--- a/include/__hash_table
+++ b/include/__hash_table
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -2372,6 +2371,7 @@ __hash_table<_Tp, _Hash, _Equal, _Alloc>::__node_handle_merge_multi(
 template <class _Tp, class _Hash, class _Equal, class _Alloc>
 void
 __hash_table<_Tp, _Hash, _Equal, _Alloc>::rehash(size_type __n)
+_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
 {
     if (__n == 1)
         __n = 2;
diff --git a/include/__libcpp_version b/include/__libcpp_version
index e002b3628..d58c55a31 100644
--- a/include/__libcpp_version
+++ b/include/__libcpp_version
@@ -1 +1 @@
-8000
+9000
diff --git a/include/__locale b/include/__locale
index cde9cc85f..d1d66f94d 100644
--- a/include/__locale
+++ b/include/__locale
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__mutex_base b/include/__mutex_base
index da21a5f8e..008be9594 100644
--- a/include/__mutex_base
+++ b/include/__mutex_base
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__node_handle b/include/__node_handle
index a9cf3b721..7f3bd9da8 100644
--- a/include/__node_handle
+++ b/include/__node_handle
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__nullptr b/include/__nullptr
index aa3b4d214..45529a710 100644
--- a/include/__nullptr
+++ b/include/__nullptr
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- __nullptr --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__sso_allocator b/include/__sso_allocator
index e16b680ec..393012873 100644
--- a/include/__sso_allocator
+++ b/include/__sso_allocator
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,14 +54,14 @@ public:
             __allocated_ = true;
             return (pointer)&buf_;
         }
-        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), __alignof(_Tp)));
+        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
     }
     _LIBCPP_INLINE_VISIBILITY void deallocate(pointer __p, size_type __n)
     {
         if (__p == (pointer)&buf_)
             __allocated_ = false;
         else
-            _VSTD::__libcpp_deallocate(__p, __n * sizeof(_Tp), __alignof(_Tp));
+            _VSTD::__libcpp_deallocate(__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
     }
     _LIBCPP_INLINE_VISIBILITY size_type max_size() const throw() {return size_type(~0) / sizeof(_Tp);}
 
diff --git a/include/__std_stream b/include/__std_stream
index db90795f6..5a9a470a9 100644
--- a/include/__std_stream
+++ b/include/__std_stream
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__string b/include/__string
index 1ddeec714..a88b976be 100644
--- a/include/__string
+++ b/include/__string
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- __string ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__threading_support b/include/__threading_support
index 202490062..baa1222c3 100644
--- a/include/__threading_support
+++ b/include/__threading_support
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/__tree b/include/__tree
index 814851085..9f0931ee9 100644
--- a/include/__tree
+++ b/include/__tree
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,13 @@ _LIBCPP_PUSH_MACROS
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if defined(__GNUC__) && !defined(__clang__) // gcc.gnu.org/PR37804
+template <class, class, class, class> class _LIBCPP_TEMPLATE_VIS map;
+template <class, class, class, class> class _LIBCPP_TEMPLATE_VIS multimap;
+template <class, class, class> class _LIBCPP_TEMPLATE_VIS set;
+template <class, class, class> class _LIBCPP_TEMPLATE_VIS multiset;
+#endif
+
 template <class _Tp, class _Compare, class _Allocator> class __tree;
 template <class _Tp, class _NodePtr, class _DiffType>
     class _LIBCPP_TEMPLATE_VIS __tree_iterator;
diff --git a/include/__tuple b/include/__tuple
index 69d6ee961..89134b5d2 100644
--- a/include/__tuple
+++ b/include/__tuple
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,36 +21,36 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size;
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size;
 
 #if !defined(_LIBCPP_CXX03_LANG)
 template <class _Tp, class...>
 using __enable_if_tuple_size_imp = _Tp;
 
 template <class _Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
     const _Tp,
     typename enable_if<!is_volatile<_Tp>::value>::type,
     integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
     : public integral_constant<size_t, tuple_size<_Tp>::value> {};
 
 template <class _Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
     volatile _Tp,
     typename enable_if<!is_const<_Tp>::value>::type,
     integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
     : public integral_constant<size_t, tuple_size<_Tp>::value> {};
 
 template <class _Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
     const volatile _Tp,
     integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
     : public integral_constant<size_t, tuple_size<_Tp>::value> {};
 
 #else
-template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {};
-template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {};
-template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {};
+template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {};
 #endif
 
 template <size_t _Ip, class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_element;
@@ -165,7 +164,7 @@ template <class ..._Tp> class _LIBCPP_TEMPLATE_VIS tuple;
 template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
 
 template <class ..._Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> >
+struct _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> >
     : public integral_constant<size_t, sizeof...(_Tp)>
 {
 };
@@ -291,7 +290,7 @@ public:
 
 
 template <class ..._Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> >
+struct _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> >
     : public integral_constant<size_t, sizeof...(_Tp)>
 {
 };
diff --git a/include/__undef_macros b/include/__undef_macros
index 60ab1dbfb..4923ee6b4 100644
--- a/include/__undef_macros
+++ b/include/__undef_macros
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ __undef_macros ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/algorithm b/include/algorithm
index d102899f2..7da753a49 100644
--- a/include/algorithm
+++ b/include/algorithm
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- algorithm ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1611,6 +1610,18 @@ __unwrap_iter(__wrap_iter<_Tp*> __i)
     return __i.base();
 }
 
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
+typename enable_if
+<
+    is_trivially_copy_assignable<_Tp>::value,
+    const _Tp*
+>::type
+__unwrap_iter(__wrap_iter<const _Tp*> __i)
+{
+    return __i.base();
+}
+
 #else
 
 template <class _Tp>
@@ -2990,7 +3001,7 @@ random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
     {
         _Dp __uid;
         __rs_default __g = __rs_get();
-        for (--__last, --__d; __first < __last; ++__first, --__d)
+        for (--__last, (void) --__d; __first < __last; ++__first, (void) --__d)
         {
             difference_type __i = __uid(__g, _Pp(0, __d));
             if (__i != difference_type(0))
@@ -3012,7 +3023,7 @@ random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last,
     difference_type __d = __last - __first;
     if (__d > 1)
     {
-        for (--__last; __first < __last; ++__first, --__d)
+        for (--__last; __first < __last; ++__first, (void) --__d)
         {
             difference_type __i = __rand(__d);
             if (__i != difference_type(0))
diff --git a/include/any b/include/any
index 781eee786..f3518c34f 100644
--- a/include/any
+++ b/include/any
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ any -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/array b/include/array
index 8f4e111ac..05c4b6527 100644
--- a/include/array
+++ b/include/array
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- array -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -91,7 +90,7 @@ template <class T, size_t N>
 template <class T, size_t N >
   void swap(array<T,N>& x, array<T,N>& y) noexcept(noexcept(x.swap(y))); // C++17
 
-template <class T> class tuple_size;
+template <class T> struct tuple_size;
 template <size_t I, class T> class tuple_element;
 template <class T, size_t N> struct tuple_size<array<T, N>>;
 template <size_t I, class T, size_t N> struct tuple_element<I, array<T, N>>;
@@ -430,7 +429,7 @@ swap(array<_Tp, _Size>& __x, array<_Tp, _Size>& __y)
 }
 
 template <class _Tp, size_t _Size>
-class _LIBCPP_TEMPLATE_VIS tuple_size<array<_Tp, _Size> >
+struct _LIBCPP_TEMPLATE_VIS tuple_size<array<_Tp, _Size> >
     : public integral_constant<size_t, _Size> {};
 
 template <size_t _Ip, class _Tp, size_t _Size>
diff --git a/include/atomic b/include/atomic
index d37e7b4b0..60057f1eb 100644
--- a/include/atomic
+++ b/include/atomic
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- atomic -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/bit b/include/bit
index db3812e5b..a2ca3bc83 100644
--- a/include/bit
+++ b/include/bit
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ bit ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 
diff --git a/include/bitset b/include/bitset
index 6e28596d0..9fb91e9bd 100644
--- a/include/bitset
+++ b/include/bitset
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- bitset ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -991,7 +990,7 @@ inline
 size_t
 bitset<_Size>::count() const _NOEXCEPT
 {
-    return static_cast<size_t>(_VSTD::count(base::__make_iter(0), base::__make_iter(_Size), true));
+    return static_cast<size_t>(__count_bool_true(base::__make_iter(0), _Size));
 }
 
 template <size_t _Size>
diff --git a/include/cassert b/include/cassert
index 377599064..25a0a746b 100644
--- a/include/cassert
+++ b/include/cassert
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- cassert -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ccomplex b/include/ccomplex
index 6ed116445..0d2e0f5a0 100644
--- a/include/ccomplex
+++ b/include/ccomplex
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- ccomplex ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cctype b/include/cctype
index 7fc813446..55fc9ebc6 100644
--- a/include/cctype
+++ b/include/cctype
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- cctype ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cerrno b/include/cerrno
index bab13b8aa..a9268a281 100644
--- a/include/cerrno
+++ b/include/cerrno
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- cerrno ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cfenv b/include/cfenv
index 4fc630419..6cd91db5a 100644
--- a/include/cfenv
+++ b/include/cfenv
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- cfenv -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cfloat b/include/cfloat
index 0abe84bf1..da22c6f60 100644
--- a/include/cfloat
+++ b/include/cfloat
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cfloat -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/charconv b/include/charconv
index 064f2e11c..ec9baa891 100644
--- a/include/charconv
+++ b/include/charconv
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ charconv ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/chrono b/include/chrono
index e99e3c74c..a003751ba 100644
--- a/include/chrono
+++ b/include/chrono
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- chrono ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -808,6 +807,11 @@ constexpr chrono::year                                  operator ""y(unsigned lo
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
 
+#ifndef _LIBCPP_CXX03_LANG
+_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
+struct _FilesystemClock;
+_LIBCPP_END_NAMESPACE_FILESYSTEM
+#endif // !_LIBCPP_CXX03_LANG
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
@@ -1581,9 +1585,26 @@ typedef system_clock high_resolution_clock;
 #endif
 
 #if _LIBCPP_STD_VER > 17
+// [time.clock.file], type file_clock
+using file_clock = _VSTD_FS::_FilesystemClock;
 
-struct _LIBCPP_TYPE_VIS last_spec { explicit last_spec() = default; };
+template<class _Duration>
+using file_time = time_point<file_clock, _Duration>;
+
+
+template <class _Duration>
+using sys_time    = time_point<system_clock, _Duration>;
+using sys_seconds = sys_time<seconds>;
+using sys_days    = sys_time<days>;
 
+struct local_t {};
+template<class Duration>
+using local_time  = time_point<local_t, Duration>;
+using local_seconds = local_time<seconds>;
+using local_days    = local_time<days>;
+
+
+struct _LIBCPP_TYPE_VIS last_spec { explicit last_spec() = default; };
 
 class _LIBCPP_TYPE_VIS day {
 private:
@@ -1728,14 +1749,14 @@ public:
     year() = default;
     explicit inline constexpr year(int __val) noexcept : __y(static_cast<short>(__val)) {}
 
-    inline constexpr year& operator++()    noexcept { ++__y; return *this; };
-    inline constexpr year  operator++(int) noexcept { year __tmp = *this; ++(*this); return __tmp; };
-    inline constexpr year& operator--()    noexcept { --__y; return *this; };
-    inline constexpr year  operator--(int) noexcept { year __tmp = *this; --(*this); return __tmp; };
+    inline constexpr year& operator++()    noexcept { ++__y; return *this; }
+    inline constexpr year  operator++(int) noexcept { year __tmp = *this; ++(*this); return __tmp; }
+    inline constexpr year& operator--()    noexcept { --__y; return *this; }
+    inline constexpr year  operator--(int) noexcept { year __tmp = *this; --(*this); return __tmp; }
            constexpr year& operator+=(const years& __dy) noexcept;
            constexpr year& operator-=(const years& __dy) noexcept;
     inline constexpr year operator+() const noexcept { return *this; }
-    inline constexpr year operator-() const noexcept { return year{-__y}; };
+    inline constexpr year operator-() const noexcept { return year{-__y}; }
 
     inline constexpr bool is_leap() const noexcept { return __y % 4 == 0 && (__y % 100 != 0 || __y % 400 == 0); }
     explicit inline constexpr operator int() const noexcept { return __y; }
@@ -1803,21 +1824,36 @@ private:
     unsigned char __wd;
 public:
   weekday() = default;
-  explicit inline constexpr weekday(unsigned __val) noexcept: __wd(static_cast<unsigned char>(__val)) {}
-//   inline constexpr weekday(const sys_days& dp) noexcept;
-//   explicit constexpr weekday(const local_days& dp) noexcept;
+  inline explicit constexpr weekday(unsigned __val) noexcept : __wd(static_cast<unsigned char>(__val)) {}
+  inline constexpr          weekday(const sys_days& __sysd) noexcept
+          : __wd(__weekday_from_days(__sysd.time_since_epoch().count())) {}
+  inline explicit constexpr weekday(const local_days& __locd) noexcept
+          : __wd(__weekday_from_days(__locd.time_since_epoch().count())) {}
+
   inline constexpr weekday& operator++()    noexcept { __wd = (__wd == 6 ? 0 : __wd + 1); return *this; }
   inline constexpr weekday  operator++(int) noexcept { weekday __tmp = *this; ++(*this); return __tmp; }
   inline constexpr weekday& operator--()    noexcept { __wd = (__wd == 0 ? 6 : __wd - 1); return *this; }
   inline constexpr weekday  operator--(int) noexcept { weekday __tmp = *this; --(*this); return __tmp; }
          constexpr weekday& operator+=(const days& __dd) noexcept;
          constexpr weekday& operator-=(const days& __dd) noexcept;
-  explicit inline constexpr operator unsigned() const noexcept { return __wd; }
+  inline explicit constexpr operator unsigned() const noexcept { return __wd; }
   inline constexpr bool ok() const noexcept { return __wd <= 6; }
-  constexpr weekday_indexed operator[](unsigned __index) const noexcept;
-  constexpr weekday_last    operator[](last_spec) const noexcept;
+         constexpr weekday_indexed operator[](unsigned __index) const noexcept;
+         constexpr weekday_last    operator[](last_spec) const noexcept;
+
+  static constexpr unsigned char __weekday_from_days(int __days) noexcept;
 };
 
+
+// https://howardhinnant.github.io/date_algorithms.html#weekday_from_days
+inline constexpr
+unsigned char weekday::__weekday_from_days(int __days) noexcept
+{
+    return static_cast<unsigned char>(
+              static_cast<unsigned>(__days >= -4 ? (__days+4) % 7 : (__days+5) % 7 + 6)
+           );
+}
+
 inline constexpr
 bool operator==(const weekday& __lhs, const weekday& __rhs) noexcept
 { return static_cast<unsigned>(__lhs) == static_cast<unsigned>(__rhs); }
@@ -2212,6 +2248,7 @@ constexpr year_month operator-(const year_month& __lhs, const months& __rhs) noe
 constexpr year_month operator-(const year_month& __lhs, const years& __rhs) noexcept
 { return __lhs + -__rhs; }
 
+class year_month_day_last;
 
 class _LIBCPP_TYPE_VIS year_month_day {
 private:
@@ -2223,24 +2260,66 @@ public:
      inline constexpr year_month_day(
             const chrono::year& __yval, const chrono::month& __mval, const chrono::day& __dval) noexcept
             : __y{__yval}, __m{__mval}, __d{__dval} {}  
-//   inline constexpr year_month_day(const year_month_day_last& __ymdl) noexcept;
-//   inline constexpr year_month_day(const sys_days& dp) noexcept;
-//   inline explicit constexpr year_month_day(const local_days& dp) noexcept;
+            constexpr year_month_day(const year_month_day_last& __ymdl) noexcept;
+     inline constexpr year_month_day(const sys_days& __sysd) noexcept
+            : year_month_day(__from_days(__sysd.time_since_epoch())) {}
+     inline explicit constexpr year_month_day(const local_days& __locd) noexcept
+            : year_month_day(__from_days(__locd.time_since_epoch())) {}
+
             constexpr year_month_day& operator+=(const months& __dm) noexcept;
             constexpr year_month_day& operator-=(const months& __dm) noexcept;
             constexpr year_month_day& operator+=(const years& __dy)  noexcept;
             constexpr year_month_day& operator-=(const years& __dy)  noexcept;
-     inline constexpr chrono::year  year()  const noexcept { return __y; }
+
+     inline constexpr chrono::year   year() const noexcept { return __y; }
      inline constexpr chrono::month month() const noexcept { return __m; }
-     inline constexpr chrono::day   day()   const noexcept  { return __d; }
-//   inline constexpr operator            sys_days() const noexcept;
-//   inline explicit constexpr operator local_days() const noexcept;
+     inline constexpr chrono::day     day() const noexcept { return __d; }
+     inline constexpr operator   sys_days() const noexcept          { return   sys_days{__to_days()}; }
+     inline explicit constexpr operator local_days() const noexcept { return local_days{__to_days()}; }
 
-//   TODO: This is not quite correct; requires the calendar bits to do right
-//   d_ is in the range [1d, (y_/m_/last).day()],
-     inline constexpr bool ok() const noexcept { return __y.ok() && __m.ok() && __d.ok(); }
+            constexpr bool             ok() const noexcept;
+
+     static constexpr year_month_day __from_days(days __d) noexcept;
+     constexpr days __to_days() const noexcept;
 };
 
+
+// https://howardhinnant.github.io/date_algorithms.html#civil_from_days
+inline constexpr
+year_month_day
+year_month_day::__from_days(days __d) noexcept
+{
+    static_assert(std::numeric_limits<unsigned>::digits >= 18, "");
+    static_assert(std::numeric_limits<int>::digits >= 20     , "");
+    const int      __z = __d.count() + 719468;
+    const int      __era = (__z >= 0 ? __z : __z - 146096) / 146097;
+    const unsigned __doe = static_cast<unsigned>(__z - __era * 146097);              // [0, 146096]
+    const unsigned __yoe = (__doe - __doe/1460 + __doe/36524 - __doe/146096) / 365;  // [0, 399]
+    const int      __yr = static_cast<int>(__yoe) + __era * 400;
+    const unsigned __doy = __doe - (365 * __yoe + __yoe/4 - __yoe/100);              // [0, 365]
+    const unsigned __mp = (5 * __doy + 2)/153;                                       // [0, 11]
+    const unsigned __dy = __doy - (153 * __mp + 2)/5 + 1;                            // [1, 31]
+    const unsigned __mth = __mp + (__mp < 10 ? 3 : -9);                              // [1, 12]
+    return year_month_day{chrono::year{__yr + (__mth <= 2)}, chrono::month{__mth}, chrono::day{__dy}};
+}
+
+// https://howardhinnant.github.io/date_algorithms.html#days_from_civil
+inline constexpr days year_month_day::__to_days() const noexcept
+{
+    static_assert(std::numeric_limits<unsigned>::digits >= 18, "");
+    static_assert(std::numeric_limits<int>::digits >= 20     , "");
+
+    const int      __yr  = static_cast<int>(__y) - (__m <= February);
+    const unsigned __mth = static_cast<unsigned>(__m);
+    const unsigned __dy  = static_cast<unsigned>(__d);
+
+    const int      __era = (__yr >= 0 ? __yr : __yr - 399) / 400;
+    const unsigned __yoe = static_cast<unsigned>(__yr - __era * 400);                // [0, 399]
+    const unsigned __doy = (153 * (__mth + (__mth > 2 ? -3 : 9)) + 2) / 5 + __dy-1;  // [0, 365]
+    const unsigned __doe = __yoe * 365 + __yoe/4 - __yoe/100 + __doy;                // [0, 146096]
+    return days{__era * 146097 + static_cast<int>(__doe) - 719468};
+}
+
 inline constexpr
 bool operator==(const year_month_day& __lhs, const year_month_day& __rhs) noexcept
 { return __lhs.year() == __rhs.year() && __lhs.month() == __rhs.month() && __lhs.day() == __rhs.day(); }
@@ -2338,16 +2417,30 @@ public:
      constexpr year_month_day_last& operator+=(const years& __y)  noexcept;
      constexpr year_month_day_last& operator-=(const years& __y)  noexcept;
 
-     constexpr chrono::year           year()           const noexcept { return __y; }
-     constexpr chrono::month          month()          const noexcept { return __mdl.month(); }
-     constexpr chrono::month_day_last month_day_last() const noexcept { return __mdl; }
-//   constexpr chrono::day            day()            const noexcept;
-//   constexpr          operator sys_days()   const noexcept;
-//   explicit constexpr operator local_days() const noexcept;
-     constexpr bool ok() const noexcept { return __y.ok() && __mdl.ok(); }
+     inline constexpr chrono::year                     year() const noexcept { return __y; }
+     inline constexpr chrono::month                   month() const noexcept { return __mdl.month(); }
+     inline constexpr chrono::month_day_last month_day_last() const noexcept { return __mdl; }
+            constexpr chrono::day                       day() const noexcept;
+     inline constexpr operator                     sys_days() const noexcept { return   sys_days{year()/month()/day()}; }
+     inline explicit constexpr operator          local_days() const noexcept { return local_days{year()/month()/day()}; }
+     inline constexpr bool                               ok() const noexcept { return __y.ok() && __mdl.ok(); }
 };
 
 inline constexpr
+chrono::day year_month_day_last::day() const noexcept
+{
+    constexpr chrono::day __d[] =
+    {
+        chrono::day(31), chrono::day(28), chrono::day(31),
+        chrono::day(30), chrono::day(31), chrono::day(30),
+        chrono::day(31), chrono::day(31), chrono::day(30),
+        chrono::day(31), chrono::day(30), chrono::day(31)
+    };
+    return month() != February || !__y.is_leap() ?
+        __d[static_cast<unsigned>(month()) - 1] : chrono::day{29};
+}
+
+inline constexpr
 bool operator==(const year_month_day_last& __lhs, const year_month_day_last& __rhs) noexcept
 { return __lhs.year() == __rhs.year() && __lhs.month_day_last() == __rhs.month_day_last(); }
 
@@ -2420,6 +2513,15 @@ inline constexpr year_month_day_last& year_month_day_last::operator-=(const mont
 inline constexpr year_month_day_last& year_month_day_last::operator+=(const years& __dy)  noexcept { *this = *this + __dy; return *this; }
 inline constexpr year_month_day_last& year_month_day_last::operator-=(const years& __dy)  noexcept { *this = *this - __dy; return *this; }
 
+inline constexpr year_month_day::year_month_day(const year_month_day_last& __ymdl) noexcept
+    : __y{__ymdl.year()}, __m{__ymdl.month()}, __d{__ymdl.day()} {}  
+
+inline constexpr bool year_month_day::ok() const noexcept
+{
+    if (!__y.ok() || !__m.ok()) return false;
+    return chrono::day{1} <= __d && __d <= (__y / __m / last).day();
+}
+
 class _LIBCPP_TYPE_VIS year_month_weekday {
     chrono::year            __y;
     chrono::month           __m;
@@ -2429,8 +2531,10 @@ public:
     constexpr year_month_weekday(const chrono::year& __yval, const chrono::month& __mval,
                                const chrono::weekday_indexed& __wdival) noexcept
         : __y{__yval}, __m{__mval}, __wdi{__wdival} {}
-//  constexpr year_month_weekday(const sys_days& dp) noexcept;
-//  explicit constexpr year_month_weekday(const local_days& dp) noexcept;
+    constexpr year_month_weekday(const sys_days& __sysd) noexcept
+            : year_month_weekday(__from_days(__sysd.time_since_epoch())) {}
+    inline explicit constexpr year_month_weekday(const local_days& __locd) noexcept
+            : year_month_weekday(__from_days(__locd.time_since_epoch())) {}
     constexpr year_month_weekday& operator+=(const months& m) noexcept;
     constexpr year_month_weekday& operator-=(const months& m) noexcept;
     constexpr year_month_weekday& operator+=(const years& y)  noexcept;
@@ -2442,17 +2546,38 @@ public:
     inline constexpr unsigned                          index() const noexcept { return __wdi.index(); }
     inline constexpr chrono::weekday_indexed weekday_indexed() const noexcept { return __wdi; }
 
-//  constexpr          operator sys_days()   const noexcept;
-//  explicit constexpr operator local_days() const noexcept;
+    inline constexpr                       operator sys_days() const noexcept { return   sys_days{__to_days()}; }
+    inline explicit constexpr operator            local_days() const noexcept { return local_days{__to_days()}; }
     inline constexpr bool ok() const noexcept
     {
         if (!__y.ok() || !__m.ok() || !__wdi.ok()) return false;
     //  TODO: make sure it's a valid date
         return true;
     }
+
+    static constexpr year_month_weekday __from_days(days __d) noexcept;
+    constexpr days __to_days() const noexcept;
 };
 
 inline constexpr
+year_month_weekday year_month_weekday::__from_days(days __d) noexcept
+{
+    const sys_days      __sysd{__d};
+    const chrono::weekday __wd = chrono::weekday(__sysd);
+    const year_month_day __ymd = year_month_day(__sysd);
+    return year_month_weekday{__ymd.year(), __ymd.month(), 
+                              __wd[(static_cast<unsigned>(__ymd.day())-1)/7+1]};
+}
+
+inline constexpr
+days year_month_weekday::__to_days() const noexcept
+{
+    const sys_days __sysd = sys_days(__y/__m/1);
+    return (__sysd + (__wdi.weekday() - chrono::weekday(__sysd) + days{(__wdi.index()-1)*7}))
+                .time_since_epoch();
+}
+
+inline constexpr
 bool operator==(const year_month_weekday& __lhs, const year_month_weekday& __rhs) noexcept
 { return __lhs.year() == __rhs.year() && __lhs.month() == __rhs.month() && __lhs.weekday_indexed() == __rhs.weekday_indexed(); }
 
@@ -2529,12 +2654,23 @@ public:
     inline constexpr chrono::month               month() const noexcept { return __m; }
     inline constexpr chrono::weekday           weekday() const noexcept { return __wdl.weekday(); }
     inline constexpr chrono::weekday_last weekday_last() const noexcept { return __wdl; }
-//  constexpr          operator sys_days()   const noexcept;
-//  explicit constexpr operator local_days() const noexcept;
+    inline constexpr operator                 sys_days() const noexcept { return   sys_days{__to_days()}; }
+    inline explicit constexpr operator      local_days() const noexcept { return local_days{__to_days()}; }
     inline constexpr bool ok() const noexcept { return __y.ok() && __m.ok() && __wdl.ok(); }
+    
+    constexpr days __to_days() const noexcept;
+    
 };
 
 inline constexpr
+days year_month_weekday_last::__to_days() const noexcept
+{
+    const sys_days __last = sys_days{__y/__m/last};
+    return (__last - (chrono::weekday{__last} - __wdl.weekday())).time_since_epoch();
+
+}
+
+inline constexpr
 bool operator==(const year_month_weekday_last& __lhs, const year_month_weekday_last& __rhs) noexcept
 { return __lhs.year() == __rhs.year() && __lhs.month() == __rhs.month() && __lhs.weekday_last() == __rhs.weekday_last(); }
 
@@ -2689,6 +2825,40 @@ namespace chrono { // hoist the literals into namespace std::chrono
 
 _LIBCPP_END_NAMESPACE_STD
 
+#ifndef _LIBCPP_CXX03_LANG
+_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
+struct _FilesystemClock {
+#if !defined(_LIBCPP_HAS_NO_INT128)
+  typedef __int128_t rep;
+  typedef nano period;
+#else
+  typedef long long rep;
+  typedef nano period;
+#endif
+
+  typedef chrono::duration<rep, period> duration;
+  typedef chrono::time_point<_FilesystemClock> time_point;
+
+  static _LIBCPP_CONSTEXPR_AFTER_CXX11 const bool is_steady = false;
+
+  _LIBCPP_FUNC_VIS static time_point now() noexcept;
+
+  _LIBCPP_INLINE_VISIBILITY
+  static time_t to_time_t(const time_point& __t) noexcept {
+      typedef chrono::duration<rep> __secs;
+      return time_t(
+          chrono::duration_cast<__secs>(__t.time_since_epoch()).count());
+  }
+
+  _LIBCPP_INLINE_VISIBILITY
+  static time_point from_time_t(time_t __t) noexcept {
+      typedef chrono::duration<rep> __secs;
+      return time_point(__secs(__t));
+  }
+};
+_LIBCPP_END_NAMESPACE_FILESYSTEM
+#endif // !_LIBCPP_CXX03_LANG
+
 _LIBCPP_POP_MACROS
 
 #endif  // _LIBCPP_CHRONO
diff --git a/include/cinttypes b/include/cinttypes
index 3f61b0634..55af85cc3 100644
--- a/include/cinttypes
+++ b/include/cinttypes
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cinttypes --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ciso646 b/include/ciso646
index b2efc72a9..172f1676a 100644
--- a/include/ciso646
+++ b/include/ciso646
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- ciso646 ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/climits b/include/climits
index 81ffecdf6..43eb2d3f1 100644
--- a/include/climits
+++ b/include/climits
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- climits ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/clocale b/include/clocale
index 05fa9c6ed..bff4e92f9 100644
--- a/include/clocale
+++ b/include/clocale
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- clocale ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cmath b/include/cmath
index f5f62adcf..3af9f5481 100644
--- a/include/cmath
+++ b/include/cmath
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- cmath -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/codecvt b/include/codecvt
index 5eb9d1549..5ea411ea7 100644
--- a/include/codecvt
+++ b/include/codecvt
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- codecvt -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/compare b/include/compare
index 07f88f09c..e05257beb 100644
--- a/include/compare
+++ b/include/compare
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- compare -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/complex b/include/complex
index 8cf6a946d..ff702b4ff 100644
--- a/include/complex
+++ b/include/complex
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- complex ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/complex.h b/include/complex.h
index c2359665a..b78733b80 100644
--- a/include/complex.h
+++ b/include/complex.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- complex.h --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/condition_variable b/include/condition_variable
index c45a326d8..8c733448e 100644
--- a/include/condition_variable
+++ b/include/condition_variable
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------- condition_variable ----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/csetjmp b/include/csetjmp
index 58a9c73ab..ed94b50d1 100644
--- a/include/csetjmp
+++ b/include/csetjmp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- csetjmp ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/csignal b/include/csignal
index 972826618..99abd02de 100644
--- a/include/csignal
+++ b/include/csignal
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- csignal ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cstdarg b/include/cstdarg
index c8b699924..e8147d496 100644
--- a/include/cstdarg
+++ b/include/cstdarg
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cstdarg ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cstdbool b/include/cstdbool
index 2c764a61f..fad471414 100644
--- a/include/cstdbool
+++ b/include/cstdbool
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cstdbool ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cstddef b/include/cstddef
index b4c42b19d..bd62d6db3 100644
--- a/include/cstddef
+++ b/include/cstddef
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cstddef ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cstdint b/include/cstdint
index 7a187d3eb..f72fa0673 100644
--- a/include/cstdint
+++ b/include/cstdint
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cstdint ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cstdio b/include/cstdio
index 00b989fad..675569382 100644
--- a/include/cstdio
+++ b/include/cstdio
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- cstdio ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cstdlib b/include/cstdlib
index 00c604e67..68b3ded3f 100644
--- a/include/cstdlib
+++ b/include/cstdlib
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cstdlib ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cstring b/include/cstring
index d550695ca..8bc96a023 100644
--- a/include/cstring
+++ b/include/cstring
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cstring ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ctgmath b/include/ctgmath
index 535eb7dcc..ba1eeeac9 100644
--- a/include/ctgmath
+++ b/include/ctgmath
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- ctgmath -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ctime b/include/ctime
index 8264fe33b..cb8474f8f 100644
--- a/include/ctime
+++ b/include/ctime
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- ctime -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ctype.h b/include/ctype.h
index e97ff3c48..dcc7935a2 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- ctype.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cwchar b/include/cwchar
index d268e8bbd..451c621f9 100644
--- a/include/cwchar
+++ b/include/cwchar
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cwchar -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/cwctype b/include/cwctype
index 25b2489ed..575fd5661 100644
--- a/include/cwctype
+++ b/include/cwctype
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- cwctype ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/deque b/include/deque
index 6f7d04be5..60a1130b2 100644
--- a/include/deque
+++ b/include/deque
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- deque -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/errno.h b/include/errno.h
index ee6429110..447319eff 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- errno.h -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/exception b/include/exception
index fdd83d10c..63d8ad229 100644
--- a/include/exception
+++ b/include/exception
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- exception ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/__config b/include/experimental/__config
index c6f177620..d3667b524 100644
--- a/include/experimental/__config
+++ b/include/experimental/__config
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- __config ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/__memory b/include/experimental/__memory
index 229fea605..4cf897846 100644
--- a/include/experimental/__memory
+++ b/include/experimental/__memory
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/algorithm b/include/experimental/algorithm
index eb3bad6ef..79fd7b1b2 100644
--- a/include/experimental/algorithm
+++ b/include/experimental/algorithm
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- algorithm ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/any b/include/experimental/any
index 1dcdd0f25..c8050e330 100644
--- a/include/experimental/any
+++ b/include/experimental/any
@@ -1,11 +1,20 @@
 // -*- C++ -*-
-//===------------------------------ any -----------------------------------===//
+//===------------------------------- any ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_ANY
+#define _LIBCPP_EXPERIMENTAL_ANY
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/any> has been removed. Use <any> instead.")
+#else
+# warning "<experimental/any> has been removed. Use <any> instead."
+#endif
 
-#error "<experimental/any> has been removed. Use <any> instead."
+#endif // _LIBCPP_EXPERIMENTAL_ANY
diff --git a/include/experimental/chrono b/include/experimental/chrono
index 591cf7160..f3ceaaea9 100644
--- a/include/experimental/chrono
+++ b/include/experimental/chrono
@@ -1,11 +1,20 @@
 // -*- C++ -*-
-//===------------------------------ chrono ---------------------------------===//
+//===---------------------------- chrono ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_CHRONO
+#define _LIBCPP_EXPERIMENTAL_CHRONO
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/chrono> has been removed. Use <chrono> instead.")
+#else
+# warning "<experimental/chrono> has been removed. Use <chrono> instead."
+#endif
 
-#error "<experimental/chrono> has been removed. Use <chrono> instead."
+#endif // _LIBCPP_EXPERIMENTAL_CHRONO
diff --git a/include/experimental/coroutine b/include/experimental/coroutine
index 1eb224a53..13e326250 100644
--- a/include/experimental/coroutine
+++ b/include/experimental/coroutine
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------- coroutine -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -214,7 +213,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY
     _Promise& promise() const {
         return *static_cast<_Promise*>(
-            __builtin_coro_promise(this->__handle_, __alignof(_Promise), false));
+            __builtin_coro_promise(this->__handle_, _LIBCPP_ALIGNOF(_Promise), false));
     }
 
 public:
@@ -254,7 +253,7 @@ public:
         coroutine_handle __tmp;
         __tmp.__handle_ = __builtin_coro_promise(
             _VSTD::addressof(const_cast<_RawPromise&>(__promise)),
-             __alignof(_Promise), true);
+             _LIBCPP_ALIGNOF(_Promise), true);
         return __tmp;
     }
 };
@@ -272,7 +271,7 @@ public:
   _LIBCPP_INLINE_VISIBILITY
   _Promise& promise() const {
     return *static_cast<_Promise*>(
-      __builtin_coro_promise(this->__handle_, __alignof(_Promise), false));
+      __builtin_coro_promise(this->__handle_, _LIBCPP_ALIGNOF(_Promise), false));
   }
 
   _LIBCPP_CONSTEXPR explicit operator bool() const _NOEXCEPT { return true; }
diff --git a/include/experimental/deque b/include/experimental/deque
index f8495743c..73c2787c7 100644
--- a/include/experimental/deque
+++ b/include/experimental/deque
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- deque ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/filesystem b/include/experimental/filesystem
index 28d8dcf4f..d2e6237df 100644
--- a/include/experimental/filesystem
+++ b/include/experimental/filesystem
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- filesystem -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef _LIBCPP_EXPERIMENTAL_FILESYSTEM
diff --git a/include/experimental/forward_list b/include/experimental/forward_list
index 55e195f44..93f6debe9 100644
--- a/include/experimental/forward_list
+++ b/include/experimental/forward_list
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- forward_list -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/functional b/include/experimental/functional
index f63dfb07b..8c55f4f55 100644
--- a/include/experimental/functional
+++ b/include/experimental/functional
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- functional --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/iterator b/include/experimental/iterator
index ea672e966..6a6e51d82 100644
--- a/include/experimental/iterator
+++ b/include/experimental/iterator
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------- iterator -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/list b/include/experimental/list
index 1678ee3e9..adc64a8b5 100644
--- a/include/experimental/list
+++ b/include/experimental/list
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- list ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/map b/include/experimental/map
index cff2c5e52..965d7582c 100644
--- a/include/experimental/map
+++ b/include/experimental/map
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------- map ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/memory_resource b/include/experimental/memory_resource
index 221ce5b8e..f999fb9be 100644
--- a/include/experimental/memory_resource
+++ b/include/experimental/memory_resource
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ memory_resource -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -98,7 +97,7 @@ size_t __aligned_allocation_size(size_t __s, size_t __a) _NOEXCEPT
 // 8.5, memory.resource
 class _LIBCPP_TYPE_VIS memory_resource
 {
-    static const size_t __max_align = alignof(max_align_t);
+    static const size_t __max_align = _LIBCPP_ALIGNOF(max_align_t);
 
 // 8.5.2, memory.resource.public
 public:
@@ -190,7 +189,7 @@ public:
                 " 'n' exceeds maximum supported size");
         }
         return static_cast<_ValueType*>(
-            __res_->allocate(__n * sizeof(_ValueType), alignof(_ValueType))
+            __res_->allocate(__n * sizeof(_ValueType), _LIBCPP_ALIGNOF(_ValueType))
         );
     }
 
@@ -198,7 +197,7 @@ public:
     void deallocate(_ValueType * __p, size_t __n) _NOEXCEPT {
         _LIBCPP_ASSERT(__n <= __max_size(),
                        "deallocate called for size which exceeds max_size()");
-        __res_->deallocate(__p, __n * sizeof(_ValueType), alignof(_ValueType));
+        __res_->deallocate(__p, __n * sizeof(_ValueType), _LIBCPP_ALIGNOF(_ValueType));
     }
 
     template <class _Tp, class ..._Ts>
@@ -345,7 +344,7 @@ class _LIBCPP_TEMPLATE_VIS __resource_adaptor_imp
                && is_same<typename _CTraits::pointer, char*>::value
                && is_same<typename _CTraits::void_pointer, void*>::value, "");
 
-    static const size_t _MaxAlign = alignof(max_align_t);
+    static const size_t _MaxAlign = _LIBCPP_ALIGNOF(max_align_t);
 
     using _Alloc = typename _CTraits::template rebind_alloc<
             typename aligned_storage<_MaxAlign, _MaxAlign>::type
diff --git a/include/experimental/numeric b/include/experimental/numeric
index 14a664011..4ea1306bf 100644
--- a/include/experimental/numeric
+++ b/include/experimental/numeric
@@ -1,11 +1,20 @@
 // -*- C++ -*-
 //===--------------------------- numeric ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_NUMERIC
+#define _LIBCPP_EXPERIMENTAL_NUMERIC
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/numeric> has been removed. Use <numeric> instead.")
+#else
+# warning "<experimental/numeric> has been removed. Use <numeric> instead."
+#endif
 
-#error "<experimental/numeric> has been removed. Use <numeric> instead."
+#endif // _LIBCPP_EXPERIMENTAL_NUMERIC
diff --git a/include/experimental/optional b/include/experimental/optional
index d68cefdf6..1749cd6a6 100644
--- a/include/experimental/optional
+++ b/include/experimental/optional
@@ -1,11 +1,20 @@
 // -*- C++ -*-
 //===-------------------------- optional ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_OPTIONAL
+#define _LIBCPP_EXPERIMENTAL_OPTIONAL
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/optional> has been removed. Use <optional> instead.")
+#else
+# warning "<experimental/optional> has been removed. Use <optional> instead."
+#endif
 
-#error "<experimental/optional> has been removed. Use <optional> instead."
+#endif // _LIBCPP_EXPERIMENTAL_OPTIONAL
diff --git a/include/experimental/propagate_const b/include/experimental/propagate_const
index 188548596..092b013bb 100644
--- a/include/experimental/propagate_const
+++ b/include/experimental/propagate_const
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ propagate_const -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/ratio b/include/experimental/ratio
index 9c2bf2e46..4cd4fa005 100644
--- a/include/experimental/ratio
+++ b/include/experimental/ratio
@@ -1,11 +1,20 @@
 // -*- C++ -*-
-//===------------------------------ ratio ---------------------------------===//
+//===----------------------------- ratio ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_RATIO
+#define _LIBCPP_EXPERIMENTAL_RATIO
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/ratio> has been removed. Use <ratio> instead.")
+#else
+# warning "<experimental/ratio> has been removed. Use <ratio> instead."
+#endif
 
-#error "<experimental/ratio> has been removed. Use <ratio> instead."
+#endif // _LIBCPP_EXPERIMENTAL_RATIO
diff --git a/include/experimental/regex b/include/experimental/regex
index d38891c37..17193cf2f 100644
--- a/include/experimental/regex
+++ b/include/experimental/regex
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------- regex ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/set b/include/experimental/set
index 20cf6d4a3..52f4df384 100644
--- a/include/experimental/set
+++ b/include/experimental/set
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- list ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/simd b/include/experimental/simd
index 6580443f7..39ac35e4e 100644
--- a/include/experimental/simd
+++ b/include/experimental/simd
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------- simd ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef _LIBCPP_EXPERIMENTAL_SIMD
diff --git a/include/experimental/string b/include/experimental/string
index 8b8545128..264ff9236 100644
--- a/include/experimental/string
+++ b/include/experimental/string
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- string ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/string_view b/include/experimental/string_view
index f13bff54d..4b59e6d01 100644
--- a/include/experimental/string_view
+++ b/include/experimental/string_view
@@ -1,11 +1,20 @@
 // -*- C++ -*-
 //===------------------------ string_view ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_STRING_VIEW
+#define _LIBCPP_EXPERIMENTAL_STRING_VIEW
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/string_view> has been removed. Use <string_view> instead.")
+#else
+# warning "<experimental/string_view> has been removed. Use <string_view> instead."
+#endif
 
-#error "<experimental/string_view> has been removed. Use <string_view> instead."
+#endif // _LIBCPP_EXPERIMENTAL_STRING_VIEW
diff --git a/include/experimental/system_error b/include/experimental/system_error
index 7937357fa..094e6d365 100644
--- a/include/experimental/system_error
+++ b/include/experimental/system_error
@@ -1,11 +1,20 @@
 // -*- C++ -*-
 //===-------------------------- system_error ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR
+#define _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/system_error> has been removed. Use <system_error> instead.")
+#else
+# warning "<experimental/system_error> has been removed. Use <system_error> instead."
+#endif
 
-#error "<experimental/system_error> has been removed. Use <system_error> instead."
+#endif // _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR
diff --git a/include/experimental/tuple b/include/experimental/tuple
index 1f37a6293..827ef37ae 100644
--- a/include/experimental/tuple
+++ b/include/experimental/tuple
@@ -1,11 +1,20 @@
 // -*- C++ -*-
 //===----------------------------- tuple ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_TUPLE
+#define _LIBCPP_EXPERIMENTAL_TUPLE
+
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/tuple> has been removed. Use <tuple> instead.")
+#else
+# warning "<experimental/tuple> has been removed. Use <tuple> instead."
+#endif
 
-#error "<experimental/tuple> has been removed. Use <tuple> instead."
+#endif // _LIBCPP_EXPERIMENTAL_TUPLE
diff --git a/include/experimental/type_traits b/include/experimental/type_traits
index afe491567..3127c0ea9 100644
--- a/include/experimental/type_traits
+++ b/include/experimental/type_traits
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- type_traits -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/unordered_map b/include/experimental/unordered_map
index 1f998c2d4..eca9cea79 100644
--- a/include/experimental/unordered_map
+++ b/include/experimental/unordered_map
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- unordered_map ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/unordered_set b/include/experimental/unordered_set
index d00a83753..323868f78 100644
--- a/include/experimental/unordered_set
+++ b/include/experimental/unordered_set
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- unordered_set ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/utility b/include/experimental/utility
index 8effa71c1..0bca0f7c9 100644
--- a/include/experimental/utility
+++ b/include/experimental/utility
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- utility ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/experimental/vector b/include/experimental/vector
index bd10492bf..9b8101206 100644
--- a/include/experimental/vector
+++ b/include/experimental/vector
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- vector ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ext/__hash b/include/ext/__hash
index 318cb1f97..98a954483 100644
--- a/include/ext/__hash
+++ b/include/ext/__hash
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- hash_set ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ext/hash_map b/include/ext/hash_map
index 998e8f659..d06a9e36a 100644
--- a/include/ext/hash_map
+++ b/include/ext/hash_map
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- hash_map ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ext/hash_set b/include/ext/hash_set
index 38f81ed3b..21e66877c 100644
--- a/include/ext/hash_set
+++ b/include/ext/hash_set
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- hash_set ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/fenv.h b/include/fenv.h
new file mode 100644
index 000000000..7cede4b34
--- /dev/null
+++ b/include/fenv.h
@@ -0,0 +1,115 @@
+// -*- C++ -*-
+//===---------------------------- math.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_FENV_H
+#define _LIBCPP_FENV_H
+
+
+/*
+    fenv.h synopsis
+
+This entire header is C99 / C++0X
+
+Macros:
+
+    FE_DIVBYZERO
+    FE_INEXACT
+    FE_INVALID
+    FE_OVERFLOW
+    FE_UNDERFLOW
+    FE_ALL_EXCEPT
+    FE_DOWNWARD
+    FE_TONEAREST
+    FE_TOWARDZERO
+    FE_UPWARD
+    FE_DFL_ENV
+
+Types:
+
+    fenv_t
+    fexcept_t
+
+int feclearexcept(int excepts);
+int fegetexceptflag(fexcept_t* flagp, int excepts);
+int feraiseexcept(int excepts);
+int fesetexceptflag(const fexcept_t* flagp, int excepts);
+int fetestexcept(int excepts);
+int fegetround();
+int fesetround(int round);
+int fegetenv(fenv_t* envp);
+int feholdexcept(fenv_t* envp);
+int fesetenv(const fenv_t* envp);
+int feupdateenv(const fenv_t* envp);
+
+
+*/
+
+#include <__config>
+#include_next <fenv.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#ifdef __cplusplus
+
+extern "C++" {
+
+#ifdef feclearexcept
+#undef feclearexcept
+#endif
+
+#ifdef fegetexceptflag
+#undef fegetexceptflag
+#endif
+
+
+#ifdef feraiseexcept
+#undef feraiseexcept
+#endif
+
+#ifdef fesetexceptflag
+#undef fesetexceptflag
+#endif
+
+
+#ifdef fetestexcept
+#undef fetestexcept
+#endif
+
+#ifdef fegetround
+#undef fegetround
+#endif
+
+#ifdef fesetround
+#undef fesetround
+#endif
+
+#ifdef fegetenv
+#undef fegetenv
+#endif
+
+#ifdef feholdexcept
+#undef feholdexcept
+#endif
+
+
+#ifdef fesetenv
+#undef fesetenv
+#endif
+
+#ifdef feupdateenv
+#undef feupdateenv
+#endif
+
+} // extern "C++"
+
+#endif // defined(__cplusplus)
+
+#endif // _LIBCPP_FENV_H
diff --git a/include/filesystem b/include/filesystem
index 339bb252f..7a151d988 100644
--- a/include/filesystem
+++ b/include/filesystem
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- filesystem -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef _LIBCPP_FILESYSTEM
@@ -259,36 +258,6 @@ _LIBCPP_PUSH_MACROS
 
 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
 
-struct _FilesystemClock {
-#if !defined(_LIBCPP_HAS_NO_INT128)
-  typedef __int128_t rep;
-  typedef nano period;
-#else
-  typedef long long rep;
-  typedef nano period;
-#endif
-
-  typedef chrono::duration<rep, period> duration;
-  typedef chrono::time_point<_FilesystemClock> time_point;
-
-  static _LIBCPP_CONSTEXPR_AFTER_CXX11 const bool is_steady = false;
-
-  _LIBCPP_FUNC_VIS static time_point now() noexcept;
-
-  _LIBCPP_INLINE_VISIBILITY
-  static time_t to_time_t(const time_point& __t) noexcept {
-    typedef chrono::duration<rep> __secs;
-    return time_t(
-        chrono::duration_cast<__secs>(__t.time_since_epoch()).count());
-  }
-
-  _LIBCPP_INLINE_VISIBILITY
-  static time_point from_time_t(time_t __t) noexcept {
-    typedef chrono::duration<rep> __secs;
-    return time_point(__secs(__t));
-  }
-};
-
 typedef chrono::time_point<_FilesystemClock> file_time_type;
 
 struct _LIBCPP_TYPE_VIS space_info {
@@ -1181,6 +1150,31 @@ public:
     return __is;
   }
 
+  friend _LIBCPP_INLINE_VISIBILITY bool operator==(const path& __lhs, const path& __rhs) noexcept {
+    return __lhs.compare(__rhs) == 0;
+  }
+  friend _LIBCPP_INLINE_VISIBILITY bool operator!=(const path& __lhs, const path& __rhs) noexcept {
+    return __lhs.compare(__rhs) != 0;
+  }
+  friend _LIBCPP_INLINE_VISIBILITY bool operator<(const path& __lhs, const path& __rhs) noexcept {
+    return __lhs.compare(__rhs) < 0;
+  }
+  friend _LIBCPP_INLINE_VISIBILITY bool operator<=(const path& __lhs, const path& __rhs) noexcept {
+    return __lhs.compare(__rhs) <= 0;
+  }
+  friend _LIBCPP_INLINE_VISIBILITY bool operator>(const path& __lhs, const path& __rhs) noexcept {
+    return __lhs.compare(__rhs) > 0;
+  }
+  friend _LIBCPP_INLINE_VISIBILITY bool operator>=(const path& __lhs, const path& __rhs) noexcept {
+    return __lhs.compare(__rhs) >= 0;
+  }
+
+  friend _LIBCPP_INLINE_VISIBILITY path operator/(const path& __lhs,
+                                                  const path& __rhs) {
+    path __result(__lhs);
+    __result /= __rhs;
+    return __result;
+  }
 private:
   inline _LIBCPP_INLINE_VISIBILITY path&
   __assign_view(__string_view const& __s) noexcept {
@@ -1197,43 +1191,6 @@ inline _LIBCPP_INLINE_VISIBILITY void swap(path& __lhs, path& __rhs) noexcept {
 _LIBCPP_FUNC_VIS
 size_t hash_value(const path& __p) noexcept;
 
-inline _LIBCPP_INLINE_VISIBILITY bool operator==(const path& __lhs,
-                                                 const path& __rhs) noexcept {
-  return __lhs.compare(__rhs) == 0;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY bool operator!=(const path& __lhs,
-                                                 const path& __rhs) noexcept {
-  return __lhs.compare(__rhs) != 0;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY bool operator<(const path& __lhs,
-                                                const path& __rhs) noexcept {
-  return __lhs.compare(__rhs) < 0;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY bool operator<=(const path& __lhs,
-                                                 const path& __rhs) noexcept {
-  return __lhs.compare(__rhs) <= 0;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY bool operator>(const path& __lhs,
-                                                const path& __rhs) noexcept {
-  return __lhs.compare(__rhs) > 0;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY bool operator>=(const path& __lhs,
-                                                 const path& __rhs) noexcept {
-  return __lhs.compare(__rhs) >= 0;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY path operator/(const path& __lhs,
-                                                const path& __rhs) {
-  path __result(__lhs);
-  __result /= __rhs;
-  return __result;
-}
-
 template <class _Source>
 _LIBCPP_INLINE_VISIBILITY
     typename enable_if<__is_pathable<_Source>::value, path>::type
@@ -1390,7 +1347,6 @@ public:
     return __storage_->__what_.c_str();
   }
 
-  _LIBCPP_FUNC_VIS
   void __create_what(int __num_paths);
 
 private:
@@ -1408,13 +1364,11 @@ private:
 template <class... _Args>
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 #ifndef _LIBCPP_NO_EXCEPTIONS
-    void
-    __throw_filesystem_error(_Args&&... __args) {
+void __throw_filesystem_error(_Args&&... __args) {
   throw filesystem_error(std::forward<_Args>(__args)...);
 }
 #else
-    void
-    __throw_filesystem_error(_Args&&...) {
+void __throw_filesystem_error(_Args&&...) {
   _VSTD::abort();
 }
 #endif
diff --git a/include/float.h b/include/float.h
index 759ac8e79..5c1e1db79 100644
--- a/include/float.h
+++ b/include/float.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- float.h ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/forward_list b/include/forward_list
index b506acd1f..bbea71ee1 100644
--- a/include/forward_list
+++ b/include/forward_list
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------- forward_list ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/fstream b/include/fstream
index 332b4747c..1902ce9af 100644
--- a/include/fstream
+++ b/include/fstream
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- fstream ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -702,6 +701,7 @@ basic_filebuf<_CharT, _Traits>::close()
             __file_ = 0;
         else
             __rt = 0;
+        setbuf(0, 0);
     }
     return __rt;
 }
diff --git a/include/functional b/include/functional
index 1fb44f271..def8a75f6 100644
--- a/include/functional
+++ b/include/functional
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ functional ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1489,8 +1488,9 @@ class __alloc_func<_Fp, _Ap, _Rp(_ArgTypes...)>
     _LIBCPP_INLINE_VISIBILITY
     const _Target& __target() const { return __f_.first(); }
 
+    // WIN32 APIs may define __allocator, so use __get_allocator instead.
     _LIBCPP_INLINE_VISIBILITY
-    const _Alloc& __allocator() const { return __f_.second(); }
+    const _Alloc& __get_allocator() const { return __f_.second(); }
 
     _LIBCPP_INLINE_VISIBILITY
     explicit __alloc_func(_Target&& __f)
@@ -1612,7 +1612,7 @@ __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::__clone() const
 {
     typedef allocator_traits<_Alloc> __alloc_traits;
     typedef typename __rebind_alloc_helper<__alloc_traits, __func>::type _Ap;
-    _Ap __a(__f_.__allocator());
+    _Ap __a(__f_.__get_allocator());
     typedef __allocator_destructor<_Ap> _Dp;
     unique_ptr<__func, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
     ::new ((void*)__hold.get()) __func(__f_.__target(), _Alloc(__a));
@@ -1623,7 +1623,7 @@ template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
 void
 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::__clone(__base<_Rp(_ArgTypes...)>* __p) const
 {
-    ::new (__p) __func(__f_.__target(), __f_.__allocator());
+    ::new (__p) __func(__f_.__target(), __f_.__get_allocator());
 }
 
 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
@@ -1639,7 +1639,7 @@ __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::destroy_deallocate() _NOEXCEPT
 {
     typedef allocator_traits<_Alloc> __alloc_traits;
     typedef typename __rebind_alloc_helper<__alloc_traits, __func>::type _Ap;
-    _Ap __a(__f_.__allocator());
+    _Ap __a(__f_.__get_allocator());
     __f_.destroy();
     __a.deallocate(this, 1);
 }
@@ -1872,7 +1872,7 @@ template <typename _Fun>
 struct __use_small_storage
     : public _VSTD::integral_constant<
           bool, sizeof(_Fun) <= sizeof(__policy_storage) &&
-                    alignof(_Fun) <= alignof(__policy_storage) &&
+                    _LIBCPP_ALIGNOF(_Fun) <= _LIBCPP_ALIGNOF(__policy_storage) &&
                     _VSTD::is_trivially_copy_constructible<_Fun>::value &&
                     _VSTD::is_trivially_destructible<_Fun>::value> {};
 
@@ -1925,7 +1925,7 @@ struct __policy
         typedef typename __rebind_alloc_helper<__alloc_traits, _Fun>::type
             _FunAlloc;
         _Fun* __f = static_cast<_Fun*>(__s);
-        _FunAlloc __a(__f->__allocator());
+        _FunAlloc __a(__f->__get_allocator());
         __f->destroy();
         __a.deallocate(__f, 1);
     }
diff --git a/include/future b/include/future
index b3ffc7e35..50bdd2da2 100644
--- a/include/future
+++ b/include/future
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- future -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/initializer_list b/include/initializer_list
index b934637b8..6c4493b70 100644
--- a/include/initializer_list
+++ b/include/initializer_list
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------- initializer_list -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/inttypes.h b/include/inttypes.h
index 058f54b51..0f1d4f455 100644
--- a/include/inttypes.h
+++ b/include/inttypes.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- inttypes.h -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/iomanip b/include/iomanip
index 36c11167a..82b7603a3 100644
--- a/include/iomanip
+++ b/include/iomanip
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- iomanip ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ios b/include/ios
index 040b2d4e0..96e84eb38 100644
--- a/include/ios
+++ b/include/ios
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- ios -------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -426,6 +425,16 @@ public:
     virtual ~failure() throw();
 };
 
+_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
+void __throw_failure(char const* __msg) {
+#ifndef _LIBCPP_NO_EXCEPTIONS
+    throw ios_base::failure(__msg);
+#else
+    ((void)__msg);
+    _VSTD::abort();
+#endif
+}
+
 class _LIBCPP_TYPE_VIS ios_base::Init
 {
 public:
diff --git a/include/iosfwd b/include/iosfwd
index 31f1902e5..0ffe75f19 100644
--- a/include/iosfwd
+++ b/include/iosfwd
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- iosfwd -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/iostream b/include/iostream
index 136a84977..595620b8a 100644
--- a/include/iostream
+++ b/include/iostream
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- iostream ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/istream b/include/istream
index 30ee4f4b8..bedd738f1 100644
--- a/include/istream
+++ b/include/istream
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- istream ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/iterator b/include/iterator
index bda177e11..242f18814 100644
--- a/include/iterator
+++ b/include/iterator
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- iterator ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/limits b/include/limits
index 5ea9a9e6f..82c1ea133 100644
--- a/include/limits
+++ b/include/limits
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- limits ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/limits.h b/include/limits.h
index 1867b1048..4a212f8f3 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- limits.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/list b/include/list
index c69e31d93..2afe2a205 100644
--- a/include/list
+++ b/include/list
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- list ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/locale b/include/locale
index ac589d360..c3c05eb39 100644
--- a/include/locale
+++ b/include/locale
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- locale ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -547,7 +546,7 @@ __num_get<_CharT>::__stage2_float_loop(_CharT __ct, bool& __in_units, char& __ex
         __exp = 'P';
     else if ((__x & 0x5F) == __exp)
     {
-        __exp |= 0x80;
+        __exp |= (char) 0x80;
         if (__in_units)
         {
             __in_units = false;
@@ -3568,6 +3567,7 @@ messages<_CharT>::do_open(const basic_string<char>& __nm, const locale&) const
         __cat = static_cast<catalog>((static_cast<size_t>(__cat) >> 1));
     return __cat;
 #else // !_LIBCPP_HAS_CATOPEN
+    _LIBCPP_UNUSED_VAR(__nm);
     return -1;
 #endif // _LIBCPP_HAS_CATOPEN
 }
@@ -3591,6 +3591,9 @@ messages<_CharT>::do_get(catalog __c, int __set, int __msgid,
                                                         __n, __n + strlen(__n));
     return __w;
 #else // !_LIBCPP_HAS_CATOPEN
+    _LIBCPP_UNUSED_VAR(__c);
+    _LIBCPP_UNUSED_VAR(__set);
+    _LIBCPP_UNUSED_VAR(__msgid);
     return __dflt;
 #endif // _LIBCPP_HAS_CATOPEN
 }
@@ -3604,6 +3607,8 @@ messages<_CharT>::do_close(catalog __c) const
         __c <<= 1;
     nl_catd __cat = (nl_catd)__c;
     catclose(__cat);
+#else // !_LIBCPP_HAS_CATOPEN
+    _LIBCPP_UNUSED_VAR(__c);
 #endif // _LIBCPP_HAS_CATOPEN
 }
 
diff --git a/include/locale.h b/include/locale.h
index cad7b8b53..a21ee385c 100644
--- a/include/locale.h
+++ b/include/locale.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- locale.h --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/map b/include/map
index 616bb46cf..e21dd5a84 100644
--- a/include/map
+++ b/include/map
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------- map ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1536,10 +1535,8 @@ map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k)
 {
     __parent_pointer __parent;
     __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (__child == nullptr)
-        throw out_of_range("map::at:  key not found");
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        __throw_out_of_range("map::at:  key not found");
     return static_cast<__node_pointer>(__child)->__value_.__get_value().second;
 }
 
@@ -1549,10 +1546,8 @@ map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k) const
 {
     __parent_pointer __parent;
     __node_base_pointer __child = __tree_.__find_equal(__parent, __k);
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (__child == nullptr)
-        throw out_of_range("map::at:  key not found");
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        __throw_out_of_range("map::at:  key not found");
     return static_cast<__node_pointer>(__child)->__value_.__get_value().second;
 }
 
diff --git a/include/math.h b/include/math.h
index 3cc72aa27..6f9a76ba9 100644
--- a/include/math.h
+++ b/include/math.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- math.h ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/memory b/include/memory
index 3e8f5936e..3398629c1 100644
--- a/include/memory
+++ b/include/memory
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- memory ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1460,29 +1459,21 @@ struct __has_select_on_container_copy_construction
 
 #else  // _LIBCPP_CXX03_LANG
 
-#ifndef _LIBCPP_HAS_NO_VARIADICS
-
-template <class _Alloc, class _Pointer, class ..._Args>
-struct __has_construct
-    : false_type
-{
-};
-
-#else  // _LIBCPP_HAS_NO_VARIADICS
+template <class _Alloc, class _Pointer, class _Tp, class = void>
+struct __has_construct : std::false_type {};
 
-template <class _Alloc, class _Pointer, class _Args>
-struct __has_construct
-    : false_type
-{
-};
+template <class _Alloc, class _Pointer, class _Tp>
+struct __has_construct<_Alloc, _Pointer, _Tp, typename __void_t<
+    decltype(_VSTD::declval<_Alloc>().construct(_VSTD::declval<_Pointer>(), _VSTD::declval<_Tp>()))
+>::type> : std::true_type {};
 
-#endif  // _LIBCPP_HAS_NO_VARIADICS
+template <class _Alloc, class _Pointer, class = void>
+struct __has_destroy : false_type {};
 
 template <class _Alloc, class _Pointer>
-struct __has_destroy
-    : false_type
-{
-};
+struct __has_destroy<_Alloc, _Pointer, typename __void_t<
+    decltype(_VSTD::declval<_Alloc>().destroy(_VSTD::declval<_Pointer>()))
+>::type> : std::true_type {};
 
 template <class _Alloc>
 struct __has_max_size
@@ -1510,6 +1501,12 @@ struct __alloc_traits_difference_type<_Alloc, _Ptr, true>
     typedef typename _Alloc::difference_type type;
 };
 
+template <class _Tp>
+struct __is_default_allocator : false_type {};
+
+template <class _Tp>
+struct __is_default_allocator<_VSTD::allocator<_Tp> > : true_type {};
+
 template <class _Alloc>
 struct _LIBCPP_TEMPLATE_VIS allocator_traits
 {
@@ -1571,9 +1568,10 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
             }
     template <class _Tp, class _A0>
         _LIBCPP_INLINE_VISIBILITY
-        static void construct(allocator_type&, _Tp* __p, const _A0& __a0)
+        static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0)
             {
-                ::new ((void*)__p) _Tp(__a0);
+                __construct(__has_construct<allocator_type, _Tp*, const _A0&>(),
+                            __a, __p, __a0);
             }
     template <class _Tp, class _A0, class _A1>
         _LIBCPP_INLINE_VISIBILITY
@@ -1622,7 +1620,7 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
         static
         typename enable_if
         <
-            (is_same<allocator_type, allocator<_Tp> >::value
+            (__is_default_allocator<allocator_type>::value
                 || !__has_construct<allocator_type, _Tp*, _Tp>::value) &&
              is_trivially_move_constructible<_Tp>::value,
             void
@@ -1647,23 +1645,25 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
                 construct(__a, _VSTD::__to_raw_pointer(__begin2), *__begin1);
         }
 
-    template <class _Tp>
+    template <class _SourceTp, class _DestTp,
+              class _RawSourceTp = typename remove_const<_SourceTp>::type,
+              class _RawDestTp = typename remove_const<_DestTp>::type>
         _LIBCPP_INLINE_VISIBILITY
         static
         typename enable_if
         <
-            (is_same<allocator_type, allocator<_Tp> >::value
-                || !__has_construct<allocator_type, _Tp*, _Tp>::value) &&
-             is_trivially_move_constructible<_Tp>::value,
+            is_trivially_move_constructible<_DestTp>::value &&
+            is_same<_RawSourceTp, _RawDestTp>::value &&
+            (__is_default_allocator<allocator_type>::value ||
+             !__has_construct<allocator_type, _DestTp*, _SourceTp&>::value),
             void
         >::type
-        __construct_range_forward(allocator_type&, _Tp* __begin1, _Tp* __end1, _Tp*& __begin2)
+        __construct_range_forward(allocator_type&, _SourceTp* __begin1, _SourceTp* __end1, _DestTp*& __begin2)
         {
-            typedef typename remove_const<_Tp>::type _Vp;
             ptrdiff_t _Np = __end1 - __begin1;
             if (_Np > 0)
             {
-                _VSTD::memcpy(const_cast<_Vp*>(__begin2), __begin1, _Np * sizeof(_Tp));
+                _VSTD::memcpy(const_cast<_RawDestTp*>(__begin2), __begin1, _Np * sizeof(_DestTp));
                 __begin2 += _Np;
             }
         }
@@ -1686,7 +1686,7 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
         static
         typename enable_if
         <
-            (is_same<allocator_type, allocator<_Tp> >::value
+            (__is_default_allocator<allocator_type>::value
                 || !__has_construct<allocator_type, _Tp*, _Tp>::value) &&
              is_trivially_move_constructible<_Tp>::value,
             void
@@ -1721,6 +1721,19 @@ private:
             {
                 ::new ((void*)__p) _Tp(_VSTD::forward<_Args>(__args)...);
             }
+#else  // _LIBCPP_HAS_NO_VARIADICS
+    template <class _Tp, class _A0>
+        _LIBCPP_INLINE_VISIBILITY
+        static void __construct(true_type, allocator_type& __a, _Tp* __p,
+                                const _A0& __a0)
+            {__a.construct(__p, __a0);}
+    template <class _Tp, class _A0>
+        _LIBCPP_INLINE_VISIBILITY
+        static void __construct(false_type, allocator_type&, _Tp* __p,
+                                const _A0& __a0)
+            {
+                ::new ((void*)__p) _Tp(__a0);
+            }
 #endif  // _LIBCPP_HAS_NO_VARIADICS
 
     template <class _Tp>
@@ -1797,10 +1810,10 @@ public:
         if (__n > max_size())
             __throw_length_error("allocator<T>::allocate(size_t n)"
                                  " 'n' exceeds maximum supported size");
-        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), __alignof(_Tp)));
+        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
         }
     _LIBCPP_INLINE_VISIBILITY void deallocate(pointer __p, size_type __n) _NOEXCEPT
-        {_VSTD::__libcpp_deallocate((void*)__p, __n * sizeof(_Tp), __alignof(_Tp));}
+        {_VSTD::__libcpp_deallocate((void*)__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));}
     _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT
         {return size_type(~0) / sizeof(_Tp);}
 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
@@ -1898,10 +1911,10 @@ public:
         if (__n > max_size())
             __throw_length_error("allocator<const T>::allocate(size_t n)"
                                  " 'n' exceeds maximum supported size");
-        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), __alignof(_Tp)));
+        return static_cast<pointer>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
     }
     _LIBCPP_INLINE_VISIBILITY void deallocate(pointer __p, size_type __n) _NOEXCEPT
-        {_VSTD::__libcpp_deallocate((void*) const_cast<_Tp *>(__p), __n * sizeof(_Tp), __alignof(_Tp));}
+        {_VSTD::__libcpp_deallocate((void*) const_cast<_Tp *>(__p), __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));}
     _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT
         {return size_type(~0) / sizeof(_Tp);}
 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
@@ -2017,7 +2030,7 @@ get_temporary_buffer(ptrdiff_t __n) _NOEXCEPT
     while (__n > 0)
     {
 #if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
-    if (__is_overaligned_for_new(__alignof(_Tp)))
+    if (__is_overaligned_for_new(_LIBCPP_ALIGNOF(_Tp)))
         {
             std::align_val_t __al =
                 std::align_val_t(std::alignment_of<_Tp>::value);
@@ -2028,7 +2041,7 @@ get_temporary_buffer(ptrdiff_t __n) _NOEXCEPT
                 __n * sizeof(_Tp), nothrow));
         }
 #else
-    if (__is_overaligned_for_new(__alignof(_Tp)))
+    if (__is_overaligned_for_new(_LIBCPP_ALIGNOF(_Tp)))
         {
             // Since aligned operator new is unavailable, return an empty
             // buffer rather than one with invalid alignment.
@@ -2052,7 +2065,7 @@ template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 void return_temporary_buffer(_Tp* __p) _NOEXCEPT
 {
-  _VSTD::__libcpp_deallocate_unsized((void*)__p, __alignof(_Tp));
+  _VSTD::__libcpp_deallocate_unsized((void*)__p, _LIBCPP_ALIGNOF(_Tp));
 }
 
 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR)
@@ -5628,7 +5641,7 @@ template <class _Tp, class _Alloc>
 struct __temp_value {
     typedef allocator_traits<_Alloc> _Traits;
 
-    typename aligned_storage<sizeof(_Tp), alignof(_Tp)>::type __v;
+    typename aligned_storage<sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)>::type __v;
     _Alloc &__a;
 
     _Tp *__addr() { return reinterpret_cast<_Tp *>(addressof(__v)); }
diff --git a/include/module.modulemap b/include/module.modulemap
index 6d88f5211..bbfe90ed5 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -24,7 +24,10 @@ module std [system] {
       header "errno.h"
       export *
     }
-    // <fenv.h> provided by C library.
+    module fenv_h {
+      header "fenv.h"
+      export *
+    }
     // <float.h> provided by compiler or C library.
     module inttypes_h {
       header "inttypes.h"
diff --git a/include/mutex b/include/mutex
index 6d2de2b46..98bd581eb 100644
--- a/include/mutex
+++ b/include/mutex
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- mutex ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/new b/include/new
index 24ffcad5a..b5e8fb412 100644
--- a/include/new
+++ b/include/new
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------- new ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/numeric b/include/numeric
index 4e68239d0..99417703e 100644
--- a/include/numeric
+++ b/include/numeric
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- numeric ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/optional b/include/optional
index 544140f23..be584b3ce 100644
--- a/include/optional
+++ b/include/optional
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- optional ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -105,8 +104,8 @@ namespace std {
 
     // 23.6.3.3, assignment
     optional &operator=(nullopt_t) noexcept;
-    optional &operator=(const optional &);
-    optional &operator=(optional &&) noexcept(see below );
+    optional &operator=(const optional &);                // constexpr in C++20
+    optional &operator=(optional &&) noexcept(see below); // constexpr in C++20
     template <class U = T> optional &operator=(U &&);
     template <class U> optional &operator=(const optional<U> &);
     template <class U> optional &operator=(optional<U> &&);
diff --git a/include/ostream b/include/ostream
index d700a369b..b20ac34a3 100644
--- a/include/ostream
+++ b/include/ostream
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- ostream -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/queue b/include/queue
index 4677e52ae..55be80017 100644
--- a/include/queue
+++ b/include/queue
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- queue ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/random b/include/random
index 724bd0fc2..a73239519 100644
--- a/include/random
+++ b/include/random
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- random -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/ratio b/include/ratio
index 7ee5ec245..fa7a4bbb2 100644
--- a/include/ratio
+++ b/include/ratio
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- ratio -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/regex b/include/regex
index bd83d7c10..c381b5116 100644
--- a/include/regex
+++ b/include/regex
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- regex ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -6140,7 +6139,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY
     reference operator*() const {return  __match_;}
     _LIBCPP_INLINE_VISIBILITY
-    pointer operator->() const  {return &__match_;}
+    pointer operator->() const  {return _VSTD::addressof(__match_);}
 
     regex_iterator& operator++();
     _LIBCPP_INLINE_VISIBILITY
@@ -6164,7 +6163,7 @@ regex_iterator<_BidirectionalIterator, _CharT, _Traits>::
                    const regex_type& __re, regex_constants::match_flag_type __m)
     : __begin_(__a),
       __end_(__b),
-      __pregex_(&__re),
+      __pregex_(_VSTD::addressof(__re)),
       __flags_(__m)
 {
     _VSTD::regex_search(__begin_, __end_, __match_, *__pregex_, __flags_);
@@ -6405,7 +6404,7 @@ regex_token_iterator<_BidirectionalIterator, _CharT, _Traits>::
                              regex_constants::match_flag_type __m)
     : __position_(__a, __b, __re, __m),
       __n_(0),
-      __subs_(__submatches, __submatches + _Np)
+      __subs_(begin(__submatches), end(__submatches))
 {
     __init(__a, __b);
 }
diff --git a/include/scoped_allocator b/include/scoped_allocator
index bdbb0136b..237cd428d 100644
--- a/include/scoped_allocator
+++ b/include/scoped_allocator
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- scoped_allocator --------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/set b/include/set
index a0155f0b2..17837228f 100644
--- a/include/set
+++ b/include/set
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- set -------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/setjmp.h b/include/setjmp.h
index 464b4a540..f30a8d401 100644
--- a/include/setjmp.h
+++ b/include/setjmp.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- setjmp.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/shared_mutex b/include/shared_mutex
index 3daf74d26..fcafd8c0f 100644
--- a/include/shared_mutex
+++ b/include/shared_mutex
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ shared_mutex --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/span b/include/span
index cebe98760..774f69823 100644
--- a/include/span
+++ b/include/span
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 
diff --git a/include/sstream b/include/sstream
index 9c3ee13bf..14c91971c 100644
--- a/include/sstream
+++ b/include/sstream
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- sstream ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -559,7 +558,7 @@ basic_stringbuf<_CharT, _Traits, _Allocator>::overflow(int_type __c)
             char_type* __p = const_cast<char_type*>(__str_.data());
             this->setg(__p, __p + __ninp, __hm_);
         }
-        return this->sputc(__c);
+        return this->sputc(traits_type::to_char_type(__c));
     }
     return traits_type::not_eof(__c);
 }
diff --git a/include/stack b/include/stack
index 2b3f8aea1..b50ca5cdc 100644
--- a/include/stack
+++ b/include/stack
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- stack -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/stdbool.h b/include/stdbool.h
index 86a127f0f..81a7cb303 100644
--- a/include/stdbool.h
+++ b/include/stdbool.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- stdbool.h --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef _LIBCPP_STDBOOL_H
diff --git a/include/stddef.h b/include/stddef.h
index f65065d86..6497dcda2 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- stddef.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/stdexcept b/include/stdexcept
index 3ec79349a..6eda619b8 100644
--- a/include/stdexcept
+++ b/include/stdexcept
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- stdexcept --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/stdint.h b/include/stdint.h
index 468f6cd97..c89229845 100644
--- a/include/stdint.h
+++ b/include/stdint.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- stdint.h --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/stdio.h b/include/stdio.h
index 77a314bf3..e08e6bc9b 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- stdio.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/stdlib.h b/include/stdlib.h
index f11c5e762..2087544de 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- stdlib.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/streambuf b/include/streambuf
index dd293dc63..48c07d5e1 100644
--- a/include/streambuf
+++ b/include/streambuf
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------- streambuf ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/string b/include/string
index fb838d1e5..e6d161423 100644
--- a/include/string
+++ b/include/string
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- string -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/string.h b/include/string.h
index a1ce56cbc..e09251d06 100644
--- a/include/string.h
+++ b/include/string.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- string.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/string_view b/include/string_view
index 7d783122f..79565c245 100644
--- a/include/string_view
+++ b/include/string_view
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ string_view ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/strstream b/include/strstream
index b00b9d830..31999bbae 100644
--- a/include/strstream
+++ b/include/strstream
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- strstream --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/android/locale_bionic.h b/include/support/android/locale_bionic.h
index 50fcf5c36..5b16071d9 100644
--- a/include/support/android/locale_bionic.h
+++ b/include/support/android/locale_bionic.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------- support/android/locale_bionic.h ------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/fuchsia/xlocale.h b/include/support/fuchsia/xlocale.h
index 1de2fca28..b86ce9efb 100644
--- a/include/support/fuchsia/xlocale.h
+++ b/include/support/fuchsia/xlocale.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------- support/fuchsia/xlocale.h ------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/ibm/limits.h b/include/support/ibm/limits.h
index efdb35965..d1c59f066 100644
--- a/include/support/ibm/limits.h
+++ b/include/support/ibm/limits.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------- support/ibm/limits.h ---------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/ibm/locale_mgmt_aix.h b/include/support/ibm/locale_mgmt_aix.h
index e3b7a78c4..e452dc325 100644
--- a/include/support/ibm/locale_mgmt_aix.h
+++ b/include/support/ibm/locale_mgmt_aix.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------- support/ibm/locale_mgmt_aix.h --------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/ibm/support.h b/include/support/ibm/support.h
index 0abfa7f95..0569cbe74 100644
--- a/include/support/ibm/support.h
+++ b/include/support/ibm/support.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------- support/ibm/support.h ----------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/ibm/xlocale.h b/include/support/ibm/xlocale.h
index f39c0ba95..9f0522c19 100644
--- a/include/support/ibm/xlocale.h
+++ b/include/support/ibm/xlocale.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------- support/ibm/xlocale.h -------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/musl/xlocale.h b/include/support/musl/xlocale.h
index 3e31c9959..722d13fa1 100644
--- a/include/support/musl/xlocale.h
+++ b/include/support/musl/xlocale.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------- support/musl/xlocale.h ------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // This adds support for the extended locale functions that are currently
diff --git a/include/support/newlib/xlocale.h b/include/support/newlib/xlocale.h
index 09f9e3987..25fa798b6 100644
--- a/include/support/newlib/xlocale.h
+++ b/include/support/newlib/xlocale.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/solaris/floatingpoint.h b/include/support/solaris/floatingpoint.h
index 999d144b1..5f1628fbe 100644
--- a/include/support/solaris/floatingpoint.h
+++ b/include/support/solaris/floatingpoint.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/solaris/wchar.h b/include/support/solaris/wchar.h
index 0e8e660c8..9dc9ac3f0 100644
--- a/include/support/solaris/wchar.h
+++ b/include/support/solaris/wchar.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/solaris/xlocale.h b/include/support/solaris/xlocale.h
index e20ef7a6e..05131f027 100644
--- a/include/support/solaris/xlocale.h
+++ b/include/support/solaris/xlocale.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/win32/limits_msvc_win32.h b/include/support/win32/limits_msvc_win32.h
index 1ab2e0b6d..7bb835559 100644
--- a/include/support/win32/limits_msvc_win32.h
+++ b/include/support/win32/limits_msvc_win32.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------ support/win32/limits_msvc_win32.h -----------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/win32/locale_win32.h b/include/support/win32/locale_win32.h
index c7c6d786c..0d03d834b 100644
--- a/include/support/win32/locale_win32.h
+++ b/include/support/win32/locale_win32.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------- support/win32/locale_win32.h -------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/xlocale/__nop_locale_mgmt.h b/include/support/xlocale/__nop_locale_mgmt.h
index 0d3f23a2c..f33d3894c 100644
--- a/include/support/xlocale/__nop_locale_mgmt.h
+++ b/include/support/xlocale/__nop_locale_mgmt.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------  support/xlocale/__nop_locale_mgmt.h -----------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/support/xlocale/__posix_l_fallback.h b/include/support/xlocale/__posix_l_fallback.h
index b9a0939f8..f3df6c46f 100644
--- a/include/support/xlocale/__posix_l_fallback.h
+++ b/include/support/xlocale/__posix_l_fallback.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------- support/xlocale/__posix_l_fallback.h -----------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // These are reimplementations of some extended locale functions ( *_l ) that
diff --git a/include/support/xlocale/__strtonum_fallback.h b/include/support/xlocale/__strtonum_fallback.h
index 50b4db354..df3859805 100644
--- a/include/support/xlocale/__strtonum_fallback.h
+++ b/include/support/xlocale/__strtonum_fallback.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------- support/xlocale/__strtonum_fallback.h -----------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // These are reimplementations of some extended locale functions ( *_l ) that
diff --git a/include/system_error b/include/system_error
index 6e2c8388f..05ef07950 100644
--- a/include/system_error
+++ b/include/system_error
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------------- system_error ----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/tgmath.h b/include/tgmath.h
index aba87499c..2dc1f771d 100644
--- a/include/tgmath.h
+++ b/include/tgmath.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- tgmath.h ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/thread b/include/thread
index 8c0115f87..df06ff70f 100644
--- a/include/thread
+++ b/include/thread
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- thread -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/tuple b/include/tuple
index 2e54a5f66..f7e7ee194 100644
--- a/include/tuple
+++ b/include/tuple
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- tuple ------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -84,8 +83,8 @@ template <class T, class Tuple>
   constexpr T make_from_tuple(Tuple&& t); // C++17
 
 // 20.4.1.4, tuple helper classes:
-template <class T> class tuple_size; // undefined
-template <class... T> class tuple_size<tuple<T...>>;
+template <class T> struct tuple_size; // undefined
+template <class... T> struct tuple_size<tuple<T...>>;
 template <class T>
  inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17
 template <size_t I, class T> class tuple_element; // undefined
@@ -1121,6 +1120,7 @@ inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 bool
 operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
+    static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
     return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
 }
 
@@ -1164,6 +1164,7 @@ inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 bool
 operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
+    static_assert (sizeof...(_Tp) == sizeof...(_Up), "Can't compare tuples of different sizes");
     return __tuple_less<sizeof...(_Tp)>()(__x, __y);
 }
 
diff --git a/include/type_traits b/include/type_traits
index ab010716f..37b7ca1a3 100644
--- a/include/type_traits
+++ b/include/type_traits
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ type_traits ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1652,7 +1651,7 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_unique_object_representations_v
 // alignment_of
 
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of
-    : public integral_constant<size_t, __alignof__(_Tp)> {};
+    : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {};
 
 #if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
 template <class _Tp>
@@ -1682,7 +1681,7 @@ struct __nat
 template <class _Tp>
 struct __align_type
 {
-    static const size_t value = alignment_of<_Tp>::value;
+    static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp);
     typedef _Tp type;
 };
 
@@ -1815,8 +1814,8 @@ struct __static_max<_I0, _I1, _In...>
 template <size_t _Len, class _Type0, class ..._Types>
 struct aligned_union
 {
-    static const size_t alignment_value = __static_max<__alignof__(_Type0),
-                                                       __alignof__(_Types)...>::value;
+    static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0),
+                                                       _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value;
     static const size_t __len = __static_max<_Len, sizeof(_Type0),
                                              sizeof(_Types)...>::value;
     typedef typename aligned_storage<__len, alignment_value>::type type;
@@ -4361,28 +4360,31 @@ _LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)
 #undef _LIBCPP_INVOKE_RETURN
 
 // __invokable
-
 template <class _Ret, class _Fp, class ..._Args>
 struct __invokable_r
 {
-    // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void,
-    // or incomplete array types as required by the standard.
-    using _Result = decltype(
-        _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...));
+  template <class _XFp, class ..._XArgs>
+  static auto __try_call(int) -> decltype(
+    _VSTD::__invoke(_VSTD::declval<_XFp>(), _VSTD::declval<_XArgs>()...));
+  template <class _XFp, class ..._XArgs>
+  static __nat __try_call(...);
 
-    using type =
-        typename conditional<
-            !is_same<_Result, __nat>::value,
-            typename conditional<
-                is_void<_Ret>::value,
-                true_type,
-                is_convertible<_Result, _Ret>
-            >::type,
-            false_type
-        >::type;
-    static const bool value = type::value;
-};
+  // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void,
+  // or incomplete array types as required by the standard.
+  using _Result = decltype(__try_call<_Fp, _Args...>(0));
 
+  using type =
+  typename conditional<
+      !is_same<_Result, __nat>::value,
+      typename conditional<
+          is_void<_Ret>::value,
+          true_type,
+          is_convertible<_Result, _Ret>
+      >::type,
+      false_type
+  >::type;
+  static const bool value = type::value;
+};
 template <class _Fp, class ..._Args>
 using __invokable = __invokable_r<void, _Fp, _Args...>;
 
diff --git a/include/typeindex b/include/typeindex
index 0565ca913..bff1e65af 100644
--- a/include/typeindex
+++ b/include/typeindex
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- typeindex ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/typeinfo b/include/typeinfo
index 92f1e2255..5bcb6b2c1 100644
--- a/include/typeinfo
+++ b/include/typeinfo
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- typeinfo ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,59 +72,31 @@ public:
 #include <vcruntime_typeinfo.h>
 #else
 
-#if !defined(_LIBCPP_ABI_MICROSOFT)
-#if defined(_LIBCPP_NONUNIQUE_RTTI_BIT)
-#define _LIBCPP_HAS_NONUNIQUE_TYPEINFO
-#else
-#define _LIBCPP_HAS_UNIQUE_TYPEINFO
-#endif
+#if defined(_LIBCPP_NONUNIQUE_RTTI_BIT) && !defined(_LIBCPP_ABI_MICROSOFT)
+#   define _LIBCPP_HAS_NONUNIQUE_TYPEINFO
 #endif
 
 namespace std  // purposefully not using versioning namespace
 {
 
+#if defined(_LIBCPP_ABI_MICROSOFT)
+
 class _LIBCPP_EXCEPTION_ABI type_info
 {
     type_info& operator=(const type_info&);
     type_info(const type_info&);
 
-#if defined(_LIBCPP_HAS_NONUNIQUE_TYPEINFO)
-    _LIBCPP_INLINE_VISIBILITY
-    int __compare_nonunique_names(const type_info &__arg) const _NOEXCEPT
-    { return __builtin_strcmp(name(), __arg.name()); }
-#endif
-
-#if defined(_LIBCPP_ABI_MICROSOFT)
     mutable struct {
       const char *__undecorated_name;
       const char __decorated_name[1];
     } __data;
 
     int __compare(const type_info &__rhs) const _NOEXCEPT;
-#endif // _LIBCPP_ABI_MICROSOFT
-
-protected:
-#if !defined(_LIBCPP_ABI_MICROSOFT)
-#if defined(_LIBCPP_HAS_NONUNIQUE_TYPEINFO)
-    // A const char* with the non-unique RTTI bit possibly set.
-    uintptr_t __type_name;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit type_info(const char* __n)
-      : __type_name(reinterpret_cast<uintptr_t>(__n)) {}
-#else
-    const char *__type_name;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit type_info(const char* __n) : __type_name(__n) {}
-#endif
-#endif // ! _LIBCPP_ABI_MICROSOFT
 
 public:
     _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE
     virtual ~type_info();
 
-#if defined(_LIBCPP_ABI_MICROSOFT)
     const char *name() const _NOEXCEPT;
 
     _LIBCPP_INLINE_VISIBILITY
@@ -139,8 +110,48 @@ public:
     bool operator==(const type_info& __arg) const _NOEXCEPT {
       return __compare(__arg) == 0;
     }
-#else
-#if defined(_LIBCPP_HAS_NONUNIQUE_TYPEINFO)
+
+    _LIBCPP_INLINE_VISIBILITY
+    bool operator!=(const type_info& __arg) const _NOEXCEPT
+    { return !operator==(__arg); }
+};
+
+#elif defined(_LIBCPP_HAS_NONUNIQUE_TYPEINFO)
+
+// This implementation of type_info does not assume always a unique copy of
+// the RTTI for a given type inside a program. It packs the pointer to the
+// type name into a uintptr_t and reserves the high bit of that pointer (which
+// is assumed to be free for use under the ABI in use) to represent whether
+// that specific copy of the RTTI can be assumed unique inside the program.
+// To implement equality-comparison of type_infos, we check whether BOTH
+// type_infos are guaranteed unique, and if so, we simply compare the addresses
+// of their type names instead of doing a deep string comparison, which is
+// faster. If at least one of the type_infos can't guarantee uniqueness, we
+// have no choice but to fall back to a deep string comparison.
+//
+// Note that the compiler is the one setting (or unsetting) the high bit of
+// the pointer when it constructs the type_info, depending on whether it can
+// guarantee uniqueness for that specific type_info.
+class _LIBCPP_EXCEPTION_ABI type_info
+{
+    type_info& operator=(const type_info&);
+    type_info(const type_info&);
+
+    _LIBCPP_INLINE_VISIBILITY
+    int __compare_nonunique_names(const type_info &__arg) const _NOEXCEPT
+    { return __builtin_strcmp(name(), __arg.name()); }
+
+protected:
+    uintptr_t __type_name;
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit type_info(const char* __n)
+      : __type_name(reinterpret_cast<uintptr_t>(__n)) {}
+
+public:
+    _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE
+    virtual ~type_info();
+
     _LIBCPP_INLINE_VISIBILITY
     const char* name() const _NOEXCEPT
     {
@@ -179,7 +190,35 @@ public:
         return false;
       return __compare_nonunique_names(__arg) == 0;
     }
-#else
+
+    _LIBCPP_INLINE_VISIBILITY
+    bool operator!=(const type_info& __arg) const _NOEXCEPT
+    { return !operator==(__arg); }
+};
+
+#else // !_LIBCPP_ABI_MICROSOFT && !_LIBCPP_HAS_NONUNIQUE_TYPEINFO
+
+// This implementation of type_info assumes a unique copy of the RTTI for a
+// given type inside a program. This is a valid assumption when abiding to
+// Itanium ABI (http://itanium-cxx-abi.github.io/cxx-abi/abi.html#vtable-components).
+// Under this assumption, we can always compare the addresses of the type names
+// to implement equality-comparison of type_infos instead of having to perform
+// a deep string comparison.
+class _LIBCPP_EXCEPTION_ABI type_info
+{
+    type_info& operator=(const type_info&);
+    type_info(const type_info&);
+
+protected:
+    const char *__type_name;
+
+    _LIBCPP_INLINE_VISIBILITY
+    explicit type_info(const char* __n) : __type_name(__n) {}
+
+public:
+    _LIBCPP_AVAILABILITY_TYPEINFO_VTABLE
+    virtual ~type_info();
+
     _LIBCPP_INLINE_VISIBILITY
     const char* name() const _NOEXCEPT
     { return __type_name; }
@@ -195,14 +234,14 @@ public:
     _LIBCPP_INLINE_VISIBILITY
     bool operator==(const type_info& __arg) const _NOEXCEPT
     { return __type_name == __arg.__type_name; }
-#endif
-#endif // _LIBCPP_ABI_MICROSOFT
 
     _LIBCPP_INLINE_VISIBILITY
     bool operator!=(const type_info& __arg) const _NOEXCEPT
     { return !operator==(__arg); }
 };
 
+#endif
+
 class _LIBCPP_EXCEPTION_ABI bad_cast
     : public exception
 {
diff --git a/include/unordered_map b/include/unordered_map
index 6035b05dc..7ae9805d8 100644
--- a/include/unordered_map
+++ b/include/unordered_map
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- unordered_map -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1603,10 +1602,8 @@ _Tp&
 unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::at(const key_type& __k)
 {
     iterator __i = find(__k);
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (__i == end())
-        throw out_of_range("unordered_map::at: key not found");
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        __throw_out_of_range("unordered_map::at: key not found");
     return __i->second;
 }
 
@@ -1615,10 +1612,8 @@ const _Tp&
 unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::at(const key_type& __k) const
 {
     const_iterator __i = find(__k);
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (__i == end())
-        throw out_of_range("unordered_map::at: key not found");
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        __throw_out_of_range("unordered_map::at: key not found");
     return __i->second;
 }
 
diff --git a/include/unordered_set b/include/unordered_set
index b4e61da89..4cfaa86b8 100644
--- a/include/unordered_set
+++ b/include/unordered_set
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- unordered_set -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/utility b/include/utility
index fb7f44705..770d160f2 100644
--- a/include/utility
+++ b/include/utility
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- utility -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -103,7 +102,7 @@ swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
 struct piecewise_construct_t { };
 inline constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
 
-template <class T> class tuple_size;
+template <class T> struct tuple_size;
 template <size_t I, class T> class tuple_element;
 
 template <class T1, class T2> struct tuple_size<pair<T1, T2> >;
@@ -303,6 +302,7 @@ extern _LIBCPP_EXPORTED_FROM_ABI const piecewise_construct_t piecewise_construct
 #endif
 
 #if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
+template <class, class>
 struct __non_trivially_copyable_base {
   _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
   __non_trivially_copyable_base() _NOEXCEPT {}
@@ -314,7 +314,7 @@ struct __non_trivially_copyable_base {
 template <class _T1, class _T2>
 struct _LIBCPP_TEMPLATE_VIS pair
 #if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
-: private __non_trivially_copyable_base
+: private __non_trivially_copyable_base<_T1, _T2>
 #endif
 {
     typedef _T1 first_type;
@@ -683,7 +683,7 @@ make_pair(_T1 __x, _T2 __y)
 #endif  // _LIBCPP_CXX03_LANG
 
 template <class _T1, class _T2>
-  class _LIBCPP_TEMPLATE_VIS tuple_size<pair<_T1, _T2> >
+  struct _LIBCPP_TEMPLATE_VIS tuple_size<pair<_T1, _T2> >
     : public integral_constant<size_t, 2> {};
 
 template <size_t _Ip, class _T1, class _T2>
diff --git a/include/valarray b/include/valarray
index 3188b6af4..c9ca08c61 100644
--- a/include/valarray
+++ b/include/valarray
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- valarray ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -2740,7 +2739,7 @@ __val_expr<_ValExpr>::operator valarray<__val_expr::result_type>() const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<result_type*>(
-                    _VSTD::__libcpp_allocate(__n * sizeof(result_type), __alignof(result_type)));
+                    _VSTD::__libcpp_allocate(__n * sizeof(result_type), _LIBCPP_ALIGNOF(result_type)));
         for (size_t __i = 0; __i != __n; ++__r.__end_, ++__i)
             ::new (__r.__end_) result_type(__expr_[__i]);
     }
@@ -2758,7 +2757,7 @@ valarray<_Tp>::valarray(size_t __n)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-            _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+            _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -2793,7 +2792,7 @@ valarray<_Tp>::valarray(const value_type* __p, size_t __n)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-            _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+            _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -2819,7 +2818,7 @@ valarray<_Tp>::valarray(const valarray& __v)
     if (__v.size())
     {
         __begin_ = __end_ = static_cast<value_type*>(
-            _VSTD::__libcpp_allocate(__v.size() * sizeof(value_type), __alignof(value_type)));
+            _VSTD::__libcpp_allocate(__v.size() * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -2857,7 +2856,7 @@ valarray<_Tp>::valarray(initializer_list<value_type> __il)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-_VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+_VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -2887,7 +2886,7 @@ valarray<_Tp>::valarray(const slice_array<value_type>& __sa)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-          _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+          _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -2915,7 +2914,7 @@ valarray<_Tp>::valarray(const gslice_array<value_type>& __ga)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -2945,7 +2944,7 @@ valarray<_Tp>::valarray(const mask_array<value_type>& __ma)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -2975,7 +2974,7 @@ valarray<_Tp>::valarray(const indirect_array<value_type>& __ia)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
@@ -3012,7 +3011,7 @@ valarray<_Tp>::__assign_range(const value_type* __f, const value_type* __l)
     {
         __clear(size());
         __begin_ = static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         __end_ = __begin_ + __n;
         _VSTD::uninitialized_copy(__f, __l, __begin_);
     } else {
@@ -3268,7 +3267,7 @@ valarray<_Tp>::operator+() const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         for (const value_type* __p = __begin_; __n; ++__r.__end_, ++__p, --__n)
             ::new (__r.__end_) value_type(+*__p);
     }
@@ -3286,7 +3285,7 @@ valarray<_Tp>::operator-() const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         for (const value_type* __p = __begin_; __n; ++__r.__end_, ++__p, --__n)
             ::new (__r.__end_) value_type(-*__p);
     }
@@ -3304,7 +3303,7 @@ valarray<_Tp>::operator~() const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         for (const value_type* __p = __begin_; __n; ++__r.__end_, ++__p, --__n)
             ::new (__r.__end_) value_type(~*__p);
     }
@@ -3321,7 +3320,7 @@ valarray<_Tp>::operator!() const
     {
         __r.__begin_ =
             __r.__end_ =
-                static_cast<bool*>(_VSTD::__libcpp_allocate(__n * sizeof(bool), __alignof(bool)));
+                static_cast<bool*>(_VSTD::__libcpp_allocate(__n * sizeof(bool), _LIBCPP_ALIGNOF(bool)));
         for (const value_type* __p = __begin_; __n; ++__r.__end_, ++__p, --__n)
             ::new (__r.__end_) bool(!*__p);
     }
@@ -3642,7 +3641,7 @@ valarray<_Tp>::shift(int __i) const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         const value_type* __sb;
         value_type* __tb;
         value_type* __te;
@@ -3681,7 +3680,7 @@ valarray<_Tp>::cshift(int __i) const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         __i %= static_cast<int>(__n);
         const value_type* __m = __i >= 0 ? __begin_ + __i : __end_ + __i;
         for (const value_type* __s = __m; __s != __end_; ++__r.__end_, ++__s)
@@ -3703,7 +3702,7 @@ valarray<_Tp>::apply(value_type __f(value_type)) const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         for (const value_type* __p = __begin_; __n; ++__r.__end_, ++__p, --__n)
             ::new (__r.__end_) value_type(__f(*__p));
     }
@@ -3721,7 +3720,7 @@ valarray<_Tp>::apply(value_type __f(const value_type&)) const
         __r.__begin_ =
             __r.__end_ =
                 static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
         for (const value_type* __p = __begin_; __n; ++__r.__end_, ++__p, --__n)
             ::new (__r.__end_) value_type(__f(*__p));
     }
@@ -3736,7 +3735,7 @@ void valarray<_Tp>::__clear(size_t __capacity)
   {
     while (__end_ != __begin_)
       (--__end_)->~value_type();
-    _VSTD::__libcpp_deallocate(__begin_, __capacity * sizeof(value_type), __alignof(value_type));
+    _VSTD::__libcpp_deallocate(__begin_, __capacity * sizeof(value_type), _LIBCPP_ALIGNOF(value_type));
     __begin_ = __end_ = nullptr;
   }
 }
@@ -3749,7 +3748,7 @@ valarray<_Tp>::resize(size_t __n, value_type __x)
     if (__n)
     {
         __begin_ = __end_ = static_cast<value_type*>(
-           _VSTD::__libcpp_allocate(__n * sizeof(value_type), __alignof(value_type)));
+           _VSTD::__libcpp_allocate(__n * sizeof(value_type), _LIBCPP_ALIGNOF(value_type)));
 #ifndef _LIBCPP_NO_EXCEPTIONS
         try
         {
diff --git a/include/variant b/include/variant
index b33b1c40a..5d0722b62 100644
--- a/include/variant
+++ b/include/variant
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ variant -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,8 +22,8 @@ namespace std {
 
     // 20.7.2.1, constructors
     constexpr variant() noexcept(see below);
-    variant(const variant&);
-    variant(variant&&) noexcept(see below);
+    variant(const variant&);                // constexpr in C++20
+    variant(variant&&) noexcept(see below); // constexpr in C++20
 
     template <class T> constexpr variant(T&&) noexcept(see below);
 
@@ -46,8 +45,8 @@ namespace std {
     ~variant();
 
     // 20.7.2.3, assignment
-    variant& operator=(const variant&);
-    variant& operator=(variant&&) noexcept(see below);
+    variant& operator=(const variant&);                // constexpr in C++20
+    variant& operator=(variant&&) noexcept(see below); // constexpr in C++20
 
     template <class T> variant& operator=(T&&) noexcept(see below);
 
@@ -1066,7 +1065,7 @@ public:
 #ifndef _LIBCPP_NO_EXCEPTIONS
       // EXTENSION: When the move construction of `__lhs` into `__rhs` throws
       // and `__tmp` is nothrow move constructible then we move `__tmp` back
-      // into `__rhs` and provide the strong exception safety guarentee.
+      // into `__rhs` and provide the strong exception safety guarantee.
       try {
         this->__generic_construct(*__rhs, _VSTD::move(*__lhs));
       } catch (...) {
diff --git a/include/vector b/include/vector
index edb6d3e09..79d17675a 100644
--- a/include/vector
+++ b/include/vector
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ vector --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/version b/include/version
index d6ccb138f..1037ee5df 100644
--- a/include/version
+++ b/include/version
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- version ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,92 +11,105 @@
 #define _LIBCPP_VERSIONH
 
 /*
-    version synopsis
+  version synopsis
 
-    Table 35 — Standard library feature-test macros
-Macro name                                  Value   Headers
-__cpp_lib_addressof_constexpr               201603L <memory>
-__cpp_lib_allocator_traits_is_always_equal  201411L <memory> <scoped_allocator> <string> 
-                                                    <deque> <forward_list> <list> <vector>
-                                                    <map> <set> <unordered_map> <unordered_set>
-__cpp_lib_any                               201606L <any>
-__cpp_lib_apply                             201603L <tuple>
-__cpp_lib_array_constexpr                   201603L <iterator> <array>
-__cpp_lib_as_const                          201510L <utility>
-__cpp_lib_atomic_is_always_lock_free        201603L <atomic>
-__cpp_lib_atomic_ref                        201806L <atomic>
-__cpp_lib_bit_cast                          201806L <bit>
-__cpp_lib_bool_constant                     201505L <type_traits>
-__cpp_lib_boyer_moore_searcher              201603L <functional>
-__cpp_lib_byte                              201603L <cstddef>
-__cpp_lib_char8_t                           201811L <atomic> <filesystem> <istream> <limits>
-                                                    <locale> <ostream> <string> <string_view>
-__cpp_lib_chrono                            201611L <chrono>
-__cpp_lib_chrono_udls                       201304L <chrono>
-__cpp_lib_clamp                             201603L <algorithm>
-__cpp_lib_complex_udls                      201309L <complex>
-__cpp_lib_concepts                          201806L <concepts>
-__cpp_lib_constexpr_swap_algorithms         201806L <algorithm>
-__cpp_lib_enable_shared_from_this           201603L <memory>
-__cpp_lib_erase_if                          201811L <string> <deque> <forward_list> <list> 
-                                                    <vector> <map> <set> <unordered_map> 
-                                                    <unordered_set>
-__cpp_lib_exchange_function                 201304L <utility>
-__cpp_lib_execution                         201603L <execution>
-__cpp_lib_filesystem                        201703L <filesystem>
-__cpp_lib_gcd_lcm                           201606L <numeric>
-__cpp_lib_generic_associative_lookup        201304L <map> <set>
-__cpp_lib_hardware_interference_size        201703L <new>
-__cpp_lib_has_unique_object_representations 201606L <type_traits>
-__cpp_lib_hypot                             201603L <cmath>
-__cpp_lib_incomplete_container_elements     201505L <forward_list> <list> <vector>
-__cpp_lib_integer_sequence                  201304L <utility>
-__cpp_lib_integral_constant_callable        201304L <type_traits>
-__cpp_lib_invoke                            201411L <functional>
-__cpp_lib_is_aggregate                      201703L <type_traits>
-__cpp_lib_is_final                          201402L <type_traits>
-__cpp_lib_is_invocable                      201703L <type_traits>
-__cpp_lib_is_null_pointer                   201309L <type_traits>
-__cpp_lib_is_swappable                      201603L <type_traits>
-__cpp_lib_launder                           201606L <new>
-__cpp_lib_list_remove_return_type           201806L <forward_list> <list>
-__cpp_lib_logical_traits                    201510L <type_traits>
-__cpp_lib_make_from_tuple                   201606L <tuple>
-__cpp_lib_make_reverse_iterator             201402L <iterator>
-__cpp_lib_make_unique                       201304L <memory>
-__cpp_lib_map_try_emplace                   201411L <map>
-__cpp_lib_math_special_functions            201603L <cmath>
-__cpp_lib_memory_resource                   201603L <memory_resource>
-__cpp_lib_node_extract                      201606L <map> <set> <unordered_map> <unordered_set>
-__cpp_lib_nonmember_container_access        201411L <iterator> <array> <deque> <forward_list>
-                                                    <list> <map> <regex> <set> <string>
-                                                    <unordered_map> <unordered_set> <vector>
-__cpp_lib_not_fn                            201603L <functional>
-__cpp_lib_null_iterators                    201304L <iterator>
-__cpp_lib_optional                          201606L <optional>
-__cpp_lib_parallel_algorithm                201603L <algorithm> <numeric>
-__cpp_lib_quoted_string_io                  201304L <iomanip>
-__cpp_lib_raw_memory_algorithms             201606L <memory>
-__cpp_lib_result_of_sfinae                  201210L <functional> <type_traits>
-__cpp_lib_robust_nonmodifying_seq_ops       201304L <algorithm>
-__cpp_lib_sample                            201603L <algorithm>
-__cpp_lib_scoped_lock                       201703L <mutex>
-__cpp_lib_shared_mutex                      201505L <shared_mutex>
-__cpp_lib_shared_ptr_arrays                 201611L <memory>
-__cpp_lib_shared_ptr_weak_type              201606L <memory>
-__cpp_lib_shared_timed_mutex                201402L <shared_mutex>
-__cpp_lib_string_udls                       201304L <string>
-__cpp_lib_string_view                       201606L <string> <string_view>
-__cpp_lib_to_chars                          201611L <charconv>
-__cpp_lib_transformation_trait_aliases      201304L <type_traits>
-__cpp_lib_transparent_operators             201510L <memory> <functional>
-__cpp_lib_tuple_element_t                   201402L <tuple>
-__cpp_lib_tuples_by_type                    201304L <utility> <tuple>
-__cpp_lib_type_trait_variable_templates     201510L <type_traits>
-__cpp_lib_uncaught_exceptions               201411L <exception>
-__cpp_lib_unordered_map_try_emplace         201411L <unordered_map>
-__cpp_lib_variant                           201606L <variant>
-__cpp_lib_void_t                            201411L <type_traits>
+Macro name                                              Value   Headers
+__cpp_lib_addressof_constexpr                           201603L <memory>
+__cpp_lib_allocator_traits_is_always_equal              201411L <memory> <scoped_allocator> <string>
+                                                                <deque> <forward_list> <list>
+                                                                <vector> <map> <set>
+                                                                <unordered_map> <unordered_set>
+__cpp_lib_any                                           201606L <any>
+__cpp_lib_apply                                         201603L <tuple>
+__cpp_lib_array_constexpr                               201603L <iterator> <array>
+__cpp_lib_as_const                                      201510L <utility>
+__cpp_lib_atomic_is_always_lock_free                    201603L <atomic>
+__cpp_lib_atomic_ref                                    201806L <atomic>
+__cpp_lib_bind_front                                    201811L <functional>
+__cpp_lib_bit_cast                                      201806L <bit>
+__cpp_lib_bool_constant                                 201505L <type_traits>
+__cpp_lib_boyer_moore_searcher                          201603L <functional>
+__cpp_lib_byte                                          201603L <cstddef>
+__cpp_lib_char8_t                                       201811L <atomic> <filesystem> <istream>
+                                                                <limits> <locale> <ostream>
+                                                                <string> <string_view>
+__cpp_lib_chrono                                        201611L <chrono>
+__cpp_lib_chrono_udls                                   201304L <chrono>
+__cpp_lib_clamp                                         201603L <algorithm>
+__cpp_lib_complex_udls                                  201309L <complex>
+__cpp_lib_concepts                                      201806L <concepts>
+__cpp_lib_constexpr_misc                                201811L <array> <functional> <iterator>
+                                                                <string_view> <tuple> <utility>
+__cpp_lib_constexpr_swap_algorithms                     201806L <algorithm>
+__cpp_lib_destroying_delete                             201806L <new>
+__cpp_lib_enable_shared_from_this                       201603L <memory>
+__cpp_lib_erase_if                                      201811L <string> <deque> <forward_list>
+                                                                <list> <vector> <map>
+                                                                <set> <unordered_map> <unordered_set>
+__cpp_lib_exchange_function                             201304L <utility>
+__cpp_lib_execution                                     201603L <execution>
+__cpp_lib_filesystem                                    201703L <filesystem>
+__cpp_lib_gcd_lcm                                       201606L <numeric>
+__cpp_lib_generic_associative_lookup                    201304L <map> <set>
+__cpp_lib_generic_unordered_lookup                      201811L <unordered_map> <unordered_set>
+__cpp_lib_hardware_interference_size                    201703L <new>
+__cpp_lib_has_unique_object_representations             201606L <type_traits>
+__cpp_lib_hypot                                         201603L <cmath>
+__cpp_lib_incomplete_container_elements                 201505L <forward_list> <list> <vector>
+__cpp_lib_integer_sequence                              201304L <utility>
+__cpp_lib_integral_constant_callable                    201304L <type_traits>
+__cpp_lib_invoke                                        201411L <functional>
+__cpp_lib_is_aggregate                                  201703L <type_traits>
+__cpp_lib_is_constant_evaluated                         201811L <type_traits>
+__cpp_lib_is_final                                      201402L <type_traits>
+__cpp_lib_is_invocable                                  201703L <type_traits>
+__cpp_lib_is_null_pointer                               201309L <type_traits>
+__cpp_lib_is_swappable                                  201603L <type_traits>
+__cpp_lib_launder                                       201606L <new>
+__cpp_lib_list_remove_return_type                       201806L <forward_list> <list>
+__cpp_lib_logical_traits                                201510L <type_traits>
+__cpp_lib_make_from_tuple                               201606L <tuple>
+__cpp_lib_make_reverse_iterator                         201402L <iterator>
+__cpp_lib_make_unique                                   201304L <memory>
+__cpp_lib_map_try_emplace                               201411L <map>
+__cpp_lib_math_special_functions                        201603L <cmath>
+__cpp_lib_memory_resource                               201603L <memory_resource>
+__cpp_lib_node_extract                                  201606L <map> <set> <unordered_map>
+                                                                <unordered_set>
+__cpp_lib_nonmember_container_access                    201411L <iterator> <array> <deque>
+                                                                <forward_list> <list> <map>
+                                                                <regex> <set> <string>
+                                                                <unordered_map> <unordered_set> <vector>
+__cpp_lib_not_fn                                        201603L <functional>
+__cpp_lib_null_iterators                                201304L <iterator>
+__cpp_lib_optional                                      201606L <optional>
+__cpp_lib_parallel_algorithm                            201603L <algorithm> <numeric>
+__cpp_lib_quoted_string_io                              201304L <iomanip>
+__cpp_lib_ranges                                        201811L <algorithm> <functional> <iterator>
+                                                                <memory> <ranges>
+__cpp_lib_raw_memory_algorithms                         201606L <memory>
+__cpp_lib_result_of_sfinae                              201210L <functional> <type_traits>
+__cpp_lib_robust_nonmodifying_seq_ops                   201304L <algorithm>
+__cpp_lib_sample                                        201603L <algorithm>
+__cpp_lib_scoped_lock                                   201703L <mutex>
+__cpp_lib_shared_mutex                                  201505L <shared_mutex>
+__cpp_lib_shared_ptr_arrays                             201611L <memory>
+__cpp_lib_shared_ptr_weak_type                          201606L <memory>
+__cpp_lib_shared_timed_mutex                            201402L <shared_mutex>
+__cpp_lib_string_udls                                   201304L <string>
+__cpp_lib_string_view                                   201606L <string> <string_view>
+__cpp_lib_three_way_comparison                          201711L <compare>
+__cpp_lib_to_chars                                      201611L <utility>
+__cpp_lib_transformation_trait_aliases                  201304L <type_traits>
+__cpp_lib_transparent_operators                         201510L <functional>
+                                                        201210L // C++14
+__cpp_lib_tuple_element_t                               201402L <tuple>
+__cpp_lib_tuples_by_type                                201304L <utility> <tuple>
+__cpp_lib_type_trait_variable_templates                 201510L <type_traits>
+__cpp_lib_uncaught_exceptions                           201411L <exception>
+__cpp_lib_unordered_map_try_emplace                     201411L <unordered_map>
+__cpp_lib_variant                                       201606L <variant>
+__cpp_lib_void_t                                        201411L <type_traits>
 
 */
 
@@ -108,21 +120,112 @@ __cpp_lib_void_t                            201411L <type_traits>
 #endif
 
 #if _LIBCPP_STD_VER > 11
+# define __cpp_lib_chrono_udls                          201304L
+# define __cpp_lib_complex_udls                         201309L
+# define __cpp_lib_exchange_function                    201304L
+# define __cpp_lib_generic_associative_lookup           201304L
+# define __cpp_lib_integer_sequence                     201304L
+# define __cpp_lib_integral_constant_callable           201304L
+# define __cpp_lib_is_final                             201402L
+# define __cpp_lib_is_null_pointer                      201309L
+# define __cpp_lib_make_reverse_iterator                201402L
+# define __cpp_lib_make_unique                          201304L
+# define __cpp_lib_null_iterators                       201304L
+# define __cpp_lib_quoted_string_io                     201304L
+# define __cpp_lib_result_of_sfinae                     201210L
+# define __cpp_lib_robust_nonmodifying_seq_ops          201304L
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   define __cpp_lib_shared_timed_mutex                 201402L
+# endif
+# define __cpp_lib_string_udls                          201304L
+# define __cpp_lib_transformation_trait_aliases         201304L
+# define __cpp_lib_transparent_operators                201210L
+# define __cpp_lib_tuple_element_t                      201402L
+# define __cpp_lib_tuples_by_type                       201304L
 #endif
 
 #if _LIBCPP_STD_VER > 14
-# define __cpp_lib_atomic_is_always_lock_free           201603L
+# if !defined(_LIBCPP_HAS_NO_BUILTIN_ADDRESSOF)
+#   define __cpp_lib_addressof_constexpr                201603L
+# endif
+# define __cpp_lib_allocator_traits_is_always_equal     201411L
+# define __cpp_lib_any                                  201606L
+# define __cpp_lib_apply                                201603L
+# define __cpp_lib_array_constexpr                      201603L
+# define __cpp_lib_as_const                             201510L
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   define __cpp_lib_atomic_is_always_lock_free         201603L
+# endif
+# define __cpp_lib_bool_constant                        201505L
+// # define __cpp_lib_boyer_moore_searcher                 201603L
+# define __cpp_lib_byte                                 201603L
+# define __cpp_lib_chrono                               201611L
+# define __cpp_lib_clamp                                201603L
+# define __cpp_lib_enable_shared_from_this              201603L
+// # define __cpp_lib_execution                            201603L
 # define __cpp_lib_filesystem                           201703L
+# define __cpp_lib_gcd_lcm                              201606L
+# define __cpp_lib_hardware_interference_size           201703L
+# if defined(_LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS)
+#   define __cpp_lib_has_unique_object_representations  201606L
+# endif
+# define __cpp_lib_hypot                                201603L
+# define __cpp_lib_incomplete_container_elements        201505L
 # define __cpp_lib_invoke                               201411L
-# define __cpp_lib_void_t                               201411L
+# if !defined(_LIBCPP_HAS_NO_IS_AGGREGATE)
+#   define __cpp_lib_is_aggregate                       201703L
+# endif
+# define __cpp_lib_is_invocable                         201703L
+# define __cpp_lib_is_swappable                         201603L
+# define __cpp_lib_launder                              201606L
+# define __cpp_lib_logical_traits                       201510L
+# define __cpp_lib_make_from_tuple                      201606L
+# define __cpp_lib_map_try_emplace                      201411L
+// # define __cpp_lib_math_special_functions               201603L
+// # define __cpp_lib_memory_resource                      201603L
 # define __cpp_lib_node_extract                         201606L
+# define __cpp_lib_nonmember_container_access           201411L
+# define __cpp_lib_not_fn                               201603L
+# define __cpp_lib_optional                             201606L
+// # define __cpp_lib_parallel_algorithm                   201603L
+# define __cpp_lib_raw_memory_algorithms                201606L
+# define __cpp_lib_sample                               201603L
+# define __cpp_lib_scoped_lock                          201703L
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   define __cpp_lib_shared_mutex                       201505L
+# endif
+// # define __cpp_lib_shared_ptr_arrays                    201611L
+# define __cpp_lib_shared_ptr_weak_type                 201606L
+# define __cpp_lib_string_view                          201606L
+// # define __cpp_lib_to_chars                             201611L
+# undef  __cpp_lib_transparent_operators
+# define __cpp_lib_transparent_operators                201510L
+# define __cpp_lib_type_trait_variable_templates        201510L
+# define __cpp_lib_uncaught_exceptions                  201411L
+# define __cpp_lib_unordered_map_try_emplace            201411L
+# define __cpp_lib_variant                              201606L
+# define __cpp_lib_void_t                               201411L
 #endif
 
 #if _LIBCPP_STD_VER > 17
-#ifndef _LIBCPP_NO_HAS_CHAR8_T
-# define __cpp_lib_char8_t                              201811L
-#endif
-#define  __cpp_lib_erase_if                             201811L
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+// #   define __cpp_lib_atomic_ref                         201806L
+# endif
+// # define __cpp_lib_bind_front                           201811L
+// # define __cpp_lib_bit_cast                             201806L
+# if !defined(_LIBCPP_NO_HAS_CHAR8_T)
+#   define __cpp_lib_char8_t                            201811L
+# endif
+// # define __cpp_lib_concepts                             201806L
+// # define __cpp_lib_constexpr_misc                       201811L
+// # define __cpp_lib_constexpr_swap_algorithms            201806L
+// # define __cpp_lib_destroying_delete                    201806L
+# define __cpp_lib_erase_if                             201811L
+// # define __cpp_lib_generic_unordered_lookup             201811L
+// # define __cpp_lib_is_constant_evaluated                201811L
+// # define __cpp_lib_list_remove_return_type              201806L
+// # define __cpp_lib_ranges                               201811L
+// # define __cpp_lib_three_way_comparison                 201711L
 #endif
 
-#endif  // _LIBCPP_VERSIONH
+#endif // _LIBCPP_VERSIONH
diff --git a/include/wchar.h b/include/wchar.h
index f74fe6ddc..353c979d2 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- wchar.h ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/include/wctype.h b/include/wctype.h
index f9c5a4775..bdcf37234 100644
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- wctype.h ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 354da21a5..e5313f159 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -175,46 +175,73 @@ endif()
 split_list(LIBCXX_COMPILE_FLAGS)
 split_list(LIBCXX_LINK_FLAGS)
 
-# Add an object library that contains the compiled source files.
-add_library(cxx_objects OBJECT ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
-if(LIBCXX_CXX_ABI_HEADER_TARGET)
-  add_dependencies(cxx_objects ${LIBCXX_CXX_ABI_HEADER_TARGET})
-endif()
-if(WIN32 AND NOT MINGW)
-  target_compile_definitions(cxx_objects
-                             PRIVATE
-                               # Ignore the -MSC_VER mismatch, as we may build
-                               # with a different compatibility version.
-                               _ALLOW_MSC_VER_MISMATCH
-                               # Don't check the msvcprt iterator debug levels
-                               # as we will define the iterator types; libc++
-                               # uses a different macro to identify the debug
-                               # level.
-                               _ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH
-                               # We are building the c++ runtime, don't pull in
-                               # msvcprt.
-                               _CRTBLD
-                               # Don't warn on the use of "deprecated"
-                               # "insecure" functions which are standards
-                               # specified.
-                               _CRT_SECURE_NO_WARNINGS
-                               # Use the ISO conforming behaviour for conversion
-                               # in printf, scanf.
-                               _CRT_STDIO_ISO_WIDE_SPECIFIERS)
-endif()
+macro(cxx_object_library name)
+  cmake_parse_arguments(ARGS "" "" "DEFINES;FLAGS" ${ARGN})
+
+  # Add an object library that contains the compiled source files.
+  add_library(${name} OBJECT ${exclude_from_all} ${LIBCXX_SOURCES} ${LIBCXX_HEADERS})
+  if(LIBCXX_CXX_ABI_HEADER_TARGET)
+    add_dependencies(${name} ${LIBCXX_CXX_ABI_HEADER_TARGET})
+  endif()
+  if(WIN32 AND NOT MINGW)
+    target_compile_definitions(${name}
+                               PRIVATE
+                                 # Ignore the -MSC_VER mismatch, as we may build
+                                 # with a different compatibility version.
+                                 _ALLOW_MSC_VER_MISMATCH
+                                 # Don't check the msvcprt iterator debug levels
+                                 # as we will define the iterator types; libc++
+                                 # uses a different macro to identify the debug
+                                 # level.
+                                 _ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH
+                                 # We are building the c++ runtime, don't pull in
+                                 # msvcprt.
+                                 _CRTBLD
+                                 # Don't warn on the use of "deprecated"
+                                 # "insecure" functions which are standards
+                                 # specified.
+                                 _CRT_SECURE_NO_WARNINGS
+                                 # Use the ISO conforming behaviour for conversion
+                                 # in printf, scanf.
+                                 _CRT_STDIO_ISO_WIDE_SPECIFIERS)
+  endif()
 
-set_target_properties(cxx_objects
-  PROPERTIES
-    COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}"
-)
+  if(ARGS_DEFINES)
+    target_compile_definitions(${name} PRIVATE ${ARGS_DEFINES})
+  endif()
+
+  set_target_properties(${name}
+    PROPERTIES
+      COMPILE_FLAGS ${LIBCXX_COMPILE_FLAGS}
+  )
+
+  if(ARGS_FLAGS)
+    target_compile_options(${name} PRIVATE ${ARGS_FLAGS})
+  endif()
+endmacro()
+
+if(LIBCXX_HERMETIC_STATIC_LIBRARY)
+  append_flags_if_supported(CXX_STATIC_OBJECTS_FLAGS -fvisibility=hidden)
+  append_flags_if_supported(CXX_STATIC_OBJECTS_FLAGS -fvisibility-global-new-delete-hidden)
+  cxx_object_library(cxx_static_objects
+    DEFINES _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS
+    FLAGS ${CXX_STATIC_OBJECTS_FLAGS})
+  cxx_object_library(cxx_shared_objects)
+  set(cxx_static_sources $<TARGET_OBJECTS:cxx_static_objects>)
+  set(cxx_shared_sources $<TARGET_OBJECTS:cxx_shared_objects>)
+else()
+  cxx_object_library(cxx_objects)
+  set(cxx_static_sources $<TARGET_OBJECTS:cxx_objects>)
+  set(cxx_shared_sources $<TARGET_OBJECTS:cxx_objects>)
+endif()
 
 # Build the shared library.
 if (LIBCXX_ENABLE_SHARED)
-  add_library(cxx_shared SHARED $<TARGET_OBJECTS:cxx_objects>)
+  add_library(cxx_shared SHARED ${cxx_shared_sources})
   if(COMMAND llvm_setup_rpath)
     llvm_setup_rpath(cxx_shared)
   endif()
-  target_link_libraries(cxx_shared ${LIBCXX_LIBRARIES})
+  target_link_libraries(cxx_shared PRIVATE ${LIBCXX_LIBRARIES})
   set_target_properties(cxx_shared
     PROPERTIES
       LINK_FLAGS    "${LIBCXX_LINK_FLAGS}"
@@ -237,8 +264,8 @@ endif()
 
 # Build the static library.
 if (LIBCXX_ENABLE_STATIC)
-  add_library(cxx_static STATIC $<TARGET_OBJECTS:cxx_objects>)
-  target_link_libraries(cxx_static ${LIBCXX_LIBRARIES})
+  add_library(cxx_static STATIC ${cxx_static_sources})
+  target_link_libraries(cxx_static PRIVATE ${LIBCXX_LIBRARIES})
   set(CMAKE_STATIC_LIBRARY_PREFIX "lib")
   set_target_properties(cxx_static
     PROPERTIES
@@ -301,7 +328,7 @@ if (LIBCXX_ENABLE_FILESYSTEM)
 
   set(filesystem_flags "${LIBCXX_COMPILE_FLAGS}")
   check_flag_supported(-std=c++14)
-  if (NOT MSVC AND LIBCXX_SUPPORTS_STD_EQ_CXX14_FLAG)
+  if (NOT MSVC AND LIBCXX_SUPPORTS_STD_EQ_CXX14_FLAG AND LIBCXX_STANDARD_VER STREQUAL "c++11")
     string(REPLACE "-std=c++11" "-std=c++14" filesystem_flags "${LIBCXX_COMPILE_FLAGS}")
   endif()
   set_target_properties(cxx_filesystem
@@ -434,3 +461,8 @@ if (NOT CMAKE_CONFIGURATION_TYPES AND (LIBCXX_INSTALL_LIBRARY OR
                       -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
     add_custom_target(install-libcxx DEPENDS install-cxx)
 endif()
+
+# TODO: This is needed by cxx-benchmarks but this variable isn't
+# available outside of the scope of this file so we need to export
+# it. This is not necessarily the cleanest solution.
+set(LIBCXX_LIBRARIES ${LIBCXX_LIBRARIES} PARENT_SCOPE)
diff --git a/lib/abi/8.0/x86_64-apple-darwin.v1.abilist b/lib/abi/8.0/x86_64-apple-darwin.v1.abilist
new file mode 100644
index 000000000..65a034961
--- /dev/null
+++ b/lib/abi/8.0/x86_64-apple-darwin.v1.abilist
@@ -0,0 +1,2360 @@
+{'type': 'U', 'is_defined': False, 'name': '__ZNKSt10bad_typeid4whatEv'}
+{'type': 'I', 'is_defined': True, 'name': '__ZNKSt10bad_typeid4whatEv'}
+{'type': 'U', 'is_defined': False, 'name': '__ZNKSt11logic_error4whatEv'}
+{'type': 'I', 'is_defined': True, 'name': '__ZNKSt11logic_error4whatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt12bad_any_cast4whatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt12experimental15fundamentals_v112bad_any_cast4whatEv'}
+{'type': 'U', 'is_defined': False, 'name': '__ZNKSt13bad_exception4whatEv'}
+{'type': 'I', 'is_defined': True, 'name': '__ZNKSt13bad_exception4whatEv'}
+{'type': 'U', 'is_defined': False, 'name': '__ZNKSt13runtime_error4whatEv'}
+{'type': 'I', 'is_defined': True, 'name': '__ZNKSt13runtime_error4whatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt16nested_exception14rethrow_nestedEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt18bad_variant_access4whatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt19bad_optional_access4whatEv'}
+{'type': 'U', 'is_defined': False, 'name': '__ZNKSt20bad_array_new_length4whatEv'}
+{'type': 'I', 'is_defined': True, 'name': '__ZNKSt20bad_array_new_length4whatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110__time_put8__do_putEPcRS1_PK2tmcc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110__time_put8__do_putEPwRS1_PK2tmcc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110error_code7messageEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE11do_groupingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE13do_neg_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE13do_pos_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE14do_curr_symbolEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE14do_frac_digitsEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_decimal_pointEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_negative_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_positive_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_thousands_sepEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE11do_groupingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE13do_neg_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE13do_pos_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE14do_curr_symbolEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE14do_frac_digitsEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_decimal_pointEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_negative_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_positive_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_thousands_sepEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE11do_groupingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE13do_neg_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE13do_pos_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE14do_curr_symbolEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE14do_frac_digitsEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_decimal_pointEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_negative_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_positive_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb0EE16do_thousands_sepEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE11do_groupingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE13do_neg_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE13do_pos_formatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE14do_curr_symbolEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE14do_frac_digitsEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_decimal_pointEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_negative_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_positive_signEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIwLb1EE16do_thousands_sepEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db15__decrementableEPKv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db15__find_c_from_iEPv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db15__subscriptableEPKvl'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db17__dereferenceableEPKv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db17__find_c_and_lockEPv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db22__less_than_comparableEPKvS2_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db6unlockEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db8__find_cEPv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__111__libcpp_db9__addableEPKvl'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112bad_weak_ptr4whatEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE12find_last_ofEPKcmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE13find_first_ofEPKcmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE16find_last_not_ofEPKcmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE17find_first_not_ofEPKcmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE2atEm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4copyEPcmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4findEPKcmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4findEcm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE5rfindEPKcmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE5rfindEcm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEPKc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmPKc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmPKcm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmRKS5_mm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE12find_last_ofEPKwmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE13find_first_ofEPKwmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE16find_last_not_ofEPKwmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE17find_first_not_ofEPKwmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE2atEm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE4copyEPwmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE4findEPKwmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE4findEwm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE5rfindEPKwmm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE5rfindEwm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEPKw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEmmPKw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEmmPKwm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEmmRKS5_mm'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIcE10do_tolowerEPcPKc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIcE10do_tolowerEc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIcE10do_toupperEPcPKc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIcE10do_toupperEc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE10do_scan_isEjPKwS3_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE10do_tolowerEPwPKw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE10do_tolowerEw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE10do_toupperEPwPKw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE10do_toupperEw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE11do_scan_notEjPKwS3_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE5do_isEPKwS3_Pj'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE5do_isEjw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE8do_widenEPKcS3_Pw'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE8do_widenEc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE9do_narrowEPKwS3_cPc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112ctype_bynameIwE9do_narrowEwc'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__112strstreambuf6pcountEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__113random_device7entropyEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDiE10do_unshiftER11__mbstate_tPcS4_RS4_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDiE11do_encodingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDiE13do_max_lengthEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDiE16do_always_noconvEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDiE5do_inER11__mbstate_tPKcS5_RS5_PDiS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDiE6do_outER11__mbstate_tPKDiS5_RS5_PcS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDiE9do_lengthER11__mbstate_tPKcS5_m'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDsE10do_unshiftER11__mbstate_tPcS4_RS4_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDsE11do_encodingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDsE13do_max_lengthEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDsE16do_always_noconvEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDsE5do_inER11__mbstate_tPKcS5_RS5_PDsS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDsE6do_outER11__mbstate_tPKDsS5_RS5_PcS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IDsE9do_lengthER11__mbstate_tPKcS5_m'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IwE10do_unshiftER11__mbstate_tPcS4_RS4_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IwE11do_encodingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IwE13do_max_lengthEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IwE16do_always_noconvEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IwE5do_inER11__mbstate_tPKcS5_RS5_PwS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IwE6do_outER11__mbstate_tPKwS5_RS5_PcS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114__codecvt_utf8IwE9do_lengthER11__mbstate_tPKcS5_m'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114collate_bynameIcE10do_compareEPKcS3_S3_S3_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114collate_bynameIcE12do_transformEPKcS3_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114collate_bynameIwE10do_compareEPKwS3_S3_S3_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114collate_bynameIwE12do_transformEPKwS3_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114error_category10equivalentERKNS_10error_codeEi'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114error_category10equivalentEiRKNS_15error_conditionE'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__114error_category23default_error_conditionEi'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb0EE10do_unshiftER11__mbstate_tPcS4_RS4_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb0EE11do_encodingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb0EE13do_max_lengthEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb0EE16do_always_noconvEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb0EE5do_inER11__mbstate_tPKcS5_RS5_PDiS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb0EE6do_outER11__mbstate_tPKDiS5_RS5_PcS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb0EE9do_lengthER11__mbstate_tPKcS5_m'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb1EE10do_unshiftER11__mbstate_tPcS4_RS4_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb1EE11do_encodingEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb1EE13do_max_lengthEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb1EE16do_always_noconvEv'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb1EE5do_inER11__mbstate_tPKcS5_RS5_PDiS7_RS7_'}
+{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IDiLb1EE6do_outER11__mbstate_tPKDiS5_RS5_PcS7_RS7_'}
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new file mode 100644
index 000000000..5880a3bfd
--- /dev/null
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+{'type': 'I', 'is_defined': True, 'name': '___cxa_vec_delete3'}
+{'type': 'U', 'is_defined': False, 'name': '___cxa_vec_dtor'}
+{'type': 'I', 'is_defined': True, 'name': '___cxa_vec_dtor'}
+{'type': 'U', 'is_defined': False, 'name': '___cxa_vec_new'}
+{'type': 'I', 'is_defined': True, 'name': '___cxa_vec_new'}
+{'type': 'U', 'is_defined': False, 'name': '___cxa_vec_new2'}
+{'type': 'I', 'is_defined': True, 'name': '___cxa_vec_new2'}
+{'type': 'U', 'is_defined': False, 'name': '___cxa_vec_new3'}
+{'type': 'I', 'is_defined': True, 'name': '___cxa_vec_new3'}
+{'type': 'U', 'is_defined': False, 'name': '___dynamic_cast'}
+{'type': 'I', 'is_defined': True, 'name': '___dynamic_cast'}
+{'type': 'U', 'is_defined': False, 'name': '___gxx_personality_v0'}
+{'type': 'I', 'is_defined': True, 'name': '___gxx_personality_v0'}
diff --git a/lib/abi/8.0/x86_64-unknown-linux-gnu.v1.abilist b/lib/abi/8.0/x86_64-unknown-linux-gnu.v1.abilist
new file mode 100644
index 000000000..0be9eb2fc
--- /dev/null
+++ b/lib/abi/8.0/x86_64-unknown-linux-gnu.v1.abilist
@@ -0,0 +1,1861 @@
+{'name': '_ZNKSt11logic_error4whatEv', 'is_defined': False, 'type': 'FUNC'}
+{'name': '_ZNKSt12bad_any_cast4whatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt12experimental15fundamentals_v112bad_any_cast4whatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt13runtime_error4whatEv', 'is_defined': False, 'type': 'FUNC'}
+{'name': '_ZNKSt16nested_exception14rethrow_nestedEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt18bad_variant_access4whatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt19bad_optional_access4whatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110__time_put8__do_putEPcRS1_PK2tmcc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110__time_put8__do_putEPwRS1_PK2tmcc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110error_code7messageEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE11do_groupingEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE13do_neg_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE13do_pos_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE14do_curr_symbolEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE14do_frac_digitsEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE16do_decimal_pointEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE16do_negative_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE16do_positive_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb0EE16do_thousands_sepEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE11do_groupingEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE13do_neg_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE13do_pos_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE14do_curr_symbolEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE14do_frac_digitsEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE16do_decimal_pointEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE16do_negative_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE16do_positive_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIcLb1EE16do_thousands_sepEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE11do_groupingEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE13do_neg_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE13do_pos_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE14do_curr_symbolEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE14do_frac_digitsEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE16do_decimal_pointEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE16do_negative_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE16do_positive_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb0EE16do_thousands_sepEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE11do_groupingEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE13do_neg_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE13do_pos_formatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE14do_curr_symbolEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE14do_frac_digitsEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE16do_decimal_pointEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE16do_negative_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE16do_positive_signEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__110moneypunctIwLb1EE16do_thousands_sepEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db15__decrementableEPKv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db15__find_c_from_iEPv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db15__subscriptableEPKvl', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db17__dereferenceableEPKv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db17__find_c_and_lockEPv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db22__less_than_comparableEPKvS2_', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db6unlockEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db8__find_cEPv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__111__libcpp_db9__addableEPKvl', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112bad_weak_ptr4whatEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE12find_last_ofEPKcmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE13find_first_ofEPKcmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE16find_last_not_ofEPKcmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE17find_first_not_ofEPKcmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE2atEm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4copyEPcmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4findEPKcmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE4findEcm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE5rfindEPKcmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE5rfindEcm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEPKc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmPKc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmPKcm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmRKS5_mm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE12find_last_ofEPKwmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE13find_first_ofEPKwmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE16find_last_not_ofEPKwmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE17find_first_not_ofEPKwmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE2atEm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE4copyEPwmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE4findEPKwmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE4findEwm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE5rfindEPKwmm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE5rfindEwm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEPKw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEmmPKw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEmmPKwm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE7compareEmmRKS5_mm', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIcE10do_tolowerEPcPKc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIcE10do_tolowerEc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIcE10do_toupperEPcPKc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIcE10do_toupperEc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE10do_scan_isEtPKwS3_', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE10do_tolowerEPwPKw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE10do_tolowerEw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE10do_toupperEPwPKw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE10do_toupperEw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE11do_scan_notEtPKwS3_', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE5do_isEPKwS3_Pt', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE5do_isEtw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE8do_widenEPKcS3_Pw', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE8do_widenEc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE9do_narrowEPKwS3_cPc', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__112ctype_bynameIwE9do_narrowEwc', 'is_defined': True, 'type': 'FUNC'}
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+{'name': '_ZNKSt3__113random_device7entropyEv', 'is_defined': True, 'type': 'FUNC'}
+{'name': '_ZNKSt3__114__codecvt_utf8IDiE10do_unshiftER11__mbstate_tPcS4_RS4_', 'is_defined': True, 'type': 'FUNC'}
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+{'name': '_ZNKSt3__114collate_bynameIwE10do_compareEPKwS3_S3_S3_', 'is_defined': True, 'type': 'FUNC'}
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diff --git a/lib/abi/CHANGELOG.TXT b/lib/abi/CHANGELOG.TXT
index 38dffd290..95bdb714e 100644
--- a/lib/abi/CHANGELOG.TXT
+++ b/lib/abi/CHANGELOG.TXT
@@ -16,7 +16,7 @@ New entries should be added directly below the "Version" header.
 Version 8.0
 -----------
 
-* rXXXXX - Remove std::bad_array_length
+* r347903 - Remove std::bad_array_length
 
   The change removes the definition of std::bad_array_length (which never made
   it into the standard) from the headers and the dylib. This is technically an
diff --git a/lib/abi/x86_64-apple-darwin.v1.abilist b/lib/abi/x86_64-apple-darwin.v1.abilist
index 65a034961..6349acf05 100644
--- a/lib/abi/x86_64-apple-darwin.v1.abilist
+++ b/lib/abi/x86_64-apple-darwin.v1.abilist
@@ -1,2360 +1,2360 @@
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-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt18bad_variant_access4whatEv'}
-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt19bad_optional_access4whatEv'}
-{'type': 'U', 'is_defined': False, 'name': '__ZNKSt20bad_array_new_length4whatEv'}
-{'type': 'I', 'is_defined': True, 'name': '__ZNKSt20bad_array_new_length4whatEv'}
-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110__time_put8__do_putEPcRS1_PK2tmcc'}
-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110__time_put8__do_putEPwRS1_PK2tmcc'}
-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110error_code7messageEv'}
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-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb0EE16do_thousands_sepEv'}
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-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE13do_neg_formatEv'}
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-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE14do_curr_symbolEv'}
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-{'type': 'FUNC', 'is_defined': True, 'name': '__ZNKSt3__110moneypunctIcLb1EE16do_thousands_sepEv'}
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index 5880a3bfd..adabbf6e0 100644
--- a/lib/abi/x86_64-apple-darwin.v2.abilist
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diff --git a/lib/abi/x86_64-unknown-linux-gnu.v1.abilist b/lib/abi/x86_64-unknown-linux-gnu.v1.abilist
index 0be9eb2fc..8a31ff82a 100644
--- a/lib/abi/x86_64-unknown-linux-gnu.v1.abilist
+++ b/lib/abi/x86_64-unknown-linux-gnu.v1.abilist
@@ -1,1861 +1,1861 @@
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-{'name': '_ZNKSt3__110moneypunctIwLb0EE13do_pos_formatEv', 'is_defined': True, 'type': 'FUNC'}
-{'name': '_ZNKSt3__110moneypunctIwLb0EE14do_curr_symbolEv', 'is_defined': True, 'type': 'FUNC'}
-{'name': '_ZNKSt3__110moneypunctIwLb0EE14do_frac_digitsEv', 'is_defined': True, 'type': 'FUNC'}
-{'name': '_ZNKSt3__110moneypunctIwLb0EE16do_decimal_pointEv', 'is_defined': True, 'type': 'FUNC'}
-{'name': '_ZNKSt3__110moneypunctIwLb0EE16do_negative_signEv', 'is_defined': True, 'type': 'FUNC'}
-{'name': '_ZNKSt3__110moneypunctIwLb0EE16do_positive_signEv', 'is_defined': True, 'type': 'FUNC'}
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-{'name': '_ZNKSt3__110moneypunctIwLb1EE16do_positive_signEv', 'is_defined': True, 'type': 'FUNC'}
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+{'is_defined': False, 'name': '__cxa_decrement_exception_refcount', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_end_catch', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_free_exception', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_guard_abort', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_guard_acquire', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_guard_release', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_increment_exception_refcount', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_pure_virtual', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_rethrow', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_rethrow_primary_exception', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_throw', 'type': 'FUNC'}
+{'is_defined': False, 'name': '__cxa_uncaught_exceptions', 'type': 'FUNC'}
diff --git a/src/algorithm.cpp b/src/algorithm.cpp
index f036eb7ab..28e452f52 100644
--- a/src/algorithm.cpp
+++ b/src/algorithm.cpp
@@ -1,9 +1,8 @@
 //===----------------------- algorithm.cpp --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/any.cpp b/src/any.cpp
index 3795258bb..0cf090688 100644
--- a/src/any.cpp
+++ b/src/any.cpp
@@ -1,9 +1,8 @@
 //===---------------------------- any.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/bind.cpp b/src/bind.cpp
index b4c76ffe6..53efdf9df 100644
--- a/src/bind.cpp
+++ b/src/bind.cpp
@@ -1,9 +1,8 @@
 //===-------------------------- bind.cpp ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/charconv.cpp b/src/charconv.cpp
index ec241db74..6ea473b25 100644
--- a/src/charconv.cpp
+++ b/src/charconv.cpp
@@ -1,9 +1,8 @@
 //===------------------------- charconv.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/chrono.cpp b/src/chrono.cpp
index 882d50b9d..ea0a638ac 100644
--- a/src/chrono.cpp
+++ b/src/chrono.cpp
@@ -1,9 +1,8 @@
 //===------------------------- chrono.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/condition_variable.cpp b/src/condition_variable.cpp
index 2200aefb8..4022ff2e9 100644
--- a/src/condition_variable.cpp
+++ b/src/condition_variable.cpp
@@ -1,9 +1,8 @@
 //===-------------------- condition_variable.cpp --------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/debug.cpp b/src/debug.cpp
index f2fc1ceb4..2e88b859b 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -1,9 +1,8 @@
 //===-------------------------- debug.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/exception.cpp b/src/exception.cpp
index 3d2dcfd5b..ee9f384b6 100644
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -1,9 +1,8 @@
 //===------------------------ exception.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/experimental/memory_resource.cpp b/src/experimental/memory_resource.cpp
index 7f0052f2b..977ee2b56 100644
--- a/src/experimental/memory_resource.cpp
+++ b/src/experimental/memory_resource.cpp
@@ -1,9 +1,8 @@
 //===------------------------ memory_resource.cpp -------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/filesystem/directory_iterator.cpp b/src/filesystem/directory_iterator.cpp
index f0d807a03..ca88dee06 100644
--- a/src/filesystem/directory_iterator.cpp
+++ b/src/filesystem/directory_iterator.cpp
@@ -1,9 +1,8 @@
 //===------------------ directory_iterator.cpp ----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,6 +24,8 @@ namespace detail {
 namespace {
 
 #if !defined(_LIBCPP_WIN32API)
+
+#if defined(DT_BLK)
 template <class DirEntT, class = decltype(DirEntT::d_type)>
 static file_type get_file_type(DirEntT* ent, int) {
   switch (ent->d_type) {
@@ -50,6 +51,7 @@ static file_type get_file_type(DirEntT* ent, int) {
   }
   return file_type::none;
 }
+#endif // defined(DT_BLK)
 
 template <class DirEntT>
 static file_type get_file_type(DirEntT* ent, long) {
diff --git a/src/filesystem/filesystem_common.h b/src/filesystem/filesystem_common.h
index 40419ee35..fe5c42f5e 100644
--- a/src/filesystem/filesystem_common.h
+++ b/src/filesystem/filesystem_common.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===////
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===////
 
diff --git a/src/filesystem/int128_builtins.cpp b/src/filesystem/int128_builtins.cpp
index 66adbdd2d..a55540fe2 100644
--- a/src/filesystem/int128_builtins.cpp
+++ b/src/filesystem/int128_builtins.cpp
@@ -1,9 +1,8 @@
 /*===-- int128_builtins.cpp - Implement __muloti4 --------------------------===
  *
- *                     The LLVM Compiler Infrastructure
- *
- * This file is dual licensed under the MIT and the University of Illinois Open
- * Source Licenses. See LICENSE.TXT for details.
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  *
  * ===----------------------------------------------------------------------===
  *
diff --git a/src/filesystem/operations.cpp b/src/filesystem/operations.cpp
index c9396b59c..5ba979ca9 100644
--- a/src/filesystem/operations.cpp
+++ b/src/filesystem/operations.cpp
@@ -1,9 +1,8 @@
 //===--------------------- filesystem/ops.cpp -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -206,8 +205,20 @@ public:
     return *this;
   }
 
+  bool atEnd() const noexcept {
+    return State == PS_AtEnd;
+  }
+
+  bool inRootDir() const noexcept {
+    return State == PS_InRootDir;
+  }
+
+  bool inRootName() const noexcept {
+    return State == PS_InRootName;
+  }
+
   bool inRootPath() const noexcept {
-    return State == PS_InRootDir || State == PS_InRootName;
+    return inRootName() || inRootDir();
   }
 
 private:
@@ -427,7 +438,8 @@ file_status posix_lstat(path const& p, error_code* ec) {
   return posix_lstat(p, path_stat, ec);
 }
 
-bool posix_ftruncate(const FileDescriptor& fd, size_t to_size, error_code& ec) {
+// http://pubs.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html
+bool posix_ftruncate(const FileDescriptor& fd, off_t to_size, error_code& ec) {
   if (::ftruncate(fd.fd, to_size) == -1) {
     ec = capture_errno();
     return true;
@@ -530,11 +542,19 @@ path __canonical(path const& orig_p, error_code* ec) {
   ErrorHandler<path> err("canonical", ec, &orig_p, &cwd);
 
   path p = __do_absolute(orig_p, &cwd, ec);
+#if _POSIX_VERSION >= 200112
+  std::unique_ptr<char, decltype(&::free)>
+    hold(::realpath(p.c_str(), nullptr), &::free);
+  if (hold.get() == nullptr)
+    return err.report(capture_errno());
+  return {hold.get()};
+#else
   char buff[PATH_MAX + 1];
   char* ret;
   if ((ret = ::realpath(p.c_str(), buff)) == nullptr)
     return err.report(capture_errno());
   return {ret};
+#endif
 }
 
 void __copy(const path& from, const path& to, copy_options options,
@@ -1076,16 +1096,27 @@ void __permissions(const path& p, perms prms, perm_options opts,
 path __read_symlink(const path& p, error_code* ec) {
   ErrorHandler<path> err("read_symlink", ec, &p);
 
-  char buff[PATH_MAX + 1];
-  error_code m_ec;
-  ::ssize_t ret;
-  if ((ret = ::readlink(p.c_str(), buff, PATH_MAX)) == -1) {
+#ifdef PATH_MAX
+  struct NullDeleter { void operator()(void*) const {} };
+  const size_t size = PATH_MAX + 1;
+  char stack_buff[size];
+  auto buff = std::unique_ptr<char[], NullDeleter>(stack_buff);
+#else
+  StatT sb;
+  if (::lstat(p.c_str(), &sb) == -1) {
     return err.report(capture_errno());
   }
-  _LIBCPP_ASSERT(ret <= PATH_MAX, "TODO");
+  const size_t size = sb.st_size + 1;
+  auto buff = unique_ptr<char[]>(new char[size]);
+#endif
+  ::ssize_t ret;
+  if ((ret = ::readlink(p.c_str(), buff.get(), size)) == -1)
+    return err.report(capture_errno());
   _LIBCPP_ASSERT(ret > 0, "TODO");
+  if (static_cast<size_t>(ret) >= size)
+    return err.report(errc::value_too_large);
   buff[ret] = 0;
-  return {buff};
+  return {buff.get()};
 }
 
 bool __remove(const path& p, error_code* ec) {
@@ -1294,7 +1325,19 @@ string_view_t path::__root_path_raw() const {
   return {};
 }
 
+static bool ConsumeRootName(PathParser *PP) {
+  static_assert(PathParser::PS_BeforeBegin == 1 &&
+      PathParser::PS_InRootName == 2,
+      "Values for enums are incorrect");
+  while (PP->State <= PathParser::PS_InRootName)
+    ++(*PP);
+  return PP->State == PathParser::PS_AtEnd;
+}
+
 static bool ConsumeRootDir(PathParser* PP) {
+  static_assert(PathParser::PS_BeforeBegin == 1 &&
+                PathParser::PS_InRootName == 2 &&
+                PathParser::PS_InRootDir == 3, "Values for enums are incorrect");
   while (PP->State <= PathParser::PS_InRootDir)
     ++(*PP);
   return PP->State == PathParser::PS_AtEnd;
@@ -1454,7 +1497,7 @@ static int DetermineLexicalElementCount(PathParser PP) {
     auto Elem = *PP;
     if (Elem == "..")
       --Count;
-    else if (Elem != ".")
+    else if (Elem != "." && Elem != "")
       ++Count;
   }
   return Count;
@@ -1468,8 +1511,7 @@ path path::lexically_relative(const path& base) const {
       return PP.State != PPBase.State &&
              (PP.inRootPath() || PPBase.inRootPath());
     };
-    if (PP.State == PathParser::PS_InRootName &&
-        PPBase.State == PathParser::PS_InRootName) {
+    if (PP.inRootName() && PPBase.inRootName()) {
       if (*PP != *PPBase)
         return {};
     } else if (CheckIterMismatchAtBase())
@@ -1501,6 +1543,10 @@ path path::lexically_relative(const path& base) const {
   if (ElemCount < 0)
     return {};
 
+  // if n == 0 and (a == end() || a->empty()), returns path("."); otherwise
+  if (ElemCount == 0 && (PP.atEnd() || *PP == ""))
+    return ".";
+
   // return a path constructed with 'n' dot-dot elements, followed by the the
   // elements of '*this' after the mismatch.
   path Result;
@@ -1514,21 +1560,68 @@ path path::lexically_relative(const path& base) const {
 
 ////////////////////////////////////////////////////////////////////////////
 // path.comparisons
-int path::__compare(string_view_t __s) const {
-  auto PP = PathParser::CreateBegin(__pn_);
-  auto PP2 = PathParser::CreateBegin(__s);
-  while (PP && PP2) {
-    int res = (*PP).compare(*PP2);
-    if (res != 0)
+static int CompareRootName(PathParser *LHS, PathParser *RHS) {
+  if (!LHS->inRootName() && !RHS->inRootName())
+    return 0;
+
+  auto GetRootName = [](PathParser *Parser) -> string_view_t {
+    return Parser->inRootName() ? **Parser : "";
+  };
+  int res = GetRootName(LHS).compare(GetRootName(RHS));
+  ConsumeRootName(LHS);
+  ConsumeRootName(RHS);
+  return res;
+}
+
+static int CompareRootDir(PathParser *LHS, PathParser *RHS) {
+  if (!LHS->inRootDir() && RHS->inRootDir())
+    return -1;
+  else if (LHS->inRootDir() && !RHS->inRootDir())
+    return 1;
+  else {
+    ConsumeRootDir(LHS);
+    ConsumeRootDir(RHS);
+    return 0;
+  }
+}
+
+static int CompareRelative(PathParser *LHSPtr, PathParser *RHSPtr) {
+  auto &LHS = *LHSPtr;
+  auto &RHS = *RHSPtr;
+  
+  int res;
+  while (LHS && RHS) {
+    if ((res = (*LHS).compare(*RHS)) != 0)
       return res;
-    ++PP;
-    ++PP2;
+    ++LHS;
+    ++RHS;
   }
-  if (PP.State == PP2.State && !PP)
-    return 0;
-  if (!PP)
+  return 0;
+}
+
+static int CompareEndState(PathParser *LHS, PathParser *RHS) {
+  if (LHS->atEnd() && !RHS->atEnd())
     return -1;
-  return 1;
+  else if (!LHS->atEnd() && RHS->atEnd())
+    return 1;
+  return 0;
+}
+
+int path::__compare(string_view_t __s) const {
+  auto LHS = PathParser::CreateBegin(__pn_);
+  auto RHS = PathParser::CreateBegin(__s);
+  int res;
+
+  if ((res = CompareRootName(&LHS, &RHS)) != 0)
+    return res;
+
+  if ((res = CompareRootDir(&LHS, &RHS)) != 0)
+    return res;
+
+  if ((res = CompareRelative(&LHS, &RHS)) != 0)
+    return res;
+
+  return CompareEndState(&LHS, &RHS);
 }
 
 ////////////////////////////////////////////////////////////////////////////
diff --git a/src/functional.cpp b/src/functional.cpp
index 5c2646f01..555d2c53f 100644
--- a/src/functional.cpp
+++ b/src/functional.cpp
@@ -1,9 +1,8 @@
 //===----------------------- functional.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/future.cpp b/src/future.cpp
index cbcd2e7b7..58d0b4c24 100644
--- a/src/future.cpp
+++ b/src/future.cpp
@@ -1,9 +1,8 @@
 //===------------------------- future.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/hash.cpp b/src/hash.cpp
index dc90f789c..89bb736c8 100644
--- a/src/hash.cpp
+++ b/src/hash.cpp
@@ -1,9 +1,8 @@
 //===-------------------------- hash.cpp ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -154,12 +153,8 @@ inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if<_Sz == 4, void>::type
 __check_for_overflow(size_t N)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (N > 0xFFFFFFFB)
-        throw overflow_error("__next_prime overflow");
-#else
-    (void)N;
-#endif
+        __throw_overflow_error("__next_prime overflow");
 }
 
 template <size_t _Sz = sizeof(size_t)>
@@ -167,12 +162,8 @@ inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if<_Sz == 8, void>::type
 __check_for_overflow(size_t N)
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (N > 0xFFFFFFFFFFFFFFC5ull)
-        throw overflow_error("__next_prime overflow");
-#else
-    (void)N;
-#endif
+        __throw_overflow_error("__next_prime overflow");
 }
 
 size_t
diff --git a/src/include/apple_availability.h b/src/include/apple_availability.h
index c12f7325c..009113817 100644
--- a/src/include/apple_availability.h
+++ b/src/include/apple_availability.h
@@ -1,9 +1,8 @@
 //===------------------------ apple_availability.h ------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef _LIBCPP_SRC_INCLUDE_APPLE_AVAILABILITY_H
diff --git a/src/include/atomic_support.h b/src/include/atomic_support.h
index ccd8d78d3..43c1a0023 100644
--- a/src/include/atomic_support.h
+++ b/src/include/atomic_support.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===////
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===////
 
diff --git a/src/include/config_elast.h b/src/include/config_elast.h
index c3cc19c22..18391afa0 100644
--- a/src/include/config_elast.h
+++ b/src/include/config_elast.h
@@ -1,9 +1,8 @@
 //===----------------------- config_elast.h -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/include/refstring.h b/src/include/refstring.h
index 702f2b738..e464b79ba 100644
--- a/src/include/refstring.h
+++ b/src/include/refstring.h
@@ -1,9 +1,8 @@
 //===------------------------ __refstring ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/ios.cpp b/src/ios.cpp
index 0f1d88e37..2dc84be82 100644
--- a/src/ios.cpp
+++ b/src/ios.cpp
@@ -1,9 +1,8 @@
 //===-------------------------- ios.cpp -----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -267,10 +266,9 @@ ios_base::clear(iostate state)
         __rdstate_ = state;
     else
         __rdstate_ = state | badbit;
-#ifndef _LIBCPP_NO_EXCEPTIONS
+
     if (((state | (__rdbuf_ ? goodbit : badbit)) & __exceptions_) != 0)
-        throw failure("ios_base::clear");
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        __throw_failure("ios_base::clear");
 }
 
 // init
@@ -310,35 +308,27 @@ ios_base::copyfmt(const ios_base& rhs)
     {
         size_t newesize = sizeof(event_callback) * rhs.__event_size_;
         new_callbacks.reset(static_cast<event_callback*>(malloc(newesize)));
-#ifndef _LIBCPP_NO_EXCEPTIONS
         if (!new_callbacks)
-            throw bad_alloc();
-#endif  // _LIBCPP_NO_EXCEPTIONS
+            __throw_bad_alloc();
 
         size_t newisize = sizeof(int) * rhs.__event_size_;
         new_ints.reset(static_cast<int *>(malloc(newisize)));
-#ifndef _LIBCPP_NO_EXCEPTIONS
         if (!new_ints)
-            throw bad_alloc();
-#endif  // _LIBCPP_NO_EXCEPTIONS
+            __throw_bad_alloc();
     }
     if (__iarray_cap_ < rhs.__iarray_size_)
     {
         size_t newsize = sizeof(long) * rhs.__iarray_size_;
         new_longs.reset(static_cast<long*>(malloc(newsize)));
-#ifndef _LIBCPP_NO_EXCEPTIONS
         if (!new_longs)
-            throw bad_alloc();
-#endif  // _LIBCPP_NO_EXCEPTIONS
+            __throw_bad_alloc();
     }
     if (__parray_cap_ < rhs.__parray_size_)
     {
         size_t newsize = sizeof(void*) * rhs.__parray_size_;
         new_pointers.reset(static_cast<void**>(malloc(newsize)));
-#ifndef _LIBCPP_NO_EXCEPTIONS
         if (!new_pointers)
-            throw bad_alloc();
-#endif  // _LIBCPP_NO_EXCEPTIONS
+            __throw_bad_alloc();
     }
     // Got everything we need.  Copy everything but __rdstate_, __rdbuf_ and __exceptions_
     __fmtflags_ = rhs.__fmtflags_;
diff --git a/src/iostream.cpp b/src/iostream.cpp
index 11bfb4862..9b8d1fa44 100644
--- a/src/iostream.cpp
+++ b/src/iostream.cpp
@@ -1,9 +1,8 @@
 //===------------------------ iostream.cpp --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/locale.cpp b/src/locale.cpp
index b9c701137..00eb574ec 100644
--- a/src/locale.cpp
+++ b/src/locale.cpp
@@ -1,9 +1,8 @@
 //===------------------------- locale.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -469,10 +468,8 @@ locale::__imp::install(facet* f, long id)
 const locale::facet*
 locale::__imp::use_facet(long id) const
 {
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (!has_facet(id))
-        throw bad_cast();
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        __throw_bad_cast();
     return facets_[static_cast<size_t>(id)];
 }
 
@@ -538,12 +535,8 @@ locale::operator=(const locale& other)  _NOEXCEPT
 }
 
 locale::locale(const char* name)
-#ifndef _LIBCPP_NO_EXCEPTIONS
     : __locale_(name ? new __imp(name)
-                     : throw runtime_error("locale constructed with null"))
-#else  // _LIBCPP_NO_EXCEPTIONS
-    : __locale_(new __imp(name))
-#endif
+                     : (__throw_runtime_error("locale constructed with null"), (__imp*)0))
 {
     __locale_->__add_shared();
 }
@@ -555,12 +548,8 @@ locale::locale(const string& name)
 }
 
 locale::locale(const locale& other, const char* name, category c)
-#ifndef _LIBCPP_NO_EXCEPTIONS
     : __locale_(name ? new __imp(*other.__locale_, name, c)
-                     : throw runtime_error("locale constructed with null"))
-#else  // _LIBCPP_NO_EXCEPTIONS
-    : __locale_(new __imp(*other.__locale_, name, c))
-#endif
+                     : (__throw_runtime_error("locale constructed with null"), (__imp*)0))
 {
     __locale_->__add_shared();
 }
diff --git a/src/memory.cpp b/src/memory.cpp
index 77ebe837c..8b05c3f16 100644
--- a/src/memory.cpp
+++ b/src/memory.cpp
@@ -1,9 +1,8 @@
 //===------------------------ memory.cpp ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/mutex.cpp b/src/mutex.cpp
index c61d34bb8..a9ccc9aa9 100644
--- a/src/mutex.cpp
+++ b/src/mutex.cpp
@@ -1,9 +1,8 @@
 //===------------------------- mutex.cpp ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/new.cpp b/src/new.cpp
index cc8383d4f..4acb69391 100644
--- a/src/new.cpp
+++ b/src/new.cpp
@@ -1,9 +1,8 @@
 //===--------------------------- new.cpp ----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ namespace std
 {
 
 #ifndef __GLIBCXX__
-const nothrow_t nothrow = {};
+const nothrow_t nothrow{};
 #endif
 
 #ifndef LIBSTDCXX
diff --git a/src/optional.cpp b/src/optional.cpp
index 6099b6b41..3aaf5ea55 100644
--- a/src/optional.cpp
+++ b/src/optional.cpp
@@ -1,9 +1,8 @@
 //===------------------------ optional.cpp --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/random.cpp b/src/random.cpp
index 4a2468368..04adc59f9 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -1,9 +1,8 @@
 //===-------------------------- random.cpp --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/regex.cpp b/src/regex.cpp
index a7363599d..a971f6464 100644
--- a/src/regex.cpp
+++ b/src/regex.cpp
@@ -1,9 +1,8 @@
 //===-------------------------- regex.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/shared_mutex.cpp b/src/shared_mutex.cpp
index 6185f15de..e918e1bdf 100644
--- a/src/shared_mutex.cpp
+++ b/src/shared_mutex.cpp
@@ -1,9 +1,8 @@
 //===---------------------- shared_mutex.cpp ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/stdexcept.cpp b/src/stdexcept.cpp
index 5e06e521e..179c25017 100644
--- a/src/stdexcept.cpp
+++ b/src/stdexcept.cpp
@@ -1,9 +1,8 @@
 //===------------------------ stdexcept.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,20 +43,6 @@ logic_error::operator=(const logic_error& le) _NOEXCEPT
     return *this;
 }
 
-#if !defined(_LIBCPPABI_VERSION) && !defined(LIBSTDCXX)
-
-logic_error::~logic_error() _NOEXCEPT
-{
-}
-
-const char*
-logic_error::what() const _NOEXCEPT
-{
-    return __imp_.c_str();
-}
-
-#endif
-
 runtime_error::runtime_error(const string& msg) : __imp_(msg.c_str())
 {
 }
@@ -80,8 +65,10 @@ runtime_error::operator=(const runtime_error& le) _NOEXCEPT
 
 #if !defined(_LIBCPPABI_VERSION) && !defined(LIBSTDCXX)
 
-runtime_error::~runtime_error() _NOEXCEPT
+const char*
+logic_error::what() const _NOEXCEPT
 {
+    return __imp_.c_str();
 }
 
 const char*
@@ -90,15 +77,20 @@ runtime_error::what() const _NOEXCEPT
     return __imp_.c_str();
 }
 
+#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
+
+logic_error::~logic_error() _NOEXCEPT {}
 domain_error::~domain_error() _NOEXCEPT {}
 invalid_argument::~invalid_argument() _NOEXCEPT {}
 length_error::~length_error() _NOEXCEPT {}
 out_of_range::~out_of_range() _NOEXCEPT {}
 
+runtime_error::~runtime_error() _NOEXCEPT {}
 range_error::~range_error() _NOEXCEPT {}
 overflow_error::~overflow_error() _NOEXCEPT {}
 underflow_error::~underflow_error() _NOEXCEPT {}
 
 #endif
+#endif
 
 }  // std
diff --git a/src/string.cpp b/src/string.cpp
index d7ebdd3e5..6c89a5d7e 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -1,9 +1,8 @@
 //===------------------------- string.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/strstream.cpp b/src/strstream.cpp
index 8b8521f76..ae6680683 100644
--- a/src/strstream.cpp
+++ b/src/strstream.cpp
@@ -1,9 +1,8 @@
 //===------------------------ strstream.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_fallback.ipp b/src/support/runtime/exception_fallback.ipp
index 16d387b99..376a0381f 100644
--- a/src/support/runtime/exception_fallback.ipp
+++ b/src/support/runtime/exception_fallback.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_glibcxx.ipp b/src/support/runtime/exception_glibcxx.ipp
index dda4432b5..4bf3c4d87 100644
--- a/src/support/runtime/exception_glibcxx.ipp
+++ b/src/support/runtime/exception_glibcxx.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_libcxxabi.ipp b/src/support/runtime/exception_libcxxabi.ipp
index feefc5152..6bc049bf3 100644
--- a/src/support/runtime/exception_libcxxabi.ipp
+++ b/src/support/runtime/exception_libcxxabi.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_libcxxrt.ipp b/src/support/runtime/exception_libcxxrt.ipp
index 52fe8635d..0ebffdedb 100644
--- a/src/support/runtime/exception_libcxxrt.ipp
+++ b/src/support/runtime/exception_libcxxrt.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_msvc.ipp b/src/support/runtime/exception_msvc.ipp
index 042d3add6..21119b0e9 100644
--- a/src/support/runtime/exception_msvc.ipp
+++ b/src/support/runtime/exception_msvc.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_pointer_cxxabi.ipp b/src/support/runtime/exception_pointer_cxxabi.ipp
index dfac8648c..82a8e6972 100644
--- a/src/support/runtime/exception_pointer_cxxabi.ipp
+++ b/src/support/runtime/exception_pointer_cxxabi.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_pointer_glibcxx.ipp b/src/support/runtime/exception_pointer_glibcxx.ipp
index 9d20dfe48..3abc137c6 100644
--- a/src/support/runtime/exception_pointer_glibcxx.ipp
+++ b/src/support/runtime/exception_pointer_glibcxx.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_pointer_msvc.ipp b/src/support/runtime/exception_pointer_msvc.ipp
index 9b0d2361e..b1a369522 100644
--- a/src/support/runtime/exception_pointer_msvc.ipp
+++ b/src/support/runtime/exception_pointer_msvc.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/exception_pointer_unimplemented.ipp b/src/support/runtime/exception_pointer_unimplemented.ipp
index 21c182c85..991bca9ec 100644
--- a/src/support/runtime/exception_pointer_unimplemented.ipp
+++ b/src/support/runtime/exception_pointer_unimplemented.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/runtime/new_handler_fallback.ipp b/src/support/runtime/new_handler_fallback.ipp
index ec3f52354..720509394 100644
--- a/src/support/runtime/new_handler_fallback.ipp
+++ b/src/support/runtime/new_handler_fallback.ipp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/solaris/xlocale.cpp b/src/support/solaris/xlocale.cpp
index 6eaf317c7..b6a2bfe21 100644
--- a/src/support/solaris/xlocale.cpp
+++ b/src/support/solaris/xlocale.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/win32/locale_win32.cpp b/src/support/win32/locale_win32.cpp
index cad9d4e81..c11adfe4c 100644
--- a/src/support/win32/locale_win32.cpp
+++ b/src/support/win32/locale_win32.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------- support/win32/locale_win32.cpp ------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/support/win32/support.cpp b/src/support/win32/support.cpp
index aa636fba5..4c9a4b3a5 100644
--- a/src/support/win32/support.cpp
+++ b/src/support/win32/support.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------- support/win32/support.h ----------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,6 +61,11 @@ size_t mbsnrtowcs( wchar_t *__restrict dst, const char **__restrict src,
     size_t result = 0;
     bool have_result = false;
 
+    // If dst is null then max_dest_chars should be ignored according to the
+    // standard.  Setting max_dest_chars to a large value has this effect.
+    if (!dst)
+        max_dest_chars = static_cast<size_t>(-1);
+
     while ( source_remaining ) {
         if ( dst && dest_converted >= max_dest_chars )
             break;
@@ -115,6 +119,11 @@ size_t wcsnrtombs( char *__restrict dst, const wchar_t **__restrict src,
     bool have_result = false;
     bool terminator_found = false;
 
+    // If dst is null then dst_size_bytes should be ignored according to the
+    // standard.  Setting dest_remaining to a large value has this effect.
+    if (!dst)
+        dest_remaining = static_cast<size_t>(-1);
+
     while ( source_converted != max_source_chars ) {
         if ( ! dest_remaining )
             break;
diff --git a/src/support/win32/thread_win32.cpp b/src/support/win32/thread_win32.cpp
index 1567042d8..3ca36df80 100644
--- a/src/support/win32/thread_win32.cpp
+++ b/src/support/win32/thread_win32.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------- support/win32/thread_win32.cpp ------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/system_error.cpp b/src/system_error.cpp
index 06caa6fec..9ddf7bcbe 100644
--- a/src/system_error.cpp
+++ b/src/system_error.cpp
@@ -1,9 +1,8 @@
 //===---------------------- system_error.cpp ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/thread.cpp b/src/thread.cpp
index 241cfee23..bc5dfb243 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -1,9 +1,8 @@
 //===------------------------- thread.cpp----------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/typeinfo.cpp b/src/typeinfo.cpp
index 42ff9351e..b49c98273 100644
--- a/src/typeinfo.cpp
+++ b/src/typeinfo.cpp
@@ -1,9 +1,8 @@
 //===------------------------- typeinfo.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/utility.cpp b/src/utility.cpp
index 7dccffb73..016a5d91b 100644
--- a/src/utility.cpp
+++ b/src/utility.cpp
@@ -1,9 +1,8 @@
 //===------------------------ utility.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/valarray.cpp b/src/valarray.cpp
index 2d8db52ac..893de050f 100644
--- a/src/valarray.cpp
+++ b/src/valarray.cpp
@@ -1,9 +1,8 @@
 //===------------------------ valarray.cpp --------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/variant.cpp b/src/variant.cpp
index 5bb508c3f..1fe70a180 100644
--- a/src/variant.cpp
+++ b/src/variant.cpp
@@ -1,9 +1,8 @@
 //===------------------------ variant.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/src/vector.cpp b/src/vector.cpp
index 300adaed5..3b65e558f 100644
--- a/src/vector.cpp
+++ b/src/vector.cpp
@@ -1,9 +1,8 @@
 //===------------------------- vector.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.cxx1z.pass.cpp b/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.cxx1z.pass.cpp
index 58ce68998..0b55ae950 100644
--- a/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.cxx1z.pass.cpp
+++ b/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.cxx1z.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,10 +39,12 @@ struct gen
 };
 
 
-int main()
+int main(int, char**)
 {
     std::vector<int> v;
     std::random_shuffle(v.begin(), v.end());
     gen r;
     std::random_shuffle(v.begin(), v.end(), r);
+
+  return 0;
 }
diff --git a/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.fail.cpp b/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.fail.cpp
index 608f4f86c..7c187edae 100644
--- a/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.fail.cpp
+++ b/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,10 +40,12 @@ struct gen
 };
 
 
-int main()
+int main(int, char**)
 {
     int v[1] = {1};
     std::random_shuffle(&v[0], &v[1]); // expected-error{{'random_shuffle<int *>' is deprecated}}
     gen r;
     std::random_shuffle(&v[0], &v[1], r); // expected-error{{'random_shuffle<int *, gen &>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/libcxx/algorithms/debug_less.pass.cpp b/test/libcxx/algorithms/debug_less.pass.cpp
index 302c5a837..247e07f06 100644
--- a/test/libcxx/algorithms/debug_less.pass.cpp
+++ b/test/libcxx/algorithms/debug_less.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -211,8 +210,10 @@ void test_upper_and_lower_bound() {
     }
 }
 
-int main() {
+int main(int, char**) {
     test_passing();
     test_failing();
     test_upper_and_lower_bound();
+
+  return 0;
 }
diff --git a/test/libcxx/algorithms/half_positive.pass.cpp b/test/libcxx/algorithms/half_positive.pass.cpp
index 7dcfc2c92..ec2d57c9d 100644
--- a/test/libcxx/algorithms/half_positive.pass.cpp
+++ b/test/libcxx/algorithms/half_positive.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ TEST_CONSTEXPR bool test(IntType max_v = IntType(std::numeric_limits<UnderlyingT
 
 }  // namespace
 
-int main()
+int main(int, char**)
 {
     {
         assert(test<char>());
@@ -53,4 +52,6 @@ int main()
 #endif  // !defined(_LIBCPP_HAS_NO_INT128)
     }
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/libcxx/algorithms/version.pass.cpp b/test/libcxx/algorithms/version.pass.cpp
index 20f0637e6..e7d368789 100644
--- a/test/libcxx/algorithms/version.pass.cpp
+++ b/test/libcxx/algorithms/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/atomics/atomics.align/align.pass.sh.cpp b/test/libcxx/atomics/atomics.align/align.pass.sh.cpp
index e0ae37e9c..16badab84 100644
--- a/test/libcxx/atomics/atomics.align/align.pass.sh.cpp
+++ b/test/libcxx/atomics/atomics.align/align.pass.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -36,7 +35,7 @@ template <typename T> struct atomic_test : public std::__atomic_base<T> {
   }
 };
 
-int main() {
+int main(int, char**) {
 
 // structs and unions can't be defined in the template invocation.
 // Work around this with a typedef.
@@ -90,4 +89,6 @@ int main() {
   CHECK_ALIGNMENT(struct LLIArr16 { long long int i[16]; });
   CHECK_ALIGNMENT(struct Padding { char c; /* padding */ long long int i; });
   CHECK_ALIGNMENT(union IntFloat { int i; float f; });
+
+  return 0;
 }
diff --git a/test/libcxx/atomics/atomics.flag/init_bool.pass.cpp b/test/libcxx/atomics/atomics.flag/init_bool.pass.cpp
index 9dd68bd4e..2919fb666 100644
--- a/test/libcxx/atomics/atomics.flag/init_bool.pass.cpp
+++ b/test/libcxx/atomics/atomics.flag/init_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,7 @@ X x;
 std::atomic_flag global = ATOMIC_FLAG_INIT;
 #endif
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     assert(global.test_and_set() == 1);
@@ -41,4 +40,6 @@ int main()
         std::atomic_flag f(true);
         assert(f.test_and_set() == 1);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/atomics/diagnose_invalid_memory_order.fail.cpp b/test/libcxx/atomics/diagnose_invalid_memory_order.fail.cpp
index 51a1f2307..7bc21851b 100644
--- a/test/libcxx/atomics/diagnose_invalid_memory_order.fail.cpp
+++ b/test/libcxx/atomics/diagnose_invalid_memory_order.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include <atomic>
 
-int main() {
+int main(int, char**) {
     std::atomic<int> x(42);
     volatile std::atomic<int>& vx = x;
     int val1 = 1; ((void)val1);
@@ -125,4 +124,6 @@ int main() {
         std::atomic_compare_exchange_strong_explicit(&x, &val1, val2, std::memory_order_seq_cst, std::memory_order_acquire);
         std::atomic_compare_exchange_strong_explicit(&x, &val1, val2, std::memory_order_seq_cst, std::memory_order_seq_cst);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/atomics/libcpp-has-no-threads.fail.cpp b/test/libcxx/atomics/libcpp-has-no-threads.fail.cpp
index 38f89db17..6ee09e206 100644
--- a/test/libcxx/atomics/libcpp-has-no-threads.fail.cpp
+++ b/test/libcxx/atomics/libcpp-has-no-threads.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,6 +18,8 @@
 
 #include <atomic>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/atomics/libcpp-has-no-threads.pass.cpp b/test/libcxx/atomics/libcpp-has-no-threads.pass.cpp
index e587e6b43..af2d55e1a 100644
--- a/test/libcxx/atomics/libcpp-has-no-threads.pass.cpp
+++ b/test/libcxx/atomics/libcpp-has-no-threads.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // XFAIL: libcpp-has-no-threads
@@ -13,6 +12,8 @@
    'libcpp-has-no-threads' is available iff _LIBCPP_HAS_NO_THREADS is defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/atomics/version.pass.cpp b/test/libcxx/atomics/version.pass.cpp
index fae2736d2..48114a3e5 100644
--- a/test/libcxx/atomics/version.pass.cpp
+++ b/test/libcxx/atomics/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,6 +16,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/map/at.abort.pass.cpp b/test/libcxx/containers/associative/map/at.abort.pass.cpp
new file mode 100644
index 000000000..d34f48f4d
--- /dev/null
+++ b/test/libcxx/containers/associative/map/at.abort.pass.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// class map
+
+// mapped_type& at(const key_type& k);
+
+// Make sure we abort() when exceptions are disabled and we fetch a key that
+// is not in the map.
+
+// REQUIRES: libcpp-no-exceptions
+
+#include <csignal>
+#include <cstdlib>
+#include <map>
+
+
+void exit_success(int) {
+    std::_Exit(EXIT_SUCCESS);
+}
+
+int main(int, char**) {
+    std::signal(SIGABRT, exit_success);
+    std::map<int, int> map;
+    map.at(1);
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/containers/associative/map/at.const.abort.pass.cpp b/test/libcxx/containers/associative/map/at.const.abort.pass.cpp
new file mode 100644
index 000000000..705ada869
--- /dev/null
+++ b/test/libcxx/containers/associative/map/at.const.abort.pass.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <map>
+
+// class map
+
+// const mapped_type& at(const key_type& k) const;
+
+// Make sure we abort() when exceptions are disabled and we fetch a key that
+// is not in the map.
+
+// REQUIRES: libcpp-no-exceptions
+
+#include <csignal>
+#include <cstdlib>
+#include <map>
+
+
+void exit_success(int) {
+    std::_Exit(EXIT_SUCCESS);
+}
+
+int main(int, char**) {
+    std::signal(SIGABRT, exit_success);
+    std::map<int, int> const map;
+    map.at(1);
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/containers/associative/map/version.pass.cpp b/test/libcxx/containers/associative/map/version.pass.cpp
index b2e3fa43e..8a498c60d 100644
--- a/test/libcxx/containers/associative/map/version.pass.cpp
+++ b/test/libcxx/containers/associative/map/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/non_const_comparator.fail.cpp b/test/libcxx/containers/associative/non_const_comparator.fail.cpp
index ddd796089..432e7c08d 100644
--- a/test/libcxx/containers/associative/non_const_comparator.fail.cpp
+++ b/test/libcxx/containers/associative/non_const_comparator.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct BadCompare {
   }
 };
 
-int main() {
+int main(int, char**) {
   static_assert(!std::__invokable<BadCompare const&, int const&, int const&>::value, "");
   static_assert(std::__invokable<BadCompare&, int const&, int const&>::value, "");
 
@@ -45,4 +44,6 @@ int main() {
     using C = std::multimap<long, int, BadCompare>;
     C s;
   }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/set/version.pass.cpp b/test/libcxx/containers/associative/set/version.pass.cpp
index c3c4d926e..b0d9abd6a 100644
--- a/test/libcxx/containers/associative/set/version.pass.cpp
+++ b/test/libcxx/containers/associative/set/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/tree_balance_after_insert.pass.cpp b/test/libcxx/containers/associative/tree_balance_after_insert.pass.cpp
index 300c1e9a4..e178a408f 100644
--- a/test/libcxx/containers/associative/tree_balance_after_insert.pass.cpp
+++ b/test/libcxx/containers/associative/tree_balance_after_insert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1609,11 +1608,13 @@ test5()
     assert(h.__is_black_ == true);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
     test4();
     test5();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/tree_key_value_traits.pass.cpp b/test/libcxx/containers/associative/tree_key_value_traits.pass.cpp
index 0befd749a..12289c84a 100644
--- a/test/libcxx/containers/associative/tree_key_value_traits.pass.cpp
+++ b/test/libcxx/containers/associative/tree_key_value_traits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,6 +53,8 @@ void testKeyValueTrait() {
   }
 }
 
-int main() {
+int main(int, char**) {
   testKeyValueTrait();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/tree_left_rotate.pass.cpp b/test/libcxx/containers/associative/tree_left_rotate.pass.cpp
index 2720b448b..5f775c3f6 100644
--- a/test/libcxx/containers/associative/tree_left_rotate.pass.cpp
+++ b/test/libcxx/containers/associative/tree_left_rotate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -94,8 +93,10 @@ test2()
     assert(c.__right_ == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/tree_remove.pass.cpp b/test/libcxx/containers/associative/tree_remove.pass.cpp
index fa0b7d4a1..c3ec20c55 100644
--- a/test/libcxx/containers/associative/tree_remove.pass.cpp
+++ b/test/libcxx/containers/associative/tree_remove.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1642,10 +1641,12 @@ test4()
     assert(root.__is_black_ == false);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
     test4();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/tree_right_rotate.pass.cpp b/test/libcxx/containers/associative/tree_right_rotate.pass.cpp
index 9355a46b4..5332d7b16 100644
--- a/test/libcxx/containers/associative/tree_right_rotate.pass.cpp
+++ b/test/libcxx/containers/associative/tree_right_rotate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -94,8 +93,10 @@ test2()
     assert(c.__right_ == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/associative/undef_min_max.pass.cpp b/test/libcxx/containers/associative/undef_min_max.pass.cpp
index be5e11052..53dd87871 100644
--- a/test/libcxx/containers/associative/undef_min_max.pass.cpp
+++ b/test/libcxx/containers/associative/undef_min_max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 
 #include <map>
 
-int main() {
+int main(int, char**) {
   std::map<int, int> m;
   ((void)m);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/container.adaptors/queue/version.pass.cpp b/test/libcxx/containers/container.adaptors/queue/version.pass.cpp
index 35b94b33c..353c09179 100644
--- a/test/libcxx/containers/container.adaptors/queue/version.pass.cpp
+++ b/test/libcxx/containers/container.adaptors/queue/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/container.adaptors/stack/version.pass.cpp b/test/libcxx/containers/container.adaptors/stack/version.pass.cpp
index 339d0f4dd..e8da8c52b 100644
--- a/test/libcxx/containers/container.adaptors/stack/version.pass.cpp
+++ b/test/libcxx/containers/container.adaptors/stack/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/gnu_cxx/hash_map.pass.cpp b/test/libcxx/containers/gnu_cxx/hash_map.pass.cpp
index 0d9115d0f..12529e0f1 100644
--- a/test/libcxx/containers/gnu_cxx/hash_map.pass.cpp
+++ b/test/libcxx/containers/gnu_cxx/hash_map.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@ namespace __gnu_cxx {
 template class hash_map<int, int>;
 }
 
-int main() {
+int main(int, char**) {
   typedef __gnu_cxx::hash_map<int, int> Map;
   Map m;
   Map m2(m);
   ((void)m2);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/gnu_cxx/hash_set.pass.cpp b/test/libcxx/containers/gnu_cxx/hash_set.pass.cpp
index 5fd4bde66..e4fa98863 100644
--- a/test/libcxx/containers/gnu_cxx/hash_set.pass.cpp
+++ b/test/libcxx/containers/gnu_cxx/hash_set.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@ namespace __gnu_cxx {
 template class hash_set<int>;
 }
 
-int main() {
+int main(int, char**) {
   typedef __gnu_cxx::hash_set<int> Set;
   Set s;
   Set s2(s);
   ((void)s2);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/array/array.zero/db_back.pass.cpp b/test/libcxx/containers/sequences/array/array.zero/db_back.pass.cpp
index 465523f84..3c3191166 100644
--- a/test/libcxx/containers/sequences/array/array.zero/db_back.pass.cpp
+++ b/test/libcxx/containers/sequences/array/array.zero/db_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ inline bool CheckDebugThrows(Array& Arr) {
   return false;
 }
 
-int main()
+int main(int, char**)
 {
   {
     typedef std::array<int, 0> C;
@@ -46,4 +45,6 @@ int main()
     assert(CheckDebugThrows(c));
     assert(CheckDebugThrows(cc));
   }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/array/array.zero/db_front.pass.cpp b/test/libcxx/containers/sequences/array/array.zero/db_front.pass.cpp
index d49b3a763..9f6f09f98 100644
--- a/test/libcxx/containers/sequences/array/array.zero/db_front.pass.cpp
+++ b/test/libcxx/containers/sequences/array/array.zero/db_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ inline bool CheckDebugThrows(Array& Arr) {
   return false;
 }
 
-int main()
+int main(int, char**)
 {
   {
     typedef std::array<int, 0> C;
@@ -46,4 +45,6 @@ int main()
     assert(CheckDebugThrows(c));
     assert(CheckDebugThrows(cc));
   }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/array/array.zero/db_indexing.pass.cpp b/test/libcxx/containers/sequences/array/array.zero/db_indexing.pass.cpp
index 4d6ad6907..cb5e99b29 100644
--- a/test/libcxx/containers/sequences/array/array.zero/db_indexing.pass.cpp
+++ b/test/libcxx/containers/sequences/array/array.zero/db_indexing.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ inline bool CheckDebugThrows(Array& Arr, size_t Index) {
   return false;
 }
 
-int main()
+int main(int, char**)
 {
   {
     typedef std::array<int, 0> C;
@@ -50,4 +49,6 @@ int main()
     assert(CheckDebugThrows(cc, 0));
     assert(CheckDebugThrows(cc, 1));
   }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/array/version.pass.cpp b/test/libcxx/containers/sequences/array/version.pass.cpp
index b89a8dd8c..29b15ad3e 100644
--- a/test/libcxx/containers/sequences/array/version.pass.cpp
+++ b/test/libcxx/containers/sequences/array/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/deque/incomplete.pass.cpp b/test/libcxx/containers/sequences/deque/incomplete.pass.cpp
index c23195ed2..8179768d5 100644
--- a/test/libcxx/containers/sequences/deque/incomplete.pass.cpp
+++ b/test/libcxx/containers/sequences/deque/incomplete.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,10 +22,12 @@ struct A {
   std::deque<A>::reverse_iterator it2;
 };
 
-int main()
+int main(int, char**)
 {
   A a;
   assert(a.d.size() == 0);
   a.it = a.d.begin();
   a.it2 = a.d.rend();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/deque/pop_back_empty.pass.cpp b/test/libcxx/containers/sequences/deque/pop_back_empty.pass.cpp
index e4f5d0b01..169c0f72d 100644
--- a/test/libcxx/containers/sequences/deque/pop_back_empty.pass.cpp
+++ b/test/libcxx/containers/sequences/deque/pop_back_empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <deque>
 
 
-int main() {
+int main(int, char**) {
     std::deque<int> q;
     q.push_back(0);
     q.pop_back();
     q.pop_back();
     std::exit(1);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/deque/version.pass.cpp b/test/libcxx/containers/sequences/deque/version.pass.cpp
index 22e663d9b..8f05025f1 100644
--- a/test/libcxx/containers/sequences/deque/version.pass.cpp
+++ b/test/libcxx/containers/sequences/deque/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/forwardlist/version.pass.cpp b/test/libcxx/containers/sequences/forwardlist/version.pass.cpp
index 918c8dd5d..cbe6d5821 100644
--- a/test/libcxx/containers/sequences/forwardlist/version.pass.cpp
+++ b/test/libcxx/containers/sequences/forwardlist/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.cons/db_copy.pass.cpp b/test/libcxx/containers/sequences/list/list.cons/db_copy.pass.cpp
index a0b35f335..da0eb5ce0 100644
--- a/test/libcxx/containers/sequences/list/list.cons/db_copy.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.cons/db_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::list<int> l1;
     l1.push_back(1); l1.push_back(2); l1.push_back(3);
@@ -28,4 +27,6 @@ int main()
     std::list<int> l2 = l1;
     l2.erase(i);
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.cons/db_move.pass.cpp b/test/libcxx/containers/sequences/list/list.cons/db_move.pass.cpp
index 570e5a0b3..dcd05ec41 100644
--- a/test/libcxx/containers/sequences/list/list.cons/db_move.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.cons/db_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,10 +25,12 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::list<int> l1 = {1, 2, 3};
     std::list<int>::iterator i = l1.begin();
     std::list<int> l2 = std::move(l1);
     assert(*l2.erase(i) == 2);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/emplace_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/emplace_db1.pass.cpp
index 67146bc7c..b570fef66 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/emplace_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/emplace_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,10 +37,12 @@ public:
     double getd() const {return d_;}
 };
 
-int main()
+int main(int, char**)
 {
     std::list<A> c1;
     std::list<A> c2;
     std::list<A>::iterator i = c1.emplace(c2.cbegin(), 2, 3.5);
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db1.pass.cpp
index 24cadbe01..c573bf7be 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,11 +20,13 @@
 #include <cassert>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     std::list<int> l1(a1, a1+3);
     std::list<int>::const_iterator i = l1.end();
     l1.erase(i);
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db2.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db2.pass.cpp
index 6d3e7617b..65cc4b8f8 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db2.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     std::list<int> l1(a1, a1+3);
@@ -29,4 +28,6 @@ int main()
     std::list<int>::const_iterator i = l2.begin();
     l1.erase(i);
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db1.pass.cpp
index dd592f90c..971f2bd3f 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,12 +20,14 @@
 #include <cassert>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     std::list<int> l1(a1, a1+3);
     std::list<int> l2(a1, a1+3);
     std::list<int>::iterator i = l1.erase(l2.cbegin(), next(l1.cbegin()));
     assert(false);
+
+  return 0;
 }
 
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db2.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db2.pass.cpp
index d5e8fd9d8..131529e5c 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db2.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,11 +20,13 @@
 #include <cassert>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     std::list<int> l1(a1, a1+3);
     std::list<int> l2(a1, a1+3);
     std::list<int>::iterator i = l1.erase(l1.cbegin(), next(l2.cbegin()));
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db3.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db3.pass.cpp
index 3ae20cdc5..a9a35056a 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db3.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,11 +20,13 @@
 #include <cassert>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     std::list<int> l1(a1, a1+3);
     std::list<int> l2(a1, a1+3);
     std::list<int>::iterator i = l1.erase(l2.cbegin(), next(l2.cbegin()));
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db4.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db4.pass.cpp
index 6d6e29e47..642ee4498 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db4.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/erase_iter_iter_db4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 #include <cassert>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     std::list<int> l1(a1, a1+3);
     std::list<int>::iterator i = l1.erase(next(l1.cbegin()), l1.cbegin());
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_iter_iter_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_iter_iter_db1.pass.cpp
index 03b9667cf..c7c7f76b9 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_iter_iter_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_iter_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <cassert>
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> v(100);
@@ -36,4 +35,6 @@ int main()
                                        input_iterator<const int*>(a+N));
         assert(false);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_rvalue_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_rvalue_db1.pass.cpp
index 6e25b0c3c..10503bd9c 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_rvalue_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_rvalue_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::list<int> v1(3);
     std::list<int> v2(3);
     v1.insert(v2.begin(), 4);
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_size_value_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_size_value_db1.pass.cpp
index 6999c4053..7a658e394 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_size_value_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_size_value_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::list<int> c1(100);
     std::list<int> c2;
     std::list<int>::iterator i = c1.insert(next(c2.cbegin(), 10), 5, 1);
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_value_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_value_db1.pass.cpp
index 66983f01e..cdf01fe90 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_value_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/insert_iter_value_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,11 +21,13 @@
 #include <cassert>
 
 
-int main()
+int main(int, char**)
 {
     std::list<int> v1(3);
     std::list<int> v2(3);
     int i = 4;
     v1.insert(v2.begin(), i);
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.modifiers/pop_back_db1.pass.cpp b/test/libcxx/containers/sequences/list/list.modifiers/pop_back_db1.pass.cpp
index 9151fc1dd..8649f12a8 100644
--- a/test/libcxx/containers/sequences/list/list.modifiers/pop_back_db1.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.modifiers/pop_back_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = {1, 2, 3};
     std::list<int> c(a, a+3);
@@ -33,4 +32,6 @@ int main()
     assert(c.empty());
     c.pop_back(); // operation under test
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list.pass.cpp b/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list.pass.cpp
index 541dd056b..23323d8c6 100644
--- a/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> v1(3);
@@ -29,4 +28,6 @@ int main()
         v1.splice(v2.begin(), v2);
         assert(false);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter.pass.cpp b/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter.pass.cpp
index 64ef78ed0..37a206d2c 100644
--- a/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> v1(3);
@@ -29,4 +28,6 @@ int main()
         v1.splice(v1.begin(), v2, v1.begin());
         assert(false);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter_iter.pass.cpp b/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter_iter.pass.cpp
index 9fed4b577..768c3d6f1 100644
--- a/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter_iter.pass.cpp
+++ b/test/libcxx/containers/sequences/list/list.ops/db_splice_pos_list_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> v1(3);
@@ -29,4 +28,6 @@ int main()
         v1.splice(v1.begin(), v2, v2.begin(), v1.end());
         assert(false);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/list/version.pass.cpp b/test/libcxx/containers/sequences/list/version.pass.cpp
index 097c013f5..677c085b4 100644
--- a/test/libcxx/containers/sequences/list/version.pass.cpp
+++ b/test/libcxx/containers/sequences/list/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/vector/asan.pass.cpp b/test/libcxx/containers/sequences/vector/asan.pass.cpp
index db337e6b2..866cce152 100644
--- a/test/libcxx/containers/sequences/vector/asan.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/asan.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ void do_exit() {
   exit(0);
 }
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     {
@@ -69,5 +68,5 @@ int main()
     }
 }
 #else
-int main () { return 0; }
+int main(int, char**) { return 0; }
 #endif
diff --git a/test/libcxx/containers/sequences/vector/asan_throw.pass.cpp b/test/libcxx/containers/sequences/vector/asan_throw.pass.cpp
index 30cf3f42e..443a6f2e9 100644
--- a/test/libcxx/containers/sequences/vector/asan_throw.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/asan_throw.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -220,7 +219,7 @@ void test_resize_param() {
   assert(is_contiguous_container_asan_correct(v));
 }
 
-int main() {
+int main(int, char**) {
   test_push_back();
   test_emplace_back();
   test_insert_range();
@@ -231,4 +230,6 @@ int main() {
   test_insert_n2();
   test_resize();
   test_resize_param();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/vector/const_value_type.pass.cpp b/test/libcxx/containers/sequences/vector/const_value_type.pass.cpp
index 2a150f7cc..d3407e3aa 100644
--- a/test/libcxx/containers/sequences/vector/const_value_type.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/const_value_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <vector>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::vector<const int> v = {1, 2, 3};
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/vector/db_back.pass.cpp b/test/libcxx/containers/sequences/vector/db_back.pass.cpp
index d66ffeb67..3a35a086b 100644
--- a/test/libcxx/containers/sequences/vector/db_back.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_cback.pass.cpp b/test/libcxx/containers/sequences/vector/db_cback.pass.cpp
index 9ad0fb929..1c516ba57 100644
--- a/test/libcxx/containers/sequences/vector/db_cback.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_cback.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -46,8 +45,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_cfront.pass.cpp b/test/libcxx/containers/sequences/vector/db_cfront.pass.cpp
index 58f57a500..1dc7211f2 100644
--- a/test/libcxx/containers/sequences/vector/db_cfront.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_cfront.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -46,8 +45,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_cindex.pass.cpp b/test/libcxx/containers/sequences/vector/db_cindex.pass.cpp
index 9a54b6cb9..ceab50a86 100644
--- a/test/libcxx/containers/sequences/vector/db_cindex.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_cindex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -48,8 +47,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_front.pass.cpp b/test/libcxx/containers/sequences/vector/db_front.pass.cpp
index 0acb7df0c..a4aafcaef 100644
--- a/test/libcxx/containers/sequences/vector/db_front.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_index.pass.cpp b/test/libcxx/containers/sequences/vector/db_index.pass.cpp
index 75ae095f2..a17ba2742 100644
--- a/test/libcxx/containers/sequences/vector/db_index.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_iterators_2.pass.cpp b/test/libcxx/containers/sequences/vector/db_iterators_2.pass.cpp
index d5e8c8610..975b5e951 100644
--- a/test/libcxx/containers/sequences/vector/db_iterators_2.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_iterators_2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -48,8 +47,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_iterators_3.pass.cpp b/test/libcxx/containers/sequences/vector/db_iterators_3.pass.cpp
index 96a75204a..0dcd6e7f2 100644
--- a/test/libcxx/containers/sequences/vector/db_iterators_3.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_iterators_3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -48,8 +47,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_iterators_4.pass.cpp b/test/libcxx/containers/sequences/vector/db_iterators_4.pass.cpp
index 311a517cf..8d048f2fd 100644
--- a/test/libcxx/containers/sequences/vector/db_iterators_4.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_iterators_4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_iterators_5.pass.cpp b/test/libcxx/containers/sequences/vector/db_iterators_5.pass.cpp
index 6df3fd459..19060da3d 100644
--- a/test/libcxx/containers/sequences/vector/db_iterators_5.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_iterators_5.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -54,8 +53,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_iterators_6.pass.cpp b/test/libcxx/containers/sequences/vector/db_iterators_6.pass.cpp
index 0785dd964..13156c22f 100644
--- a/test/libcxx/containers/sequences/vector/db_iterators_6.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_iterators_6.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -52,8 +51,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_iterators_7.pass.cpp b/test/libcxx/containers/sequences/vector/db_iterators_7.pass.cpp
index 11ba9f864..943c5209b 100644
--- a/test/libcxx/containers/sequences/vector/db_iterators_7.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -52,8 +51,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/db_iterators_8.pass.cpp b/test/libcxx/containers/sequences/vector/db_iterators_8.pass.cpp
index 0434ad5f1..39f26f668 100644
--- a/test/libcxx/containers/sequences/vector/db_iterators_8.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/db_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -48,8 +47,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/sequences/vector/pop_back_empty.pass.cpp b/test/libcxx/containers/sequences/vector/pop_back_empty.pass.cpp
index 388dfa4e1..1d1e3a1ba 100644
--- a/test/libcxx/containers/sequences/vector/pop_back_empty.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/pop_back_empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <vector>
 
 
-int main() {
+int main(int, char**) {
     std::vector<int> v;
     v.push_back(0);
     v.pop_back();
     v.pop_back();
     std::exit(1);
+
+  return 0;
 }
diff --git a/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp b/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
new file mode 100644
index 000000000..81263dec0
--- /dev/null
+++ b/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <vector>
+
+// template <class InputIter> vector(InputIter first, InputIter last);
+
+#include <vector>
+#include <cassert>
+
+#include "min_allocator.h"
+
+void test_ctor_under_alloc() {
+  int arr1[] = {42};
+  int arr2[] = {1, 101, 42};
+  {
+    typedef std::vector<int, cpp03_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3);
+      assert(Alloc::construct_called);
+    }
+  }
+  {
+    typedef std::vector<int, cpp03_overload_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3);
+      assert(Alloc::construct_called);
+    }
+  }
+}
+
+int main(int, char**) {
+  test_ctor_under_alloc();
+
+  return 0;
+}
diff --git a/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp b/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
new file mode 100644
index 000000000..0100507ea
--- /dev/null
+++ b/test/libcxx/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <vector>
+
+// template <class InputIter> vector(InputIter first, InputIter last,
+//                                   const allocator_type& a);
+
+#include <vector>
+#include <cassert>
+
+#include "min_allocator.h"
+
+void test_ctor_under_alloc() {
+  int arr1[] = {42};
+  int arr2[] = {1, 101, 42};
+  {
+    typedef std::vector<int, cpp03_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    Alloc a;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1, a);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3, a);
+      assert(Alloc::construct_called);
+    }
+  }
+  {
+    typedef std::vector<int, cpp03_overload_allocator<int> > C;
+    typedef C::allocator_type Alloc;
+    Alloc a;
+    {
+      Alloc::construct_called = false;
+      C v(arr1, arr1 + 1, a);
+      assert(Alloc::construct_called);
+    }
+    {
+      Alloc::construct_called = false;
+      C v(arr2, arr2 + 3, a);
+      assert(Alloc::construct_called);
+    }
+  }
+}
+
+int main(int, char**) {
+  test_ctor_under_alloc();
+
+  return 0;
+}
diff --git a/test/libcxx/containers/sequences/vector/version.pass.cpp b/test/libcxx/containers/sequences/vector/version.pass.cpp
index 2c4fa1263..93fd2e679 100644
--- a/test/libcxx/containers/sequences/vector/version.pass.cpp
+++ b/test/libcxx/containers/sequences/vector/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/unord/key_value_traits.pass.cpp b/test/libcxx/containers/unord/key_value_traits.pass.cpp
index a6d1ea7a5..c5e420387 100644
--- a/test/libcxx/containers/unord/key_value_traits.pass.cpp
+++ b/test/libcxx/containers/unord/key_value_traits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,6 +53,8 @@ void testKeyValueTrait() {
   }
 }
 
-int main() {
+int main(int, char**) {
   testKeyValueTrait();
+
+  return 0;
 }
diff --git a/test/libcxx/containers/unord/next_pow2.pass.cpp b/test/libcxx/containers/unord/next_pow2.pass.cpp
index a878da4f5..2b4d02eec 100644
--- a/test/libcxx/containers/unord/next_pow2.pass.cpp
+++ b/test/libcxx/containers/unord/next_pow2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -75,7 +74,7 @@ fuzz_unordered_map_reserve(unsigned num_inserts,
     assert(m.bucket_count() >= num_reserve2);
 }
 
-int main()
+int main(int, char**)
 {
     test_next_pow2();
 
diff --git a/test/libcxx/containers/unord/next_prime.pass.cpp b/test/libcxx/containers/unord/next_prime.pass.cpp
index 266d7f1f9..6a82ea1d6 100644
--- a/test/libcxx/containers/unord/next_prime.pass.cpp
+++ b/test/libcxx/containers/unord/next_prime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -37,7 +36,7 @@ is_prime(size_t n)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     assert(std::__next_prime(0) == 0);
     for (std::size_t n = 1; n <= 100000; ++n)
@@ -48,4 +47,6 @@ int main()
             assert(!is_prime(i));
         assert(is_prime(p));
     }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/unord/non_const_comparator.fail.cpp b/test/libcxx/containers/unord/non_const_comparator.fail.cpp
index f428ab9ac..8fa500e45 100644
--- a/test/libcxx/containers/unord/non_const_comparator.fail.cpp
+++ b/test/libcxx/containers/unord/non_const_comparator.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct BadEqual {
   }
 };
 
-int main() {
+int main(int, char**) {
   static_assert(!std::__invokable<BadEqual const&, int const&, int const&>::value, "");
   static_assert(std::__invokable<BadEqual&, int const&, int const&>::value, "");
 
@@ -55,4 +54,6 @@ int main() {
     using C = std::unordered_multimap<long, int, BadHash, BadEqual>;
     C s;
   }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/unord/unord.map/at.abort.pass.cpp b/test/libcxx/containers/unord/unord.map/at.abort.pass.cpp
new file mode 100644
index 000000000..b65af169b
--- /dev/null
+++ b/test/libcxx/containers/unord/unord.map/at.abort.pass.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <unordered_map>
+
+// class unordered_map
+
+// mapped_type& at(const key_type& k);
+
+// Make sure we abort() when exceptions are disabled and we fetch a key that
+// is not in the map.
+
+// REQUIRES: libcpp-no-exceptions
+// UNSUPPORTED: c++98, c++03
+
+#include <csignal>
+#include <cstdlib>
+#include <unordered_map>
+
+
+int main(int, char**) {
+    std::signal(SIGABRT, [](int) { std::_Exit(EXIT_SUCCESS); });
+    std::unordered_map<int, int> map;
+    map.at(1);
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/containers/unord/unord.map/at.const.abort.pass.cpp b/test/libcxx/containers/unord/unord.map/at.const.abort.pass.cpp
new file mode 100644
index 000000000..af2a2cd76
--- /dev/null
+++ b/test/libcxx/containers/unord/unord.map/at.const.abort.pass.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <unordered_map>
+
+// class unordered_map
+
+// const mapped_type& at(const key_type& k) const;
+
+// Make sure we abort() when exceptions are disabled and we fetch a key that
+// is not in the map.
+
+// REQUIRES: libcpp-no-exceptions
+// UNSUPPORTED: c++98, c++03
+
+#include <csignal>
+#include <cstdlib>
+#include <unordered_map>
+
+
+int main(int, char**) {
+    std::signal(SIGABRT, [](int) { std::_Exit(EXIT_SUCCESS); });
+    std::unordered_map<int, int> const map;
+    map.at(1);
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/containers/unord/unord.map/db_iterators_7.pass.cpp b/test/libcxx/containers/unord/unord.map/db_iterators_7.pass.cpp
index 664cb7e86..9ff6bafc3 100644
--- a/test/libcxx/containers/unord/unord.map/db_iterators_7.pass.cpp
+++ b/test/libcxx/containers/unord/unord.map/db_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_map<int, std::string> C;
@@ -54,8 +53,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/unord/unord.map/db_iterators_8.pass.cpp b/test/libcxx/containers/unord/unord.map/db_iterators_8.pass.cpp
index 621d7f343..ef383aa9f 100644
--- a/test/libcxx/containers/unord/unord.map/db_iterators_8.pass.cpp
+++ b/test/libcxx/containers/unord/unord.map/db_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_map<int, std::string> C;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/unord/unord.map/db_local_iterators_7.pass.cpp b/test/libcxx/containers/unord/unord.map/db_local_iterators_7.pass.cpp
index 19794e047..5c2b4024a 100644
--- a/test/libcxx/containers/unord/unord.map/db_local_iterators_7.pass.cpp
+++ b/test/libcxx/containers/unord/unord.map/db_local_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_map<int, std::string> C;
@@ -51,8 +50,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/unord/unord.map/db_local_iterators_8.pass.cpp b/test/libcxx/containers/unord/unord.map/db_local_iterators_8.pass.cpp
index 1567caf9b..8e76f1bda 100644
--- a/test/libcxx/containers/unord/unord.map/db_local_iterators_8.pass.cpp
+++ b/test/libcxx/containers/unord/unord.map/db_local_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_map<int, std::string> C;
@@ -48,8 +47,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/containers/unord/unord.map/version.pass.cpp b/test/libcxx/containers/unord/unord.map/version.pass.cpp
index fc47a326c..983acde54 100644
--- a/test/libcxx/containers/unord/unord.map/version.pass.cpp
+++ b/test/libcxx/containers/unord/unord.map/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp b/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
index d6554a63c..af94748fd 100644
--- a/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
+++ b/test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ struct GoodHashNoDefault {
   size_t operator()(T const&) const { return 0; }
 };
 
-int main() {
+int main(int, char**) {
 
   {
     using Set = std::unordered_set<VT>;
@@ -67,4 +66,6 @@ int main() {
     using Set = std::unordered_set<int, GoodHashNoDefault>;
     Set s(/*bucketcount*/42, GoodHashNoDefault(nullptr));
   }
+
+  return 0;
 }
diff --git a/test/libcxx/containers/unord/unord.set/version.pass.cpp b/test/libcxx/containers/unord/unord.set/version.pass.cpp
index d651ebdfc..63144528c 100644
--- a/test/libcxx/containers/unord/unord.set/version.pass.cpp
+++ b/test/libcxx/containers/unord/unord.set/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/debug/containers/db_associative_container_tests.pass.cpp b/test/libcxx/debug/containers/db_associative_container_tests.pass.cpp
index a727b31e4..d6c231527 100644
--- a/test/libcxx/debug/containers/db_associative_container_tests.pass.cpp
+++ b/test/libcxx/debug/containers/db_associative_container_tests.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ private:
   // FIXME Add tests here
 };
 
-int main()
+int main(int, char**)
 {
   using SetAlloc = test_allocator<int>;
   using MapAlloc = test_allocator<std::pair<const int, int>>;
@@ -67,4 +66,6 @@ int main()
     AssociativeContainerChecks<
         std::multimap<int, int, std::less<int>, MapAlloc>, CT_MultiMap>::run();
   }
+
+  return 0;
 }
diff --git a/test/libcxx/debug/containers/db_sequence_container_iterators.pass.cpp b/test/libcxx/debug/containers/db_sequence_container_iterators.pass.cpp
index 57d16c272..d05f9df3b 100644
--- a/test/libcxx/debug/containers/db_sequence_container_iterators.pass.cpp
+++ b/test/libcxx/debug/containers/db_sequence_container_iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -308,7 +307,7 @@ private:
   }
 };
 
-int main()
+int main(int, char**)
 {
   using Alloc = test_allocator<int>;
   {
@@ -324,4 +323,6 @@ int main()
     SequenceContainerChecks<
         std::deque<int, Alloc>, CT_Deque>::run();
   }
+
+  return 0;
 }
diff --git a/test/libcxx/debug/containers/db_string.pass.cpp b/test/libcxx/debug/containers/db_string.pass.cpp
index f6434d5c7..b2812fca6 100644
--- a/test/libcxx/debug/containers/db_string.pass.cpp
+++ b/test/libcxx/debug/containers/db_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -94,7 +93,9 @@ private:
   }
 };
 
-int main()
+int main(int, char**)
 {
   StringContainerChecks<>::run();
+
+  return 0;
 }
diff --git a/test/libcxx/debug/containers/db_unord_container_tests.pass.cpp b/test/libcxx/debug/containers/db_unord_container_tests.pass.cpp
index d6a31e366..8a6da0826 100644
--- a/test/libcxx/debug/containers/db_unord_container_tests.pass.cpp
+++ b/test/libcxx/debug/containers/db_unord_container_tests.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ private:
 
 };
 
-int main()
+int main(int, char**)
 {
   using SetAlloc = test_allocator<int>;
   using MapAlloc = test_allocator<std::pair<const int, int>>;
@@ -68,4 +67,6 @@ int main()
         std::unordered_multiset<int, std::hash<int>, std::equal_to<int>, SetAlloc>,
         CT_UnorderedMultiSet>::run();
   }
+
+  return 0;
 }
diff --git a/test/libcxx/debug/debug_abort.pass.cpp b/test/libcxx/debug/debug_abort.pass.cpp
index 9a1b4753f..270f2cb0f 100644
--- a/test/libcxx/debug/debug_abort.pass.cpp
+++ b/test/libcxx/debug/debug_abort.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ void signal_handler(int signal)
     std::_Exit(EXIT_FAILURE);
 }
 
-int main()
+int main(int, char**)
 {
   if (std::signal(SIGABRT, signal_handler) != SIG_ERR)
     _LIBCPP_ASSERT(false, "foo");
diff --git a/test/libcxx/debug/debug_throw.pass.cpp b/test/libcxx/debug/debug_throw.pass.cpp
index d1c88400b..53e8538c4 100644
--- a/test/libcxx/debug/debug_throw.pass.cpp
+++ b/test/libcxx/debug/debug_throw.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <type_traits>
 #include <__debug>
 
-int main()
+int main(int, char**)
 {
   {
     std::__libcpp_debug_function = std::__libcpp_throw_debug_function;
@@ -38,4 +37,6 @@ int main()
                                   std::__libcpp_debug_exception
                   >::value), "must be an exception");
   }
+
+  return 0;
 }
diff --git a/test/libcxx/debug/debug_throw_register.pass.cpp b/test/libcxx/debug/debug_throw_register.pass.cpp
index 0d2586bf3..23b4091c3 100644
--- a/test/libcxx/debug/debug_throw_register.pass.cpp
+++ b/test/libcxx/debug/debug_throw_register.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,10 +26,12 @@
 #include <__debug>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
   try {
     _LIBCPP_ASSERT(false, "foo");
     assert(false);
   } catch (...) {}
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.cxx1z.pass.cpp b/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.cxx1z.pass.cpp
index 41ddb179f..7f59ca202 100644
--- a/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.cxx1z.pass.cpp
+++ b/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.cxx1z.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,9 @@
 #include <memory>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::auto_ptr<int> p;
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.fail.cpp b/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.fail.cpp
index 3ad9ae8d6..db4ac4aae 100644
--- a/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.fail.cpp
+++ b/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,9 +30,11 @@
 #include <memory>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::auto_ptr<int> AP; // expected-error{{'auto_ptr<int>' is deprecated}}
     typedef std::auto_ptr<void> APV; // expected-error{{'auto_ptr<void>' is deprecated}}
     typedef std::auto_ptr_ref<int> APR; // expected-error{{'auto_ptr_ref<int>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.c.headers/ciso646.pass.cpp b/test/libcxx/depr/depr.c.headers/ciso646.pass.cpp
index 725a7ab13..7a8399414 100644
--- a/test/libcxx/depr/depr.c.headers/ciso646.pass.cpp
+++ b/test/libcxx/depr/depr.c.headers/ciso646.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.c.headers/complex.h.pass.cpp b/test/libcxx/depr/depr.c.headers/complex.h.pass.cpp
index 7abe8e0a0..07529aef2 100644
--- a/test/libcxx/depr/depr.c.headers/complex.h.pass.cpp
+++ b/test/libcxx/depr/depr.c.headers/complex.h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::complex<double> d;
     (void)d;
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp b/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp
index d4d8b5faf..24a104f5e 100644
--- a/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp
+++ b/test/libcxx/depr/depr.c.headers/extern_c.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,4 +39,6 @@ extern "C" {
 #include <wctype.h>
 }
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/depr/depr.c.headers/fenv.pass.cpp b/test/libcxx/depr/depr.c.headers/fenv.pass.cpp
new file mode 100644
index 000000000..9cc7063e8
--- /dev/null
+++ b/test/libcxx/depr/depr.c.headers/fenv.pass.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <fenv.h>
+
+#include <fenv.h>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main()
+{
+}
diff --git a/test/libcxx/depr/depr.c.headers/locale_h.pass.cpp b/test/libcxx/depr/depr.c.headers/locale_h.pass.cpp
index bd4d3501d..ea117f6b2 100644
--- a/test/libcxx/depr/depr.c.headers/locale_h.pass.cpp
+++ b/test/libcxx/depr/depr.c.headers/locale_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.c.headers/math_h.sh.cpp b/test/libcxx/depr/depr.c.headers/math_h.sh.cpp
index 8048865c3..8e0fad78d 100644
--- a/test/libcxx/depr/depr.c.headers/math_h.sh.cpp
+++ b/test/libcxx/depr/depr.c.headers/math_h.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/depr/depr.c.headers/tgmath_h.pass.cpp b/test/libcxx/depr/depr.c.headers/tgmath_h.pass.cpp
index 931e3a32f..835e2f216 100644
--- a/test/libcxx/depr/depr.c.headers/tgmath_h.pass.cpp
+++ b/test/libcxx/depr/depr.c.headers/tgmath_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,10 +14,12 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::complex<double> cd;
     (void)cd;
     double x = sin(1.0);
     (void)x; // to placate scan-build
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.fail.cpp b/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.fail.cpp
index 88c1e21d6..e26a75498 100644
--- a/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.fail.cpp
+++ b/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct Foo {
     int identity(int v) { return v; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pointer_to_unary_function<int, int> PUF; // expected-error{{'pointer_to_unary_function<int, int>' is deprecated}}
     typedef std::pointer_to_binary_function<int, int, int> PBF; // expected-error{{'pointer_to_binary_function<int, int, int>' is deprecated}}
@@ -56,4 +55,6 @@ int main()
     std::mem_fun_ref<int, Foo, int>(&Foo::identity); // expected-error{{'mem_fun_ref<int, Foo, int>' is deprecated}}
     std::mem_fun_ref<int, Foo>(&Foo::const_zero); // expected-error{{'mem_fun_ref<int, Foo>' is deprecated}}
     std::mem_fun_ref<int, Foo, int>(&Foo::const_identity); // expected-error{{'mem_fun_ref<int, Foo, int>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.function.objects/depr.adaptors.cxx1z.pass.cpp b/test/libcxx/depr/depr.function.objects/depr.adaptors.cxx1z.pass.cpp
index beb560800..7b759d04b 100644
--- a/test/libcxx/depr/depr.function.objects/depr.adaptors.cxx1z.pass.cpp
+++ b/test/libcxx/depr/depr.function.objects/depr.adaptors.cxx1z.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct Foo {
   int sum(int a, int b) const { return a + b; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pointer_to_unary_function<int, int> PUF;
     typedef std::pointer_to_binary_function<int, int, int> PBF;
@@ -61,4 +60,6 @@ int main()
 
     assert((std::mem_fun_ref(&Foo::zero)(f) == 0));
     assert((std::mem_fun_ref(&Foo::identity)(f, 5) == 5));
+
+  return 0;
 }
diff --git a/test/libcxx/depr/depr.str.strstreams/version.pass.cpp b/test/libcxx/depr/depr.str.strstreams/version.pass.cpp
index f27665f15..148f233ce 100644
--- a/test/libcxx/depr/depr.str.strstreams/version.pass.cpp
+++ b/test/libcxx/depr/depr.str.strstreams/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/depr/enable_removed_cpp17_features.pass.cpp b/test/libcxx/depr/enable_removed_cpp17_features.pass.cpp
index 9f8a9c088..2065b2b4e 100644
--- a/test/libcxx/depr/enable_removed_cpp17_features.pass.cpp
+++ b/test/libcxx/depr/enable_removed_cpp17_features.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,5 +21,7 @@
 #error _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR must be defined
 #endif
 
-int main() {
+int main(int, char**) {
+
+  return 0;
 }
diff --git a/test/libcxx/depr/exception.unexpected/get_unexpected.pass.cpp b/test/libcxx/depr/exception.unexpected/get_unexpected.pass.cpp
index 55e23b9ed..ca14271f0 100644
--- a/test/libcxx/depr/exception.unexpected/get_unexpected.pass.cpp
+++ b/test/libcxx/depr/exception.unexpected/get_unexpected.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ void f3()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
 
     std::unexpected_handler old = std::get_unexpected();
@@ -39,4 +38,6 @@ int main()
     std::set_terminate(f3);
     (*old)();
     assert(0);
+
+  return 0;
 }
diff --git a/test/libcxx/depr/exception.unexpected/set_unexpected.pass.cpp b/test/libcxx/depr/exception.unexpected/set_unexpected.pass.cpp
index c4915dd10..dd861941a 100644
--- a/test/libcxx/depr/exception.unexpected/set_unexpected.pass.cpp
+++ b/test/libcxx/depr/exception.unexpected/set_unexpected.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ void f3()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     std::unexpected_handler old = std::set_unexpected(f1);
     // verify there is a previous unexpected handler
@@ -34,4 +33,6 @@ int main()
     std::set_terminate(f3);
     (*old)();
     assert(0);
+
+  return 0;
 }
diff --git a/test/libcxx/depr/exception.unexpected/unexpected.pass.cpp b/test/libcxx/depr/exception.unexpected/unexpected.pass.cpp
index 7a84b92ca..b9bdabe0e 100644
--- a/test/libcxx/depr/exception.unexpected/unexpected.pass.cpp
+++ b/test/libcxx/depr/exception.unexpected/unexpected.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,9 +19,11 @@ void fexit()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     std::set_unexpected(fexit);
     std::unexpected();
     assert(false);
+
+  return 0;
 }
diff --git a/test/libcxx/depr/exception.unexpected/unexpected_disabled_cpp17.fail.cpp b/test/libcxx/depr/exception.unexpected/unexpected_disabled_cpp17.fail.cpp
index 2a2917625..0388cfaf7 100644
--- a/test/libcxx/depr/exception.unexpected/unexpected_disabled_cpp17.fail.cpp
+++ b/test/libcxx/depr/exception.unexpected/unexpected_disabled_cpp17.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 void f() {}
 
-int main() {
+int main(int, char**) {
   using T = std::unexpected_handler; // expected-error {{no type named 'unexpected_handler' in namespace 'std'}}
   std::unexpected(); // expected-error {{no member named 'unexpected' in namespace 'std'}}
   std::get_unexpected(); // expected-error {{no member named 'get_unexpected' in namespace 'std'}}
   std::set_unexpected(f); // expected-error {{no type named 'set_unexpected' in namespace 'std'}}
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/assertions/version_cassert.pass.cpp b/test/libcxx/diagnostics/assertions/version_cassert.pass.cpp
index f123a0525..f2fb09524 100644
--- a/test/libcxx/diagnostics/assertions/version_cassert.pass.cpp
+++ b/test/libcxx/diagnostics/assertions/version_cassert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/enable_nodiscard.fail.cpp b/test/libcxx/diagnostics/enable_nodiscard.fail.cpp
index e1ef17672..0cd74be2f 100644
--- a/test/libcxx/diagnostics/enable_nodiscard.fail.cpp
+++ b/test/libcxx/diagnostics/enable_nodiscard.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,9 +24,11 @@
 _LIBCPP_NODISCARD_EXT int foo() { return 42; }
 _LIBCPP_NODISCARD_AFTER_CXX17 int bar() { return 42; }
 
-int main() {
+int main(int, char**) {
   foo(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
   bar(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
   (void)foo(); // OK. void casts disable the diagnostic.
   (void)bar();
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/enable_nodiscard_disable_after_cxx17.fail.cpp b/test/libcxx/diagnostics/enable_nodiscard_disable_after_cxx17.fail.cpp
index 2c7d899ff..530ea54ca 100644
--- a/test/libcxx/diagnostics/enable_nodiscard_disable_after_cxx17.fail.cpp
+++ b/test/libcxx/diagnostics/enable_nodiscard_disable_after_cxx17.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@
 _LIBCPP_NODISCARD_EXT int foo() { return 42; }
 _LIBCPP_NODISCARD_AFTER_CXX17 int bar() { return 42; }
 
-int main() {
+int main(int, char**) {
   foo(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
   bar(); // OK.
   (void)foo(); // OK.
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/enable_nodiscard_disable_nodiscard_ext.fail.cpp b/test/libcxx/diagnostics/enable_nodiscard_disable_nodiscard_ext.fail.cpp
index c7d080d84..56df9248d 100644
--- a/test/libcxx/diagnostics/enable_nodiscard_disable_nodiscard_ext.fail.cpp
+++ b/test/libcxx/diagnostics/enable_nodiscard_disable_nodiscard_ext.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,8 +23,10 @@
 _LIBCPP_NODISCARD_EXT int foo() { return 42; }
 _LIBCPP_NODISCARD_AFTER_CXX17 int bar() { return 42; }
 
-int main() {
+int main(int, char**) {
   bar(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
   foo(); // OK.
   (void)bar(); // OK.
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/errno/version_cerrno.pass.cpp b/test/libcxx/diagnostics/errno/version_cerrno.pass.cpp
index 7cd2be8ef..a8c51c013 100644
--- a/test/libcxx/diagnostics/errno/version_cerrno.pass.cpp
+++ b/test/libcxx/diagnostics/errno/version_cerrno.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,4 +15,6 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/diagnostics/nodiscard.pass.cpp b/test/libcxx/diagnostics/nodiscard.pass.cpp
index de920d459..1db9a67a8 100644
--- a/test/libcxx/diagnostics/nodiscard.pass.cpp
+++ b/test/libcxx/diagnostics/nodiscard.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 
 _LIBCPP_NODISCARD_EXT int foo() { return 42; }
 
-int main() {
+int main(int, char**) {
   foo(); // OK.
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/nodiscard_aftercxx17.fail.cpp b/test/libcxx/diagnostics/nodiscard_aftercxx17.fail.cpp
index 47e560feb..8cfbc3117 100644
--- a/test/libcxx/diagnostics/nodiscard_aftercxx17.fail.cpp
+++ b/test/libcxx/diagnostics/nodiscard_aftercxx17.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 
 _LIBCPP_NODISCARD_AFTER_CXX17 int foo() { return 6; }
 
-int main ()
+int main(int, char**)
 {
 	foo();	// expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/nodiscard_aftercxx17.pass.cpp b/test/libcxx/diagnostics/nodiscard_aftercxx17.pass.cpp
index 4db818172..959ba4854 100644
--- a/test/libcxx/diagnostics/nodiscard_aftercxx17.pass.cpp
+++ b/test/libcxx/diagnostics/nodiscard_aftercxx17.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 
 _LIBCPP_NODISCARD_AFTER_CXX17 int foo() { return 6; }
 
-int main ()
+int main(int, char**)
 {
 	foo();	// no error here!
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/nodiscard_extensions.fail.cpp b/test/libcxx/diagnostics/nodiscard_extensions.fail.cpp
index d1e0a8af5..a265e8755 100644
--- a/test/libcxx/diagnostics/nodiscard_extensions.fail.cpp
+++ b/test/libcxx/diagnostics/nodiscard_extensions.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,9 +26,11 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   {
     // expected-error-re@+1 {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
     std::get_temporary_buffer<int>(1);
   }
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp b/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp
index 9a09a43ba..87615fbd0 100644
--- a/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp
+++ b/test/libcxx/diagnostics/nodiscard_extensions.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   {
     std::get_temporary_buffer<int>(1); // intentional memory leak.
   }
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/std.exceptions/version.pass.cpp b/test/libcxx/diagnostics/std.exceptions/version.pass.cpp
index d9ab009a4..147f4d2b9 100644
--- a/test/libcxx/diagnostics/std.exceptions/version.pass.cpp
+++ b/test/libcxx/diagnostics/std.exceptions/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/diagnostics/syserr/version.pass.cpp b/test/libcxx/diagnostics/syserr/version.pass.cpp
index 3851150fd..4b987a668 100644
--- a/test/libcxx/diagnostics/syserr/version.pass.cpp
+++ b/test/libcxx/diagnostics/syserr/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/double_include.sh.cpp b/test/libcxx/double_include.sh.cpp
index 5a0f2ba72..2ee444af5 100644
--- a/test/libcxx/double_include.sh.cpp
+++ b/test/libcxx/double_include.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,6 +63,7 @@
 #include <deque>
 #include <errno.h>
 #include <exception>
+#include <fenv.h>
 #include <filesystem>
 #include <float.h>
 #include <forward_list>
@@ -169,5 +169,5 @@
 #include <ext/hash_set>
 
 #if defined(WITH_MAIN)
-int main() {}
+int main(int, char**) { return 0; }
 #endif
diff --git a/test/libcxx/experimental/algorithms/header.algorithm.synop/includes.pass.cpp b/test/libcxx/experimental/algorithms/header.algorithm.synop/includes.pass.cpp
index accdd699c..271e94347 100644
--- a/test/libcxx/experimental/algorithms/header.algorithm.synop/includes.pass.cpp
+++ b/test/libcxx/experimental/algorithms/header.algorithm.synop/includes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #  error "<experimental/algorithm> must include <algorithm>"
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/algorithms/version.pass.cpp b/test/libcxx/experimental/algorithms/version.pass.cpp
index 6d9d0c6b2..c43ad68a9 100644
--- a/test/libcxx/experimental/algorithms/version.pass.cpp
+++ b/test/libcxx/experimental/algorithms/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #  error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/diagnostics/syserr/use_header_warning.fail.cpp b/test/libcxx/experimental/diagnostics/syserr/use_header_warning.fail.cpp
new file mode 100644
index 000000000..a7fef5e73
--- /dev/null
+++ b/test/libcxx/experimental/diagnostics/syserr/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/system_error>
+
+#include <experimental/system_error>
+
+// expected-error@experimental/system_error:* {{"<experimental/system_error> has been removed. Use <system_error> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/diagnostics/syserr/version.pass.cpp b/test/libcxx/experimental/diagnostics/syserr/version.pass.cpp
new file mode 100644
index 000000000..4f6d28c4c
--- /dev/null
+++ b/test/libcxx/experimental/diagnostics/syserr/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/system_error>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/system_error>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/filesystem/version.pass.cpp b/test/libcxx/experimental/filesystem/version.pass.cpp
index d5f36a6b3..d8b2cbbd1 100644
--- a/test/libcxx/experimental/filesystem/version.pass.cpp
+++ b/test/libcxx/experimental/filesystem/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/language.support/support.coroutines/dialect_support.sh.cpp b/test/libcxx/experimental/language.support/support.coroutines/dialect_support.sh.cpp
index 56f47c8fa..237fbc4bb 100644
--- a/test/libcxx/experimental/language.support/support.coroutines/dialect_support.sh.cpp
+++ b/test/libcxx/experimental/language.support/support.coroutines/dialect_support.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,10 +49,12 @@ MyFuture test_coro() {
   co_return;
 }
 
-int main()
+int main(int, char**)
 {
   MyFuture f = test_coro();
   while (!f.p.done())
     f.p.resume();
   f.p.destroy();
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/language.support/support.coroutines/version.sh.cpp b/test/libcxx/experimental/language.support/support.coroutines/version.sh.cpp
index 229ce10dd..b11ea931f 100644
--- a/test/libcxx/experimental/language.support/support.coroutines/version.sh.cpp
+++ b/test/libcxx/experimental/language.support/support.coroutines/version.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,6 +19,8 @@
 #error _LIBCPP_VERSION must be defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp b/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
index b2150fcd2..e12d31d5f 100644
--- a/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -104,7 +103,7 @@ struct CountCopiesAllocV2 {
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         using T = CountCopies;
@@ -168,4 +167,6 @@ int main()
         assert(p.first.alloc == h.M);
         assert(p.second.count == 2);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/db_deallocate.pass.cpp b/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/db_deallocate.pass.cpp
index 020133fc4..38fa265f8 100644
--- a/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/db_deallocate.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/db_deallocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ int AssertCount = 0;
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using Alloc = ex::polymorphic_allocator<int>;
     using Traits = std::allocator_traits<Alloc>;
@@ -39,4 +38,6 @@ int main()
     assert(AssertCount == 0);
     a.deallocate(nullptr, maxSize + 1);
     assert(AssertCount == 1);
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/db_deallocate.pass.cpp b/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/db_deallocate.pass.cpp
index ffcedf0bf..d7a56be43 100644
--- a/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/db_deallocate.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/db_deallocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ int AssertCount = 0;
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using Alloc = NullAllocator<char>;
 
@@ -42,4 +41,6 @@ int main()
     assert(AssertCount == 0);
     m1.deallocate(nullptr, maxSize + 1);
     assert(AssertCount >= 1);
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_deque_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_deque_libcpp_version.pass.cpp
index 04b361dfe..53423a7a7 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_deque_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_deque_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_forward_list_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_forward_list_libcpp_version.pass.cpp
index 11fc21b3b..8f71d91ab 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_forward_list_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_forward_list_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_list_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_list_libcpp_version.pass.cpp
index 9a72979e0..3cdf4794d 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_list_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_list_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_map_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_map_libcpp_version.pass.cpp
index 24a1bf304..94b636f66 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_map_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_map_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_regex_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_regex_libcpp_version.pass.cpp
index ff81bc09b..a34c52301 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_regex_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_regex_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_set_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_set_libcpp_version.pass.cpp
index 6b02f46b4..70e34c9b0 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_set_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_set_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_string_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_string_libcpp_version.pass.cpp
index b4b7fdf10..7969b4f25 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_string_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_string_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_map_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_map_libcpp_version.pass.cpp
index ab9cc189b..71cfb2c1e 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_map_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_map_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_set_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_set_libcpp_version.pass.cpp
index 37533c7fd..55a992c71 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_set_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_unordered_set_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.aliases/header_vector_libcpp_version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.aliases/header_vector_libcpp_version.pass.cpp
index 103d32bec..89a8fb0aa 100644
--- a/test/libcxx/experimental/memory/memory.resource.aliases/header_vector_libcpp_version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.aliases/header_vector_libcpp_version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error header must provide _LIBCPP_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp b/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
index 341a88c0b..abd737e08 100644
--- a/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.global/global_memory_resource_lifetime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,8 +53,10 @@ ex::memory_resource* resource = ex::get_default_resource();
 POSType constructed_after_resources(resource, resource->allocate(1024), 1024);
 POSType constructed_after_resources2(nullptr, resource->allocate(1024), 1024);
 
-int main()
+int main(int, char**)
 {
     swap(constructed_after_resources, constructed_before_resources);
     swap(constructed_before_resources2, constructed_after_resources2);
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp b/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
index 9b92d02bc..dc2e9161f 100644
--- a/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.global/new_delete_resource_lifetime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,9 @@ ex::memory_resource* resource = ex::new_delete_resource();
 
 POSType constructed_after_resources(resource, resource->allocate(1024), 1024);
 
-int main()
+int main(int, char**)
 {
     swap(constructed_after_resources, constructed_before_resources);
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/memory/memory.resource.synop/version.pass.cpp b/test/libcxx/experimental/memory/memory.resource.synop/version.pass.cpp
index d05575e88..e8d628581 100644
--- a/test/libcxx/experimental/memory/memory.resource.synop/version.pass.cpp
+++ b/test/libcxx/experimental/memory/memory.resource.synop/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/numerics/numeric.ops/use_header_warning.fail.cpp b/test/libcxx/experimental/numerics/numeric.ops/use_header_warning.fail.cpp
new file mode 100644
index 000000000..d675acc26
--- /dev/null
+++ b/test/libcxx/experimental/numerics/numeric.ops/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/numeric>
+
+#include <experimental/numeric>
+
+// expected-error@experimental/numeric:* {{"<experimental/numeric> has been removed. Use <numeric> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/numerics/numeric.ops/version.pass.cpp b/test/libcxx/experimental/numerics/numeric.ops/version.pass.cpp
new file mode 100644
index 000000000..f8b642d07
--- /dev/null
+++ b/test/libcxx/experimental/numerics/numeric.ops/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/numeric>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/numeric>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/strings/string.view/use_header_warning.fail.cpp b/test/libcxx/experimental/strings/string.view/use_header_warning.fail.cpp
new file mode 100644
index 000000000..139bc2d1f
--- /dev/null
+++ b/test/libcxx/experimental/strings/string.view/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/string_view>
+
+#include <experimental/string_view>
+
+// expected-error@experimental/string_view:* {{"<experimental/string_view> has been removed. Use <string_view> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/strings/string.view/version.pass.cpp b/test/libcxx/experimental/strings/string.view/version.pass.cpp
new file mode 100644
index 000000000..7300a5501
--- /dev/null
+++ b/test/libcxx/experimental/strings/string.view/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/string_view>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/string_view>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/any/use_header_warning.fail.cpp b/test/libcxx/experimental/utilities/any/use_header_warning.fail.cpp
new file mode 100644
index 000000000..1b8918e80
--- /dev/null
+++ b/test/libcxx/experimental/utilities/any/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/any>
+
+#include <experimental/any>
+
+// expected-error@experimental/any:* {{"<experimental/any> has been removed. Use <any> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/any/version.pass.cpp b/test/libcxx/experimental/utilities/any/version.pass.cpp
new file mode 100644
index 000000000..ecfdecfea
--- /dev/null
+++ b/test/libcxx/experimental/utilities/any/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/any>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/any>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/meta/version.pass.cpp b/test/libcxx/experimental/utilities/meta/version.pass.cpp
index 593fb52a4..3568c6fe5 100644
--- a/test/libcxx/experimental/utilities/meta/version.pass.cpp
+++ b/test/libcxx/experimental/utilities/meta/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/experimental/utilities/optional/use_header_warning.fail.cpp b/test/libcxx/experimental/utilities/optional/use_header_warning.fail.cpp
new file mode 100644
index 000000000..d2bb9e6e9
--- /dev/null
+++ b/test/libcxx/experimental/utilities/optional/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/optional>
+
+#include <experimental/optional>
+
+// expected-error@experimental/optional:* {{"<experimental/optional> has been removed. Use <optional> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/optional/version.pass.cpp b/test/libcxx/experimental/utilities/optional/version.pass.cpp
new file mode 100644
index 000000000..0e84f241a
--- /dev/null
+++ b/test/libcxx/experimental/utilities/optional/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/optional>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/optional>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/ratio/use_header_warning.fail.cpp b/test/libcxx/experimental/utilities/ratio/use_header_warning.fail.cpp
new file mode 100644
index 000000000..a6578ef48
--- /dev/null
+++ b/test/libcxx/experimental/utilities/ratio/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/ratio>
+
+#include <experimental/ratio>
+
+// expected-error@experimental/ratio:* {{"<experimental/ratio> has been removed. Use <ratio> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/ratio/version.pass.cpp b/test/libcxx/experimental/utilities/ratio/version.pass.cpp
new file mode 100644
index 000000000..0357c79ef
--- /dev/null
+++ b/test/libcxx/experimental/utilities/ratio/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/ratio>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/ratio>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/time/use_header_warning.fail.cpp b/test/libcxx/experimental/utilities/time/use_header_warning.fail.cpp
new file mode 100644
index 000000000..093d6fca4
--- /dev/null
+++ b/test/libcxx/experimental/utilities/time/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/chrono>
+
+#include <experimental/chrono>
+
+// expected-error@experimental/chrono:* {{"<experimental/chrono> has been removed. Use <chrono> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/time/version.pass.cpp b/test/libcxx/experimental/utilities/time/version.pass.cpp
new file mode 100644
index 000000000..5ff26f7b2
--- /dev/null
+++ b/test/libcxx/experimental/utilities/time/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/chrono>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/chrono>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/tuple/use_header_warning.fail.cpp b/test/libcxx/experimental/utilities/tuple/use_header_warning.fail.cpp
new file mode 100644
index 000000000..6b378c2ce
--- /dev/null
+++ b/test/libcxx/experimental/utilities/tuple/use_header_warning.fail.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/tuple>
+
+#include <experimental/tuple>
+
+// expected-error@experimental/tuple:* {{"<experimental/tuple> has been removed. Use <tuple> instead."}}
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/tuple/version.pass.cpp b/test/libcxx/experimental/utilities/tuple/version.pass.cpp
new file mode 100644
index 000000000..4c1e305a4
--- /dev/null
+++ b/test/libcxx/experimental/utilities/tuple/version.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/tuple>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/tuple>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/experimental/utilities/utility/version.pass.cpp b/test/libcxx/experimental/utilities/utility/version.pass.cpp
index 437712454..5ba32b1ca 100644
--- a/test/libcxx/experimental/utilities/utility/version.pass.cpp
+++ b/test/libcxx/experimental/utilities/utility/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/extensions/hash/specializations.fail.cpp b/test/libcxx/extensions/hash/specializations.fail.cpp
index 8eeffb580..f81ec5dac 100644
--- a/test/libcxx/extensions/hash/specializations.fail.cpp
+++ b/test/libcxx/extensions/hash/specializations.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 #include <ext/hash_map>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     assert(__gnu_cxx::hash<std::string>()(std::string()) == 0);  // error
+
+  return 0;
 }
diff --git a/test/libcxx/extensions/hash/specializations.pass.cpp b/test/libcxx/extensions/hash/specializations.pass.cpp
index a222b1eb5..9397bbc40 100644
--- a/test/libcxx/extensions/hash/specializations.pass.cpp
+++ b/test/libcxx/extensions/hash/specializations.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 #include <ext/hash_map>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     char str[] = "test";
     assert(__gnu_cxx::hash<const char *>()("test") ==
@@ -28,4 +27,6 @@ int main()
     assert(__gnu_cxx::hash<unsigned int>()(42) == 42);
     assert(__gnu_cxx::hash<long>()(42) == 42);
     assert(__gnu_cxx::hash<unsigned long>()(42) == 42);
+
+  return 0;
 }
diff --git a/test/libcxx/extensions/hash_map/const_iterator.fail.cpp b/test/libcxx/extensions/hash_map/const_iterator.fail.cpp
index e4c536e8f..db09e4080 100644
--- a/test/libcxx/extensions/hash_map/const_iterator.fail.cpp
+++ b/test/libcxx/extensions/hash_map/const_iterator.fail.cpp
@@ -1,18 +1,19 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include <ext/hash_map>
 
-int main()
+int main(int, char**)
 {
     __gnu_cxx::hash_map<int, int> m;
     m[1] = 1;
     const __gnu_cxx::hash_map<int, int> &cm = m;
     cm.find(1)->second = 2;  // error
+
+  return 0;
 }
diff --git a/test/libcxx/extensions/nothing_to_do.pass.cpp b/test/libcxx/extensions/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/libcxx/extensions/nothing_to_do.pass.cpp
+++ b/test/libcxx/extensions/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/fuzzing/nth_element.cpp b/test/libcxx/fuzzing/nth_element.cpp
index ee7f0d824..482aeb65f 100644
--- a/test/libcxx/fuzzing/nth_element.cpp
+++ b/test/libcxx/fuzzing/nth_element.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------- nth_element.cpp ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/partial_sort.cpp b/test/libcxx/fuzzing/partial_sort.cpp
index 0c5889dbd..4f3576663 100644
--- a/test/libcxx/fuzzing/partial_sort.cpp
+++ b/test/libcxx/fuzzing/partial_sort.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------------- partial_sort.cpp --------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/partial_sort_copy.cpp b/test/libcxx/fuzzing/partial_sort_copy.cpp
index 368eed11b..b569f55eb 100644
--- a/test/libcxx/fuzzing/partial_sort_copy.cpp
+++ b/test/libcxx/fuzzing/partial_sort_copy.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------- partial_sort_copy.cpp ------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/partition.cpp b/test/libcxx/fuzzing/partition.cpp
index 03eed8c92..0833e38e2 100644
--- a/test/libcxx/fuzzing/partition.cpp
+++ b/test/libcxx/fuzzing/partition.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- partition.cpp ----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/partition_copy.cpp b/test/libcxx/fuzzing/partition_copy.cpp
index 68d821f63..f336a14ca 100644
--- a/test/libcxx/fuzzing/partition_copy.cpp
+++ b/test/libcxx/fuzzing/partition_copy.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ partition_copy.cpp --------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/regex_ECMAScript.cpp b/test/libcxx/fuzzing/regex_ECMAScript.cpp
index 2e5712602..ca9a7dae5 100644
--- a/test/libcxx/fuzzing/regex_ECMAScript.cpp
+++ b/test/libcxx/fuzzing/regex_ECMAScript.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------- regex_ECMAScript.cpp ---------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ const char * test_cases[] = {
 
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/regex_POSIX.cpp b/test/libcxx/fuzzing/regex_POSIX.cpp
index f0bd28919..69f40de6d 100644
--- a/test/libcxx/fuzzing/regex_POSIX.cpp
+++ b/test/libcxx/fuzzing/regex_POSIX.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------- regex_POSIX.cpp ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ const char * test_cases[] = {
 
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/regex_awk.cpp b/test/libcxx/fuzzing/regex_awk.cpp
index 2e5712602..ca9a7dae5 100644
--- a/test/libcxx/fuzzing/regex_awk.cpp
+++ b/test/libcxx/fuzzing/regex_awk.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------- regex_ECMAScript.cpp ---------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ const char * test_cases[] = {
 
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/regex_egrep.cpp b/test/libcxx/fuzzing/regex_egrep.cpp
index 056869f52..f350f63e3 100644
--- a/test/libcxx/fuzzing/regex_egrep.cpp
+++ b/test/libcxx/fuzzing/regex_egrep.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ regex_egrep.cpp -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ const char * test_cases[] = {
 
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/regex_extended.cpp b/test/libcxx/fuzzing/regex_extended.cpp
index ac850eb5c..ae55f5bb8 100644
--- a/test/libcxx/fuzzing/regex_extended.cpp
+++ b/test/libcxx/fuzzing/regex_extended.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===---------------------- regex_extended.cpp ----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ const char * test_cases[] = {
 
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/regex_grep.cpp b/test/libcxx/fuzzing/regex_grep.cpp
index 5b1dda293..ac497b3a9 100644
--- a/test/libcxx/fuzzing/regex_grep.cpp
+++ b/test/libcxx/fuzzing/regex_grep.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ regex_grep.cpp ------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ const char * test_cases[] = {
 
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/sort.cpp b/test/libcxx/fuzzing/sort.cpp
index 4c468948d..43b9064de 100644
--- a/test/libcxx/fuzzing/sort.cpp
+++ b/test/libcxx/fuzzing/sort.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- sort.cpp ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/stable_partition.cpp b/test/libcxx/fuzzing/stable_partition.cpp
index c21e64890..b236190cb 100644
--- a/test/libcxx/fuzzing/stable_partition.cpp
+++ b/test/libcxx/fuzzing/stable_partition.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------- stable_partition.cpp ---------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/stable_sort.cpp b/test/libcxx/fuzzing/stable_sort.cpp
index 1a7bbb952..1c8ac4904 100644
--- a/test/libcxx/fuzzing/stable_sort.cpp
+++ b/test/libcxx/fuzzing/stable_sort.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ stable_sort.cpp ----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/unique.cpp b/test/libcxx/fuzzing/unique.cpp
index 4bfa25a2b..cab512eb8 100644
--- a/test/libcxx/fuzzing/unique.cpp
+++ b/test/libcxx/fuzzing/unique.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===--------------------------- unique.cpp -------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/fuzzing/unique_copy.cpp b/test/libcxx/fuzzing/unique_copy.cpp
index ed6fc7ea5..311eb4cf6 100644
--- a/test/libcxx/fuzzing/unique_copy.cpp
+++ b/test/libcxx/fuzzing/unique_copy.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------ unique_copy.cpp -----------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ const char * test_cases[] = {
 const size_t k_num_tests = sizeof(test_cases)/sizeof(test_cases[0]);
 
 
-int main ()
+int main(int, char**)
 {
 	for (size_t i = 0; i < k_num_tests; ++i)
 		{
diff --git a/test/libcxx/include_as_c.sh.cpp b/test/libcxx/include_as_c.sh.cpp
index db50d835e..67d5e14b3 100644
--- a/test/libcxx/include_as_c.sh.cpp
+++ b/test/libcxx/include_as_c.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,6 +17,7 @@
 #include <complex.h>
 #include <ctype.h>
 #include <errno.h>
+#include <fenv.h>
 #include <float.h>
 #include <inttypes.h>
 #include <limits.h>
@@ -34,4 +34,8 @@
 #include <wchar.h>
 #include <wctype.h>
 
-int main() {}
+int main(int argc, char **argv) {
+  (void)argc;
+  (void)argv;
+  return 0;
+}
diff --git a/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/fopen.fail.cpp b/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/fopen.fail.cpp
index 31a37229b..1c2c329c2 100644
--- a/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/fopen.fail.cpp
+++ b/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/fopen.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 
 #include <cstdio>
 
-int main() {
+int main(int, char**) {
     // fopen is not available on systems without a global filesystem namespace.
     std::fopen("", "");
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/rename.fail.cpp b/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/rename.fail.cpp
index 248ab4d67..61ef15d17 100644
--- a/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/rename.fail.cpp
+++ b/test/libcxx/input.output/file.streams/c.files/no.global.filesystem.namespace/rename.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 
 #include <cstdio>
 
-int main() {
+int main(int, char**) {
     // rename is not available on systems without a global filesystem namespace.
     std::rename("", "");
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/c.files/version_ccstdio.pass.cpp b/test/libcxx/input.output/file.streams/c.files/version_ccstdio.pass.cpp
index 0d7fc5605..d8ff6a7ac 100644
--- a/test/libcxx/input.output/file.streams/c.files/version_ccstdio.pass.cpp
+++ b/test/libcxx/input.output/file.streams/c.files/version_ccstdio.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/c.files/version_cinttypes.pass.cpp b/test/libcxx/input.output/file.streams/c.files/version_cinttypes.pass.cpp
index bfd379e43..23cecf9cb 100644
--- a/test/libcxx/input.output/file.streams/c.files/version_cinttypes.pass.cpp
+++ b/test/libcxx/input.output/file.streams/c.files/version_cinttypes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/fstreams/filebuf/traits_mismatch.fail.cpp b/test/libcxx/input.output/file.streams/fstreams/filebuf/traits_mismatch.fail.cpp
index 84045cf3c..91b678d1d 100644
--- a/test/libcxx/input.output/file.streams/fstreams/filebuf/traits_mismatch.fail.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/filebuf/traits_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 
 #include <fstream>
 
-int main()
+int main(int, char**)
 {
 	std::basic_filebuf<char, std::char_traits<wchar_t> > f;
 //  expected-error-re@streambuf:* {{static_assert failed{{.*}} "traits_type::char_type must be the same type as CharT"}}
+
+  return 0;
 }
 
diff --git a/test/libcxx/input.output/file.streams/fstreams/fstream.close.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/fstream.close.pass.cpp
new file mode 100644
index 000000000..6af876981
--- /dev/null
+++ b/test/libcxx/input.output/file.streams/fstreams/fstream.close.pass.cpp
@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// <fstream>
+
+// template <class charT, class traits = char_traits<charT> >
+// class basic_fstream
+
+// close();
+
+//	Inspired by PR#38052 - std::fstream still good after closing and updating content
+
+#include <fstream>
+#include <cassert>
+#include "platform_support.h"
+
+int main(int, char**)
+{
+    std::string temp = get_temp_file_name();
+
+    std::fstream ofs(temp, std::ios::out | std::ios::trunc);
+    ofs << "Hello, World!\n";
+    assert( ofs.good());
+    ofs.close();
+    assert( ofs.good());
+    ofs << "Hello, World!\n";
+    assert(!ofs.good());
+
+    std::remove(temp.c_str());
+
+  return 0;
+}
diff --git a/test/libcxx/input.output/file.streams/fstreams/fstream.cons/wchar_pointer.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/fstream.cons/wchar_pointer.pass.cpp
index 9808d1c09..19442da51 100644
--- a/test/libcxx/input.output/file.streams/fstreams/fstream.cons/wchar_pointer.pass.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/fstream.cons/wchar_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
     std::wstring temp = get_wide_temp_file_name();
@@ -43,4 +42,6 @@ int main()
     }
     _wremove(temp.c_str());
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/fstreams/fstream.members/open_wchar_pointer.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/fstream.members/open_wchar_pointer.pass.cpp
index 131b58763..0dead68c9 100644
--- a/test/libcxx/input.output/file.streams/fstreams/fstream.members/open_wchar_pointer.pass.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/fstream.members/open_wchar_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
     std::wstring temp = get_wide_temp_file_name();
@@ -49,4 +48,6 @@ int main()
     }
     _wremove(temp.c_str());
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/fstreams/ifstream.cons/wchar_pointer.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/ifstream.cons/wchar_pointer.pass.cpp
index 84a2bf992..178c7d69a 100644
--- a/test/libcxx/input.output/file.streams/fstreams/ifstream.cons/wchar_pointer.pass.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/ifstream.cons/wchar_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
     {
@@ -39,4 +38,6 @@ int main()
     // test/libcxx/input.output/file.streams/fstreams/ofstream.cons/wchar_pointer.pass.cpp
     // which creates writable files.
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/fstreams/ifstream.members/open_wchar_pointer.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/ifstream.members/open_wchar_pointer.pass.cpp
index 81351b557..2e8b3620e 100644
--- a/test/libcxx/input.output/file.streams/fstreams/ifstream.members/open_wchar_pointer.pass.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/ifstream.members/open_wchar_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
     {
@@ -45,4 +44,6 @@ int main()
         assert(c == L'r');
     }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/fstreams/ofstream.cons/wchar_pointer.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/ofstream.cons/wchar_pointer.pass.cpp
index 6741e75ce..7d6304cc9 100644
--- a/test/libcxx/input.output/file.streams/fstreams/ofstream.cons/wchar_pointer.pass.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/ofstream.cons/wchar_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
     std::wstring temp = get_wide_temp_file_name();
@@ -57,4 +56,6 @@ int main()
     }
     _wremove(temp.c_str());
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/fstreams/ofstream.members/open_wchar_pointer.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/ofstream.members/open_wchar_pointer.pass.cpp
index 8c2e62308..58f08b865 100644
--- a/test/libcxx/input.output/file.streams/fstreams/ofstream.members/open_wchar_pointer.pass.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/ofstream.members/open_wchar_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
     std::wstring temp = get_wide_temp_file_name();
@@ -57,4 +56,6 @@ int main()
     }
     _wremove(temp.c_str());
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/file.streams/fstreams/traits_mismatch.fail.cpp b/test/libcxx/input.output/file.streams/fstreams/traits_mismatch.fail.cpp
index c843b7e98..432cfccac 100644
--- a/test/libcxx/input.output/file.streams/fstreams/traits_mismatch.fail.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/traits_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include <fstream>
 
-int main()
+int main(int, char**)
 {
 	std::basic_fstream<char, std::char_traits<wchar_t> > f;
 //  expected-error-re@ios:* {{static_assert failed{{.*}} "traits_type::char_type must be the same type as CharT"}}
@@ -26,5 +25,7 @@ int main()
 // exception specifications for types which are already invalid for one reason or another.
 // For now we tolerate this diagnostic.
 // expected-error@ostream:* 0-1 {{exception specification of overriding function is more lax than base version}}
+
+  return 0;
 }
 
diff --git a/test/libcxx/input.output/file.streams/fstreams/version.pass.cpp b/test/libcxx/input.output/file.streams/fstreams/version.pass.cpp
index 44b851416..515324088 100644
--- a/test/libcxx/input.output/file.streams/fstreams/version.pass.cpp
+++ b/test/libcxx/input.output/file.streams/fstreams/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.sh.cpp b/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.sh.cpp
index 6372755fc..e24ae996e 100644
--- a/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.sh.cpp
+++ b/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/input.output/filesystems/class.path/path.itr/iterator_db.pass.cpp b/test/libcxx/input.output/filesystems/class.path/path.itr/iterator_db.pass.cpp
index 405f9abc2..396e4ff24 100644
--- a/test/libcxx/input.output/filesystems/class.path/path.itr/iterator_db.pass.cpp
+++ b/test/libcxx/input.output/filesystems/class.path/path.itr/iterator_db.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "test_macros.h"
 #include "filesystem_test_helper.hpp"
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   using ExType = std::__libcpp_debug_exception;
   // Test incrementing/decrementing a singular iterator
@@ -72,4 +71,6 @@ int main() {
       assert(false);
     } catch (ExType const&) {}
   }
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/filesystems/class.path/path.itr/reverse_iterator_produces_diagnostic.fail.cpp b/test/libcxx/input.output/filesystems/class.path/path.itr/reverse_iterator_produces_diagnostic.fail.cpp
index 992cdebb5..5eb5cbdb3 100644
--- a/test/libcxx/input.output/filesystems/class.path/path.itr/reverse_iterator_produces_diagnostic.fail.cpp
+++ b/test/libcxx/input.output/filesystems/class.path/path.itr/reverse_iterator_produces_diagnostic.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <iterator>
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   using RIt = std::reverse_iterator<path::iterator>;
 
@@ -26,4 +25,6 @@ int main() {
     RIt r;
     ((void)r);
   }
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/filesystems/class.path/path.req/is_pathable.pass.cpp b/test/libcxx/input.output/filesystems/class.path/path.req/is_pathable.pass.cpp
index ff0cc5935..a80f02e4c 100644
--- a/test/libcxx/input.output/filesystems/class.path/path.req/is_pathable.pass.cpp
+++ b/test/libcxx/input.output/filesystems/class.path/path.req/is_pathable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -96,9 +95,11 @@ struct MakeTestType {
   }
 };
 
-int main() {
+int main(int, char**) {
   MakeTestType<char>::Test();
   MakeTestType<wchar_t>::Test();
   MakeTestType<char16_t>::Test();
   MakeTestType<char32_t>::Test();
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/filesystems/convert_file_time.sh.cpp b/test/libcxx/input.output/filesystems/convert_file_time.sh.cpp
index 21a1a4992..55cd659cc 100644
--- a/test/libcxx/input.output/filesystems/convert_file_time.sh.cpp
+++ b/test/libcxx/input.output/filesystems/convert_file_time.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -278,7 +277,7 @@ struct TestClock {
 template <class IntType, class Period = std::micro>
 using TestFileTimeT = time_point<TestClock<duration<IntType, Period> > >;
 
-int main() {
+int main(int, char**) {
   { assert((test_case<file_time_type, time_t, struct timespec>::test())); }
   {
     assert((test_case<TestFileTimeT<int64_t>, int64_t,
@@ -304,4 +303,6 @@ int main() {
                       TestTimeSpec<int32_t, int32_t> >::test()));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/filesystems/version.pass.cpp b/test/libcxx/input.output/filesystems/version.pass.cpp
index f680217ef..b0f031744 100644
--- a/test/libcxx/input.output/filesystems/version.pass.cpp
+++ b/test/libcxx/input.output/filesystems/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/iostream.format/input.streams/traits_mismatch.fail.cpp b/test/libcxx/input.output/iostream.format/input.streams/traits_mismatch.fail.cpp
index a459ec4fb..32088497a 100644
--- a/test/libcxx/input.output/iostream.format/input.streams/traits_mismatch.fail.cpp
+++ b/test/libcxx/input.output/iostream.format/input.streams/traits_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@ struct test_istream
     : public std::basic_istream<char, std::char_traits<wchar_t> > {};
 
 
-int main()
+int main(int, char**)
 {
 //  expected-error-re@ios:* {{static_assert failed{{.*}} "traits_type::char_type must be the same type as CharT"}}
+
+  return 0;
 }
 
diff --git a/test/libcxx/input.output/iostream.format/input.streams/version.pass.cpp b/test/libcxx/input.output/iostream.format/input.streams/version.pass.cpp
index b03ef2aaa..77ed7563b 100644
--- a/test/libcxx/input.output/iostream.format/input.streams/version.pass.cpp
+++ b/test/libcxx/input.output/iostream.format/input.streams/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/iostream.format/output.streams/traits_mismatch.fail.cpp b/test/libcxx/input.output/iostream.format/output.streams/traits_mismatch.fail.cpp
index fab0dd436..897509745 100644
--- a/test/libcxx/input.output/iostream.format/output.streams/traits_mismatch.fail.cpp
+++ b/test/libcxx/input.output/iostream.format/output.streams/traits_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@ struct test_ostream
     : public std::basic_ostream<char, std::char_traits<wchar_t> > {};
 
 
-int main()
+int main(int, char**)
 {
 //  expected-error-re@ios:* {{static_assert failed{{.*}} "traits_type::char_type must be the same type as CharT"}}
+
+  return 0;
 }
 
diff --git a/test/libcxx/input.output/iostream.format/output.streams/version.pass.cpp b/test/libcxx/input.output/iostream.format/output.streams/version.pass.cpp
index 662b6987b..f16e9a079 100644
--- a/test/libcxx/input.output/iostream.format/output.streams/version.pass.cpp
+++ b/test/libcxx/input.output/iostream.format/output.streams/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/iostream.format/std.manip/version.pass.cpp b/test/libcxx/input.output/iostream.format/std.manip/version.pass.cpp
index ca4fd3d46..498410ed1 100644
--- a/test/libcxx/input.output/iostream.format/std.manip/version.pass.cpp
+++ b/test/libcxx/input.output/iostream.format/std.manip/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/iostream.forward/version.pass.cpp b/test/libcxx/input.output/iostream.forward/version.pass.cpp
index cf91332d5..70f1ec662 100644
--- a/test/libcxx/input.output/iostream.forward/version.pass.cpp
+++ b/test/libcxx/input.output/iostream.forward/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/iostream.objects/version.pass.cpp b/test/libcxx/input.output/iostream.objects/version.pass.cpp
index 09b3611f6..7081e5abf 100644
--- a/test/libcxx/input.output/iostream.objects/version.pass.cpp
+++ b/test/libcxx/input.output/iostream.objects/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/iostreams.base/ios/iostate.flags/clear.abort.pass.cpp b/test/libcxx/input.output/iostreams.base/ios/iostate.flags/clear.abort.pass.cpp
new file mode 100644
index 000000000..e6dc1c981
--- /dev/null
+++ b/test/libcxx/input.output/iostreams.base/ios/iostate.flags/clear.abort.pass.cpp
@@ -0,0 +1,41 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <ios>
+
+// template <class charT, class traits> class basic_ios
+
+// void clear(iostate state);
+
+// Make sure that we abort() when exceptions are disabled and the exception
+// flag is set for the iostate we pass to clear().
+
+// REQUIRES: libcpp-no-exceptions
+
+#include <csignal>
+#include <cstdlib>
+#include <ios>
+#include <streambuf>
+
+
+void exit_success(int) {
+    std::_Exit(EXIT_SUCCESS);
+}
+
+struct testbuf : public std::streambuf {};
+
+int main(int, char**) {
+    std::signal(SIGABRT, exit_success);
+
+    testbuf buf;
+    std::ios ios(&buf);
+    ios.exceptions(std::ios::badbit);
+    ios.clear(std::ios::badbit);
+
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/input.output/iostreams.base/version.pass.cpp b/test/libcxx/input.output/iostreams.base/version.pass.cpp
index f56846d38..4b873a926 100644
--- a/test/libcxx/input.output/iostreams.base/version.pass.cpp
+++ b/test/libcxx/input.output/iostreams.base/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/stream.buffers/version.pass.cpp b/test/libcxx/input.output/stream.buffers/version.pass.cpp
index c4b06be60..cc55444b5 100644
--- a/test/libcxx/input.output/stream.buffers/version.pass.cpp
+++ b/test/libcxx/input.output/stream.buffers/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/input.output/string.streams/traits_mismatch.fail.cpp b/test/libcxx/input.output/string.streams/traits_mismatch.fail.cpp
index f048cae0c..a046b34ab 100644
--- a/test/libcxx/input.output/string.streams/traits_mismatch.fail.cpp
+++ b/test/libcxx/input.output/string.streams/traits_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 
 #include <sstream>
 
-int main()
+int main(int, char**)
 {
 	std::basic_stringbuf<char, std::char_traits<wchar_t> > sb;
 //  expected-error-re@streambuf:* {{static_assert failed{{.*}} "traits_type::char_type must be the same type as CharT"}}
 //  expected-error-re@string:* {{static_assert failed{{.*}} "traits_type::char_type must be the same type as CharT"}}
+
+  return 0;
 }
 
diff --git a/test/libcxx/input.output/string.streams/version.pass.cpp b/test/libcxx/input.output/string.streams/version.pass.cpp
index 103897106..03beac77b 100644
--- a/test/libcxx/input.output/string.streams/version.pass.cpp
+++ b/test/libcxx/input.output/string.streams/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/iterators/failed.pass.cpp b/test/libcxx/iterators/failed.pass.cpp
index 2e4717b38..e44c15eba 100644
--- a/test/libcxx/iterators/failed.pass.cpp
+++ b/test/libcxx/iterators/failed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostreambuf_iterator<char> i(nullptr);
@@ -29,4 +28,6 @@ int main()
         std::ostreambuf_iterator<wchar_t> i(nullptr);
         assert(i.failed());
     }
+
+  return 0;
 }
diff --git a/test/libcxx/iterators/trivial_iterators.pass.cpp b/test/libcxx/iterators/trivial_iterators.pass.cpp
index f30c13163..0618731ce 100644
--- a/test/libcxx/iterators/trivial_iterators.pass.cpp
+++ b/test/libcxx/iterators/trivial_iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -91,7 +90,7 @@ operator!=(const my_input_iterator<T>& x, const my_input_iterator<U>& y)
 }
 
 
-int main()
+int main(int, char**)
 {
 //  basic tests
     static_assert(( std::__libcpp_is_trivial_iterator<char *>::value), "");
@@ -185,4 +184,6 @@ int main()
     static_assert(( std::__libcpp_is_trivial_iterator<std::initializer_list<char>::const_iterator>        ::value), "");
 #endif
 
+
+  return 0;
 }
diff --git a/test/libcxx/iterators/version.pass.cpp b/test/libcxx/iterators/version.pass.cpp
index dd0978503..16668898a 100644
--- a/test/libcxx/iterators/version.pass.cpp
+++ b/test/libcxx/iterators/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/cmp/version.pass.cpp b/test/libcxx/language.support/cmp/version.pass.cpp
index 570a7a6ad..9d2ae8ac1 100644
--- a/test/libcxx/language.support/cmp/version.pass.cpp
+++ b/test/libcxx/language.support/cmp/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/cstdint/version.pass.cpp b/test/libcxx/language.support/cstdint/version.pass.cpp
index 4c9a43a62..9f11f15d1 100644
--- a/test/libcxx/language.support/cstdint/version.pass.cpp
+++ b/test/libcxx/language.support/cstdint/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp b/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp
index 7e3130cf9..b5171a39e 100644
--- a/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp
+++ b/test/libcxx/language.support/cxa_deleted_virtual.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,9 @@
 // XFAIL: with_system_cxx_lib=macosx10.7
 
 struct S { virtual void f() = delete; virtual ~S() {} };
-int main() {
+int main(int, char**) {
   S *s = new S;
   delete s;
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/has_c11_features.pass.cpp b/test/libcxx/language.support/has_c11_features.pass.cpp
index 4edec534e..7abdbc1c8 100644
--- a/test/libcxx/language.support/has_c11_features.pass.cpp
+++ b/test/libcxx/language.support/has_c11_features.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14
@@ -29,4 +28,6 @@
 # endif
 #endif
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp b/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
index 0e28d61ef..04ba34ca0 100644
--- a/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
+++ b/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,6 @@
 // definitions, which does not yet provide aligned allocation
 // XFAIL: LIBCXX-WINDOWS-FIXME
 
-// Clang 10 (and older) will trigger an availability error when the deployment
-// target does not support aligned allocation, even if we pass `-faligned-allocation`.
-// XFAIL: apple-clang-10 && availability=macosx10.12
-
 // The dylibs shipped before macosx10.14 do not contain the aligned allocation
 // functions, so trying to force using those with -faligned-allocation results
 // in a link error.
@@ -258,7 +253,9 @@ void test_allocator_and_new_match() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_libcpp_dealloc();
   test_allocator_and_new_match();
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.dynamic/new_faligned_allocation.sh.cpp b/test/libcxx/language.support/support.dynamic/new_faligned_allocation.sh.cpp
index d7b4cca63..f3db56478 100644
--- a/test/libcxx/language.support/support.dynamic/new_faligned_allocation.sh.cpp
+++ b/test/libcxx/language.support/support.dynamic/new_faligned_allocation.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   {
     static_assert(std::is_enum<std::align_val_t>::value, "");
     typedef std::underlying_type<std::align_val_t>::type UT;
@@ -89,4 +88,6 @@ int main() {
     assert(typeid(std::align_val_t).name() == std::string("St11align_val_t"));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.dynamic/version.pass.cpp b/test/libcxx/language.support/support.dynamic/version.pass.cpp
index ba1ff518e..c3f542ca8 100644
--- a/test/libcxx/language.support/support.dynamic/version.pass.cpp
+++ b/test/libcxx/language.support/support.dynamic/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.exception/version.pass.cpp b/test/libcxx/language.support/support.exception/version.pass.cpp
index acdedbb31..495a8cde9 100644
--- a/test/libcxx/language.support/support.exception/version.pass.cpp
+++ b/test/libcxx/language.support/support.exception/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.initlist/version.pass.cpp b/test/libcxx/language.support/support.initlist/version.pass.cpp
index f3f08cd1f..6f42987b1 100644
--- a/test/libcxx/language.support/support.initlist/version.pass.cpp
+++ b/test/libcxx/language.support/support.initlist/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.limits/c.limits/version_cfloat.pass.cpp b/test/libcxx/language.support/support.limits/c.limits/version_cfloat.pass.cpp
index 19b463199..baa925f7d 100644
--- a/test/libcxx/language.support/support.limits/c.limits/version_cfloat.pass.cpp
+++ b/test/libcxx/language.support/support.limits/c.limits/version_cfloat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.limits/c.limits/version_climits.pass.cpp b/test/libcxx/language.support/support.limits/c.limits/version_climits.pass.cpp
index 3fe07a517..208b16ed7 100644
--- a/test/libcxx/language.support/support.limits/c.limits/version_climits.pass.cpp
+++ b/test/libcxx/language.support/support.limits/c.limits/version_climits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.limits/limits/version.pass.cpp b/test/libcxx/language.support/support.limits/limits/version.pass.cpp
index 0cb3f6f52..a17643bc4 100644
--- a/test/libcxx/language.support/support.limits/limits/version.pass.cpp
+++ b/test/libcxx/language.support/support.limits/limits/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.limits/version.pass.cpp b/test/libcxx/language.support/support.limits/version.pass.cpp
index c79a69085..4277147f6 100644
--- a/test/libcxx/language.support/support.limits/version.pass.cpp
+++ b/test/libcxx/language.support/support.limits/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error "_LIBCPP_VERSION must be defined after including <version>"
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.rtti/version.pass.cpp b/test/libcxx/language.support/support.rtti/version.pass.cpp
index 0a9ece34f..3d21c8487 100644
--- a/test/libcxx/language.support/support.rtti/version.pass.cpp
+++ b/test/libcxx/language.support/support.rtti/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.runtime/version_csetjmp.pass.cpp b/test/libcxx/language.support/support.runtime/version_csetjmp.pass.cpp
index 7e37716d0..9bceaf823 100644
--- a/test/libcxx/language.support/support.runtime/version_csetjmp.pass.cpp
+++ b/test/libcxx/language.support/support.runtime/version_csetjmp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.runtime/version_csignal.pass.cpp b/test/libcxx/language.support/support.runtime/version_csignal.pass.cpp
index be1045f1e..b93fb0d17 100644
--- a/test/libcxx/language.support/support.runtime/version_csignal.pass.cpp
+++ b/test/libcxx/language.support/support.runtime/version_csignal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.runtime/version_cstdarg.pass.cpp b/test/libcxx/language.support/support.runtime/version_cstdarg.pass.cpp
index f3ca9389b..0ddd98b52 100644
--- a/test/libcxx/language.support/support.runtime/version_cstdarg.pass.cpp
+++ b/test/libcxx/language.support/support.runtime/version_cstdarg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.runtime/version_cstdbool.pass.cpp b/test/libcxx/language.support/support.runtime/version_cstdbool.pass.cpp
index 0415227e5..85f1fb34d 100644
--- a/test/libcxx/language.support/support.runtime/version_cstdbool.pass.cpp
+++ b/test/libcxx/language.support/support.runtime/version_cstdbool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.runtime/version_cstdlib.pass.cpp b/test/libcxx/language.support/support.runtime/version_cstdlib.pass.cpp
index db419524f..9a5a02fb8 100644
--- a/test/libcxx/language.support/support.runtime/version_cstdlib.pass.cpp
+++ b/test/libcxx/language.support/support.runtime/version_cstdlib.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.runtime/version_ctime.pass.cpp b/test/libcxx/language.support/support.runtime/version_ctime.pass.cpp
index ce0bf2cf1..bc2d039b3 100644
--- a/test/libcxx/language.support/support.runtime/version_ctime.pass.cpp
+++ b/test/libcxx/language.support/support.runtime/version_ctime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/language.support/support.types/version.pass.cpp b/test/libcxx/language.support/support.types/version.pass.cpp
index 2ab7c188d..5dd755c00 100644
--- a/test/libcxx/language.support/support.types/version.pass.cpp
+++ b/test/libcxx/language.support/support.types/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/libcpp_alignof.pass.cpp b/test/libcxx/libcpp_alignof.pass.cpp
new file mode 100644
index 000000000..0f6721084
--- /dev/null
+++ b/test/libcxx/libcpp_alignof.pass.cpp
@@ -0,0 +1,37 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Test that _LIBCPP_ALIGNOF acts the same as the C++11 keyword `alignof`, and
+// not as the GNU extension `__alignof`. The former returns the minimal required
+// alignment for a type, whereas the latter returns the preferred alignment.
+//
+// See llvm.org/PR39713
+
+#include <type_traits>
+#include "test_macros.h"
+
+template <class T>
+void test() {
+  static_assert(_LIBCPP_ALIGNOF(T) == std::alignment_of<T>::value, "");
+  static_assert(_LIBCPP_ALIGNOF(T) == TEST_ALIGNOF(T), "");
+#if TEST_STD_VER >= 11
+  static_assert(_LIBCPP_ALIGNOF(T) == alignof(T), "");
+#endif
+#ifdef TEST_COMPILER_CLANG
+  static_assert(_LIBCPP_ALIGNOF(T) == _Alignof(T), "");
+#endif
+}
+
+int main(int, char**) {
+  test<int>();
+  test<long long>();
+  test<double>();
+  test<long double>();
+  return 0;
+}
diff --git a/test/libcxx/libcpp_version.pass.cpp b/test/libcxx/libcpp_version.pass.cpp
index b83233837..a2d18c3bb 100644
--- a/test/libcxx/libcpp_version.pass.cpp
+++ b/test/libcxx/libcpp_version.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,6 +22,8 @@ static const int libcpp_version =
 static_assert(_LIBCPP_VERSION == libcpp_version,
               "_LIBCPP_VERSION doesn't match __libcpp_version");
 
-int main() {
+int main(int, char**) {
+
 
+  return 0;
 }
diff --git a/test/libcxx/localization/c.locales/version.pass.cpp b/test/libcxx/localization/c.locales/version.pass.cpp
index 0fce59e2b..2dfc76dd9 100644
--- a/test/libcxx/localization/c.locales/version.pass.cpp
+++ b/test/libcxx/localization/c.locales/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/localization/locale.categories/__scan_keyword.pass.cpp b/test/libcxx/localization/locale.categories/__scan_keyword.pass.cpp
index b33aab9a7..b85bd8a58 100644
--- a/test/libcxx/localization/locale.categories/__scan_keyword.pass.cpp
+++ b/test/libcxx/localization/locale.categories/__scan_keyword.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::ctype<char>& ct = std::use_facet<std::ctype<char> >(std::locale::classic());
     std::ios_base::iostate err = std::ios_base::goodbit;
@@ -115,4 +114,6 @@ int main()
         assert(in == input+3);
         assert(err == std::ios_base::goodbit);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/localization/locale.stdcvt/version.pass.cpp b/test/libcxx/localization/locale.stdcvt/version.pass.cpp
index 388538085..738ab5e41 100644
--- a/test/libcxx/localization/locale.stdcvt/version.pass.cpp
+++ b/test/libcxx/localization/locale.stdcvt/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/localization/locales/locale.abort.pass.cpp b/test/libcxx/localization/locales/locale.abort.pass.cpp
new file mode 100644
index 000000000..5817ebdfd
--- /dev/null
+++ b/test/libcxx/localization/locales/locale.abort.pass.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <locale>
+
+// class locale;
+
+// explicit locale( const char* std_name );
+
+// REQUIRES: libcpp-no-exceptions
+
+// Make sure we abort() when we construct a locale with a null name and
+// exceptions are disabled.
+
+#include <csignal>
+#include <cstdlib>
+#include <locale>
+
+
+void exit_success(int) {
+    std::_Exit(EXIT_SUCCESS);
+}
+
+int main(int, char**) {
+    std::signal(SIGABRT, exit_success);
+    std::locale loc(NULL);
+    (void)loc;
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/localization/locales/locale.category.abort.pass.cpp b/test/libcxx/localization/locales/locale.category.abort.pass.cpp
new file mode 100644
index 000000000..cf50415a2
--- /dev/null
+++ b/test/libcxx/localization/locales/locale.category.abort.pass.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <locale>
+
+// class locale;
+
+// locale(const locale& other, const char* std_name, category cat);
+
+// REQUIRES: libcpp-no-exceptions
+
+// Make sure we abort() when we construct a locale with a null name and
+// exceptions are disabled.
+
+#include <csignal>
+#include <cstdlib>
+#include <locale>
+
+
+void exit_success(int) {
+    std::_Exit(EXIT_SUCCESS);
+}
+
+int main(int, char**) {
+    std::signal(SIGABRT, exit_success);
+    std::locale loc(std::locale(), NULL, std::locale::ctype);
+    (void)loc;
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp b/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp
index 18cc0ca97..3aac6f532 100644
--- a/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp
+++ b/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt_utf8<wchar_t> Codecvt;
     typedef std::wstring_convert<Codecvt> Myconv;
@@ -35,4 +34,6 @@ int main()
     // move construct a new converter and make sure the state is the same.
     Myconv myconv2(std::move(myconv));
     assert(myconv2.converted() == old_converted);
+
+  return 0;
 }
diff --git a/test/libcxx/localization/locales/locale/locale.types/locale.facet/facet.pass.cpp b/test/libcxx/localization/locales/locale/locale.types/locale.facet/facet.pass.cpp
index 4a7f77ad5..7be14d6be 100644
--- a/test/libcxx/localization/locales/locale/locale.types/locale.facet/facet.pass.cpp
+++ b/test/libcxx/localization/locales/locale/locale.types/locale.facet/facet.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ struct my_facet
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     my_facet* f = new my_facet;
     f->__add_shared();
@@ -50,4 +49,6 @@ int main()
     assert(my_facet::count == 1);
     f->__release_shared();
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/libcxx/localization/locales/locale/locale.types/locale.id/id.pass.cpp b/test/libcxx/localization/locales/locale/locale.types/locale.id/id.pass.cpp
index 3233624d8..758d7f8b8 100644
--- a/test/libcxx/localization/locales/locale/locale.types/locale.id/id.pass.cpp
+++ b/test/libcxx/localization/locales/locale/locale.types/locale.id/id.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ std::locale::id id0;
 std::locale::id id2;
 std::locale::id id1;
 
-int main()
+int main(int, char**)
 {
     long id = id0.__get();
     assert(id0.__get() == id+0);
@@ -47,4 +46,6 @@ int main()
     assert(id2.__get() == id+2);
     assert(id2.__get() == id+2);
     assert(id2.__get() == id+2);
+
+  return 0;
 }
diff --git a/test/libcxx/localization/locales/use_facet.abort.pass.cpp b/test/libcxx/localization/locales/use_facet.abort.pass.cpp
new file mode 100644
index 000000000..64700eab9
--- /dev/null
+++ b/test/libcxx/localization/locales/use_facet.abort.pass.cpp
@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <locale>
+
+// template <class Facet> const Facet& use_facet(const locale& loc);
+
+// REQUIRES: libcpp-no-exceptions
+
+// Make sure we abort() when we pass a facet not associated to the locale to
+// use_facet() and exceptions are disabled.
+
+#include <csignal>
+#include <cstdlib>
+#include <locale>
+
+
+struct my_facet : public std::locale::facet {
+    static std::locale::id id;
+};
+
+std::locale::id my_facet::id;
+
+void exit_success(int) {
+    std::_Exit(EXIT_SUCCESS);
+}
+
+int main(int, char**) {
+    std::signal(SIGABRT, exit_success);
+    std::use_facet<my_facet>(std::locale());
+    return EXIT_FAILURE;
+}
diff --git a/test/libcxx/localization/version.pass.cpp b/test/libcxx/localization/version.pass.cpp
index a64534c9f..1d1294593 100644
--- a/test/libcxx/localization/version.pass.cpp
+++ b/test/libcxx/localization/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/memory/aligned_allocation_macro.pass.cpp b/test/libcxx/memory/aligned_allocation_macro.pass.cpp
index 5390bef3e..7099eed2e 100644
--- a/test/libcxx/memory/aligned_allocation_macro.pass.cpp
+++ b/test/libcxx/memory/aligned_allocation_macro.pass.cpp
@@ -1,22 +1,24 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// Aligned allocation functions are not provided prior to macosx10.13, but
-// AppleClang <= 10 does not know about this restriction and always enables them.
-// XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
-// XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
-// XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
-// XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.9
-// XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.8
-// XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.7
+// AppleClang <= 10 enables aligned allocation regardless of the deployment
+// target, so this test would fail.
+// UNSUPPORTED: apple-clang-9, apple-clang-10
+
+// XFAIL: availability=macosx10.13
+// XFAIL: availability=macosx10.12
+// XFAIL: availability=macosx10.11
+// XFAIL: availability=macosx10.10
+// XFAIL: availability=macosx10.9
+// XFAIL: availability=macosx10.8
+// XFAIL: availability=macosx10.7
 
 #include <new>
 
@@ -25,4 +27,6 @@
 #   error "libc++ should have aligned allocation in C++17 and up when targeting a platform that supports it"
 #endif
 
-int main() { }
+int main(int, char**) { 
+  return 0;
+}
diff --git a/test/libcxx/memory/is_allocator.pass.cpp b/test/libcxx/memory/is_allocator.pass.cpp
index 95f1079d6..d62a91f7d 100644
--- a/test/libcxx/memory/is_allocator.pass.cpp
+++ b/test/libcxx/memory/is_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -33,10 +32,12 @@ void test_allocators()
 }
 
 
-int main()
+int main(int, char**)
 {
 //	test_allocators<void>();
 	test_allocators<char>();
 	test_allocators<int>();
 	test_allocators<std::string>();
+
+  return 0;
 }
diff --git a/test/libcxx/min_max_macros.sh.cpp b/test/libcxx/min_max_macros.sh.cpp
index 7b9202d95..8351e5789 100644
--- a/test/libcxx/min_max_macros.sh.cpp
+++ b/test/libcxx/min_max_macros.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/modules/cinttypes_exports.sh.cpp b/test/libcxx/modules/cinttypes_exports.sh.cpp
index ce39ceea4..a24aafdcc 100644
--- a/test/libcxx/modules/cinttypes_exports.sh.cpp
+++ b/test/libcxx/modules/cinttypes_exports.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include <cinttypes>
 
-int main() {
+int main(int, char**) {
   int8_t x; ((void)x);
   std::int8_t y; ((void)y);
+
+  return 0;
 }
diff --git a/test/libcxx/modules/clocale_exports.sh.cpp b/test/libcxx/modules/clocale_exports.sh.cpp
index aacddd2d8..3225155ca 100644
--- a/test/libcxx/modules/clocale_exports.sh.cpp
+++ b/test/libcxx/modules/clocale_exports.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,9 +19,11 @@
 
 #define TEST(...) do { using T = decltype( __VA_ARGS__ ); } while(false)
 
-int main() {
+int main(int, char**) {
   std::lconv l; ((void)l);
 
   TEST(std::setlocale(0, ""));
   TEST(std::localeconv());
+
+  return 0;
 }
diff --git a/test/libcxx/modules/cstdint_exports.sh.cpp b/test/libcxx/modules/cstdint_exports.sh.cpp
index 3d3cbe338..315d9ac17 100644
--- a/test/libcxx/modules/cstdint_exports.sh.cpp
+++ b/test/libcxx/modules/cstdint_exports.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include <cstdint>
 
-int main() {
+int main(int, char**) {
   int8_t x; ((void)x);
   std::int8_t y; ((void)y);
+
+  return 0;
 }
diff --git a/test/libcxx/modules/inttypes_h_exports.sh.cpp b/test/libcxx/modules/inttypes_h_exports.sh.cpp
index 5354c8fef..4cbb1d574 100644
--- a/test/libcxx/modules/inttypes_h_exports.sh.cpp
+++ b/test/libcxx/modules/inttypes_h_exports.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,6 +18,8 @@
 
 #include <inttypes.h>
 
-int main() {
+int main(int, char**) {
   int8_t x; ((void)x);
+
+  return 0;
 }
diff --git a/test/libcxx/modules/stdint_h_exports.sh.cpp b/test/libcxx/modules/stdint_h_exports.sh.cpp
index 78e110138..5b35ba30c 100644
--- a/test/libcxx/modules/stdint_h_exports.sh.cpp
+++ b/test/libcxx/modules/stdint_h_exports.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 
 #include <stdint.h>
 
-int main() {
+int main(int, char**) {
   int8_t x; ((void)x);
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp b/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp
index a58c389cd..330b3a134 100644
--- a/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp
+++ b/test/libcxx/numerics/c.math/constexpr-fns.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@ static_assert(std::__libcpp_isnan_or_builtin(0.) == false, "");
 static_assert(std::__libcpp_isinf_or_builtin(0.0) == false, "");
 static_assert(std::__libcpp_isfinite_or_builtin(0.0) == true, "");
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/c.math/ctgmath.pass.cpp b/test/libcxx/numerics/c.math/ctgmath.pass.cpp
index 815502f1c..81eac056b 100644
--- a/test/libcxx/numerics/c.math/ctgmath.pass.cpp
+++ b/test/libcxx/numerics/c.math/ctgmath.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,10 +14,12 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::complex<double> cd;
     ((void)cd);
     double x = std::sin(0);
     ((void)x);
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/c.math/fdelayed-template-parsing.sh.cpp b/test/libcxx/numerics/c.math/fdelayed-template-parsing.sh.cpp
index 37aaa2acf..37d09a879 100644
--- a/test/libcxx/numerics/c.math/fdelayed-template-parsing.sh.cpp
+++ b/test/libcxx/numerics/c.math/fdelayed-template-parsing.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,10 +18,12 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   assert(std::isfinite(1.0));
   assert(!std::isinf(1.0));
   assert(!std::isnan(1.0));
+
+  return 0;
 }
 
 using namespace std;
diff --git a/test/libcxx/numerics/c.math/tgmath_h.pass.cpp b/test/libcxx/numerics/c.math/tgmath_h.pass.cpp
index 23143c714..d3cd15ca0 100644
--- a/test/libcxx/numerics/c.math/tgmath_h.pass.cpp
+++ b/test/libcxx/numerics/c.math/tgmath_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/c.math/version_cmath.pass.cpp b/test/libcxx/numerics/c.math/version_cmath.pass.cpp
index 1249a902e..1b4ab9a6d 100644
--- a/test/libcxx/numerics/c.math/version_cmath.pass.cpp
+++ b/test/libcxx/numerics/c.math/version_cmath.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/cfenv/version.pass.cpp b/test/libcxx/numerics/cfenv/version.pass.cpp
index 727d5bdf3..9ce5b9c4c 100644
--- a/test/libcxx/numerics/cfenv/version.pass.cpp
+++ b/test/libcxx/numerics/cfenv/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,6 +16,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/complex.number/__sqr.pass.cpp b/test/libcxx/numerics/complex.number/__sqr.pass.cpp
index a3cc9dd38..3a6aec0ac 100644
--- a/test/libcxx/numerics/complex.number/__sqr.pass.cpp
+++ b/test/libcxx/numerics/complex.number/__sqr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,9 +72,11 @@ test()
     assert(inf2.real() < 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/complex.number/ccmplx/ccomplex.pass.cpp b/test/libcxx/numerics/complex.number/ccmplx/ccomplex.pass.cpp
index cc98517b9..ff03bd09f 100644
--- a/test/libcxx/numerics/complex.number/ccmplx/ccomplex.pass.cpp
+++ b/test/libcxx/numerics/complex.number/ccmplx/ccomplex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::complex<double> d;
     (void)d;
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/complex.number/version.pass.cpp b/test/libcxx/numerics/complex.number/version.pass.cpp
index 316cfec73..ec3996e54 100644
--- a/test/libcxx/numerics/complex.number/version.pass.cpp
+++ b/test/libcxx/numerics/complex.number/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/numarray/version.pass.cpp b/test/libcxx/numerics/numarray/version.pass.cpp
index 85457d432..b921ae247 100644
--- a/test/libcxx/numerics/numarray/version.pass.cpp
+++ b/test/libcxx/numerics/numarray/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/numeric.ops/version.pass.cpp b/test/libcxx/numerics/numeric.ops/version.pass.cpp
index fb6e0a106..50a07a639 100644
--- a/test/libcxx/numerics/numeric.ops/version.pass.cpp
+++ b/test/libcxx/numerics/numeric.ops/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/numerics/rand/rand.synopsis/version.pass.cpp b/test/libcxx/numerics/rand/rand.synopsis/version.pass.cpp
index eae6c493e..b9f876d0f 100644
--- a/test/libcxx/numerics/rand/rand.synopsis/version.pass.cpp
+++ b/test/libcxx/numerics/rand/rand.synopsis/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/selftest/not_test.sh.cpp b/test/libcxx/selftest/not_test.sh.cpp
index 5b8348f0e..8dbf708f0 100644
--- a/test/libcxx/selftest/not_test.sh.cpp
+++ b/test/libcxx/selftest/not_test.sh.cpp
@@ -1,17 +1,16 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // RUN: %build
 // RUN: not %run
 
-int main()
+int main(int, char**)
 {
   return 1;
 }
diff --git a/test/libcxx/selftest/test.arc.fail.mm b/test/libcxx/selftest/test.arc.fail.mm
index a185eab13..712947bca 100644
--- a/test/libcxx/selftest/test.arc.fail.mm
+++ b/test/libcxx/selftest/test.arc.fail.mm
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/selftest/test.arc.pass.mm b/test/libcxx/selftest/test.arc.pass.mm
index ec272a872..eecdbb616 100644
--- a/test/libcxx/selftest/test.arc.pass.mm
+++ b/test/libcxx/selftest/test.arc.pass.mm
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,6 +11,4 @@
 #error "arc should be enabled"
 #endif
 
-int main()
-{
-}
+int main(int, char**) { return 0; }
diff --git a/test/libcxx/selftest/test.fail.cpp b/test/libcxx/selftest/test.fail.cpp
index 2ad608bab..7b091c51d 100644
--- a/test/libcxx/selftest/test.fail.cpp
+++ b/test/libcxx/selftest/test.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/selftest/test.fail.mm b/test/libcxx/selftest/test.fail.mm
index 764daf007..ea3a05421 100644
--- a/test/libcxx/selftest/test.fail.mm
+++ b/test/libcxx/selftest/test.fail.mm
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/selftest/test.pass.cpp b/test/libcxx/selftest/test.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/libcxx/selftest/test.pass.cpp
+++ b/test/libcxx/selftest/test.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/selftest/test.pass.mm b/test/libcxx/selftest/test.pass.mm
index b4289556e..ba4d36bbe 100644
--- a/test/libcxx/selftest/test.pass.mm
+++ b/test/libcxx/selftest/test.pass.mm
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,6 +11,4 @@
 #error "arc should *not* be enabled"
 #endif
 
-int main()
-{
-}
+int main(int, char**) { return 0; }
diff --git a/test/libcxx/selftest/test.sh.cpp b/test/libcxx/selftest/test.sh.cpp
index 14dc2db80..1fc175413 100644
--- a/test/libcxx/selftest/test.sh.cpp
+++ b/test/libcxx/selftest/test.sh.cpp
@@ -1,16 +1,17 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // RUN: %build
 // RUN: %run
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/selftest/test_macros.pass.cpp b/test/libcxx/selftest/test_macros.pass.cpp
index 8d68c2184..d7baeb2f9 100644
--- a/test/libcxx/selftest/test_macros.pass.cpp
+++ b/test/libcxx/selftest/test_macros.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -59,8 +58,10 @@ void test_libcxx_macros()
 //  ===== C++17 features =====
 }
 
-int main()
+int main(int, char**)
 {
     test_noexcept();
     test_libcxx_macros();
+
+  return 0;
 }
diff --git a/test/libcxx/strings/basic.string/string.modifiers/clear_and_shrink_db1.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/clear_and_shrink_db1.pass.cpp
index 920c0d185..b0de5d879 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/clear_and_shrink_db1.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/clear_and_shrink_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::string l = "Long string so that allocation definitely, for sure, absolutely happens. Probably.";
     std::string s = "short";
@@ -41,8 +40,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db1.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db1.pass.cpp
index 09a6aa8a6..a5258f95d 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db1.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string l1("123");
@@ -44,8 +43,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db2.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db2.pass.cpp
index 1ff02932b..099ce74f7 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db2.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string l1("123");
@@ -46,8 +45,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db1.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db1.pass.cpp
index 46fa5bf43..1802f6287 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db1.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string l1("123");
@@ -44,8 +43,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db2.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db2.pass.cpp
index 3ccbfad70..fe65851ef 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db2.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string l1("123");
@@ -44,8 +43,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db3.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db3.pass.cpp
index e493dfea9..fad146451 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db3.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string l1("123");
@@ -44,8 +43,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db4.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db4.pass.cpp
index 918cffe73..3186ad449 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db4.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/erase_iter_iter_db4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string l1("123");
@@ -42,8 +41,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/libcxx/strings/basic.string/string.modifiers/erase_pop_back_db1.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/erase_pop_back_db1.pass.cpp
index 8a6c3f0cf..2516a69f5 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/erase_pop_back_db1.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/erase_pop_back_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if _LIBCPP_DEBUG >= 1
     {
@@ -29,4 +28,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/strings/basic.string/string.modifiers/insert_iter_char_db1.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/insert_iter_char_db1.pass.cpp
index fbb26d178..7925e1597 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/insert_iter_char_db1.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/insert_iter_char_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 
 
-int main()
+int main(int, char**)
 {
 #if _LIBCPP_DEBUG >= 1
     {
@@ -31,4 +30,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/strings/basic.string/string.modifiers/insert_iter_size_char_db1.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/insert_iter_size_char_db1.pass.cpp
index 7ddd2b00d..81f888f86 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/insert_iter_size_char_db1.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/insert_iter_size_char_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if _LIBCPP_DEBUG >= 1
     {
@@ -28,4 +27,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp b/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp
index a3fa585e4..3fab03c01 100644
--- a/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp
+++ b/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,9 @@ void test_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_basic();
   test_buffer_usage();
+
+  return 0;
 }
diff --git a/test/libcxx/strings/c.strings/version_cctype.pass.cpp b/test/libcxx/strings/c.strings/version_cctype.pass.cpp
index e0919d9d2..47e857679 100644
--- a/test/libcxx/strings/c.strings/version_cctype.pass.cpp
+++ b/test/libcxx/strings/c.strings/version_cctype.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/strings/c.strings/version_cstring.pass.cpp b/test/libcxx/strings/c.strings/version_cstring.pass.cpp
index 87e705aec..21388b410 100644
--- a/test/libcxx/strings/c.strings/version_cstring.pass.cpp
+++ b/test/libcxx/strings/c.strings/version_cstring.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/strings/c.strings/version_cuchar.pass.cpp b/test/libcxx/strings/c.strings/version_cuchar.pass.cpp
index dcfdcc37a..8c6a9de70 100644
--- a/test/libcxx/strings/c.strings/version_cuchar.pass.cpp
+++ b/test/libcxx/strings/c.strings/version_cuchar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,6 +16,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/strings/c.strings/version_cwchar.pass.cpp b/test/libcxx/strings/c.strings/version_cwchar.pass.cpp
index 72e9855c5..f7539d4e8 100644
--- a/test/libcxx/strings/c.strings/version_cwchar.pass.cpp
+++ b/test/libcxx/strings/c.strings/version_cwchar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/strings/c.strings/version_cwctype.pass.cpp b/test/libcxx/strings/c.strings/version_cwctype.pass.cpp
index 461482abe..06aacb1fe 100644
--- a/test/libcxx/strings/c.strings/version_cwctype.pass.cpp
+++ b/test/libcxx/strings/c.strings/version_cwctype.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/strings/iterators.exceptions.pass.cpp b/test/libcxx/strings/iterators.exceptions.pass.cpp
index 7dea53c4c..471e6bea5 100644
--- a/test/libcxx/strings/iterators.exceptions.pass.cpp
+++ b/test/libcxx/strings/iterators.exceptions.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -34,7 +33,7 @@ static const bool expected = false;
 static const bool expected = true;
 #endif
 
-int main()
+int main(int, char**)
 {
 //  basic tests
     static_assert(( std::__libcpp_string_gets_noexcept_iterator<char *>::value), "");
@@ -85,4 +84,6 @@ int main()
     static_assert(( std::__libcpp_string_gets_noexcept_iterator<std::initializer_list<char>::iterator>              ::value), "");
     static_assert(( std::__libcpp_string_gets_noexcept_iterator<std::initializer_list<char>::const_iterator>        ::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/strings/iterators.noexcept.pass.cpp b/test/libcxx/strings/iterators.noexcept.pass.cpp
index c9d2bf5c2..b46bc639b 100644
--- a/test/libcxx/strings/iterators.noexcept.pass.cpp
+++ b/test/libcxx/strings/iterators.noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
 //  basic tests
     static_assert(( std::__libcpp_string_gets_noexcept_iterator<char *>::value), "");
@@ -78,4 +77,6 @@ int main()
     static_assert(( std::__libcpp_string_gets_noexcept_iterator<std::initializer_list<char>::iterator>              ::value), "");
     static_assert(( std::__libcpp_string_gets_noexcept_iterator<std::initializer_list<char>::const_iterator>        ::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/strings/version.pass.cpp b/test/libcxx/strings/version.pass.cpp
index 0c79c1af2..f106780e3 100644
--- a/test/libcxx/strings/version.pass.cpp
+++ b/test/libcxx/strings/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/thread/futures/futures.promise/set_exception.pass.cpp b/test/libcxx/thread/futures/futures.promise/set_exception.pass.cpp
index 805aee138..78a8aaaa5 100644
--- a/test/libcxx/thread/futures/futures.promise/set_exception.pass.cpp
+++ b/test/libcxx/thread/futures/futures.promise/set_exception.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #include <cassert>
 
 
-int main()
+int main(int, char**)
 {
     typedef std::__libcpp_debug_exception ExType;
     {
@@ -53,4 +52,6 @@ int main()
         } catch (ExType const&) {
         }
     }
+
+  return 0;
 }
diff --git a/test/libcxx/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp b/test/libcxx/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp
index 88061bb5f..baf5ba9bf 100644
--- a/test/libcxx/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp
+++ b/test/libcxx/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #include <cassert>
 
 
-int main()
+int main(int, char**)
 {
     typedef std::__libcpp_debug_exception ExType;
     {
@@ -53,4 +52,6 @@ int main()
         } catch (ExType const& value) {
         }
     }
+
+  return 0;
 }
diff --git a/test/libcxx/thread/futures/futures.task/types.pass.cpp b/test/libcxx/thread/futures/futures.task/types.pass.cpp
index cb0fb803c..75bf29503 100644
--- a/test/libcxx/thread/futures/futures.task/types.pass.cpp
+++ b/test/libcxx/thread/futures/futures.task/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -25,7 +24,9 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::packaged_task<A(int, char)>::result_type, A>::value), "");
+
+  return 0;
 }
diff --git a/test/libcxx/thread/futures/version.pass.cpp b/test/libcxx/thread/futures/version.pass.cpp
index 6730a1477..fd2c30433 100644
--- a/test/libcxx/thread/futures/version.pass.cpp
+++ b/test/libcxx/thread/futures/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,6 +16,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp b/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp
index 7463b78af..2ad5c6256 100644
--- a/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp
+++ b/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -46,7 +45,7 @@ void* func(void*)
     return nullptr;
 }
 
-int main()
+int main(int, char**)
 {
     {
     std::unique_lock<std::mutex> lk(mut);
@@ -73,4 +72,6 @@ int main()
     assert(t1-t0 > ms(250));
     t.join();
     }
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp b/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp
index 62e618186..4b983ff05 100644
--- a/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp
+++ b/test/libcxx/thread/thread.condition/thread.condition.condvar/native_handle.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,11 +20,13 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::condition_variable::native_handle_type,
                                 pthread_cond_t*>::value), "");
     std::condition_variable cv;
     std::condition_variable::native_handle_type h = cv.native_handle();
     assert(h != nullptr);
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.condition/version.pass.cpp b/test/libcxx/thread/thread.condition/version.pass.cpp
index 12a775e83..2354b3b9f 100644
--- a/test/libcxx/thread/thread.condition/version.pass.cpp
+++ b/test/libcxx/thread/thread.condition/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,6 +16,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/native_handle.pass.cpp b/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/native_handle.pass.cpp
index 161815500..b85efcb64 100644
--- a/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/native_handle.pass.cpp
+++ b/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/native_handle.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,9 +20,11 @@
 #include <mutex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::mutex m;
     pthread_mutex_t* h = m.native_handle();
     assert(h);
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/native_handle.pass.cpp b/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/native_handle.pass.cpp
index f8f404080..4a6c53995 100644
--- a/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/native_handle.pass.cpp
+++ b/test/libcxx/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/native_handle.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,9 +20,11 @@
 #include <mutex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::recursive_mutex m;
     pthread_mutex_t* h = m.native_handle();
     assert(h);
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp b/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
index d9ac92c27..65a1d6e12 100644
--- a/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
+++ b/test/libcxx/thread/thread.mutex/thread_safety_annotations_not_enabled.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 
 #include <mutex>
 
-int main() {
+int main(int, char**) {
   std::mutex m;
   m.lock();
   {
     std::unique_lock<std::mutex> g(m, std::adopt_lock);
   }
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp b/test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp
index 74a465719..8f8b6ce1c 100644
--- a/test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp
+++ b/test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,8 +32,10 @@ static void scoped() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   scoped();
   std::lock_guard<std::mutex> lock(m);
   foo++;
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.mutex/thread_safety_lock_unlock.pass.cpp b/test/libcxx/thread/thread.mutex/thread_safety_lock_unlock.pass.cpp
index 3ada120cb..e29801228 100644
--- a/test/libcxx/thread/thread.mutex/thread_safety_lock_unlock.pass.cpp
+++ b/test/libcxx/thread/thread.mutex/thread_safety_lock_unlock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,8 +23,10 @@
 std::mutex m;
 int foo __attribute__((guarded_by(m)));
 
-int main() {
+int main(int, char**) {
   m.lock();
   foo++;
   m.unlock();
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.mutex/thread_safety_missing_unlock.fail.cpp b/test/libcxx/thread/thread.mutex/thread_safety_missing_unlock.fail.cpp
index cf3e63847..7dd3f5da2 100644
--- a/test/libcxx/thread/thread.mutex/thread_safety_missing_unlock.fail.cpp
+++ b/test/libcxx/thread/thread.mutex/thread_safety_missing_unlock.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,6 +22,8 @@
 
 std::mutex m;
 
-int main() {
+int main(int, char**) {
   m.lock();
+
+  return 0;
 } // expected-error {{mutex 'm' is still held at the end of function}}
diff --git a/test/libcxx/thread/thread.mutex/thread_safety_requires_capability.pass.cpp b/test/libcxx/thread/thread.mutex/thread_safety_requires_capability.pass.cpp
index e0681048d..2e427f217 100644
--- a/test/libcxx/thread/thread.mutex/thread_safety_requires_capability.pass.cpp
+++ b/test/libcxx/thread/thread.mutex/thread_safety_requires_capability.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ void increment() __attribute__((requires_capability(m))) {
   foo++;
 }
 
-int main() {
+int main(int, char**) {
   m.lock();
   increment();
   m.unlock();
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.mutex/version.pass.cpp b/test/libcxx/thread/thread.mutex/version.pass.cpp
index 81b52c792..abe4fda96 100644
--- a/test/libcxx/thread/thread.mutex/version.pass.cpp
+++ b/test/libcxx/thread/thread.mutex/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.threads/thread.thread.class/thread.thread.member/native_handle.pass.cpp b/test/libcxx/thread/thread.threads/thread.thread.class/thread.thread.member/native_handle.pass.cpp
index c818474ba..1bf7e521d 100644
--- a/test/libcxx/thread/thread.threads/thread.thread.class/thread.thread.member/native_handle.pass.cpp
+++ b/test/libcxx/thread/thread.threads/thread.thread.class/thread.thread.member/native_handle.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -44,7 +43,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -53,4 +52,6 @@ int main()
         assert(pid != 0);
         t0.join();
     }
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.threads/thread.thread.class/types.pass.cpp b/test/libcxx/thread/thread.threads/thread.thread.class/types.pass.cpp
index e801fc46a..4f6bd1206 100644
--- a/test/libcxx/thread/thread.threads/thread.thread.class/types.pass.cpp
+++ b/test/libcxx/thread/thread.threads/thread.thread.class/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,9 @@
 #include <thread>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::thread::native_handle_type, pthread_t>::value), "");
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp b/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp
index 3c0571bf9..f11f40611 100644
--- a/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp
+++ b/test/libcxx/thread/thread.threads/thread.thread.this/sleep_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -35,7 +34,7 @@
 
 void sig_action(int) {}
 
-int main()
+int main(int, char**)
 {
     int ec;
     struct sigaction action;
@@ -65,4 +64,6 @@ int main()
     std::chrono::nanoseconds err = 5 * ms / 100;
     // The time slept is within 5% of 500ms
     assert(std::abs(ns.count()) < err.count());
+
+  return 0;
 }
diff --git a/test/libcxx/thread/thread.threads/version.pass.cpp b/test/libcxx/thread/thread.threads/version.pass.cpp
index d16b0eb06..3d7866228 100644
--- a/test/libcxx/thread/thread.threads/version.pass.cpp
+++ b/test/libcxx/thread/thread.threads/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,6 +16,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/type_traits/convert_to_integral.pass.cpp b/test/libcxx/type_traits/convert_to_integral.pass.cpp
index 8cac0c7d8..08b6b5e8b 100644
--- a/test/libcxx/type_traits/convert_to_integral.pass.cpp
+++ b/test/libcxx/type_traits/convert_to_integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -80,7 +79,7 @@ enum enum2 : unsigned long {
   value = std::numeric_limits<unsigned long>::max()
 };
 
-int main()
+int main(int, char**)
 {
   check_integral_types<bool, int>();
   check_integral_types<char, int>();
@@ -106,4 +105,6 @@ int main()
   check_enum_types<enum1, decltype(((Enum1UT)1) + 1)>();
   typedef std::underlying_type<enum2>::type Enum2UT;
   check_enum_types<enum2, decltype(((Enum2UT)1) + 1)>();
+
+  return 0;
 }
diff --git a/test/libcxx/type_traits/lazy_metafunctions.pass.cpp b/test/libcxx/type_traits/lazy_metafunctions.pass.cpp
index 8cf47a039..2ea1d6891 100644
--- a/test/libcxx/type_traits/lazy_metafunctions.pass.cpp
+++ b/test/libcxx/type_traits/lazy_metafunctions.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -129,9 +128,11 @@ void LazyOrTest() {
 }
 
 
-int main() {
+int main(int, char**) {
     LazyEnableIfTest();
     LazyNotTest();
     LazyAndTest();
     LazyOrTest();
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/any/size_and_alignment.pass.cpp b/test/libcxx/utilities/any/size_and_alignment.pass.cpp
index a1bdf1604..4e3646660 100644
--- a/test/libcxx/utilities/any/size_and_alignment.pass.cpp
+++ b/test/libcxx/utilities/any/size_and_alignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <any>
 
-int main()
+int main(int, char**)
 {
     using std::any;
     static_assert(sizeof(any) == sizeof(void*)*4, "");
     static_assert(alignof(any) == alignof(void*), "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/any/small_type.pass.cpp b/test/libcxx/utilities/any/small_type.pass.cpp
index 54de0c3ea..9df6efc14 100644
--- a/test/libcxx/utilities/any/small_type.pass.cpp
+++ b/test/libcxx/utilities/any/small_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ struct alignas(DoubleBufferAlignment) OverSizeAndAlignedType {
     char buff[BufferSize + 1];
 };
 
-int main()
+int main(int, char**)
 {
     using std::any;
     using std::__any_imp::_IsSmallObject;
@@ -111,4 +110,6 @@ int main()
         static_assert(alignof(T) > BufferAlignment, "");
         static_assert(!_IsSmallObject<T>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/any/version.pass.cpp b/test/libcxx/utilities/any/version.pass.cpp
index 5edee710d..ee5bc9928 100644
--- a/test/libcxx/utilities/any/version.pass.cpp
+++ b/test/libcxx/utilities/any/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/func.require/bullet_1_2_3.pass.cpp b/test/libcxx/utilities/function.objects/func.require/bullet_1_2_3.pass.cpp
index 7fb1568c0..28ee3a39a 100644
--- a/test/libcxx/utilities/function.objects/func.require/bullet_1_2_3.pass.cpp
+++ b/test/libcxx/utilities/function.objects/func.require/bullet_1_2_3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -272,7 +271,7 @@ void test_derived_from_ref_wrap() {
 }
 #endif
 
-int main() {
+int main(int, char**) {
     typedef void*& R;
     typedef ArgType A;
     TestCase<R(),                                   0, Q_None>::run();
@@ -368,4 +367,6 @@ int main() {
 
     test_derived_from_ref_wrap();
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/func.require/bullet_4_5_6.pass.cpp b/test/libcxx/utilities/function.objects/func.require/bullet_4_5_6.pass.cpp
index 58bb5fd10..ff7549d29 100644
--- a/test/libcxx/utilities/function.objects/func.require/bullet_4_5_6.pass.cpp
+++ b/test/libcxx/utilities/function.objects/func.require/bullet_4_5_6.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -207,10 +206,12 @@ private:
 
 
 
-int main() {
+int main(int, char**) {
     TestCase<ArgType>::run();
     TestCase<ArgType const>::run();
     TestCase<ArgType volatile>::run();
     TestCase<ArgType const volatile>::run();
     TestCase<ArgType*>::run();
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/func.require/bullet_7.pass.cpp b/test/libcxx/utilities/function.objects/func.require/bullet_7.pass.cpp
index 0d14a350c..fb789fa0a 100644
--- a/test/libcxx/utilities/function.objects/func.require/bullet_7.pass.cpp
+++ b/test/libcxx/utilities/function.objects/func.require/bullet_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -248,7 +247,7 @@ void runTestCase() {
     runFunctorTestCase <Sig, Arity, LValueCaster, ArgCaster>();
 };
 
-int main() {
+int main(int, char**) {
     typedef void*& R;
     typedef ArgType A;
     typedef A const CA;
@@ -324,4 +323,6 @@ int main() {
     runFunctorTestCase11<R(A&&) const volatile &&, 1, MoveCVCaster,       MC>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/func.require/invoke.pass.cpp b/test/libcxx/utilities/function.objects/func.require/invoke.pass.cpp
index 1d4251354..e534553a8 100644
--- a/test/libcxx/utilities/function.objects/func.require/invoke.pass.cpp
+++ b/test/libcxx/utilities/function.objects/func.require/invoke.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct Type
 #endif
 };
 
-int main()
+int main(int, char**)
 {
     static_assert(sizeof(std::__invoke(&Type::f1, std::declval<Type        >())) == 1, "");
     static_assert(sizeof(std::__invoke(&Type::f2, std::declval<Type const  >())) == 2, "");
@@ -42,4 +41,6 @@ int main()
     static_assert(sizeof(std::__invoke(&Type::g3, std::declval<Type      &&>())) == 3, "");
     static_assert(sizeof(std::__invoke(&Type::g4, std::declval<Type const&&>())) == 4, "");
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/func.require/invoke_helpers.h b/test/libcxx/utilities/function.objects/func.require/invoke_helpers.h
index f2a5b08da..766026913 100644
--- a/test/libcxx/utilities/function.objects/func.require/invoke_helpers.h
+++ b/test/libcxx/utilities/function.objects/func.require/invoke_helpers.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/libcxx/utilities/function.objects/refwrap/binary.pass.cpp b/test/libcxx/utilities/function.objects/refwrap/binary.pass.cpp
index 579e81fe6..1f5bbcdef 100644
--- a/test/libcxx/utilities/function.objects/refwrap/binary.pass.cpp
+++ b/test/libcxx/utilities/function.objects/refwrap/binary.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ struct C
     typedef int result_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((!std::is_base_of<std::binary_function<int, char, int>,
                                     std::reference_wrapper<functor1> >::value), "");
@@ -77,4 +76,6 @@ int main()
                                    std::reference_wrapper<float(C::*)(int)> >::value), "");
     static_assert((std::is_base_of<std::binary_function<const volatile C*, int, float>,
                                    std::reference_wrapper<float(C::*)(int) const volatile> >::value), "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/refwrap/unary.pass.cpp b/test/libcxx/utilities/function.objects/refwrap/unary.pass.cpp
index 528a8f327..429722e47 100644
--- a/test/libcxx/utilities/function.objects/refwrap/unary.pass.cpp
+++ b/test/libcxx/utilities/function.objects/refwrap/unary.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ struct C
     typedef int result_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::unary_function<int, char>,
                                    std::reference_wrapper<functor1> >::value), "");
@@ -75,4 +74,6 @@ int main()
                                    std::reference_wrapper<float(C::*)() const volatile> >::value), "");
     static_assert((!std::is_base_of<std::unary_function<C*, float>,
                                    std::reference_wrapper<float(C::*)(int)> >::value), "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp b/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp
index 319a78b05..54f4db764 100644
--- a/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp
+++ b/test/libcxx/utilities/function.objects/unord.hash/murmur2_or_cityhash_ubsan_unsigned_overflow_ignored.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ void test(const void* key, int len) {
   }
 }
 
-int main() {
+int main(int, char**) {
   const std::string TestCases[] = {
       "abcdaoeuaoeclaoeoaeuaoeuaousaotehu]+}sthoasuthaoesutahoesutaohesutaoeusaoetuhasoetuhaoseutaoseuthaoesutaohes"
       "00000000000000000000000000000000000000000000000000000000000000000000000",
@@ -38,4 +37,6 @@ int main() {
   const size_t NumCases = sizeof(TestCases)/sizeof(TestCases[0]);
   for (size_t i=0; i < NumCases; ++i)
     test(TestCases[i].data(), TestCases[i].length());
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/function.objects/version.pass.cpp b/test/libcxx/utilities/function.objects/version.pass.cpp
index 99d731a74..6f8540f1a 100644
--- a/test/libcxx/utilities/function.objects/version.pass.cpp
+++ b/test/libcxx/utilities/function.objects/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_cxx03.pass.cpp b/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_cxx03.pass.cpp
index 6d49cea8b..deab4368a 100644
--- a/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_cxx03.pass.cpp
+++ b/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_cxx03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ void test_pr26961() {
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef TEST_IS_UNSUPPORTED
   {
@@ -43,4 +42,6 @@ int main()
     test_pr26961();
   }
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_new_abi.pass.cpp b/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_new_abi.pass.cpp
index 752edb6da..c8e0c7292 100644
--- a/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_new_abi.pass.cpp
+++ b/test/libcxx/utilities/memory/util.dynamic.safety/get_pointer_safety_new_abi.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
   {
     static_assert(std::is_enum<std::pointer_safety>::value, "");
@@ -35,4 +34,6 @@ int main()
            r == std::pointer_safety::preferred ||
            r == std::pointer_safety::strict);
   }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/memory/util.smartptr/race_condition.pass.cpp b/test/libcxx/utilities/memory/util.smartptr/race_condition.pass.cpp
index fce8443eb..bf12e1459 100644
--- a/test/libcxx/utilities/memory/util.smartptr/race_condition.pass.cpp
+++ b/test/libcxx/utilities/memory/util.smartptr/race_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -78,7 +77,7 @@ void run_test(Ptr p) {
     assert(p.use_count() == 3);
 }
 
-int main() {
+int main(int, char**) {
   {
     // Test with out-of-place shared_count.
     Ptr p(new int(42));
@@ -92,4 +91,6 @@ int main() {
     run_test(p);
     assert(p.use_count() == 1);
   }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp b/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp
index c94ce75fe..e9b4257a7 100644
--- a/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp
+++ b/test/libcxx/utilities/memory/util.smartptr/util.smartptr.shared/function_type_default_deleter.fail.cpp
@@ -29,7 +29,7 @@ struct Deleter {
   }
 };
 
-int main() {
+int main(int, char**) {
   {
     SPtr<0> s; // OK
     SPtr<1> s1(nullptr); // OK
@@ -41,4 +41,6 @@ int main() {
     SPtr<4> s4(getFn<4>()); // expected-note {{requested here}}
     SPtr<5> s5(getFn<5>(), std::default_delete<FnType<5>>{}); // expected-note {{requested here}}
   }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/memory/version.pass.cpp b/test/libcxx/utilities/memory/version.pass.cpp
index 790c08a3b..5b10e1425 100644
--- a/test/libcxx/utilities/memory/version.pass.cpp
+++ b/test/libcxx/utilities/memory/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/meta/is_referenceable.pass.cpp b/test/libcxx/utilities/meta/is_referenceable.pass.cpp
index 42b1f2dc3..bdd0a4574 100644
--- a/test/libcxx/utilities/meta/is_referenceable.pass.cpp
+++ b/test/libcxx/utilities/meta/is_referenceable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -190,4 +189,6 @@ static_assert(( std::__is_referenceable<void (Foo::*)(int, float, Foo &, ...) &&
 static_assert(( std::__is_referenceable<void (Foo::*)(int, float, Foo &, ...) const &&>::value), "");
 #endif
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/__has_operator_addressof.pass.cpp b/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/__has_operator_addressof.pass.cpp
index 886884234..80bd2e738 100644
--- a/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/__has_operator_addressof.pass.cpp
+++ b/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/__has_operator_addressof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ struct J
 };
 
 
-int main()
+int main(int, char**)
 {
     static_assert(std::__has_operator_addressof<int>::value == false, "");
     static_assert(std::__has_operator_addressof<A>::value == false, "");
@@ -66,4 +65,6 @@ int main()
     static_assert(std::__has_operator_addressof<G>::value == true, "");
     static_assert(std::__has_operator_addressof<H>::value == true, "");
     static_assert(std::__has_operator_addressof<J>::value == true, "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/missing_is_aggregate_trait.fail.cpp b/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/missing_is_aggregate_trait.fail.cpp
index e3e083bfb..8606769ee 100644
--- a/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/missing_is_aggregate_trait.fail.cpp
+++ b/test/libcxx/utilities/meta/meta.unary/meta.unary.prop/missing_is_aggregate_trait.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include <type_traits>
 
-int main ()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_NO_IS_AGGREGATE
   // This should not compile when _LIBCPP_HAS_NO_IS_AGGREGATE is defined.
@@ -25,4 +24,6 @@ int main ()
 #else
 #error Forcing failure...
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/meta/version.pass.cpp b/test/libcxx/utilities/meta/version.pass.cpp
index 3a1033bbb..7f4cbd841 100644
--- a/test/libcxx/utilities/meta/version.pass.cpp
+++ b/test/libcxx/utilities/meta/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp b/test/libcxx/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp
index cc04e4e87..1f559904c 100644
--- a/test/libcxx/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp
+++ b/test/libcxx/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ test()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     {
         using T = int;
@@ -71,4 +70,6 @@ int main()
 
     static_assert(!(std::is_copy_assignable<optional<Z1>>::value), "");
     static_assert(!(std::is_copy_assignable<optional<Z2>>::value), "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/optional/optional.object/optional.object.assign/move.pass.cpp b/test/libcxx/utilities/optional/optional.object/optional.object.assign/move.pass.cpp
index 6f421153c..325bcb452 100644
--- a/test/libcxx/utilities/optional/optional.object/optional.object.assign/move.pass.cpp
+++ b/test/libcxx/utilities/optional/optional.object/optional.object.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ test()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     {
         using T = int;
@@ -68,4 +67,6 @@ int main()
 
     static_assert(!(std::is_move_assignable<optional<Z1>>::value), "");
     static_assert(!(std::is_move_assignable<optional<Z2>>::value), "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp b/test/libcxx/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp
index 62eb6cd34..694ab0156 100644
--- a/test/libcxx/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp
+++ b/test/libcxx/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ struct Z
     Z& operator=(const Z&) = delete;
 };
 
-int main()
+int main(int, char**)
 {
     {
         using T = int;
@@ -56,4 +55,6 @@ int main()
     static_assert(!(std::is_trivially_copy_constructible<optional<std::string>>::value), "");
 
     static_assert(!(std::is_copy_constructible<optional<Z>>::value), "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp b/test/libcxx/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
index f13ca92e2..383eaa986 100644
--- a/test/libcxx/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
+++ b/test/libcxx/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct Z
     Z& operator=(const Z&) = delete;
 };
 
-int main()
+int main(int, char**)
 {
     {
         using T = int;
@@ -57,4 +56,6 @@ int main()
     static_assert(!(std::is_trivially_move_constructible<optional<std::string>>::value), "");
 
     static_assert(!(std::is_move_constructible<optional<Z>>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/special_member_gen.pass.cpp b/test/libcxx/utilities/optional/optional.object/triviality.abi.pass.cpp
index 0b9b6e717..36f5bb937 100644
--- a/test/std/utilities/optional/optional.object/special_member_gen.pass.cpp
+++ b/test/libcxx/utilities/optional/optional.object/triviality.abi.pass.cpp
@@ -1,15 +1,24 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
+
 // <optional>
 
+// This test asserts the triviality of special member functions of optional<T>
+// whenever T has these special member functions trivial. The goal of this test
+// is to make sure that we do not change the triviality of those, since that
+// constitues an ABI break (small enough optionals would be passed by registers).
+//
+// constexpr optional(const optional& rhs);
+// constexpr optional(optional&& rhs) noexcept(see below);
+// constexpr optional<T>& operator=(const optional& rhs);
+// constexpr optional<T>& operator=(optional&& rhs) noexcept(see below);
 
 #include <optional>
 #include <type_traits>
@@ -21,41 +30,27 @@ template <class T>
 struct SpecialMemberTest {
     using O = std::optional<T>;
 
-    static_assert(std::is_default_constructible_v<O>,
-        "optional is always default constructible.");
-    static_assert(std::is_copy_constructible_v<O> == std::is_copy_constructible_v<T>,
-        "optional<T> is copy constructible if and only if T is copy constructible.");
-    static_assert(std::is_move_constructible_v<O> ==
-        (std::is_copy_constructible_v<T> || std::is_move_constructible_v<T>),
-        "optional<T> is move constructible if and only if T is copy or move constructible.");
-    static_assert(std::is_copy_assignable_v<O> ==
-        (std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>),
-        "optional<T> is copy assignable if and only if T is both copy "
-        "constructible and copy assignable.");
-    static_assert(std::is_move_assignable_v<O> ==
-        ((std::is_move_constructible_v<T> && std::is_move_assignable_v<T>) ||
-         (std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>)),
-        "optional<T> is move assignable if and only if T is both move constructible and "
-        "move assignable, or both copy constructible and copy assignable.");
-
-    // The following tests are for not-yet-standardized behavior (P0602):
     static_assert(std::is_trivially_destructible_v<O> ==
         std::is_trivially_destructible_v<T>,
         "optional<T> is trivially destructible if and only if T is.");
+
     static_assert(std::is_trivially_copy_constructible_v<O> ==
         std::is_trivially_copy_constructible_v<T>,
         "optional<T> is trivially copy constructible if and only if T is.");
+
     static_assert(std::is_trivially_move_constructible_v<O> ==
         std::is_trivially_move_constructible_v<T> ||
         (!std::is_move_constructible_v<T> && std::is_trivially_copy_constructible_v<T>),
         "optional<T> is trivially move constructible if T is trivially move constructible, "
         "or if T is trivially copy constructible and is not move constructible.");
+
     static_assert(std::is_trivially_copy_assignable_v<O> ==
         (std::is_trivially_destructible_v<T> &&
          std::is_trivially_copy_constructible_v<T> &&
          std::is_trivially_copy_assignable_v<T>),
         "optional<T> is trivially copy assignable if and only if T is trivially destructible, "
         "trivially copy constructible, and trivially copy assignable.");
+
     static_assert(std::is_trivially_move_assignable_v<O> ==
         (std::is_trivially_destructible_v<T> &&
          ((std::is_trivially_move_constructible_v<T> && std::is_trivially_move_assignable_v<T>) ||
@@ -90,7 +85,7 @@ struct TrivialCopyNonTrivialMove {
     TrivialCopyNonTrivialMove& operator=(TrivialCopyNonTrivialMove&&) { return *this; }
 };
 
-int main()
+int main(int, char**)
 {
     sink(
         ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
@@ -99,4 +94,6 @@ int main()
         NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
         DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
     );
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/optional/version.pass.cpp b/test/libcxx/utilities/optional/version.pass.cpp
index e7581b543..49b263a37 100644
--- a/test/libcxx/utilities/optional/version.pass.cpp
+++ b/test/libcxx/utilities/optional/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/ratio/version.pass.cpp b/test/libcxx/utilities/ratio/version.pass.cpp
index 26c455fb0..112111c37 100644
--- a/test/libcxx/utilities/ratio/version.pass.cpp
+++ b/test/libcxx/utilities/ratio/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/template.bitset/includes.pass.cpp b/test/libcxx/utilities/template.bitset/includes.pass.cpp
index 2e3c2812e..3ec17b079 100644
--- a/test/libcxx/utilities/template.bitset/includes.pass.cpp
+++ b/test/libcxx/utilities/template.bitset/includes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@
 #error <iosfwd> has not been included
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/template.bitset/version.pass.cpp b/test/libcxx/utilities/template.bitset/version.pass.cpp
index 5ae984c00..94df4d1ba 100644
--- a/test/libcxx/utilities/template.bitset/version.pass.cpp
+++ b/test/libcxx/utilities/template.bitset/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/time/date.time/asctime.thread-unsafe.fail.cpp b/test/libcxx/utilities/time/date.time/asctime.thread-unsafe.fail.cpp
index 3a9749e21..ed49ac286 100644
--- a/test/libcxx/utilities/time/date.time/asctime.thread-unsafe.fail.cpp
+++ b/test/libcxx/utilities/time/date.time/asctime.thread-unsafe.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,8 +10,10 @@
 
 #include <ctime>
 
-int main() {
+int main(int, char**) {
     // asctime is not thread-safe.
     std::time_t t = 0;
     std::asctime(&t);
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/time/date.time/ctime.thread-unsafe.fail.cpp b/test/libcxx/utilities/time/date.time/ctime.thread-unsafe.fail.cpp
index cd246c631..741de667e 100644
--- a/test/libcxx/utilities/time/date.time/ctime.thread-unsafe.fail.cpp
+++ b/test/libcxx/utilities/time/date.time/ctime.thread-unsafe.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,8 +10,10 @@
 
 #include <ctime>
 
-int main() {
+int main(int, char**) {
     // ctime is not thread-safe.
     std::time_t t = 0;
     std::ctime(&t);
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/time/date.time/gmtime.thread-unsafe.fail.cpp b/test/libcxx/utilities/time/date.time/gmtime.thread-unsafe.fail.cpp
index a6debcbd9..ce7f78203 100644
--- a/test/libcxx/utilities/time/date.time/gmtime.thread-unsafe.fail.cpp
+++ b/test/libcxx/utilities/time/date.time/gmtime.thread-unsafe.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,8 +10,10 @@
 
 #include <ctime>
 
-int main() {
+int main(int, char**) {
     // gmtime is not thread-safe.
     std::time_t t = 0;
     std::gmtime(&t);
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/time/date.time/localtime.thread-unsafe.fail.cpp b/test/libcxx/utilities/time/date.time/localtime.thread-unsafe.fail.cpp
index c9e55c8fd..8f803d91c 100644
--- a/test/libcxx/utilities/time/date.time/localtime.thread-unsafe.fail.cpp
+++ b/test/libcxx/utilities/time/date.time/localtime.thread-unsafe.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,8 +10,10 @@
 
 #include <ctime>
 
-int main() {
+int main(int, char**) {
     // localtime is not thread-safe.
     std::time_t t = 0;
     std::localtime(&t);
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/time/version.pass.cpp b/test/libcxx/utilities/time/version.pass.cpp
index bfa3f6d67..d1093dd4a 100644
--- a/test/libcxx/utilities/time/version.pass.cpp
+++ b/test/libcxx/utilities/time/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/tuple/tuple.tuple/empty_member.pass.cpp b/test/libcxx/utilities/tuple/tuple.tuple/empty_member.pass.cpp
index 1e7243b5f..209382087 100644
--- a/test/libcxx/utilities/tuple/tuple.tuple/empty_member.pass.cpp
+++ b/test/libcxx/utilities/tuple/tuple.tuple/empty_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ struct A {};
 
 struct B {};
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<int, A> T;
@@ -43,4 +42,6 @@ int main()
         typedef std::tuple<int, A, B> T;
         static_assert((sizeof(T) == sizeof(int)), "");
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.fail.cpp b/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.fail.cpp
index cc222a70e..a4c43ba5d 100644
--- a/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.fail.cpp
+++ b/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ template <class ...Args>
 void F(typename CannotDeduce<std::tuple<Args...>>::type const&) {}
 
 
-int main() {
+int main(int, char**) {
 #if TEST_HAS_BUILTIN_IDENTIFIER(__reference_binds_to_temporary)
   // Test that we emit our diagnostic from the library.
   // expected-error@tuple:* 8 {{"Attempted construction of reference element binds to a temporary whose lifetime has ended"}}
@@ -82,4 +81,6 @@ int main() {
 #error force failure
 // expected-error@-1 {{force failure}}
 #endif
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/disable_reduced_arity_initialization_extension.pass.cpp b/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/disable_reduced_arity_initialization_extension.pass.cpp
index 4808c51cd..8e4cb52bf 100644
--- a/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/disable_reduced_arity_initialization_extension.pass.cpp
+++ b/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/disable_reduced_arity_initialization_extension.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -78,7 +77,7 @@ void test_example_from_docs() {
   assert(std::get<2>(tup) == std::error_code{});
 }
 
-int main()
+int main(int, char**)
 {
     {
         using E = MoveOnly;
@@ -105,4 +104,6 @@ int main()
     // constructor extensions.
     test_default_constructible_extension_sfinae();
     test_example_from_docs();
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/enable_reduced_arity_initialization_extension.pass.cpp b/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/enable_reduced_arity_initialization_extension.pass.cpp
index 99b6eb78f..f012d4c5f 100644
--- a/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/enable_reduced_arity_initialization_extension.pass.cpp
+++ b/test/libcxx/utilities/tuple/tuple.tuple/tuple.cnstr/enable_reduced_arity_initialization_extension.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -90,7 +89,7 @@ void test_example_from_docs() {
   assert(std::get<2>(tup) == std::error_code{});
 }
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -114,4 +113,6 @@ int main()
     // constructor extensions.
     test_default_constructible_extension_sfinae();
     test_example_from_docs();
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/tuple/version.pass.cpp b/test/libcxx/utilities/tuple/version.pass.cpp
index 2fdbb5d27..28232a99b 100644
--- a/test/libcxx/utilities/tuple/version.pass.cpp
+++ b/test/libcxx/utilities/tuple/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/type.index/version.pass.cpp b/test/libcxx/utilities/type.index/version.pass.cpp
index 26f462042..38cd0254a 100644
--- a/test/libcxx/utilities/type.index/version.pass.cpp
+++ b/test/libcxx/utilities/type.index/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/__is_inplace_index.pass.cpp b/test/libcxx/utilities/utility/__is_inplace_index.pass.cpp
index 073cfac07..a2559f208 100644
--- a/test/libcxx/utilities/utility/__is_inplace_index.pass.cpp
+++ b/test/libcxx/utilities/utility/__is_inplace_index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 struct S {};
 
-int main() {
+int main(int, char**) {
   using I = std::in_place_index_t<0>;
   static_assert( std::__is_inplace_index<I>::value, "");
   static_assert( std::__is_inplace_index<const I>::value, "");
@@ -31,4 +30,6 @@ int main() {
   static_assert(!std::__is_inplace_index<void>::value, "");
   static_assert(!std::__is_inplace_index<int>::value, "");
   static_assert(!std::__is_inplace_index<S>::value, "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/__is_inplace_type.pass.cpp b/test/libcxx/utilities/utility/__is_inplace_type.pass.cpp
index 54e22a093..534fb5059 100644
--- a/test/libcxx/utilities/utility/__is_inplace_type.pass.cpp
+++ b/test/libcxx/utilities/utility/__is_inplace_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 struct S {};
 
-int main() {
+int main(int, char**) {
   using T = std::in_place_type_t<int>;
   static_assert( std::__is_inplace_type<T>::value, "");
   static_assert( std::__is_inplace_type<const T>::value, "");
@@ -31,4 +30,6 @@ int main() {
   static_assert(!std::__is_inplace_type<void>::value, "");
   static_assert(!std::__is_inplace_type<int>::value, "");
   static_assert(!std::__is_inplace_type<S>::value, "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/U_V.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/U_V.pass.cpp
index 6a3e613e9..e03fa6d7f 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/U_V.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct ImplicitNothrowT {
     int value;
 };
 
-int main() {
+int main(int, char**) {
     { // explicit noexcept test
         static_assert(!std::is_nothrow_constructible<std::pair<ExplicitT, ExplicitT>, int, int>::value, "");
         static_assert(!std::is_nothrow_constructible<std::pair<ExplicitNothrowT, ExplicitT>, int, int>::value, "");
@@ -51,4 +50,6 @@ int main() {
         static_assert(!std::is_nothrow_constructible<std::pair<ImplicitT, ImplicitNothrowT>, int, int>::value, "");
         static_assert( std::is_nothrow_constructible<std::pair<ImplicitNothrowT, ImplicitNothrowT>, int, int>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/assign_tuple_like.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/assign_tuple_like.pass.cpp
index 0e0117e4e..5765700fe 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/assign_tuple_like.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/assign_tuple_like.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #pragma clang diagnostic ignored "-Wmissing-braces"
 #endif
 
-int main()
+int main(int, char**)
 {
     using C = TestTypes::TestType;
     {
@@ -101,4 +100,6 @@ int main()
        assert(p.first.value == 42);
        assert(p.second.value == -42);
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp
index 6a2401223..a2fac173e 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct ImplicitNothrowT {
     ImplicitNothrowT(ImplicitNothrowT const&) noexcept {}
 };
 
-int main() {
+int main(int, char**) {
     { // explicit noexcept test
         static_assert(!std::is_nothrow_constructible<std::pair<ExplicitT, ExplicitT>,
                                                      ExplicitT const&, ExplicitT const&>::value, "");
@@ -59,4 +58,6 @@ int main() {
         static_assert( std::is_nothrow_constructible<std::pair<ImplicitNothrowT, ImplicitNothrowT>,
                                                      ImplicitNothrowT const&, ImplicitNothrowT const&>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
index edb3bbf64..16d714ab9 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct ImplicitNothrowT {
     int value;
 };
 
-int main() {
+int main(int, char**) {
     { // explicit noexcept test
         static_assert(!std::is_nothrow_constructible<std::pair<ExplicitT, ExplicitT>,
                                                      std::pair<int, int> const&>::value, "");
@@ -61,4 +60,6 @@ int main() {
         static_assert( std::is_nothrow_constructible<std::pair<ImplicitNothrowT, ImplicitNothrowT>,
                                                      std::pair<int, int> const&>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/default.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/default.pass.cpp
index 2dbf5511d..a7f0f8764 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/default.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,10 +26,12 @@ struct NonThrowingDefault {
   NonThrowingDefault() noexcept { }
 };
 
-int main() {
+int main(int, char**) {
 
     static_assert(!std::is_nothrow_default_constructible<std::pair<ThrowingDefault, ThrowingDefault>>::value, "");
     static_assert(!std::is_nothrow_default_constructible<std::pair<NonThrowingDefault, ThrowingDefault>>::value, "");
     static_assert(!std::is_nothrow_default_constructible<std::pair<ThrowingDefault, NonThrowingDefault>>::value, "");
     static_assert( std::is_nothrow_default_constructible<std::pair<NonThrowingDefault, NonThrowingDefault>>::value, "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/non_trivial_copy_move_ABI.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/non_trivial_copy_move_ABI.pass.cpp
index 8b5969d51..00c1910a3 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/non_trivial_copy_move_ABI.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/non_trivial_copy_move_ABI.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,6 +29,7 @@
 #include <utility>
 #include <type_traits>
 #include <cstdlib>
+#include <cstddef>
 #include <cassert>
 
 #include "test_macros.h"
@@ -86,7 +86,7 @@ static_assert(!HasNonTrivialABI<Trivial>::value, "");
 #endif
 
 
-int main()
+void test_trivial()
 {
     {
         typedef std::pair<int, short> P;
@@ -150,3 +150,16 @@ int main()
     }
 #endif
 }
+
+void test_layout() {
+    typedef std::pair<std::pair<char, char>, char> PairT;
+    static_assert(sizeof(PairT) == 3, "");
+    static_assert(TEST_ALIGNOF(PairT) == TEST_ALIGNOF(char), "");
+    static_assert(offsetof(PairT, first) == 0, "");
+}
+
+int main(int, char**) {
+    test_trivial();
+    test_layout();
+    return 0;
+}
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/pair.tuple_element.fail.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/pair.tuple_element.fail.cpp
index 8bfeeea5d..5be63dd92 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/pair.tuple_element.fail.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/pair.tuple_element.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 
 #include <utility>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, double> P;
     std::tuple_element<2, P>::type foo; // expected-note {{requested here}}
         // expected-error-re@utility:* {{static_assert failed{{( due to requirement '2U[L]{0,2} < 2')?}} "Index out of bounds in std::tuple_element<std::pair<T1, T2>>"}}
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp
index 81dad3bc2..e4c953840 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "archetypes.hpp"
 
 
-int main() {
+int main(int, char**) {
     using NonThrowingConvert = NonThrowingTypes::ConvertingType;
     using ThrowingConvert = NonTrivialTypes::ConvertingType;
     static_assert(!std::is_nothrow_constructible<std::pair<ThrowingConvert, ThrowingConvert>,
@@ -35,4 +34,6 @@ int main() {
                                                  std::piecewise_construct_t, std::tuple<int, int>, std::tuple<long, long>>::value, "");
     static_assert( std::is_nothrow_constructible<std::pair<NonThrowingConvert, NonThrowingConvert>,
                                                  std::piecewise_construct_t, std::tuple<int, int>, std::tuple<long, long>>::value, "");
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
index 5d8d36262..8cc83f7bd 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct ImplicitNothrowT {
     int value;
 };
 
-int main() {
+int main(int, char**) {
     { // explicit noexcept test
         static_assert(!std::is_nothrow_constructible<std::pair<ExplicitT, ExplicitT>,
                                                      std::pair<int, int>&&>::value, "");
@@ -60,4 +59,6 @@ int main() {
         static_assert( std::is_nothrow_constructible<std::pair<ImplicitNothrowT, ImplicitNothrowT>,
                                                      std::pair<int, int>&&>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/utility/pairs/pairs.pair/trivial_copy_move_ABI.pass.cpp b/test/libcxx/utilities/utility/pairs/pairs.pair/trivial_copy_move_ABI.pass.cpp
index ec9cc7ec3..1086011c3 100644
--- a/test/libcxx/utilities/utility/pairs/pairs.pair/trivial_copy_move_ABI.pass.cpp
+++ b/test/libcxx/utilities/utility/pairs/pairs.pair/trivial_copy_move_ABI.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,6 +24,7 @@
 #include <utility>
 #include <type_traits>
 #include <cstdlib>
+#include <cstddef>
 #include <cassert>
 
 #include "test_macros.h"
@@ -81,7 +81,7 @@ static_assert(HasTrivialABI<Trivial>::value, "");
 #endif
 
 
-int main()
+void test_trivial()
 {
     {
         typedef std::pair<int, short> P;
@@ -145,3 +145,16 @@ int main()
     }
 #endif
 }
+
+void test_layout() {
+    typedef std::pair<std::pair<char, char>, char> PairT;
+    static_assert(sizeof(PairT) == 3, "");
+    static_assert(TEST_ALIGNOF(PairT) == TEST_ALIGNOF(char), "");
+    static_assert(offsetof(PairT, first) == 0, "");
+}
+
+int main(int, char**) {
+    test_trivial();
+    test_layout();
+    return 0;
+}
diff --git a/test/libcxx/utilities/utility/version.pass.cpp b/test/libcxx/utilities/utility/version.pass.cpp
index 77d145d94..ca783db7f 100644
--- a/test/libcxx/utilities/utility/version.pass.cpp
+++ b/test/libcxx/utilities/utility/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/variant/variant.variant/variant.helper/variant_alternative.fail.cpp b/test/libcxx/utilities/variant/variant.variant/variant.helper/variant_alternative.fail.cpp
index c4522682c..fd23d5b94 100644
--- a/test/libcxx/utilities/variant/variant.variant/variant.helper/variant_alternative.fail.cpp
+++ b/test/libcxx/utilities/variant/variant.variant/variant.helper/variant_alternative.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@
 #include <cassert>
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::variant<int, double> T;
         std::variant_alternative<2, T>::type foo; // expected-note {{requested here}}
         // expected-error-re@variant:* {{static_assert failed{{( due to requirement '2U[L]{0,2} < sizeof...\(_Types\)')?}} "Index out of bounds in std::variant_alternative<>"}}
     }
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp b/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp
index a836ef516..1bfe0e9fd 100644
--- a/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp
+++ b/test/libcxx/utilities/variant/variant.variant/variant_size.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,8 @@ struct make_variant_imp;
 
 template <size_t ...Indices>
 struct make_variant_imp<std::integer_sequence<size_t, Indices...>> {
-  using type = std::variant<decltype((Indices, char(0)))...>;
+  template <size_t> using AlwaysChar = char;
+  using type = std::variant<AlwaysChar<Indices>...>;
 };
 
 template <size_t N>
@@ -59,10 +59,12 @@ void test_index_internals() {
   static_assert(std::__variant_npos<IndexT> == IndexLim::max(), "");
 }
 
-int main() {
+int main(int, char**) {
   test_index_type<unsigned char>();
   // This won't compile due to template depth issues.
   //test_index_type<unsigned short>();
   test_index_internals<unsigned char>();
   test_index_internals<unsigned short>();
+
+  return 0;
 }
diff --git a/test/libcxx/utilities/variant/version.pass.cpp b/test/libcxx/utilities/variant/version.pass.cpp
index 1db93e0e9..3ef8ed50c 100644
--- a/test/libcxx/utilities/variant/version.pass.cpp
+++ b/test/libcxx/utilities/variant/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error _LIBCPP_VERSION not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/lit.site.cfg.in b/test/lit.site.cfg.in
index 53f797268..ed9a71105 100644
--- a/test/lit.site.cfg.in
+++ b/test/lit.site.cfg.in
@@ -4,12 +4,12 @@ config.project_obj_root         = "@CMAKE_BINARY_DIR@"
 config.libcxx_src_root          = "@LIBCXX_SOURCE_DIR@"
 config.libcxx_obj_root          = "@LIBCXX_BINARY_DIR@"
 config.cxx_library_root         = "@LIBCXX_LIBRARY_DIR@"
-config.enable_exceptions        = "@LIBCXX_ENABLE_EXCEPTIONS@"
-config.enable_experimental      = "@LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY@"
-config.enable_filesystem        = "@LIBCXX_ENABLE_FILESYSTEM@"
-config.enable_rtti              = "@LIBCXX_ENABLE_RTTI@"
-config.enable_shared            = "@LIBCXX_ENABLE_SHARED@"
-config.enable_32bit             = "@LIBCXX_BUILD_32_BITS@"
+config.enable_exceptions        = @LIBCXX_ENABLE_EXCEPTIONS@
+config.enable_experimental      = @LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY@
+config.enable_filesystem        = @LIBCXX_ENABLE_FILESYSTEM@
+config.enable_rtti              = @LIBCXX_ENABLE_RTTI@
+config.enable_shared            = @LIBCXX_ENABLE_SHARED@
+config.enable_32bit             = @LIBCXX_BUILD_32_BITS@
 config.cxx_abi                  = "@LIBCXX_CXX_ABI_LIBNAME@"
 config.use_sanitizer            = "@LLVM_USE_SANITIZER@"
 config.sanitizer_library        = "@LIBCXX_SANITIZER_LIBRARY@"
@@ -17,22 +17,22 @@ config.abi_library_path         = "@LIBCXX_CXX_ABI_LIBRARY_PATH@"
 config.configuration_variant    = "@LIBCXX_LIT_VARIANT@"
 config.host_triple              = "@LLVM_HOST_TRIPLE@"
 config.target_triple            = "@TARGET_TRIPLE@"
-config.use_target               = len("@LIBCXX_TARGET_TRIPLE@") > 0
+config.use_target               = bool("@LIBCXX_TARGET_TRIPLE@")
 config.sysroot                  = "@LIBCXX_SYSROOT@"
 config.gcc_toolchain            = "@LIBCXX_GCC_TOOLCHAIN@"
-config.generate_coverage        = "@LIBCXX_GENERATE_COVERAGE@"
+config.generate_coverage        = @LIBCXX_GENERATE_COVERAGE@
 config.target_info              = "@LIBCXX_TARGET_INFO@"
 config.test_linker_flags        = "@LIBCXX_TEST_LINKER_FLAGS@"
 config.test_compiler_flags      = "@LIBCXX_TEST_COMPILER_FLAGS@"
 
 config.executor                 = "@LIBCXX_EXECUTOR@"
-config.llvm_unwinder            = "@LIBCXXABI_USE_LLVM_UNWINDER@"
-config.compiler_rt              = "@LIBCXX_USE_COMPILER_RT@"
-config.has_libatomic            = "@LIBCXX_HAS_ATOMIC_LIB@"
-config.use_libatomic            = "@LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB@"
-config.debug_build              = "@LIBCXX_DEBUG_BUILD@"
-config.libcxxabi_shared         = "@LIBCXXABI_ENABLE_SHARED@"
-config.cxx_ext_threads          = "@LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY@"
+config.llvm_unwinder            = @LIBCXXABI_USE_LLVM_UNWINDER@
+config.builtins_library         = "@LIBCXX_BUILTINS_LIBRARY@"
+config.has_libatomic            = @LIBCXX_HAS_ATOMIC_LIB@
+config.use_libatomic            = @LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB@
+config.debug_build              = @LIBCXX_DEBUG_BUILD@
+config.libcxxabi_shared         = @LIBCXXABI_ENABLE_SHARED@
+config.cxx_ext_threads          = @LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY@
 
 # Let the main config do the real work.
 config.loaded_site_config = True
diff --git a/test/nothing_to_do.pass.cpp b/test/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/nothing_to_do.pass.cpp
+++ b/test/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.c.library/tested_elsewhere.pass.cpp b/test/std/algorithms/alg.c.library/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.c.library/tested_elsewhere.pass.cpp
+++ b/test/std/algorithms/alg.c.library/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp
index d2d567f31..9dcace7a0 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ test()
         assert(ia[i] == ib[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<int*> >();
@@ -87,4 +86,6 @@ int main()
 // #if TEST_STD_VER > 17
 //     static_assert(test_constexpr());
 // #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp
index 3a2f0f62c..3b20fbde5 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ test()
         assert(ia[i] == ib[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
@@ -67,4 +66,6 @@ int main()
 // #if TEST_STD_VER > 17
 //     static_assert(test_constexpr());
 // #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.copy/copy_if.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.copy/copy_if.pass.cpp
index 19018151f..903bcbe6c 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.copy/copy_if.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.copy/copy_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ test()
         assert(ib[i] % 3 == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<int*> >();
@@ -94,4 +93,6 @@ int main()
 // #if TEST_STD_VER > 17
 //     static_assert(test_constexpr());
 // #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp
index 0e5fa63a3..2e181cfd4 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ test()
         assert(ia[i] == ib[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<int*> >();
@@ -90,4 +89,6 @@ int main()
 // #if TEST_STD_VER > 17
 //     static_assert(test_constexpr());
 // #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.fill/fill.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.fill/fill.pass.cpp
index 1c08fee40..da56ec30f 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.fill/fill.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.fill/fill.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ test_int()
     assert(ia[3] == 1);
 }
 
-int main()
+int main(int, char**)
 {
     test_char<forward_iterator<char*> >();
     test_char<bidirectional_iterator<char*> >();
@@ -72,4 +71,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
index 1e962990b..e774c915f 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -149,7 +148,7 @@ void test6()
 }
 
 
-int main()
+int main(int, char**)
 {
     test_char<forward_iterator<char*> >();
     test_char<bidirectional_iterator<char*> >();
@@ -171,4 +170,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.generate/generate.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.generate/generate.pass.cpp
index 1b1562866..29d32d715 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.generate/generate.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.generate/generate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ test()
     assert(ia[3] == 1);
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -62,4 +61,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp
index 7e81610ac..4ffdc648f 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.generate/generate_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ test()
     test2<Iter, long double>();
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -85,4 +84,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp
index 0c1cc1544..cdb126d49 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.move/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ test1()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<int*> >();
@@ -128,4 +127,6 @@ int main()
     test1<std::unique_ptr<int>*, random_access_iterator<std::unique_ptr<int>*> >();
     test1<std::unique_ptr<int>*, std::unique_ptr<int>*>();
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp
index 9b3df5af4..365c1a115 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.move/move_backward.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ test1()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
@@ -82,4 +81,6 @@ int main()
     test1<std::unique_ptr<int>*, random_access_iterator<std::unique_ptr<int>*> >();
     test1<std::unique_ptr<int>*, std::unique_ptr<int>*>();
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp
index b68b28de4..6c741490f 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.partitions/is_partitioned.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ TEST_CONSTEXPR bool test_constexpr() {
 #endif
 
 
-int main() {
+int main(int, char**) {
   {
     const int ia[] = {1, 2, 3, 4, 5, 6};
     unary_counting_predicate<is_odd, int> pred((is_odd()));
@@ -95,4 +94,6 @@ int main() {
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.partitions/partition.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.partitions/partition.pass.cpp
index ce74684f3..97af585b9 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.partitions/partition.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.partitions/partition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -94,9 +93,11 @@ test()
         assert(!is_odd()(*i));
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_copy.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_copy.pass.cpp
index 9738fef35..267136346 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_copy.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         const int ia[] = {1, 2, 3, 4, 6, 8, 5, 7};
@@ -69,4 +68,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_point.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_point.pass.cpp
index 1ea9885c1..5da1b8150 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_point.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ TEST_CONSTEXPR bool test_constexpr() {
 #endif
 
 
-int main()
+int main(int, char**)
 {
     {
         const int ia[] = {2, 4, 6, 8, 10};
@@ -90,4 +89,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp
index cf23c7743..0358f7030 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -302,7 +301,7 @@ test1()
 
 #endif  // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<std::pair<int,int>*> >();
     test<random_access_iterator<std::pair<int,int>*> >();
@@ -311,4 +310,6 @@ int main()
 #if TEST_STD_VER >= 11
     test1<bidirectional_iterator<std::unique_ptr<int>*> >();
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.fail.cpp b/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.fail.cpp
index 3d37d052c..c01104c0c 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.fail.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,9 +32,11 @@ template <class PopulationIterator, class SampleIterator> void test() {
                             SampleIterator(oa), os, g);
 }
 
-int main() {
+int main(int, char**) {
   // expected-error-re@algorithm:* {{static_assert failed{{( due to requirement '.*')?}} "SampleIterator must meet the requirements of RandomAccessIterator"}}
   // expected-error@algorithm:* 2 {{does not provide a subscript operator}}
   // expected-error@algorithm:* {{invalid operands}}
   test<input_iterator<int *>, output_iterator<int *> >();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.pass.cpp
index 0a14c6695..40f2037f0 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -137,7 +136,7 @@ void test_small_population() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test<input_iterator, int, random_access_iterator, int>();
   test<forward_iterator, int, output_iterator, int>();
   test<forward_iterator, int, random_access_iterator, int>();
@@ -157,4 +156,6 @@ int main() {
   test_small_population<input_iterator, int, random_access_iterator, int>();
   test_small_population<forward_iterator, int, output_iterator, int>();
   test_small_population<forward_iterator, int, random_access_iterator, int>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.stable.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.stable.pass.cpp
index db484238c..58e608462 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.stable.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.random.sample/sample.stable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,9 @@ void test_stability(bool expect_stable) {
   assert(expect_stable == !unstable);
 }
 
-int main() {
+int main(int, char**) {
   test_stability<forward_iterator<int *>, output_iterator<int *> >(true);
   test_stability<input_iterator<int *>, random_access_iterator<int *> >(false);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.pass.cpp
index e2abf7cce..cb83cde93 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,17 +18,44 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_iterators.h"
+
+template <class Iter>
+void
+test_with_iterator()
+{
+    int empty[] = {};
+    std::random_shuffle(Iter(empty), Iter(empty));
+
+    const int all_elements[] = {1, 2, 3, 4};
+    int           shuffled[] = {1, 2, 3, 4};
+    const unsigned size = sizeof(all_elements)/sizeof(all_elements[0]);
+
+    std::random_shuffle(Iter(shuffled), Iter(shuffled+size));
+    assert(std::is_permutation(shuffled, shuffled+size, all_elements));
+
+    std::random_shuffle(Iter(shuffled), Iter(shuffled+size));
+    assert(std::is_permutation(shuffled, shuffled+size, all_elements));
+}
+
 
-int main()
+int main(int, char**)
 {
-    int ia[] = {1, 2, 3, 4};
+    int ia[]  = {1, 2, 3, 4};
     int ia1[] = {1, 4, 3, 2};
     int ia2[] = {4, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
+
     std::random_shuffle(ia, ia+sa);
     LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));
     assert(std::is_permutation(ia, ia+sa, ia1));
+
     std::random_shuffle(ia, ia+sa);
     LIBCPP_ASSERT(std::equal(ia, ia+sa, ia2));
     assert(std::is_permutation(ia, ia+sa, ia2));
+
+    test_with_iterator<random_access_iterator<int*> >();
+    test_with_iterator<int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_rand.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_rand.pass.cpp
index 313b6bac4..dd5398dac 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_rand.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_rand.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,6 +20,8 @@
 #include <cstddef>
 
 #include "test_macros.h"
+#include "test_iterators.h"
+
 
 struct gen
 {
@@ -30,13 +31,29 @@ struct gen
     }
 };
 
-int main()
+
+template <class Iter>
+void
+test_with_iterator()
 {
+
     int ia[] = {1, 2, 3, 4};
     int ia1[] = {4, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
     gen r;
+
     std::random_shuffle(ia, ia+sa, r);
     LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));
     assert(std::is_permutation(ia, ia+sa, ia1));
+
+    std::random_shuffle(ia, ia+sa, r);
+    assert(std::is_permutation(ia, ia+sa, ia1));
+}
+
+
+int main(int, char**)
+{
+    test_with_iterator<random_access_iterator<int*> >();
+    test_with_iterator<int*>();
+    return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_urng.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_urng.pass.cpp
index 512acc392..d5f162bce 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_urng.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_urng.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     int ia[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
     int ia1[] = {2, 7, 1, 4, 3, 6, 5, 10, 9, 8};
@@ -32,4 +31,6 @@ int main()
     std::shuffle(ia, ia+sa, std::move(g));
     LIBCPP_ASSERT(std::equal(ia, ia+sa, ia2));
     assert(std::is_permutation(ia, ia+sa, ia2));
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.remove/remove.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.remove/remove.pass.cpp
index 70b3316d3..ebacec5f4 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.remove/remove.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.remove/remove.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,7 +73,7 @@ test1()
 }
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -91,4 +90,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy.pass.cpp
index 4ace1494d..8dedddb4c 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ test()
     assert(ib[5] == 4);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -86,4 +85,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy_if.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy_if.pass.cpp
index c13788690..7d10c6bd7 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy_if.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.remove/remove_copy_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ test()
     assert(ib[5] == 4);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -91,4 +90,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.remove/remove_if.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.remove/remove_if.pass.cpp
index 7a0f3405c..637a91707 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.remove/remove_if.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.remove/remove_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -89,7 +88,7 @@ test1()
 }
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -106,4 +105,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.replace/replace.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.replace/replace.pass.cpp
index 56a744b2c..1e91fc968 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.replace/replace.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.replace/replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test()
     assert(ia[4] == 4);
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -58,4 +57,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy.pass.cpp
index 32be4e5bc..da3fabf40 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ test()
     assert(ib[4] == 4);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -90,4 +89,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy_if.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy_if.pass.cpp
index 3d9a5bb73..26cbd705f 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy_if.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ test()
     assert(ib[4] == 4);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -94,4 +93,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp
index eeff40687..4f32b6e94 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.replace/replace_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ test()
     assert(ia[4] == 4);
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -61,4 +60,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse.pass.cpp
index 6c49605b6..7838a0ca2 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,9 +51,11 @@ test()
     assert(id[3] == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
index e5aa427b9..6967c446b 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.reverse/reverse_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ test()
     assert(jd[3] == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<const int*>, output_iterator<int*> >();
     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
@@ -96,4 +95,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp
index 515c79761..007faf685 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -420,7 +419,7 @@ test1()
 
 #endif  // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -435,4 +434,6 @@ int main()
     test1<std::unique_ptr<int>*>();
 
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
index e0e096a6f..d66bf8caa 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.rotate/rotate_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -129,7 +128,7 @@ test()
     assert(ib[3] == 3);
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<const int*>, output_iterator<int*> >();
     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
@@ -152,4 +151,6 @@ int main()
 // #if TEST_STD_VER > 17
 //    static_assert(test_constexpr());
 // #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.swap/iter_swap.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.swap/iter_swap.pass.cpp
index d68efd994..419bb4bbb 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.swap/iter_swap.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.swap/iter_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <algorithm>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int i = 1;
     int j = 2;
     std::iter_swap(&i, &j);
     assert(i == 2);
     assert(j == 1);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.swap/swap_ranges.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.swap/swap_ranges.pass.cpp
index 84f2c8c9f..a47bbd24d 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.swap/swap_ranges.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.swap/swap_ranges.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -106,7 +105,7 @@ void test2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*>, forward_iterator<int*> >();
     test<forward_iterator<int*>, bidirectional_iterator<int*> >();
@@ -151,4 +150,6 @@ int main()
 #endif // TEST_STD_VER >= 11
 
     test2();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.transform/binary_transform.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.transform/binary_transform.pass.cpp
index b2b894912..ca7287bf2 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.transform/binary_transform.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.transform/binary_transform.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ test()
     assert(ib[4] == 1);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, input_iterator<int*> >();
@@ -237,4 +236,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.transform/unary_transform.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.transform/unary_transform.pass.cpp
index a929291ad..85c386820 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.transform/unary_transform.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.transform/unary_transform.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ test()
     assert(ib[4] == 5);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<int*> >();
@@ -98,4 +97,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp
index dcb09a181..7046d6a2b 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.unique/unique.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -182,7 +181,7 @@ test1()
 }
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -199,4 +198,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy.pass.cpp
index 48ddcf921..ba533507c 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -106,7 +105,7 @@ test()
     assert(ji[2] == 2);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -141,4 +140,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy_pred.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy_pred.pass.cpp
index 55bfd36d5..e8ebeaead 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy_pred.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -134,7 +133,7 @@ test()
     assert(count_equal::count == si-1);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -169,4 +168,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp b/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp
index 2936a4e66..9f0c695e2 100644
--- a/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/alg.unique/unique_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -224,7 +223,7 @@ test1()
 }
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
@@ -241,4 +240,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.modifying.operations/nothing_to_do.pass.cpp b/test/std/algorithms/alg.modifying.operations/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.modifying.operations/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/alg.modifying.operations/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find.pass.cpp
index 8de06ec7b..6d57c5869 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -48,4 +47,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find_pred.pass.cpp
index bf445c54d..c80bc9fff 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.adjacent.find/adjacent_find_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -55,4 +54,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.all_of/all_of.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.all_of/all_of.pass.cpp
index 3840350a0..5c49878f6 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.all_of/all_of.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.all_of/all_of.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         int ia[] = {2, 4, 6, 8};
@@ -59,4 +58,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.any_of/any_of.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.any_of/any_of.pass.cpp
index 7c80f718f..22ae581d6 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.any_of/any_of.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.any_of/any_of.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         int ia[] = {2, 4, 6, 8};
@@ -67,4 +66,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.count/count.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.count/count.pass.cpp
index bce1095f2..d864080df 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.count/count.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.count/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -44,4 +43,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.count/count_if.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.count/count_if.pass.cpp
index ff3b6888a..978f5fcdb 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.count/count_if.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.count/count_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -54,4 +53,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
index 656c7310f..afd57491a 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.equal/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ TEST_CONSTEXPR bool test_constexpr() {
 #endif
 
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 4, 5};
     const unsigned s = sizeof(ia)/sizeof(ia[0]);
@@ -89,4 +88,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.equal/equal_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.equal/equal_pred.pass.cpp
index c6bb06baf..2b9619b73 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.equal/equal_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.equal/equal_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ bool counting_equals ( const T &a, const T &b ) {
     return a == b;
 }
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 4, 5};
     const unsigned s = sizeof(ia)/sizeof(ia[0]);
@@ -115,4 +114,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end.pass.cpp
index afcf27b55..3060528a8 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ test()
     assert(std::find_end(Iter1(ia), Iter1(ia), Iter2(b), Iter2(b+1)) == Iter1(ia));
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
@@ -78,4 +77,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end_pred.pass.cpp
index 76ac99165..7358cf5f7 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.find.end/find_end_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,6 +15,7 @@
 //   find_end(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2, Pred pred);
 
 #include <algorithm>
+#include <functional>
 #include <cassert>
 
 #include "test_macros.h"
@@ -92,7 +92,7 @@ test()
     assert(count_equal::count <= 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
@@ -107,4 +107,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of.pass.cpp
index 2212285ae..04468f741 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -70,4 +69,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of_pred.pass.cpp
index f6f1725d6..3c32aee0e 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.find.first.of/find_first_of_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ constexpr bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -76,4 +75,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.find/find.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.find/find.pass.cpp
index faff926d3..9dc265f18 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.find/find.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.find/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 4, 5};
     const unsigned s = sizeof(ia)/sizeof(ia[0]);
@@ -43,4 +42,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.find/find_if.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.find/find_if.pass.cpp
index 0fe084c01..6151a55b8 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.find/find_if.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.find/find_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 4, 5};
     const unsigned s = sizeof(ia)/sizeof(ia[0]);
@@ -54,4 +53,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.find/find_if_not.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.find/find_if_not.pass.cpp
index 971a94dce..36a754269 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.find/find_if_not.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.find/find_if_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 4, 5};
     const unsigned s = sizeof(ia)/sizeof(ia[0]);
@@ -54,4 +53,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
index 6c6824faf..f4dcd2d57 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct for_each_test
     void operator()(int& i) {++i; ++count;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef input_iterator<int*> Iter;
     int ia[] = {0, 1, 2, 3, 4, 5};
@@ -77,4 +76,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.foreach/test.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.foreach/test.pass.cpp
index a334c6093..4d129e755 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.foreach/test.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.foreach/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct for_each_test
     void operator()(int& i) {++i; ++count;}
 };
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 3, 4, 5};
     const unsigned s = sizeof(ia)/sizeof(ia[0]);
@@ -52,4 +51,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation.pass.cpp
index 52ad7befc..2a2c796ca 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         const int ia[] = {0};
@@ -619,4 +618,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation_pred.pass.cpp
index cbf87c6c2..ea4270ec4 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.is_permutation/is_permutation_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ struct eq {
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         const int ia[] = {0};
@@ -770,4 +769,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.none_of/none_of.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.none_of/none_of.pass.cpp
index 356c2fbb8..f3a4fea90 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.none_of/none_of.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.none_of/none_of.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         int ia[] = {2, 4, 6, 8};
@@ -67,4 +66,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.search/search.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.search/search.pass.cpp
index d483800c2..5aaa832de 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.search/search.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.search/search.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -96,7 +95,7 @@ test()
     assert(std::search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk)) == Iter1(ij+6));
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
@@ -122,4 +121,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.search/search_n.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.search/search_n.pass.cpp
index 528ec5696..3c86127f3 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.search/search_n.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.search/search_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -80,7 +79,7 @@ test()
     (void)std::search_n(Iter(ic), Iter(ic+sc), UserDefinedIntegral<unsigned>(0), 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -89,4 +88,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.search/search_n_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.search/search_n_pred.pass.cpp
index d5780c7e7..135689390 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.search/search_n_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.search/search_n_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -159,7 +158,7 @@ test()
     count_equal::count = 0;
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -168,4 +167,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp
index 21a17116f..f835d2f09 100644
--- a/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/alg.search/search_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -111,7 +110,7 @@ test()
     assert(count_equal::count <= sh*3);
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
@@ -126,4 +125,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp b/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp
index 4b5ddb191..72281b47f 100644
--- a/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/mismatch/mismatch.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ TEST_CONSTEXPR bool test_constexpr() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -90,4 +89,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp b/test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp
index ed9ba055a..15edec03a 100644
--- a/test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,7 +68,7 @@ TEST_CONSTEXPR bool test_constexpr() {
 #define HAS_FOUR_ITERATOR_VERSION
 #endif
 
-int main()
+int main(int, char**)
 {
     int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
@@ -115,4 +114,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.nonmodifying/nothing_to_do.pass.cpp b/test/std/algorithms/alg.nonmodifying/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.nonmodifying/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/alg.nonmodifying/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search.pass.cpp
index 04c4c258b..3d04d5161 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ test()
     test(Iter(v.data()), Iter(v.data()+v.size()), M, false);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {0, 2, 4, 6};
     for (int* e = d; e <= d+4; ++e)
@@ -77,4 +76,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search_comp.pass.cpp
index b27861022..a447853d2 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/binary.search/binary_search_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ test()
     test(Iter(v.data()), Iter(v.data()+v.size()), M, false);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {6, 4, 2, 0};
     for (int* e = d; e <= d+4; ++e)
@@ -78,4 +77,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range.pass.cpp
index 02aea475c..e22bd5ad2 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,7 @@ test()
         test(Iter(v.data()), Iter(v.data()+v.size()), x);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {0, 1, 2, 3};
     for (int* e = d; e <= d+4; ++e)
@@ -85,4 +84,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range_comp.pass.cpp
index 960e2c1fa..ab36e7033 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/equal.range/equal_range_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,7 +68,7 @@ test()
         test(Iter(v.data()), Iter(v.data()+v.size()), x);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {3, 2, 1, 0};
     for (int* e = d; e <= d+4; ++e)
@@ -84,4 +83,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound.pass.cpp
index b6848ec9e..ce9b71c06 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ test()
         test(Iter(v.data()), Iter(v.data()+v.size()), x);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {0, 1, 2, 3};
     for (int* e = d; e <= d+4; ++e)
@@ -80,4 +79,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound_comp.pass.cpp
index b3ef70eb0..b9133028d 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/lower.bound/lower_bound_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ test()
         test(Iter(v.data()), Iter(v.data()+v.size()), x);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {3, 2, 1, 0};
     for (int* e = d; e <= d+4; ++e)
@@ -80,4 +79,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/nothing_to_do.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound.pass.cpp
index 43bb4c3cc..1f9babde5 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ test()
         test(Iter(v.data()), Iter(v.data()+v.size()), x);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {0, 1, 2, 3};
     for (int* e = d; e <= d+4; ++e)
@@ -77,4 +76,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound_comp.pass.cpp
index fa8e934b9..86066a620 100644
--- a/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.binary.search/upper.bound/upper_bound_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ test()
         test(Iter(v.data()), Iter(v.data()+v.size()), x);
 }
 
-int main()
+int main(int, char**)
 {
     int d[] = {3, 2, 1, 0};
     for (int* e = d; e <= d+4; ++e)
@@ -80,4 +79,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.clamp/clamp.comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.clamp/clamp.comp.pass.cpp
index 50bcff9c9..482af9ef3 100644
--- a/test/std/algorithms/alg.sorting/alg.clamp/clamp.comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.clamp/clamp.comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ test(const T& v, const T& lo, const T& hi, C c, const T& x)
     assert(&std::clamp(v, lo, hi, c) == &x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -124,4 +123,6 @@ int main()
     static_assert(std::clamp(x, y, z, std::greater<T>()) == y, "" );
     static_assert(std::clamp(y, x, z, std::greater<T>()) == y, "" );
     }
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.clamp/clamp.pass.cpp b/test/std/algorithms/alg.sorting/alg.clamp/clamp.pass.cpp
index 7d734144d..4066a3945 100644
--- a/test/std/algorithms/alg.sorting/alg.clamp/clamp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.clamp/clamp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ test(const T& a, const T& lo, const T& hi, const T& x)
     assert(&std::clamp(a, lo, hi) == &x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -122,4 +121,6 @@ int main()
     static_assert(std::clamp(x, y, z) == x, "" );
     static_assert(std::clamp(y, x, z) == x, "" );
     }
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap.pass.cpp
index c3d6fd919..14b1d1754 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -526,11 +525,13 @@ void test()
     assert(std::is_heap(i246, i246+7) == (std::is_heap_until(i246, i246+7) == i246+7));
 }
 
-int main()
+int main(int, char**)
 {
     test();
 
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_comp.pass.cpp
index 3f290bb29..9e3445882 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -527,11 +526,13 @@ void test()
     assert(std::is_heap(i246, i246+7, std::greater<int>()) == (std::is_heap_until(i246, i246+7, std::greater<int>()) == i246+7));
 }
 
-int main()
+int main(int, char**)
 {
     test();
 
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until.pass.cpp
index 96369eb60..b9bb3e1f5 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -526,11 +525,13 @@ void test()
     assert(std::is_heap_until(i246, i246+7) == i246+7);
 }
 
-int main()
+int main(int, char**)
 {
     test();
 
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until_comp.pass.cpp
index edd27b0d7..6002f662e 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/is.heap/is_heap_until_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -527,11 +526,13 @@ void test()
     assert(std::is_heap_until(i246, i246+7, std::greater<int>()) == i246+6);
 }
 
-int main()
+int main(int, char**)
 {
     test();
 
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap.pass.cpp
index 082cad5f2..3d862ca4f 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(0);
     test(1);
@@ -39,4 +38,6 @@ int main()
     test(3);
     test(10);
     test(1000);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap_comp.pass.cpp
index 01183d16c..0650f7454 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/make.heap/make_heap_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(0);
     test(1);
@@ -98,4 +97,6 @@ int main()
     delete [] ia;
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/nothing_to_do.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap.pass.cpp
index 8ba0f7194..2b434983c 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,9 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(1000);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap_comp.pass.cpp
index 33b8ff9ae..63bd1520f 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/pop.heap/pop_heap_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(1000);
 
@@ -68,4 +67,6 @@ int main()
     delete [] ia;
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap.pass.cpp
index 38d7a425d..7db79e3bc 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,9 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(1000);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap_comp.pass.cpp
index 1b1987aa9..4a47f65bf 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/push.heap/push_heap_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(1000);
 
@@ -65,4 +64,6 @@ int main()
     delete [] ia;
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap.pass.cpp
index 003138099..947affcf0 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(0);
     test(1);
@@ -40,4 +39,6 @@ int main()
     test(3);
     test(10);
     test(1000);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap_comp.pass.cpp
index 02839abab..151373b71 100644
--- a/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.heap.operations/sort.heap/sort_heap_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ void test(int N)
     delete [] ia;
 }
 
-int main()
+int main(int, char**)
 {
     test(0);
     test(1);
@@ -65,4 +64,6 @@ int main()
     delete [] ia;
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare.pass.cpp b/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare.pass.cpp
index adec6aec8..f421bfcb8 100644
--- a/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ test()
     assert(!std::lexicographical_compare(Iter1(ib+1), Iter1(ib+3),  Iter2(ia),   Iter2(ia+sa)));
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*> >();
     test<input_iterator<const int*>, forward_iterator<const int*> >();
@@ -82,4 +81,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare_comp.pass.cpp
index b7fbdbfa2..b0e0ee7d7 100644
--- a/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ test()
     assert( std::lexicographical_compare(Iter1(ib+1), Iter1(ib+3),  Iter2(ia),   Iter2(ia+sa), c));
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*> >();
     test<input_iterator<const int*>, forward_iterator<const int*> >();
@@ -87,4 +86,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.merge/inplace_merge.pass.cpp b/test/std/algorithms/alg.sorting/alg.merge/inplace_merge.pass.cpp
index 3743fa535..208221416 100644
--- a/test/std/algorithms/alg.sorting/alg.merge/inplace_merge.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.merge/inplace_merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -97,7 +96,7 @@ test()
     test<Iter>(1000);
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
@@ -108,4 +107,6 @@ int main()
     test<random_access_iterator<S*> >();
     test<S*>();
 #endif  // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.merge/inplace_merge_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.merge/inplace_merge_comp.pass.cpp
index 992862a4e..7ab5c0ca9 100644
--- a/test/std/algorithms/alg.sorting/alg.merge/inplace_merge_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.merge/inplace_merge_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -136,7 +135,7 @@ void test_PR31166 ()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
@@ -168,4 +167,6 @@ int main()
 #endif  // TEST_STD_VER >= 11
 
     test_PR31166();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp b/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp
index a42936124..6c6f0c46d 100644
--- a/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.merge/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -90,7 +89,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -246,4 +245,6 @@ int main()
 //  Not yet - waiting on std::copy
 //     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp
index 1506a8cd5..508a4f5ab 100644
--- a/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.merge/merge_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -101,7 +100,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -257,4 +256,6 @@ int main()
 //  Not yet - waiting on std::copy
 //     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/max.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/max.pass.cpp
index f453a234d..f52c72b14 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/max.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const T& a, const T& b, const T& x)
     assert(&std::max(a, b) == &x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -53,4 +52,6 @@ int main()
     static_assert(std::max(y, x) == x, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/max_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/max_comp.pass.cpp
index 6c185c2a8..e554b3cd0 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/max_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/max_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const T& a, const T& b, C c, const T& x)
     assert(&std::max(a, b, c) == &x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -55,4 +54,6 @@ int main()
     static_assert(std::max(y, x, std::greater<int>()) == y, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/max_element.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/max_element.pass.cpp
index 471b08cc6..cb5341ca0 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/max_element.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/max_element.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ void constexpr_test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -80,4 +79,6 @@ int main()
     test<const int*>();
 
     constexpr_test ();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/max_element_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/max_element_comp.pass.cpp
index 95c7dee2c..fbcea97b6 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/max_element_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/max_element_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ void constexpr_test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -101,4 +100,6 @@ int main()
     test_eq();
 
     constexpr_test();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/max_init_list.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/max_init_list.pass.cpp
index e003acaa5..ff58ba479 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/max_init_list.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/max_init_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     int i = std::max({2, 3, 1});
     assert(i == 3);
@@ -41,4 +40,6 @@ int main()
     static_assert(std::max({3, 2, 1}) == 3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/max_init_list_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/max_init_list_comp.pass.cpp
index 6b3c72b1d..4042f48af 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/max_init_list_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/max_init_list_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     int i = std::max({2, 3, 1}, std::greater<int>());
     assert(i == 1);
@@ -42,4 +41,6 @@ int main()
     static_assert(std::max({3, 2, 1}, std::greater<int>()) == 1, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/min.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/min.pass.cpp
index 3d0241f80..533077a55 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/min.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const T& a, const T& b, const T& x)
     assert(&std::min(a, b) == &x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -53,4 +52,6 @@ int main()
     static_assert(std::min(y, x) == y, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/min_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/min_comp.pass.cpp
index 9dc743802..4524fe47b 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/min_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/min_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const T& a, const T& b, C c, const T& x)
     assert(&std::min(a, b, c) == &x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -55,4 +54,6 @@ int main()
     static_assert(std::min(y, x, std::greater<int>()) == x, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/min_element.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/min_element.pass.cpp
index 7cd41eaea..151bfa812 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/min_element.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/min_element.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ void constexpr_test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -80,4 +79,6 @@ int main()
     test<const int*>();
 
     constexpr_test();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/min_element_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/min_element_comp.pass.cpp
index da76d2a36..cada8b346 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/min_element_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/min_element_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ void constexpr_test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -101,4 +100,6 @@ int main()
     test_eq();
 
     constexpr_test();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/min_init_list.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/min_init_list.pass.cpp
index d212bf6cf..1253e1a6f 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/min_init_list.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/min_init_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     int i = std::min({2, 3, 1});
     assert(i == 1);
@@ -41,4 +40,6 @@ int main()
     static_assert(std::min({3, 2, 1}) == 1, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/min_init_list_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/min_init_list_comp.pass.cpp
index 7435da166..b0bd5d492 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/min_init_list_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/min_init_list_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     int i = std::min({2, 3, 1}, std::greater<int>());
     assert(i == 3);
@@ -42,4 +41,6 @@ int main()
     static_assert(std::min({3, 2, 1}, std::greater<int>()) == 3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/minmax.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/minmax.pass.cpp
index 6ef4d0646..0dffd5274 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/minmax.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/minmax.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const T& a, const T& b, const T& x, const T& y)
     assert(&p.second == &y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -61,4 +60,6 @@ int main()
     static_assert(p2.second == x, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp
index a2027d440..38ee5a96e 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(const T& a, const T& b, C c, const T& x, const T& y)
 }
 
 
-int main()
+int main(int, char**)
 {
     {
     int x = 0;
@@ -64,4 +63,6 @@ int main()
     static_assert(p2.second == y, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/minmax_element.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/minmax_element.pass.cpp
index acede6ff7..8b56ac180 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/minmax_element.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/minmax_element.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -90,7 +89,7 @@ void constexpr_test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -98,4 +97,6 @@ int main()
     test<const int*>();
 
    constexpr_test();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/minmax_element_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/minmax_element_comp.pass.cpp
index ff83d7e55..3ecc02ce1 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/minmax_element_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/minmax_element_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -97,7 +96,7 @@ void constexpr_test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -105,4 +104,6 @@ int main()
     test<const int*>();
 
     constexpr_test();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list.pass.cpp
index dd62dfd78..e02b9fb38 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert((std::minmax({1, 2, 3}) == std::pair<int, int>(1, 3)));
     assert((std::minmax({1, 3, 2}) == std::pair<int, int>(1, 3)));
@@ -38,4 +37,6 @@ int main()
     static_assert((std::minmax({3, 2, 1}) == std::pair<int, int>(1, 3)), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list_comp.pass.cpp
index ab20b2a04..efa0e92fb 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/minmax_init_list_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test_all_equal(std::initializer_list<int> il)
     assert(pred.count() <= ((3 * il.size()) / 2));
 }
 
-int main()
+int main(int, char**)
 {
     assert((std::minmax({1, 2, 3}, std::greater<int>()) == std::pair<int, int>(3, 1)));
     assert((std::minmax({1, 3, 2}, std::greater<int>()) == std::pair<int, int>(3, 1)));
@@ -73,4 +72,6 @@ int main()
     static_assert((std::minmax({3, 2, 1}, std::greater<int>()) == std::pair<int, int>(3, 1)), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.min.max/requires_forward_iterator.fail.cpp b/test/std/algorithms/alg.sorting/alg.min.max/requires_forward_iterator.fail.cpp
index a1069dee7..e04850175 100644
--- a/test/std/algorithms/alg.sorting/alg.min.max/requires_forward_iterator.fail.cpp
+++ b/test/std/algorithms/alg.sorting/alg.min.max/requires_forward_iterator.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_iterators.h"
 
-int main() {
+int main(int, char**) {
   int arr[] = {1, 2, 3};
   const int *b = std::begin(arr), *e = std::end(arr);
   typedef input_iterator<const int*> Iter;
@@ -34,4 +33,6 @@ int main() {
     std::minmax_element(Iter(b), Iter(e));
   }
 
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.nth.element/nth_element.pass.cpp b/test/std/algorithms/alg.sorting/alg.nth.element/nth_element.pass.cpp
index b43d88fe0..abde620d0 100644
--- a/test/std/algorithms/alg.sorting/alg.nth.element/nth_element.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.nth.element/nth_element.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ test(int N)
     test_one(N, N-1);
 }
 
-int main()
+int main(int, char**)
 {
     int d = 0;
     std::nth_element(&d, &d, &d);
@@ -63,4 +62,6 @@ int main()
     test(997);
     test(1000);
     test(1009);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.nth.element/nth_element_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.nth.element/nth_element_comp.pass.cpp
index fa30797bd..980b2b988 100644
--- a/test/std/algorithms/alg.sorting/alg.nth.element/nth_element_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.nth.element/nth_element_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ test(int N)
     test_one(N, N-1);
 }
 
-int main()
+int main(int, char**)
 {
     int d = 0;
     std::nth_element(&d, &d, &d);
@@ -86,4 +85,6 @@ int main()
     assert(static_cast<std::size_t>(*v[v.size()/2]) == v.size()/2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation.pass.cpp b/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation.pass.cpp
index fb58c718c..62d5b42e2 100644
--- a/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,9 +57,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation_comp.pass.cpp
index 8e87e9a43..4416ed1e4 100644
--- a/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.permutation.generators/next_permutation_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,9 +59,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation.pass.cpp b/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation.pass.cpp
index d2fa2cb98..044a6444a 100644
--- a/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,9 +57,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation_comp.pass.cpp
index 51b7aa8c1..760daae36 100644
--- a/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.permutation.generators/prev_permutation_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,9 +59,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes.pass.cpp
index ca1b42251..f8e888408 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ test()
     assert(!std::includes(Iter1(ia), Iter1(ia+sa), Iter2(id), Iter2(id+4)));
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*> >();
     test<input_iterator<const int*>, forward_iterator<const int*> >();
@@ -98,4 +97,6 @@ int main()
 #if TEST_STD_VER > 17
    static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes_comp.pass.cpp
index 06192f93b..48bafcb3a 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/includes/includes_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ test()
     assert(!std::includes(Iter1(ia), Iter1(ia+sa), Iter2(id), Iter2(id+4), std::less<int>()));
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*> >();
     test<input_iterator<const int*>, forward_iterator<const int*> >();
@@ -101,4 +100,6 @@ int main()
 #if TEST_STD_VER > 17
    static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/nothing_to_do.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp
index c2c20c295..4d1f537b7 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), irr, irr+srr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -197,4 +196,6 @@ int main()
     test<const int*, const int*, bidirectional_iterator<int*> >();
     test<const int*, const int*, random_access_iterator<int*> >();
     test<const int*, const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp
index 2b5a6a9f5..2597174c6 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.difference/set_difference_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), irr, irr+srr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -199,4 +198,6 @@ int main()
     test<const int*, const int*, bidirectional_iterator<int*> >();
     test<const int*, const int*, random_access_iterator<int*> >();
     test<const int*, const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection.pass.cpp
index 8d18027ee..08e08f672 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), ir, ir+sr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -218,4 +217,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection_comp.pass.cpp
index 6b0cfe168..acdd7b019 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.intersection/set_intersection_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), ir, ir+sr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -221,4 +220,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp
index ea3812a7f..c74d6623b 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), ir, ir+sr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -196,4 +195,6 @@ int main()
     test<const int*, const int*, bidirectional_iterator<int*> >();
     test<const int*, const int*, random_access_iterator<int*> >();
     test<const int*, const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp
index ba1f61a10..99e75b122 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.symmetric.difference/set_symmetric_difference_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), ir, ir+sr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -200,4 +199,6 @@ int main()
     test<const int*, const int*, bidirectional_iterator<int*> >();
     test<const int*, const int*, random_access_iterator<int*> >();
     test<const int*, const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp
index 46578501d..827c2c190 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), ir, ir+sr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -195,4 +194,6 @@ int main()
     test<const int*, const int*, bidirectional_iterator<int*> >();
     test<const int*, const int*, random_access_iterator<int*> >();
     test<const int*, const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp
index 3d63e3fb9..c8d1d2882 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ test()
     assert(std::lexicographical_compare(ic, base(ce), ir, ir+sr) == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, input_iterator<const int*>, forward_iterator<int*> >();
@@ -197,4 +196,6 @@ int main()
     test<const int*, const int*, bidirectional_iterator<int*> >();
     test<const int*, const int*, random_access_iterator<int*> >();
     test<const int*, const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_move.pass.cpp b/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_move.pass.cpp
index 078060176..45bd455bb 100644
--- a/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_move.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.set.operations/set.union/set_union_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "MoveOnly.h"
 
 
-int main()
+int main(int, char**)
 {
     std::vector<MoveOnly> lhs, rhs;
     lhs.push_back(MoveOnly(2));
@@ -43,4 +42,6 @@ int main()
 
     assert(res.size() == 1);
     assert(res[0].get() == 2);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted.pass.cpp
index 3652c089c..6e2ea5f3a 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -183,7 +182,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -193,4 +192,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_comp.pass.cpp
index 228aacac6..c5624d994 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -184,7 +183,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -194,4 +193,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until.pass.cpp
index b2ed76f51..4396a4fc8 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -183,7 +182,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -193,4 +192,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until_comp.pass.cpp
index 76724bc39..48696cf08 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/is.sorted/is_sorted_until_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -184,7 +183,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
@@ -194,4 +193,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/nothing_to_do.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy.pass.cpp
index d0b41cca3..45a6fef67 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,7 +75,7 @@ test()
     test_larger_sorts<Iter>(1009);
 }
 
-int main()
+int main(int, char**)
 {
     int i = 0;
     std::partial_sort_copy(&i, &i, &i, &i+5);
@@ -86,4 +85,6 @@ int main()
     test<bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*> >();
     test<const int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy_comp.pass.cpp
index 0ac2a86af..a1c2b0f9c 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/partial.sort.copy/partial_sort_copy_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -80,7 +79,7 @@ test()
     test_larger_sorts<Iter>(1009);
 }
 
-int main()
+int main(int, char**)
 {
     int i = 0;
     std::partial_sort_copy(&i, &i, &i, &i+5);
@@ -90,4 +89,6 @@ int main()
     test<bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*> >();
     test<const int*>();
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort.pass.cpp
index 05a06a9c3..b41eb12d6 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ test_larger_sorts(int N)
     test_larger_sorts(N, N);
 }
 
-int main()
+int main(int, char**)
 {
     int i = 0;
     std::partial_sort(&i, &i, &i);
@@ -67,4 +66,6 @@ int main()
     test_larger_sorts(997);
     test_larger_sorts(1000);
     test_larger_sorts(1009);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort_comp.pass.cpp
index fb7976713..f50d04005 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/partial.sort/partial_sort_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ test_larger_sorts(int N)
     test_larger_sorts(N, N);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int i = 0;
@@ -93,4 +92,6 @@ int main()
         assert(*v[i] == i);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/sort/sort.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/sort/sort.pass.cpp
index 6149a574b..8f2845732 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/sort/sort.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/sort/sort.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -131,7 +130,7 @@ test_larger_sorts(int N)
     test_larger_sorts(N, N);
 }
 
-int main()
+int main(int, char**)
 {
     // test null range
     int d = 0;
@@ -153,4 +152,6 @@ int main()
     test_larger_sorts(997);
     test_larger_sorts(1000);
     test_larger_sorts(1009);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/sort/sort_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/sort/sort_comp.pass.cpp
index 87d66c472..832d190ce 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/sort/sort_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/sort/sort_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct indirect_less
         {return *x < *y;}
 };
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<int> v(1000);
@@ -54,4 +53,6 @@ int main()
     assert(*v[2] == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort.pass.cpp
index 994d3a8c4..c433baab4 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -131,7 +130,7 @@ test_larger_sorts(int N)
     test_larger_sorts(N, N);
 }
 
-int main()
+int main(int, char**)
 {
     // test null range
     int d = 0;
@@ -153,4 +152,6 @@ int main()
     test_larger_sorts(997);
     test_larger_sorts(1000);
     test_larger_sorts(1009);
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp b/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp
index 8306cc3b1..8da2b964b 100644
--- a/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp
+++ b/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ void test()
     assert(std::is_sorted(v.begin(), v.end()));
 }
 
-int main()
+int main(int, char**)
 {
     test();
 
@@ -83,4 +82,6 @@ int main()
     assert(*v[2] == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/algorithms/alg.sorting/nothing_to_do.pass.cpp b/test/std/algorithms/alg.sorting/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/alg.sorting/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/alg.sorting/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/algorithms/algorithms.general/nothing_to_do.pass.cpp b/test/std/algorithms/algorithms.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/algorithms/algorithms.general/nothing_to_do.pass.cpp
+++ b/test/std/algorithms/algorithms.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.fences/atomic_signal_fence.pass.cpp b/test/std/atomics/atomics.fences/atomic_signal_fence.pass.cpp
index aec060c4d..bf5325940 100644
--- a/test/std/atomics/atomics.fences/atomic_signal_fence.pass.cpp
+++ b/test/std/atomics/atomics.fences/atomic_signal_fence.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -15,7 +14,9 @@
 
 #include <atomic>
 
-int main()
+int main(int, char**)
 {
     std::atomic_signal_fence(std::memory_order_seq_cst);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.fences/atomic_thread_fence.pass.cpp b/test/std/atomics/atomics.fences/atomic_thread_fence.pass.cpp
index 4f3b0e330..d237f2de1 100644
--- a/test/std/atomics/atomics.fences/atomic_thread_fence.pass.cpp
+++ b/test/std/atomics/atomics.fences/atomic_thread_fence.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -15,7 +14,9 @@
 
 #include <atomic>
 
-int main()
+int main(int, char**)
 {
     std::atomic_thread_fence(std::memory_order_seq_cst);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/atomic_flag_clear.pass.cpp b/test/std/atomics/atomics.flag/atomic_flag_clear.pass.cpp
index 22bbbd6af..23cb3d2b6 100644
--- a/test/std/atomics/atomics.flag/atomic_flag_clear.pass.cpp
+++ b/test/std/atomics/atomics.flag/atomic_flag_clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::atomic_flag f;
@@ -35,4 +34,6 @@ int main()
         atomic_flag_clear(&f);
         assert(f.test_and_set() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/atomic_flag_clear_explicit.pass.cpp b/test/std/atomics/atomics.flag/atomic_flag_clear_explicit.pass.cpp
index 1a212c6f3..d87291297 100644
--- a/test/std/atomics/atomics.flag/atomic_flag_clear_explicit.pass.cpp
+++ b/test/std/atomics/atomics.flag/atomic_flag_clear_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::atomic_flag f; // uninitialized first
@@ -63,4 +62,6 @@ int main()
         atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
         assert(f.test_and_set() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/atomic_flag_test_and_set.pass.cpp b/test/std/atomics/atomics.flag/atomic_flag_test_and_set.pass.cpp
index ae82df919..d73dc316d 100644
--- a/test/std/atomics/atomics.flag/atomic_flag_test_and_set.pass.cpp
+++ b/test/std/atomics/atomics.flag/atomic_flag_test_and_set.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::atomic_flag f;
@@ -33,4 +32,6 @@ int main()
         assert(atomic_flag_test_and_set(&f) == 0);
         assert(f.test_and_set() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/atomic_flag_test_and_set_explicit.pass.cpp b/test/std/atomics/atomics.flag/atomic_flag_test_and_set_explicit.pass.cpp
index 154850697..972a6e84b 100644
--- a/test/std/atomics/atomics.flag/atomic_flag_test_and_set_explicit.pass.cpp
+++ b/test/std/atomics/atomics.flag/atomic_flag_test_and_set_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::atomic_flag f;
@@ -93,4 +92,6 @@ int main()
         assert(atomic_flag_test_and_set_explicit(&f, std::memory_order_seq_cst) == 0);
         assert(f.test_and_set() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/clear.pass.cpp b/test/std/atomics/atomics.flag/clear.pass.cpp
index 255af8f17..33378e4bd 100644
--- a/test/std/atomics/atomics.flag/clear.pass.cpp
+++ b/test/std/atomics/atomics.flag/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::atomic_flag f; // uninitialized
@@ -77,4 +76,6 @@ int main()
         f.clear(std::memory_order_seq_cst);
         assert(f.test_and_set() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/copy_assign.fail.cpp b/test/std/atomics/atomics.flag/copy_assign.fail.cpp
index 762e3a895..aa5a24b9e 100644
--- a/test/std/atomics/atomics.flag/copy_assign.fail.cpp
+++ b/test/std/atomics/atomics.flag/copy_assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::atomic_flag f0;
     std::atomic_flag f;
     f = f0;
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/copy_ctor.fail.cpp b/test/std/atomics/atomics.flag/copy_ctor.fail.cpp
index 8d6a86537..10deaf125 100644
--- a/test/std/atomics/atomics.flag/copy_ctor.fail.cpp
+++ b/test/std/atomics/atomics.flag/copy_ctor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::atomic_flag f0;
     std::atomic_flag f(f0);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/copy_volatile_assign.fail.cpp b/test/std/atomics/atomics.flag/copy_volatile_assign.fail.cpp
index c58c75554..a453fab28 100644
--- a/test/std/atomics/atomics.flag/copy_volatile_assign.fail.cpp
+++ b/test/std/atomics/atomics.flag/copy_volatile_assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::atomic_flag f0;
     volatile std::atomic_flag f;
     f = f0;
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/default.pass.cpp b/test/std/atomics/atomics.flag/default.pass.cpp
index b4c2b9c80..6a0d907fd 100644
--- a/test/std/atomics/atomics.flag/default.pass.cpp
+++ b/test/std/atomics/atomics.flag/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::atomic_flag f;
     f.clear();
@@ -33,4 +32,6 @@ int main()
         assert(!zero.test_and_set());
         zero.~A();
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/init.pass.cpp b/test/std/atomics/atomics.flag/init.pass.cpp
index c4a121b09..a45784d80 100644
--- a/test/std/atomics/atomics.flag/init.pass.cpp
+++ b/test/std/atomics/atomics.flag/init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,8 +18,10 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::atomic_flag f = ATOMIC_FLAG_INIT;
     assert(f.test_and_set() == 0);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.flag/test_and_set.pass.cpp b/test/std/atomics/atomics.flag/test_and_set.pass.cpp
index 210ba2050..1a198c1be 100644
--- a/test/std/atomics/atomics.flag/test_and_set.pass.cpp
+++ b/test/std/atomics/atomics.flag/test_and_set.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::atomic_flag f;
@@ -105,4 +104,6 @@ int main()
         assert(f.test_and_set(std::memory_order_seq_cst) == 0);
         assert(f.test_and_set(std::memory_order_seq_cst) == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.general/nothing_to_do.pass.cpp b/test/std/atomics/atomics.general/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/atomics/atomics.general/nothing_to_do.pass.cpp
+++ b/test/std/atomics/atomics.general/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.general/replace_failure_order.pass.cpp b/test/std/atomics/atomics.general/replace_failure_order.pass.cpp
index cd0683d68..ee2384138 100644
--- a/test/std/atomics/atomics.general/replace_failure_order.pass.cpp
+++ b/test/std/atomics/atomics.general/replace_failure_order.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include <atomic>
 
-int main() {
+int main(int, char**) {
     std::atomic<int> i;
     volatile std::atomic<int> v;
     int exp = 0;
diff --git a/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp b/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp
index 7a8d4c1f4..d2ce1cefd 100644
--- a/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp
+++ b/test/std/atomics/atomics.lockfree/isalwayslockfree.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -59,7 +58,7 @@ void checkLongLongTypes() {
   static_assert((0 != ATOMIC_LLONG_LOCK_FREE) == ExpectLockFree, "");
 }
 
-int main()
+void run()
 {
 // structs and unions can't be defined in the template invocation.
 // Work around this with a typedef.
@@ -134,3 +133,5 @@ int main()
     static_assert(std::atomic<void*>::is_always_lock_free == (2 == ATOMIC_POINTER_LOCK_FREE));
     static_assert(std::atomic<std::nullptr_t>::is_always_lock_free == (2 == ATOMIC_POINTER_LOCK_FREE));
 }
+
+int main(int, char**) { run(); return 0; }
diff --git a/test/std/atomics/atomics.lockfree/lockfree.pass.cpp b/test/std/atomics/atomics.lockfree/lockfree.pass.cpp
index 0ace9cfe7..b86893e0b 100644
--- a/test/std/atomics/atomics.lockfree/lockfree.pass.cpp
+++ b/test/std/atomics/atomics.lockfree/lockfree.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -25,7 +24,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(ATOMIC_BOOL_LOCK_FREE == 0 ||
            ATOMIC_BOOL_LOCK_FREE == 1 ||
@@ -57,4 +56,6 @@ int main()
     assert(ATOMIC_POINTER_LOCK_FREE == 0 ||
            ATOMIC_POINTER_LOCK_FREE == 1 ||
            ATOMIC_POINTER_LOCK_FREE == 2);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.order/kill_dependency.pass.cpp b/test/std/atomics/atomics.order/kill_dependency.pass.cpp
index 0f0bafcbb..998b0cef3 100644
--- a/test/std/atomics/atomics.order/kill_dependency.pass.cpp
+++ b/test/std/atomics/atomics.order/kill_dependency.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,8 +15,10 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::kill_dependency(5) == 5);
     assert(std::kill_dependency(-5.5) == -5.5);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.order/memory_order.pass.cpp b/test/std/atomics/atomics.order/memory_order.pass.cpp
index e734a4c75..973f58583 100644
--- a/test/std/atomics/atomics.order/memory_order.pass.cpp
+++ b/test/std/atomics/atomics.order/memory_order.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <atomic>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::memory_order_relaxed == 0);
     assert(std::memory_order_consume == 1);
@@ -30,4 +29,6 @@ int main()
     assert(std::memory_order_seq_cst == 5);
     std::memory_order o = std::memory_order_seq_cst;
     assert(o == 5);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.syn/nothing_to_do.pass.cpp b/test/std/atomics/atomics.syn/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/atomics/atomics.syn/nothing_to_do.pass.cpp
+++ b/test/std/atomics/atomics.syn/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.generic/address.pass.cpp b/test/std/atomics/atomics.types.generic/address.pass.cpp
index c31a99c9b..598889736 100644
--- a/test/std/atomics/atomics.types.generic/address.pass.cpp
+++ b/test/std/atomics/atomics.types.generic/address.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -137,7 +136,9 @@ void test()
     do_test<volatile A, T>();
 }
 
-int main()
+int main(int, char**)
 {
     test<std::atomic<int*>, int*>();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.generic/bool.pass.cpp b/test/std/atomics/atomics.types.generic/bool.pass.cpp
index ba38154ed..154d0bfe6 100644
--- a/test/std/atomics/atomics.types.generic/bool.pass.cpp
+++ b/test/std/atomics/atomics.types.generic/bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -59,7 +58,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         volatile std::atomic<bool> obj(true);
@@ -233,4 +232,6 @@ int main()
         assert(zero == false);
         zero.~A();
     }
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.generic/cstdint_typedefs.pass.cpp b/test/std/atomics/atomics.types.generic/cstdint_typedefs.pass.cpp
index 714fbdc39..a0648ff9c 100644
--- a/test/std/atomics/atomics.types.generic/cstdint_typedefs.pass.cpp
+++ b/test/std/atomics/atomics.types.generic/cstdint_typedefs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@
 #include <type_traits>
 #include <cstdint>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::atomic<  std::int_least8_t>,   std::atomic_int_least8_t>::value), "");
     static_assert((std::is_same<std::atomic< std::uint_least8_t>,  std::atomic_uint_least8_t>::value), "");
@@ -66,4 +65,6 @@ int main()
     static_assert((std::is_same<std::atomic<std::ptrdiff_t>, std::atomic_ptrdiff_t>::value), "");
     static_assert((std::is_same<std::atomic< std::intmax_t>,  std::atomic_intmax_t>::value), "");
     static_assert((std::is_same<std::atomic<std::uintmax_t>, std::atomic_uintmax_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.generic/integral.pass.cpp b/test/std/atomics/atomics.types.generic/integral.pass.cpp
index 74b8c60a3..62ef06bcc 100644
--- a/test/std/atomics/atomics.types.generic/integral.pass.cpp
+++ b/test/std/atomics/atomics.types.generic/integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -168,7 +167,7 @@ void test()
 }
 
 
-int main()
+int main(int, char**)
 {
     test<std::atomic_char, char>();
     test<std::atomic_schar, signed char>();
@@ -221,4 +220,6 @@ int main()
     test<volatile std::atomic_uint32_t, uint32_t>();
     test<volatile std::atomic_int64_t,   int64_t>();
     test<volatile std::atomic_uint64_t, uint64_t>();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp b/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp
index e4deae1bf..faa682b8c 100644
--- a/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp
+++ b/test/std/atomics/atomics.types.generic/integral_typedefs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -41,7 +40,7 @@
 #include <atomic>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::atomic<char>, std::atomic_char>::value), "");
     static_assert((std::is_same<std::atomic<signed char>, std::atomic_schar>::value), "");
@@ -72,4 +71,6 @@ int main()
     static_assert((std::is_same<std::atomic<uint32_t>,  std::atomic_uint32_t>::value), "");
     static_assert((std::is_same<std::atomic<int64_t>,   std::atomic_int64_t>::value), "");
     static_assert((std::is_same<std::atomic<uint64_t>,  std::atomic_uint64_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.generic/trivially_copyable.fail.cpp b/test/std/atomics/atomics.types.generic/trivially_copyable.fail.cpp
index 1309f3f1b..3ec8ed25c 100644
--- a/test/std/atomics/atomics.types.generic/trivially_copyable.fail.cpp
+++ b/test/std/atomics/atomics.types.generic/trivially_copyable.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,9 @@ void test ( T t ) {
     std::atomic<T> t0(t);
 }
 
-int main()
+int main(int, char**)
 {
     test(NotTriviallyCopyable(42));
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.generic/trivially_copyable.pass.cpp b/test/std/atomics/atomics.types.generic/trivially_copyable.pass.cpp
index 622643f21..229761eb3 100644
--- a/test/std/atomics/atomics.types.generic/trivially_copyable.pass.cpp
+++ b/test/std/atomics/atomics.types.generic/trivially_copyable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -69,9 +68,11 @@ void test ( T t ) {
     std::atomic<T> t0(t);
     }
 
-int main()
+int main(int, char**)
 {
     test(TriviallyCopyable(42));
     test(std::this_thread::get_id());
     test(std::chrono::nanoseconds(2));
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.arith/nothing_to_do.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.arith/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.arith/nothing_to_do.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.arith/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.general/nothing_to_do.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.general/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.general/nothing_to_do.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.general/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.pointer/nothing_to_do.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.pointer/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.pointer/nothing_to_do.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.pointer/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
index e40979f45..041845d5b 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -56,7 +55,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
index 8ac8fc0c2..99a850886 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -63,7 +62,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
index da0f5c3de..a2a9e205d 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -57,7 +56,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
index b70446bdf..2ad17f1cb 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -65,7 +64,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp
index 680fe8f82..d13238e65 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,7 +41,9 @@ struct TestFn {
 };
 
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp
index 0df4033c8..2acbcb20f 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -44,7 +43,9 @@ struct TestFn {
 };
 
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.pass.cpp
index e30543bdb..f84a48983 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -75,9 +74,11 @@ void testp()
     }
 }
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
     testp<int*>();
     testp<const int*>();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.pass.cpp
index 2dc90c9ac..fbdf3fffc 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -80,9 +79,11 @@ testp()
     }
 }
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
     testp<int*>();
     testp<const int*>();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and.pass.cpp
index e101029bd..dfaaaa3e5 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -45,7 +44,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and_explicit.pass.cpp
index 7180c14d4..d31245a84 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_and_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -47,7 +46,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or.pass.cpp
index 241026bcf..741dca00e 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -45,7 +44,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or_explicit.pass.cpp
index c7e0b1232..e56e946f4 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_or_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -47,7 +46,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.pass.cpp
index e1b126474..13fde4ad6 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -75,9 +74,11 @@ void testp()
     }
 }
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
     testp<int*>();
     testp<const int*>();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.pass.cpp
index 882a1f2c4..af97bcc60 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -80,9 +79,11 @@ void testp()
     }
 }
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
     testp<int*>();
     testp<const int*>();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor.pass.cpp
index 9306abfd0..0e6f99f36 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -45,7 +44,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor_explicit.pass.cpp
index c6a80a17e..ece156945 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_xor_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -47,7 +46,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachIntegralType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_helpers.h b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_helpers.h
index 2ba561fe2..65676339c 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_helpers.h
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_helpers.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp
index 2cac65a83..0e5b920f9 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_is_lock_free.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_is_lock_free.pass.cpp
index 27e398736..bfa24dae5 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_is_lock_free.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_is_lock_free.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -41,8 +40,10 @@ struct A
     char _[4];
 };
 
-int main()
+int main(int, char**)
 {
     TestFn<A>()();
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp
index b6d330cef..b775c5467 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp
index 1208b7902..0384baa5a 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,9 @@ struct TestFn {
   }
 };
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp
index 3f8245bff..0fb3bc7dd 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,9 @@ struct TestFn {
 };
 
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp
index 627a04b74..11aa295de 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,9 @@ struct TestFn {
 };
 
 
-int main()
+int main(int, char**)
 {
     TestEachAtomicType<TestFn>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_var_init.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_var_init.pass.cpp
index 9f25807fb..1588af327 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_var_init.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_var_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,8 +17,10 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::atomic<int> v = ATOMIC_VAR_INIT(5);
     assert(v == 5);
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/ctor.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/ctor.pass.cpp
index f6944c725..d692e931b 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.req/ctor.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.req/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -57,8 +56,10 @@ struct TestFunc {
 };
 
 
-int main()
+int main(int, char**)
 {
     TestFunc<UserType>()();
     TestEachIntegralType<TestFunc>()();
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/atomics.types.operations.templ/nothing_to_do.pass.cpp b/test/std/atomics/atomics.types.operations/atomics.types.operations.templ/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/atomics/atomics.types.operations/atomics.types.operations.templ/nothing_to_do.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/atomics.types.operations.templ/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/atomics/atomics.types.operations/nothing_to_do.pass.cpp b/test/std/atomics/atomics.types.operations/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/atomics/atomics.types.operations/nothing_to_do.pass.cpp
+++ b/test/std/atomics/atomics.types.operations/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/Copyable.h b/test/std/containers/Copyable.h
index 9542c7e85..2362df0e1 100644
--- a/test/std/containers/Copyable.h
+++ b/test/std/containers/Copyable.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/containers/Emplaceable.h b/test/std/containers/Emplaceable.h
index 04b1f8543..e1c4ad724 100644
--- a/test/std/containers/Emplaceable.h
+++ b/test/std/containers/Emplaceable.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/containers/NotConstructible.h b/test/std/containers/NotConstructible.h
index 55e648049..f536823af 100644
--- a/test/std/containers/NotConstructible.h
+++ b/test/std/containers/NotConstructible.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/containers/associative/iterator_types.pass.cpp b/test/std/containers/associative/iterator_types.pass.cpp
index 2026219d8..1b8556fb5 100644
--- a/test/std/containers/associative/iterator_types.pass.cpp
+++ b/test/std/containers/associative/iterator_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ void testSet() {
   }
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef std::map<int, int> Map;
     typedef std::pair<const int, int> ValueTp;
@@ -128,4 +127,6 @@ int main() {
     testSet<Set, ValueTp, min_pointer<const ValueTp>>();
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/PR28469_undefined_behavior_segfault.sh.cpp b/test/std/containers/associative/map/PR28469_undefined_behavior_segfault.sh.cpp
index 646c6be7d..030fdaf39 100644
--- a/test/std/containers/associative/map/PR28469_undefined_behavior_segfault.sh.cpp
+++ b/test/std/containers/associative/map/PR28469_undefined_behavior_segfault.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@ struct F {
     F() { m[42] = &dummy; }
 };
 
-int main() {
+int main(int, char**) {
     F f;
     f = F();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/allocator_mismatch.fail.cpp b/test/std/containers/associative/map/allocator_mismatch.fail.cpp
index f5da14539..faec5aa40 100644
--- a/test/std/containers/associative/map/allocator_mismatch.fail.cpp
+++ b/test/std/containers/associative/map/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <map>
 
-int main()
+int main(int, char**)
 {
     std::map<int, int, std::less<int>, std::allocator<long> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/compare.pass.cpp b/test/std/containers/associative/map/compare.pass.cpp
index 8c429cbd3..84de27184 100644
--- a/test/std/containers/associative/map/compare.pass.cpp
+++ b/test/std/containers/associative/map/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct Key {
   bool operator< (const Key&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::map<Key, int> MapT;
     typedef MapT::iterator Iter;
@@ -49,4 +48,6 @@ int main()
         assert(!result2.second);
         assert(map[Key(0)] == 42);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/gcc_workaround.pass.cpp b/test/std/containers/associative/map/gcc_workaround.pass.cpp
new file mode 100644
index 000000000..6c87e51f7
--- /dev/null
+++ b/test/std/containers/associative/map/gcc_workaround.pass.cpp
@@ -0,0 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Tests workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37804
+
+#include <map>
+std::map<int,int>::iterator it;
+#include <set>
+using std::set;
+using std::multiset;
+
+int main(int, char**) { return 0; }
diff --git a/test/std/containers/associative/map/incomplete_type.pass.cpp b/test/std/containers/associative/map/incomplete_type.pass.cpp
index 6acf83129..a45c50c32 100644
--- a/test/std/containers/associative/map/incomplete_type.pass.cpp
+++ b/test/std/containers/associative/map/incomplete_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 inline bool operator<(A const& L, A const& R)  { return L.data < R.data; }
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/at.pass.cpp b/test/std/containers/associative/map/map.access/at.pass.cpp
index 76eda046c..c13c6a64a 100644
--- a/test/std/containers/associative/map/map.access/at.pass.cpp
+++ b/test/std/containers/associative/map/map.access/at.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<const int, double> V;
@@ -161,4 +160,6 @@ int main()
         assert(m.size() == 7);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/empty.fail.cpp b/test/std/containers/associative/map/map.access/empty.fail.cpp
index 14ac13c99..61c4e757b 100644
--- a/test/std/containers/associative/map/map.access/empty.fail.cpp
+++ b/test/std/containers/associative/map/map.access/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::map<int, int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/empty.pass.cpp b/test/std/containers/associative/map/map.access/empty.pass.cpp
index 17b9cfd4e..cff13df7a 100644
--- a/test/std/containers/associative/map/map.access/empty.pass.cpp
+++ b/test/std/containers/associative/map/map.access/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double> M;
@@ -40,4 +39,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/index_key.pass.cpp b/test/std/containers/associative/map/map.access/index_key.pass.cpp
index 5f3d109d1..8df052e01 100644
--- a/test/std/containers/associative/map/map.access/index_key.pass.cpp
+++ b/test/std/containers/associative/map/map.access/index_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "container_test_types.h"
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -140,4 +139,6 @@ int main()
     assert(m.size() == 8);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/index_rv_key.pass.cpp b/test/std/containers/associative/map/map.access/index_rv_key.pass.cpp
index bc91475c2..7effa0c64 100644
--- a/test/std/containers/associative/map/map.access/index_rv_key.pass.cpp
+++ b/test/std/containers/associative/map/map.access/index_rv_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "min_allocator.h"
 #include "container_test_types.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::map<MoveOnly, double> m;
@@ -77,4 +76,6 @@ int main()
             }
         }
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/index_tuple.pass.cpp b/test/std/containers/associative/map/map.access/index_tuple.pass.cpp
index 8d27eabdf..bc99f6ef8 100644
--- a/test/std/containers/associative/map/map.access/index_tuple.pass.cpp
+++ b/test/std/containers/associative/map/map.access/index_tuple.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,9 +22,11 @@
 #include <tuple>
 
 
-int main()
+int main(int, char**)
 {
     using namespace std;
     map<tuple<int,int>, size_t> m;
     m[make_tuple(2,3)]=7;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/iterator.pass.cpp b/test/std/containers/associative/map/map.access/iterator.pass.cpp
index 27fe3511c..39b573a13 100644
--- a/test/std/containers/associative/map/map.access/iterator.pass.cpp
+++ b/test/std/containers/associative/map/map.access/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<const int, double> V;
@@ -226,4 +225,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/max_size.pass.cpp b/test/std/containers/associative/map/map.access/max_size.pass.cpp
index 9df3b074e..b38cf1146 100644
--- a/test/std/containers/associative/map/map.access/max_size.pass.cpp
+++ b/test/std/containers/associative/map/map.access/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
   typedef std::pair<const int, int> KV;
   {
@@ -48,4 +47,6 @@ int main()
     assert(c.max_size() <= max_dist);
     assert(c.max_size() <= alloc_max_size(c.get_allocator()));
   }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.access/size.pass.cpp b/test/std/containers/associative/map/map.access/size.pass.cpp
index b9d56167a..bb4b14e02 100644
--- a/test/std/containers/associative/map/map.access/size.pass.cpp
+++ b/test/std/containers/associative/map/map.access/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double> M;
@@ -56,4 +55,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/alloc.pass.cpp b/test/std/containers/associative/map/map.cons/alloc.pass.cpp
index b1c60e0f5..5bb9abc88 100644
--- a/test/std/containers/associative/map/map.cons/alloc.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::less<int> C;
@@ -47,4 +46,6 @@ int main()
     assert(m.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/assign_initializer_list.pass.cpp b/test/std/containers/associative/map/map.cons/assign_initializer_list.pass.cpp
index 354911b76..612838ef6 100644
--- a/test/std/containers/associative/map/map.cons/assign_initializer_list.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -70,4 +69,6 @@ int main()
     assert(*next(m.begin()) == V(2, 1));
     assert(*next(m.begin(), 2) == V(3, 1));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/compare.pass.cpp b/test/std/containers/associative/map/map.cons/compare.pass.cpp
index 326ce74fc..40a8e38ae 100644
--- a/test/std/containers/associative/map/map.cons/compare.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_compare<std::less<int> > C;
@@ -39,4 +38,6 @@ int main()
     assert(m.key_comp() == C(3));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/compare_alloc.pass.cpp b/test/std/containers/associative/map/map.cons/compare_alloc.pass.cpp
index 1325f4782..71bc32295 100644
--- a/test/std/containers/associative/map/map.cons/compare_alloc.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_compare<std::less<int> > C;
@@ -51,4 +50,6 @@ int main()
     assert(m.get_allocator() == A{});
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/compare_copy_constructible.fail.cpp b/test/std/containers/associative/map/map.cons/compare_copy_constructible.fail.cpp
index a1fde845e..3c714de40 100644
--- a/test/std/containers/associative/map/map.cons/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/associative/map/map.cons/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::map<int, int, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/copy.pass.cpp b/test/std/containers/associative/map/map.cons/copy.pass.cpp
index 081c8f7c0..8eec27b3e 100644
--- a/test/std/containers/associative/map/map.cons/copy.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<const int, double> V;
@@ -127,4 +126,6 @@ int main()
         assert(*next(mo.begin(), 2) == V(3, 1));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/copy_alloc.pass.cpp b/test/std/containers/associative/map/map.cons/copy_alloc.pass.cpp
index 8391ebab0..d25504382 100644
--- a/test/std/containers/associative/map/map.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -126,4 +125,6 @@ int main()
     assert(*next(mo.begin(), 2) == V(3, 1));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp b/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
index 0a4f70e59..a902e0560 100644
--- a/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -109,7 +108,7 @@ bool balanced_allocs() {
     }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<const int, double> V;
@@ -338,4 +337,6 @@ int main()
     }
     assert(balanced_allocs());
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/default.pass.cpp b/test/std/containers/associative/map/map.cons/default.pass.cpp
index 29cd4b4ff..5d3fcaee1 100644
--- a/test/std/containers/associative/map/map.cons/default.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::map<int, double> m;
@@ -51,4 +50,6 @@ int main()
     assert(m.begin() == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/default_noexcept.pass.cpp b/test/std/containers/associative/map/map.cons/default_noexcept.pass.cpp
index e06410dcf..2e4b4242d 100644
--- a/test/std/containers/associative/map/map.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
 #if defined(_LIBCPP_VERSION)
@@ -55,4 +54,6 @@ int main()
         typedef std::map<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/default_recursive.pass.cpp b/test/std/containers/associative/map/map.cons/default_recursive.pass.cpp
index b4b72725f..af8fbe79f 100644
--- a/test/std/containers/associative/map/map.cons/default_recursive.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/default_recursive.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ struct X
     std::map<int, X>::const_reverse_iterator cri;
 };
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/dtor_noexcept.pass.cpp b/test/std/containers/associative/map/map.cons/dtor_noexcept.pass.cpp
index 7f563b7cf..2a2e89bf4 100644
--- a/test/std/containers/associative/map/map.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_comp
     bool operator()(const T&, const T&) const noexcept { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
     {
@@ -49,4 +48,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/initializer_list.pass.cpp b/test/std/containers/associative/map/map.cons/initializer_list.pass.cpp
index 0504b1adc..1303f7ef2 100644
--- a/test/std/containers/associative/map/map.cons/initializer_list.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -62,4 +61,6 @@ int main()
     assert(*next(m.begin()) == V(2, 1));
     assert(*next(m.begin(), 2) == V(3, 1));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/initializer_list_compare.pass.cpp b/test/std/containers/associative/map/map.cons/initializer_list_compare.pass.cpp
index d9c1fb898..9b6a47ac3 100644
--- a/test/std/containers/associative/map/map.cons/initializer_list_compare.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/initializer_list_compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -64,4 +63,6 @@ int main()
     assert(*next(m.begin(), 2) == V(3, 1));
     assert(m.key_comp() == C(3));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/initializer_list_compare_alloc.pass.cpp b/test/std/containers/associative/map/map.cons/initializer_list_compare_alloc.pass.cpp
index 70783e625..0da3115f7 100644
--- a/test/std/containers/associative/map/map.cons/initializer_list_compare_alloc.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/initializer_list_compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -117,4 +116,6 @@ int main()
     assert(m.key_comp() == C(3));
     assert(m.get_allocator() == a);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/iter_iter.pass.cpp b/test/std/containers/associative/map/map.cons/iter_iter.pass.cpp
index 48610f3b3..243800cfd 100644
--- a/test/std/containers/associative/map/map.cons/iter_iter.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -65,4 +64,6 @@ int main()
     assert(*next(m.begin(), 2) == V(3, 1));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/iter_iter_comp.pass.cpp b/test/std/containers/associative/map/map.cons/iter_iter_comp.pass.cpp
index 1389f7144..12a079ea0 100644
--- a/test/std/containers/associative/map/map.cons/iter_iter_comp.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/iter_iter_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -70,4 +69,6 @@ int main()
     assert(*next(m.begin(), 2) == V(3, 1));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/iter_iter_comp_alloc.pass.cpp b/test/std/containers/associative/map/map.cons/iter_iter_comp_alloc.pass.cpp
index 923a2124e..56396799d 100644
--- a/test/std/containers/associative/map/map.cons/iter_iter_comp_alloc.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/iter_iter_comp_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -120,4 +119,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/move.pass.cpp b/test/std/containers/associative/map/map.cons/move.pass.cpp
index 69f762ac5..ecf8c9dab 100644
--- a/test/std/containers/associative/map/map.cons/move.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -115,4 +114,6 @@ int main()
         assert(mo.size() == 0);
         assert(distance(mo.begin(), mo.end()) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp b/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp
index 5f7ab8ece..cc22a4c34 100644
--- a/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,13 +17,14 @@
 #include <map>
 #include <cassert>
 
+#include "test_macros.h"
 #include "MoveOnly.h"
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 #include "min_allocator.h"
 #include "Counter.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -63,7 +63,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(7));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -102,7 +102,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -141,7 +141,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef Counter<int> T;
@@ -177,16 +177,19 @@ int main()
 
             M m3(std::move(m1), A());
             assert(m3 == m2);
-            assert(m1.empty());
-            assert(Counter_base::gConstructed == num+6);
+            LIBCPP_ASSERT(m1.empty());
+            assert(Counter_base::gConstructed >= (int)(num+6));
+            assert(Counter_base::gConstructed <= (int)(num+6+m1.size()));
 
             {
             M m4(std::move(m2), A(5));
-            assert(Counter_base::gConstructed == num+6);
+            assert(Counter_base::gConstructed >= (int)(num+6));
+            assert(Counter_base::gConstructed <= (int)(num+6+m1.size()+m2.size()));
             assert(m4 == m3);
-            assert(m2.empty());
+            LIBCPP_ASSERT(m2.empty());
             }
-            assert(Counter_base::gConstructed == num+3);
+            assert(Counter_base::gConstructed >= (int)(num+3));
+            assert(Counter_base::gConstructed <= (int)(num+3+m1.size()+m2.size()));
         }
         assert(Counter_base::gConstructed == 0);
     }
@@ -227,7 +230,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A());
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -266,6 +269,8 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A{});
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/move_assign.pass.cpp b/test/std/containers/associative/map/map.cons/move_assign.pass.cpp
index 8c0ef6e9a..758d0f83f 100644
--- a/test/std/containers/associative/map/map.cons/move_assign.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -185,4 +184,6 @@ int main()
         assert(m3.key_comp() == C(5));
         assert(m1.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/move_assign_noexcept.pass.cpp b/test/std/containers/associative/map/map.cons/move_assign_noexcept.pass.cpp
index b45e821ad..fcb926071 100644
--- a/test/std/containers/associative/map/map.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
     {
@@ -55,4 +54,6 @@ int main()
         typedef std::map<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.cons/move_noexcept.pass.cpp b/test/std/containers/associative/map/map.cons/move_noexcept.pass.cpp
index 84a960974..44b2b7e22 100644
--- a/test/std/containers/associative/map/map.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/associative/map/map.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     typedef std::pair<const MoveOnly, MoveOnly> V;
@@ -53,4 +52,6 @@ int main()
         typedef std::map<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp b/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp
index f8cbc15d1..88a958368 100644
--- a/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp
+++ b/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0<S>({1,2,3}, False, {1,2,3});
 }
 
-int main()
+int main(int, char**)
 {
     test<std::map<int, int>>();
     test<std::map<int, int, std::less<int>, min_allocator<std::pair<const int, int>>>> ();
@@ -75,5 +74,7 @@ int main()
 
     test<std::map<long, short>>();
     test<std::map<short, double>>();
+
+  return 0;
 }
 
diff --git a/test/std/containers/associative/map/map.modifiers/clear.pass.cpp b/test/std/containers/associative/map/map.modifiers/clear.pass.cpp
index ab4642fa8..5c6d00e9f 100644
--- a/test/std/containers/associative/map/map.modifiers/clear.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::map<int, double> M;
@@ -63,4 +62,6 @@ int main()
         assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/emplace.pass.cpp b/test/std/containers/associative/map/map.modifiers/emplace.pass.cpp
index 3b595fc73..382e5c8ba 100644
--- a/test/std/containers/associative/map/map.modifiers/emplace.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::map<int, DefaultOnly> M;
@@ -160,4 +159,6 @@ int main()
         assert(m.begin()->first == 2);
         assert(m.begin()->second == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/emplace_hint.pass.cpp b/test/std/containers/associative/map/map.modifiers/emplace_hint.pass.cpp
index 7236276a2..516d88054 100644
--- a/test/std/containers/associative/map/map.modifiers/emplace_hint.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::map<int, DefaultOnly> M;
@@ -155,4 +154,6 @@ int main()
         assert(m.begin()->first == 2);
         assert(m.begin()->second == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/erase_iter.pass.cpp b/test/std/containers/associative/map/map.modifiers/erase_iter.pass.cpp
index cd65c4302..0f23ef638 100644
--- a/test/std/containers/associative/map/map.modifiers/erase_iter.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct TemplateConstructor
 
 bool operator<(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::map<int, double> M;
@@ -256,4 +255,6 @@ int main()
             c.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/erase_iter_iter.pass.cpp b/test/std/containers/associative/map/map.modifiers/erase_iter_iter.pass.cpp
index 144cfac2c..71fa96ce1 100644
--- a/test/std/containers/associative/map/map.modifiers/erase_iter_iter.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::map<int, double> M;
@@ -154,4 +153,6 @@ int main()
         assert(i == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/erase_key.pass.cpp b/test/std/containers/associative/map/map.modifiers/erase_key.pass.cpp
index c1b31e78d..da96499b0 100644
--- a/test/std/containers/associative/map/map.modifiers/erase_key.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::map<int, double> M;
@@ -272,4 +271,6 @@ int main()
         assert(s == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp b/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp
index ea7fd8907..f2b67c9ff 100644
--- a/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using map_type = std::map<int, int>;
@@ -64,4 +63,6 @@ int main()
         min_alloc_map m = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}, {6, 6}};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp b/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp
index 41cd09300..018e9acf8 100644
--- a/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::map<int, int> m = {{1,1}, {2,2}, {3,3}, {4,4}, {5,5}, {6,6}};
@@ -73,4 +72,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp
index d98047d02..f3e840021 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 #include "container_test_types.h"
 #include "../../../map_allocator_requirement_test_templates.h"
 
-int main()
+int main(int, char**)
 {
   testMapInsert<TCT::map<> >();
   testMapInsertHint<TCT::map<> >();
   testMapEmplace<TCT::map<> >();
   testMapEmplaceHint<TCT::map<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_cv.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_cv.pass.cpp
index e2ffcba37..079b0eaca 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_cv.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ void do_insert_cv_test()
     assert(r.first->second == 3.5);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_cv_test<std::map<int, double> >();
 #if TEST_STD_VER >= 11
@@ -69,4 +68,6 @@ int main()
         do_insert_cv_test<M>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_initializer_list.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_initializer_list.pass.cpp
index de8191a6b..ea6c13800 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_initializer_list.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -66,4 +65,6 @@ int main()
     assert(*next(m.begin()) == V(2, 1));
     assert(*next(m.begin(), 2) == V(3, 1));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_iter_cv.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_iter_cv.pass.cpp
index 0c7e124e0..a49a28c67 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_iter_cv.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_iter_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ void do_insert_iter_cv_test()
     assert(r->second == 3.5);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_iter_cv_test<std::map<int, double> >();
 #if TEST_STD_VER >= 11
@@ -65,4 +64,6 @@ int main()
         do_insert_iter_cv_test<M>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_iter_iter.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_iter_iter.pass.cpp
index edc1a1e2c..a6a776336 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_iter_iter.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::map<int, double> M;
@@ -74,4 +73,6 @@ int main()
         assert(next(m.begin(), 2)->second == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_iter_rv.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_iter_rv.pass.cpp
index 3edb9c06e..8cbbebe5d 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_iter_rv.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_iter_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ void do_insert_iter_rv_test()
     assert(r->first == 3);
     assert(r->second == 3);
 }
-int main()
+int main(int, char**)
 {
     do_insert_iter_rv_test<std::map<int, MoveOnly>, std::pair<int, MoveOnly>>();
     do_insert_iter_rv_test<std::map<int, MoveOnly>, std::pair<const int, MoveOnly>>();
@@ -95,4 +94,6 @@ int main()
         assert(r->second == 3);
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_node_type.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_node_type.pass.cpp
index cc1704c30..f3f166260 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_node_type.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,10 +75,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::map<int, int> m;
     test(m);
     std::map<int, int, std::less<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp
index 3c6b3e31a..084f7ee2c 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,10 +54,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::map<int, int> m;
     test(m);
     std::map<int, int, std::less<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_or_assign.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_or_assign.pass.cpp
index 8689dc728..bd9625a09 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_or_assign.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_or_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -57,7 +56,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     { // pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj);
         typedef std::map<int, Moveable> M;
@@ -182,4 +181,6 @@ int main()
         assert(r->first.get()  == 3);  // key
         assert(r->second.get() == 5);  // value
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/insert_rv.pass.cpp b/test/std/containers/associative/map/map.modifiers/insert_rv.pass.cpp
index 503d92910..e6fb13ee3 100644
--- a/test/std/containers/associative/map/map.modifiers/insert_rv.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/insert_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ void do_insert_rv_test()
     assert(r.first->second == 3);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_rv_test<std::map<int, MoveOnly>, std::pair<int, MoveOnly>>();
     do_insert_rv_test<std::map<int, MoveOnly>, std::pair<const int, MoveOnly>>();
@@ -104,4 +103,6 @@ int main()
         assert(r.first->first == 3);
         assert(r.first->second == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/merge.pass.cpp b/test/std/containers/associative/map/map.modifiers/merge.pass.cpp
index bb75e1d60..ae943df6a 100644
--- a/test/std/containers/associative/map/map.modifiers/merge.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_comparator
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::map<int, int> src{{1, 0}, {3, 0}, {5, 0}};
@@ -147,4 +146,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/associative/map/map.modifiers/try.emplace.pass.cpp b/test/std/containers/associative/map/map.modifiers/try.emplace.pass.cpp
index 63704c914..fe9484a3c 100644
--- a/test/std/containers/associative/map/map.modifiers/try.emplace.pass.cpp
+++ b/test/std/containers/associative/map/map.modifiers/try.emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -55,7 +54,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     { // pair<iterator, bool> try_emplace(const key_type& k, Args&&... args);
         typedef std::map<int, Moveable> M;
@@ -179,4 +178,6 @@ int main()
         assert(r->first.get()  == 3); // key
         assert(r->second.get() == 4); // value
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/count.pass.cpp b/test/std/containers/associative/map/map.ops/count.pass.cpp
index c35ad3f0a..8abae288b 100644
--- a/test/std/containers/associative/map/map.ops/count.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -191,4 +190,6 @@ int main()
     assert(r == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/count0.pass.cpp b/test/std/containers/associative/map/map.ops/count0.pass.cpp
index 5649c57f2..cce0444fd 100644
--- a/test/std/containers/associative/map/map.ops/count0.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/count0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less> M;
@@ -36,4 +35,6 @@ int main()
     typedef std::map<int, double, transparent_less_not_referenceable> M;
     assert(M().count(C2Int{5}) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/count1.fail.cpp b/test/std/containers/associative/map/map.ops/count1.fail.cpp
index 9fa9f87b8..42dc59c27 100644
--- a/test/std/containers/associative/map/map.ops/count1.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/count1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/map/map.ops/count2.fail.cpp b/test/std/containers/associative/map/map.ops/count2.fail.cpp
index c6380635a..1fe6b927d 100644
--- a/test/std/containers/associative/map/map.ops/count2.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/count2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/map/map.ops/count3.fail.cpp b/test/std/containers/associative/map/map.ops/count3.fail.cpp
index 0fddf61b8..3fd930eb2 100644
--- a/test/std/containers/associative/map/map.ops/count3.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/count3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/map/map.ops/count_transparent.pass.cpp b/test/std/containers/associative/map/map.ops/count_transparent.pass.cpp
index 899757e54..fa6490242 100644
--- a/test/std/containers/associative/map/map.ops/count_transparent.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/count_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,10 +40,12 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::map<std::pair<int, int>, int, Comp> s{
       {{2, 1}, 1}, {{1, 2}, 2}, {{1, 3}, 3}, {{1, 4}, 4}, {{2, 2}, 5}};
 
   auto cnt = s.count(1);
   assert(cnt == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/equal_range.pass.cpp b/test/std/containers/associative/map/map.ops/equal_range.pass.cpp
index 28747063a..c46e52c71 100644
--- a/test/std/containers/associative/map/map.ops/equal_range.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/equal_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -488,4 +487,6 @@ int main()
     assert(r.second == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/equal_range0.pass.cpp b/test/std/containers/associative/map/map.ops/equal_range0.pass.cpp
index 310db6d89..22f067a2a 100644
--- a/test/std/containers/associative/map/map.ops/equal_range0.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/equal_range0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less> M;
@@ -42,4 +41,6 @@ int main()
     P result = example.equal_range(C2Int{5});
     assert(result.first == result.second);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/equal_range1.fail.cpp b/test/std/containers/associative/map/map.ops/equal_range1.fail.cpp
index b8c8607ee..f8ccfc3d8 100644
--- a/test/std/containers/associative/map/map.ops/equal_range1.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/equal_range1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/map/map.ops/equal_range2.fail.cpp b/test/std/containers/associative/map/map.ops/equal_range2.fail.cpp
index 2fb1b2d2e..dcde9fc2e 100644
--- a/test/std/containers/associative/map/map.ops/equal_range2.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/equal_range2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/map/map.ops/equal_range3.fail.cpp b/test/std/containers/associative/map/map.ops/equal_range3.fail.cpp
index ad499e1c6..f773c482c 100644
--- a/test/std/containers/associative/map/map.ops/equal_range3.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/equal_range3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/map/map.ops/equal_range_transparent.pass.cpp b/test/std/containers/associative/map/map.ops/equal_range_transparent.pass.cpp
index cce90c695..442213561 100644
--- a/test/std/containers/associative/map/map.ops/equal_range_transparent.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/equal_range_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::map<std::pair<int, int>, int, Comp> s{
       {{2, 1}, 1}, {{1, 2}, 2}, {{1, 3}, 3}, {{1, 4}, 4}, {{2, 2}, 5}};
 
@@ -57,4 +56,6 @@ int main() {
   }
 
   assert(nels == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/find.pass.cpp b/test/std/containers/associative/map/map.ops/find.pass.cpp
index b23d303df..bcf498ecf 100644
--- a/test/std/containers/associative/map/map.ops/find.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -258,4 +257,6 @@ int main()
     assert(r == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/find0.pass.cpp b/test/std/containers/associative/map/map.ops/find0.pass.cpp
index a11acb103..affc61efb 100644
--- a/test/std/containers/associative/map/map.ops/find0.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/find0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less> M;
@@ -38,4 +37,6 @@ int main()
     M example;
     assert(example.find(C2Int{5}) == example.end());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/find1.fail.cpp b/test/std/containers/associative/map/map.ops/find1.fail.cpp
index 6c0f237a2..6bd1a95ab 100644
--- a/test/std/containers/associative/map/map.ops/find1.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/find1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/map/map.ops/find2.fail.cpp b/test/std/containers/associative/map/map.ops/find2.fail.cpp
index b915b4396..7af1c0eb8 100644
--- a/test/std/containers/associative/map/map.ops/find2.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/find2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/map/map.ops/find3.fail.cpp b/test/std/containers/associative/map/map.ops/find3.fail.cpp
index 9303a7f07..32164fd3a 100644
--- a/test/std/containers/associative/map/map.ops/find3.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/find3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/map/map.ops/lower_bound.pass.cpp b/test/std/containers/associative/map/map.ops/lower_bound.pass.cpp
index 9c63dc7ab..5b1c925a6 100644
--- a/test/std/containers/associative/map/map.ops/lower_bound.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/lower_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -370,4 +369,6 @@ int main()
     assert(r == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/lower_bound0.pass.cpp b/test/std/containers/associative/map/map.ops/lower_bound0.pass.cpp
index 2936da3cb..a92790f2b 100644
--- a/test/std/containers/associative/map/map.ops/lower_bound0.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/lower_bound0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less> M;
@@ -38,4 +37,6 @@ int main()
     M example;
     assert(example.lower_bound(C2Int{5}) == example.end());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/lower_bound1.fail.cpp b/test/std/containers/associative/map/map.ops/lower_bound1.fail.cpp
index beb901cf0..efdc762e8 100644
--- a/test/std/containers/associative/map/map.ops/lower_bound1.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/lower_bound1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/map/map.ops/lower_bound2.fail.cpp b/test/std/containers/associative/map/map.ops/lower_bound2.fail.cpp
index 2a2258e8f..362b223ff 100644
--- a/test/std/containers/associative/map/map.ops/lower_bound2.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/lower_bound2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/map/map.ops/lower_bound3.fail.cpp b/test/std/containers/associative/map/map.ops/lower_bound3.fail.cpp
index 40dc708ad..cc8bdf92a 100644
--- a/test/std/containers/associative/map/map.ops/lower_bound3.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/lower_bound3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/map/map.ops/upper_bound.pass.cpp b/test/std/containers/associative/map/map.ops/upper_bound.pass.cpp
index 7276b74b1..c7fdd879a 100644
--- a/test/std/containers/associative/map/map.ops/upper_bound.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/upper_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -333,4 +332,6 @@ int main()
     assert(r == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/upper_bound0.pass.cpp b/test/std/containers/associative/map/map.ops/upper_bound0.pass.cpp
index fa97a7144..8f58df61b 100644
--- a/test/std/containers/associative/map/map.ops/upper_bound0.pass.cpp
+++ b/test/std/containers/associative/map/map.ops/upper_bound0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less> M;
@@ -38,4 +37,6 @@ int main()
     M example;
     assert(example.upper_bound(C2Int{5}) == example.end());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.ops/upper_bound1.fail.cpp b/test/std/containers/associative/map/map.ops/upper_bound1.fail.cpp
index be40cec76..8ed0eed59 100644
--- a/test/std/containers/associative/map/map.ops/upper_bound1.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/upper_bound1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/map/map.ops/upper_bound2.fail.cpp b/test/std/containers/associative/map/map.ops/upper_bound2.fail.cpp
index c03c249b7..d08b6c0f0 100644
--- a/test/std/containers/associative/map/map.ops/upper_bound2.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/upper_bound2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/map/map.ops/upper_bound3.fail.cpp b/test/std/containers/associative/map/map.ops/upper_bound3.fail.cpp
index 584833921..df7cd2269 100644
--- a/test/std/containers/associative/map/map.ops/upper_bound3.fail.cpp
+++ b/test/std/containers/associative/map/map.ops/upper_bound3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/map/map.special/member_swap.pass.cpp b/test/std/containers/associative/map/map.special/member_swap.pass.cpp
index f0913a77c..a41e43f7a 100644
--- a/test/std/containers/associative/map/map.special/member_swap.pass.cpp
+++ b/test/std/containers/associative/map/map.special/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -173,4 +172,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp b/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp
index 7e36797d0..811acc457 100644
--- a/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp
+++ b/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -278,4 +277,6 @@ int main()
         assert(m2.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/map.special/swap_noexcept.pass.cpp b/test/std/containers/associative/map/map.special/swap_noexcept.pass.cpp
index c1aa03384..4e1497f7a 100644
--- a/test/std/containers/associative/map/map.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/associative/map/map.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
     {
@@ -139,4 +138,6 @@ int main()
 #endif // _LIBCPP_VERSION
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/associative/map/types.pass.cpp b/test/std/containers/associative/map/types.pass.cpp
index 67cd5acaa..35fc06743 100644
--- a/test/std/containers/associative/map/types.pass.cpp
+++ b/test/std/containers/associative/map/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::map<int, double> C;
@@ -67,4 +66,6 @@ int main()
     static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/allocator_mismatch.fail.cpp b/test/std/containers/associative/multimap/allocator_mismatch.fail.cpp
index 18823212f..47dd64ebc 100644
--- a/test/std/containers/associative/multimap/allocator_mismatch.fail.cpp
+++ b/test/std/containers/associative/multimap/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <map>
 
-int main()
+int main(int, char**)
 {
     std::multimap<int, int, std::less<int>, std::allocator<long> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/empty.fail.cpp b/test/std/containers/associative/multimap/empty.fail.cpp
index 12ca05ef1..bc305b9cc 100644
--- a/test/std/containers/associative/multimap/empty.fail.cpp
+++ b/test/std/containers/associative/multimap/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::multimap<int, int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/empty.pass.cpp b/test/std/containers/associative/multimap/empty.pass.cpp
index f1388d8bf..12866a0f2 100644
--- a/test/std/containers/associative/multimap/empty.pass.cpp
+++ b/test/std/containers/associative/multimap/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double> M;
@@ -40,4 +39,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/incomplete_type.pass.cpp b/test/std/containers/associative/multimap/incomplete_type.pass.cpp
index 306f3d976..0132ce9fe 100644
--- a/test/std/containers/associative/multimap/incomplete_type.pass.cpp
+++ b/test/std/containers/associative/multimap/incomplete_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 inline bool operator<(A const& L, A const& R)  { return L.data < R.data; }
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/iterator.pass.cpp b/test/std/containers/associative/multimap/iterator.pass.cpp
index d79dae9e7..0a6153118 100644
--- a/test/std/containers/associative/multimap/iterator.pass.cpp
+++ b/test/std/containers/associative/multimap/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<const int, double> V;
@@ -230,4 +229,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/max_size.pass.cpp b/test/std/containers/associative/multimap/max_size.pass.cpp
index c836a1823..a4537c3d1 100644
--- a/test/std/containers/associative/multimap/max_size.pass.cpp
+++ b/test/std/containers/associative/multimap/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
   typedef std::pair<const int, int> KV;
   {
@@ -48,4 +47,6 @@ int main()
     assert(c.max_size() <= max_dist);
     assert(c.max_size() <= alloc_max_size(c.get_allocator()));
   }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/alloc.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/alloc.pass.cpp
index 40930f0c9..6e7e3aa09 100644
--- a/test/std/containers/associative/multimap/multimap.cons/alloc.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::less<int> C;
@@ -47,4 +46,6 @@ int main()
     assert(m.get_allocator() == A{});
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/assign_initializer_list.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/assign_initializer_list.pass.cpp
index ae4ab349d..037406251 100644
--- a/test/std/containers/associative/multimap/multimap.cons/assign_initializer_list.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double> C;
@@ -80,4 +79,6 @@ int main()
     assert(*++i == V(3, 1.5));
     assert(*++i == V(3, 2));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/compare.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/compare.pass.cpp
index 02fde1a53..54bf998ec 100644
--- a/test/std/containers/associative/multimap/multimap.cons/compare.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_compare<std::less<int> > C;
@@ -39,4 +38,6 @@ int main()
     assert(m.key_comp() == C(3));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/compare_alloc.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/compare_alloc.pass.cpp
index fc6cef89f..44942036c 100644
--- a/test/std/containers/associative/multimap/multimap.cons/compare_alloc.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_compare<std::less<int> > C;
@@ -51,4 +50,6 @@ int main()
     assert(m.get_allocator() == A{});
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/compare_copy_constructible.fail.cpp b/test/std/containers/associative/multimap/multimap.cons/compare_copy_constructible.fail.cpp
index ee96ed0a1..23fe479f5 100644
--- a/test/std/containers/associative/multimap/multimap.cons/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::multimap<int, int, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/copy.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/copy.pass.cpp
index b7f5c66ad..d3b064256 100644
--- a/test/std/containers/associative/multimap/multimap.cons/copy.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<const int, double> V;
@@ -100,4 +99,6 @@ int main()
         assert(mo.key_comp() == C(5));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/copy_alloc.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/copy_alloc.pass.cpp
index cccebfb54..7144a25f9 100644
--- a/test/std/containers/associative/multimap/multimap.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -99,4 +98,6 @@ int main()
     assert(mo.key_comp() == C(5));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/copy_assign.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/copy_assign.pass.cpp
index b0bf8cc13..6816a5ee4 100644
--- a/test/std/containers/associative/multimap/multimap.cons/copy_assign.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<const int, double> V;
@@ -122,4 +121,6 @@ int main()
         assert(mo.key_comp() == C(5));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/default.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/default.pass.cpp
index af1b22bc9..6b3308843 100644
--- a/test/std/containers/associative/multimap/multimap.cons/default.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::multimap<int, double> m;
@@ -51,4 +50,6 @@ int main()
     assert(m.begin() == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/default_noexcept.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/default_noexcept.pass.cpp
index 6020334ed..e5a28601e 100644
--- a/test/std/containers/associative/multimap/multimap.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
 #if defined(_LIBCPP_VERSION)
@@ -55,4 +54,6 @@ int main()
         typedef std::multimap<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/default_recursive.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/default_recursive.pass.cpp
index 08ca8a441..b51b6b63b 100644
--- a/test/std/containers/associative/multimap/multimap.cons/default_recursive.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/default_recursive.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ struct X
     std::multimap<int, X>::const_reverse_iterator cri;
 };
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/dtor_noexcept.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/dtor_noexcept.pass.cpp
index 2486e8f24..100746789 100644
--- a/test/std/containers/associative/multimap/multimap.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
     {
@@ -49,4 +48,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/initializer_list.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/initializer_list.pass.cpp
index 54b948c3e..2642ba6a8 100644
--- a/test/std/containers/associative/multimap/multimap.cons/initializer_list.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double> C;
@@ -78,4 +77,6 @@ int main()
     assert(*++i == V(3, 1.5));
     assert(*++i == V(3, 2));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare.pass.cpp
index a78e1889a..c8e2d293f 100644
--- a/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_compare<std::less<int> > Cmp;
@@ -86,4 +85,6 @@ int main()
     assert(*++i == V(3, 2));
     assert(m.key_comp() == Cmp(4));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare_alloc.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare_alloc.pass.cpp
index ba6f76e52..592dec997 100644
--- a/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare_alloc.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/initializer_list_compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_compare<std::less<int> > Cmp;
@@ -156,4 +155,6 @@ int main()
     assert(m.key_comp() == Cmp(4));
     assert(m.get_allocator() == A{});
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/iter_iter.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/iter_iter.pass.cpp
index de6d97dbc..4d92b3d0b 100644
--- a/test/std/containers/associative/multimap/multimap.cons/iter_iter.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -110,4 +109,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp.pass.cpp
index 614b3ed8a..d10904a4d 100644
--- a/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -83,4 +82,6 @@ int main()
     assert(*next(m.begin(), 8) == V(3, 2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp_alloc.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp_alloc.pass.cpp
index b0e70c444..a71c757ff 100644
--- a/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp_alloc.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/iter_iter_comp_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<const int, double> V;
@@ -119,4 +118,6 @@ int main()
     assert(*next(m.begin(), 8) == V(3, 2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/move.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/move.pass.cpp
index 1dc6404b0..cef685774 100644
--- a/test/std/containers/associative/multimap/multimap.cons/move.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -127,4 +126,6 @@ int main()
         assert(mo.size() == 0);
         assert(distance(mo.begin(), mo.end()) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp
index 5882283ab..4505cd216 100644
--- a/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,13 +17,14 @@
 #include <map>
 #include <cassert>
 
+#include "test_macros.h"
 #include "MoveOnly.h"
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 #include "min_allocator.h"
 #include "Counter.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -63,7 +63,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(7));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -102,7 +102,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -141,7 +141,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef Counter<int> T;
@@ -177,16 +177,19 @@ int main()
 
             M m3(std::move(m1), A());
             assert(m3 == m2);
-            assert(m1.empty());
-            assert(Counter_base::gConstructed == 3*num);
+            LIBCPP_ASSERT(m1.empty());
+            assert(Counter_base::gConstructed >= (int)(3*num));
+            assert(Counter_base::gConstructed <= (int)(4*num));
 
             {
             M m4(std::move(m2), A(5));
-            assert(Counter_base::gConstructed == 3*num);
+            assert(Counter_base::gConstructed >= (int)(3*num));
+            assert(Counter_base::gConstructed <= (int)(5*num));
             assert(m4 == m3);
-            assert(m2.empty());
+            LIBCPP_ASSERT(m2.empty());
             }
-            assert(Counter_base::gConstructed == 2*num);
+            assert(Counter_base::gConstructed >= (int)(2*num));
+            assert(Counter_base::gConstructed <= (int)(4*num));
         }
         assert(Counter_base::gConstructed == 0);
     }
@@ -227,7 +230,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A());
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -266,6 +269,8 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A{});
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/move_assign.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/move_assign.pass.cpp
index 247425415..386c11ecb 100644
--- a/test/std/containers/associative/multimap/multimap.cons/move_assign.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<MoveOnly, MoveOnly> V;
@@ -185,4 +184,6 @@ int main()
         assert(m3.key_comp() == C(5));
         assert(m1.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/move_assign_noexcept.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/move_assign_noexcept.pass.cpp
index 549c1210b..2afcc5e58 100644
--- a/test/std/containers/associative/multimap/multimap.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
     {
@@ -55,4 +54,6 @@ int main()
         typedef std::multimap<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.cons/move_noexcept.pass.cpp b/test/std/containers/associative/multimap/multimap.cons/move_noexcept.pass.cpp
index fdcdffbed..377167484 100644
--- a/test/std/containers/associative/multimap/multimap.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     typedef std::pair<const MoveOnly, MoveOnly> V;
@@ -53,4 +52,6 @@ int main()
         typedef std::multimap<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp b/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp
index 8e786fdc9..15893f77b 100644
--- a/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -78,7 +77,7 @@ void test()
     test0<S>({1,2,3}, False, {1,2,3});
 }
 
-int main()
+int main(int, char**)
 {
     test<std::multimap<int, int>>();
     test<std::multimap<int, int, std::less<int>, min_allocator<std::pair<const int, int>>>> ();
@@ -86,4 +85,6 @@ int main()
 
     test<std::multimap<long, short>>();
     test<std::multimap<short, double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/clear.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/clear.pass.cpp
index 546a406fe..d05a13b5f 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/clear.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, double> M;
@@ -63,4 +62,6 @@ int main()
         assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/emplace.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/emplace.pass.cpp
index 024cc670e..76d9b1718 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/emplace.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, DefaultOnly> M;
@@ -145,4 +144,6 @@ int main()
         assert(m.begin()->first == 2);
         assert(m.begin()->second == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/emplace_hint.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/emplace_hint.pass.cpp
index d5fde83a7..3ad09f38a 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/emplace_hint.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, DefaultOnly> M;
@@ -155,4 +154,6 @@ int main()
         assert(m.begin()->first == 2);
         assert(m.begin()->second == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/erase_iter.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/erase_iter.pass.cpp
index 6729da413..a0f70d640 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/erase_iter.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct TemplateConstructor
 
 bool operator<(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, double> M;
@@ -298,4 +297,6 @@ int main()
             c.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/erase_iter_iter.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/erase_iter_iter.pass.cpp
index 1069542c5..deef1a146 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/erase_iter_iter.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, double> M;
@@ -154,4 +153,6 @@ int main()
         assert(i == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/erase_key.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/erase_key.pass.cpp
index 44a6abef6..0ab1d4cb8 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/erase_key.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, double> M;
@@ -150,4 +149,6 @@ int main()
         assert(i == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp
index 3e00d2b98..fe3c78832 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using map_type = std::multimap<int, int>;
@@ -64,4 +63,6 @@ int main()
         min_alloc_map m = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}, {6, 6}};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp
index ca69cca6b..e2a80dab2 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::multimap<int, int> m = {{1,1}, {2,2}, {3,3}, {4,4}, {5,5}, {6,6}};
@@ -73,4 +72,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_allocator_requirements.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_allocator_requirements.pass.cpp
index 225bf67bb..9a791af57 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_allocator_requirements.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 #include "../../../map_allocator_requirement_test_templates.h"
 
 
-int main()
+int main(int, char**)
 {
   testMultimapInsert<TCT::multimap<> >();
   testMultimapInsertHint<TCT::multimap<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_cv.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_cv.pass.cpp
index 53874311c..b83034448 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_cv.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ void do_insert_test() {
     assert(r->second == 3.5);
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, double> Container;
@@ -66,4 +65,6 @@ int main()
         do_insert_test<Container>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_initializer_list.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_initializer_list.pass.cpp
index 20e0ba17e..33104ca88 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_initializer_list.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double> C;
@@ -86,4 +85,6 @@ int main()
     assert(*++i == V(3, 2));
     assert(*++i == V(3, 1.5));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_cv.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_cv.pass.cpp
index 05e1096cb..fb3283f83 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_cv.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ void do_insert_hint_test()
     assert(r->second == 4.5);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_hint_test<std::multimap<int, double> >();
 #if TEST_STD_VER >= 11
@@ -64,4 +63,6 @@ int main()
         do_insert_hint_test<M>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_iter.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_iter.pass.cpp
index 1bf437a93..9533a6289 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_iter.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multimap<int, double> M;
@@ -98,4 +97,6 @@ int main()
         assert(next(m.begin(), 8)->second == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_rv.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_rv.pass.cpp
index 47e0d371b..5eea856a0 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_rv.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_iter_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ void do_insert_rv_test()
     assert(r->second == 2);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_rv_test<std::multimap<int, MoveOnly>, std::pair<int, MoveOnly> >();
     do_insert_rv_test<std::multimap<int, MoveOnly>, std::pair<const int, MoveOnly> >();
@@ -96,4 +95,6 @@ int main()
         assert(r->first == 3);
         assert(r->second == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type.pass.cpp
index 906770514..7fb62a7c1 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,10 +68,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::multimap<int, int> m;
     test(m);
     std::multimap<int, int, std::less<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp
index 82e7d80c0..847a70136 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,10 +54,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::multimap<int, int> m;
     test(m);
     std::multimap<int, int, std::less<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/insert_rv.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/insert_rv.pass.cpp
index 022de873f..05393345c 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/insert_rv.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/insert_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ void do_insert_rv_test()
     assert(r->second == 3);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_rv_test<std::multimap<int, MoveOnly>>();
     {
@@ -90,4 +89,6 @@ int main()
         assert(r->first == 3);
         assert(r->second == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.modifiers/merge.pass.cpp b/test/std/containers/associative/multimap/multimap.modifiers/merge.pass.cpp
index f0e38c255..78b24323d 100644
--- a/test/std/containers/associative/multimap/multimap.modifiers/merge.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.modifiers/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_comparator
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::multimap<int, int> src{{1, 0}, {3, 0}, {5, 0}};
@@ -147,4 +146,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/count.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/count.pass.cpp
index 7fb2a90a5..053a771ba 100644
--- a/test/std/containers/associative/multimap/multimap.ops/count.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -173,4 +172,6 @@ int main()
     assert(r == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/count0.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/count0.pass.cpp
index db84dcf7b..75f9f2228 100644
--- a/test/std/containers/associative/multimap/multimap.ops/count0.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/count0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less> M;
@@ -36,4 +35,6 @@ int main()
     typedef std::multimap<int, double, transparent_less_not_referenceable> M;
     assert(M().count(C2Int{5}) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/count1.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/count1.fail.cpp
index 393dd2988..594a424fa 100644
--- a/test/std/containers/associative/multimap/multimap.ops/count1.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/count1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     typedef std::multimap<int, double, transparent_less_no_type> M;
 
diff --git a/test/std/containers/associative/multimap/multimap.ops/count2.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/count2.fail.cpp
index 3fda00765..1f98052b7 100644
--- a/test/std/containers/associative/multimap/multimap.ops/count2.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/count2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     typedef std::multimap<int, double, transparent_less_private> M;
 
diff --git a/test/std/containers/associative/multimap/multimap.ops/count3.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/count3.fail.cpp
index 94453c8f3..3304d9f06 100644
--- a/test/std/containers/associative/multimap/multimap.ops/count3.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/count3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     typedef std::multimap<int, double, transparent_less_not_a_type> M;
 
diff --git a/test/std/containers/associative/multimap/multimap.ops/count_transparent.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/count_transparent.pass.cpp
index a1dbf806a..e6348cbef 100644
--- a/test/std/containers/associative/multimap/multimap.ops/count_transparent.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/count_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,10 +40,12 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::multimap<std::pair<int, int>, int, Comp> s{
       {{2, 1}, 1}, {{1, 1}, 2}, {{1, 1}, 3}, {{1, 1}, 4}, {{2, 2}, 5}};
 
   auto cnt = s.count(1);
   assert(cnt == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/equal_range.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/equal_range.pass.cpp
index 9e67f97f9..3d4997f48 100644
--- a/test/std/containers/associative/multimap/multimap.ops/equal_range.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/equal_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -284,4 +283,6 @@ int main()
     assert(r.second == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/equal_range0.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/equal_range0.pass.cpp
index 0c093898d..c01395f0a 100644
--- a/test/std/containers/associative/multimap/multimap.ops/equal_range0.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/equal_range0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less> M;
@@ -42,4 +41,6 @@ int main()
     P result = example.equal_range(C2Int{5});
     assert(result.first == result.second);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/equal_range1.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/equal_range1.fail.cpp
index 396b49ebc..b826f018f 100644
--- a/test/std/containers/associative/multimap/multimap.ops/equal_range1.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/equal_range1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     typedef std::multimap<int, double, transparent_less_no_type> M;
 
diff --git a/test/std/containers/associative/multimap/multimap.ops/equal_range2.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/equal_range2.fail.cpp
index 1741ee24c..a533a7144 100644
--- a/test/std/containers/associative/multimap/multimap.ops/equal_range2.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/equal_range2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/equal_range3.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/equal_range3.fail.cpp
index f555a31f9..2a26a5849 100644
--- a/test/std/containers/associative/multimap/multimap.ops/equal_range3.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/equal_range3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/equal_range_transparent.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/equal_range_transparent.pass.cpp
index 2b199d23c..95af97cee 100644
--- a/test/std/containers/associative/multimap/multimap.ops/equal_range_transparent.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/equal_range_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::multimap<std::pair<int, int>, int, Comp> s{
       {{2, 1}, 1}, {{1, 1}, 2}, {{1, 1}, 3}, {{1, 1}, 4}, {{2, 2}, 5}};
 
@@ -57,4 +56,6 @@ int main() {
   }
 
   assert(nels == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/find.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/find.pass.cpp
index 474b7b6ac..e526d9a32 100644
--- a/test/std/containers/associative/multimap/multimap.ops/find.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -220,4 +219,6 @@ int main()
     assert(r == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/find0.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/find0.pass.cpp
index 0cff61131..39a8735bc 100644
--- a/test/std/containers/associative/multimap/multimap.ops/find0.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/find0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less> M;
@@ -38,4 +37,6 @@ int main()
     M example;
     assert(example.find(C2Int{5}) == example.end());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/find1.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/find1.fail.cpp
index acea15604..a22d1b5a0 100644
--- a/test/std/containers/associative/multimap/multimap.ops/find1.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/find1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/find2.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/find2.fail.cpp
index 38b77684c..cf2e4b498 100644
--- a/test/std/containers/associative/multimap/multimap.ops/find2.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/find2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/find3.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/find3.fail.cpp
index feb6009ed..2be4062bb 100644
--- a/test/std/containers/associative/multimap/multimap.ops/find3.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/find3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/lower_bound.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/lower_bound.pass.cpp
index 28ff33254..77550b518 100644
--- a/test/std/containers/associative/multimap/multimap.ops/lower_bound.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/lower_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -234,4 +233,6 @@ int main()
     }
 
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/lower_bound0.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/lower_bound0.pass.cpp
index 4a882af4e..1311c9c5a 100644
--- a/test/std/containers/associative/multimap/multimap.ops/lower_bound0.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/lower_bound0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less> M;
@@ -38,4 +37,6 @@ int main()
     M example;
     assert(example.lower_bound(C2Int{5}) == example.end());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/lower_bound1.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/lower_bound1.fail.cpp
index aec942fa0..0279f54bf 100644
--- a/test/std/containers/associative/multimap/multimap.ops/lower_bound1.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/lower_bound1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/lower_bound2.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/lower_bound2.fail.cpp
index 1a856ad84..2282003f4 100644
--- a/test/std/containers/associative/multimap/multimap.ops/lower_bound2.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/lower_bound2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/lower_bound3.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/lower_bound3.fail.cpp
index 4b02c97f8..f5751647a 100644
--- a/test/std/containers/associative/multimap/multimap.ops/lower_bound3.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/lower_bound3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/upper_bound.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/upper_bound.pass.cpp
index 4f4b3884f..762387d80 100644
--- a/test/std/containers/associative/multimap/multimap.ops/upper_bound.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/upper_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "private_constructor.hpp"
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -233,4 +232,6 @@ int main()
     }
 
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/upper_bound0.pass.cpp b/test/std/containers/associative/multimap/multimap.ops/upper_bound0.pass.cpp
index d7618141f..28c9ff75a 100644
--- a/test/std/containers/associative/multimap/multimap.ops/upper_bound0.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/upper_bound0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "is_transparent.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less> M;
@@ -38,4 +37,6 @@ int main()
     M example;
     assert(example.upper_bound(C2Int{5}) == example.end());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.ops/upper_bound1.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/upper_bound1.fail.cpp
index 613194abb..39ecc3cc4 100644
--- a/test/std/containers/associative/multimap/multimap.ops/upper_bound1.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/upper_bound1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_no_type> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/upper_bound2.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/upper_bound2.fail.cpp
index 100a45e5e..f51a199c1 100644
--- a/test/std/containers/associative/multimap/multimap.ops/upper_bound2.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/upper_bound2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_private> M;
diff --git a/test/std/containers/associative/multimap/multimap.ops/upper_bound3.fail.cpp b/test/std/containers/associative/multimap/multimap.ops/upper_bound3.fail.cpp
index b90cd0ac6..68d057100 100644
--- a/test/std/containers/associative/multimap/multimap.ops/upper_bound3.fail.cpp
+++ b/test/std/containers/associative/multimap/multimap.ops/upper_bound3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error "This test requires is C++14 (or later)"
 #else
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double, transparent_less_not_a_type> M;
diff --git a/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp b/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp
index f216f9f76..fe8399713 100644
--- a/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -173,4 +172,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp b/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp
index cef658bab..3e75991ee 100644
--- a/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "../../../test_compare.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const int, double> V;
     {
@@ -278,4 +277,6 @@ int main()
         assert(m2.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/multimap.special/swap_noexcept.pass.cpp b/test/std/containers/associative/multimap/multimap.special/swap_noexcept.pass.cpp
index 8148ea5b2..9d5dab06c 100644
--- a/test/std/containers/associative/multimap/multimap.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/associative/multimap/multimap.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
     {
@@ -138,4 +137,6 @@ int main()
     }
 #endif // _LIBCPP_VERSION
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/scary.pass.cpp b/test/std/containers/associative/multimap/scary.pass.cpp
index e6dc5aaca..faf839b8e 100644
--- a/test/std/containers/associative/multimap/scary.pass.cpp
+++ b/test/std/containers/associative/multimap/scary.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 
 #include <map>
 
-int main()
+int main(int, char**)
 {
     typedef std::map<int, int> M1;
     typedef std::multimap<int, int> M2;
     M2::iterator i;
     M1::iterator j = i;
     ((void)j);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/size.pass.cpp b/test/std/containers/associative/multimap/size.pass.cpp
index 7ba7ceb2b..df18f7b58 100644
--- a/test/std/containers/associative/multimap/size.pass.cpp
+++ b/test/std/containers/associative/multimap/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double> M;
@@ -56,4 +55,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multimap/types.pass.cpp b/test/std/containers/associative/multimap/types.pass.cpp
index 999ecbb7c..67723f5cd 100644
--- a/test/std/containers/associative/multimap/types.pass.cpp
+++ b/test/std/containers/associative/multimap/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multimap<int, double> C;
@@ -67,4 +66,6 @@ int main()
     static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/allocator_mismatch.fail.cpp b/test/std/containers/associative/multiset/allocator_mismatch.fail.cpp
index b2b30d6fd..86e1b307a 100644
--- a/test/std/containers/associative/multiset/allocator_mismatch.fail.cpp
+++ b/test/std/containers/associative/multiset/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <set>
 
-int main()
+int main(int, char**)
 {
     std::multiset<int, std::less<int>, std::allocator<long> > ms;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/clear.pass.cpp b/test/std/containers/associative/multiset/clear.pass.cpp
index 59ee02ece..93f9fef2c 100644
--- a/test/std/containers/associative/multiset/clear.pass.cpp
+++ b/test/std/containers/associative/multiset/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<int> M;
@@ -63,4 +62,6 @@ int main()
         assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/count.pass.cpp b/test/std/containers/associative/multiset/count.pass.cpp
index 863da792a..3ac6f9423 100644
--- a/test/std/containers/associative/multiset/count.pass.cpp
+++ b/test/std/containers/associative/multiset/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -158,4 +157,6 @@ int main()
     assert(r == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/count_transparent.pass.cpp b/test/std/containers/associative/multiset/count_transparent.pass.cpp
index 9ef223345..1239286f7 100644
--- a/test/std/containers/associative/multiset/count_transparent.pass.cpp
+++ b/test/std/containers/associative/multiset/count_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,9 +42,11 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::multiset<std::pair<int, int>, Comp> s{{2, 1}, {1, 1}, {1, 1}, {1, 1}, {2, 2}};
 
   auto cnt = s.count(1);
   assert(cnt == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/emplace.pass.cpp b/test/std/containers/associative/multiset/emplace.pass.cpp
index 7e2628db0..1cabd12fc 100644
--- a/test/std/containers/associative/multiset/emplace.pass.cpp
+++ b/test/std/containers/associative/multiset/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<DefaultOnly> M;
@@ -78,4 +77,6 @@ int main()
         assert(m.size() == 1);
         assert(*r == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/emplace_hint.pass.cpp b/test/std/containers/associative/multiset/emplace_hint.pass.cpp
index 2b9b92d0b..17db3b4b3 100644
--- a/test/std/containers/associative/multiset/emplace_hint.pass.cpp
+++ b/test/std/containers/associative/multiset/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<DefaultOnly> M;
@@ -78,4 +77,6 @@ int main()
         assert(m.size() == 1);
         assert(*r == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/empty.fail.cpp b/test/std/containers/associative/multiset/empty.fail.cpp
index 2169a07e4..4467b4870 100644
--- a/test/std/containers/associative/multiset/empty.fail.cpp
+++ b/test/std/containers/associative/multiset/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::multiset<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/empty.pass.cpp b/test/std/containers/associative/multiset/empty.pass.cpp
index acca4e021..2ca20491f 100644
--- a/test/std/containers/associative/multiset/empty.pass.cpp
+++ b/test/std/containers/associative/multiset/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multiset<int> M;
@@ -40,4 +39,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/equal_range.pass.cpp b/test/std/containers/associative/multiset/equal_range.pass.cpp
index c9f469ba3..44c6c17ec 100644
--- a/test/std/containers/associative/multiset/equal_range.pass.cpp
+++ b/test/std/containers/associative/multiset/equal_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -261,4 +260,6 @@ int main()
     assert(r.second == next(m.begin(), 9));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/equal_range_transparent.pass.cpp b/test/std/containers/associative/multiset/equal_range_transparent.pass.cpp
index ffd87acfd..d052cf169 100644
--- a/test/std/containers/associative/multiset/equal_range_transparent.pass.cpp
+++ b/test/std/containers/associative/multiset/equal_range_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::multiset<std::pair<int, int>, Comp> s{{2, 1}, {1, 1}, {1, 1}, {1, 1}, {2, 2}};
 
   auto er = s.equal_range(1);
@@ -57,4 +56,6 @@ int main() {
   }
 
   assert(nels == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/erase_iter.pass.cpp b/test/std/containers/associative/multiset/erase_iter.pass.cpp
index 8ee45c64c..bcedbf338 100644
--- a/test/std/containers/associative/multiset/erase_iter.pass.cpp
+++ b/test/std/containers/associative/multiset/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct TemplateConstructor
 
 bool operator<(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<int> M;
@@ -200,4 +199,6 @@ int main()
             c.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/erase_iter_iter.pass.cpp b/test/std/containers/associative/multiset/erase_iter_iter.pass.cpp
index 70d347790..03c725285 100644
--- a/test/std/containers/associative/multiset/erase_iter_iter.pass.cpp
+++ b/test/std/containers/associative/multiset/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<int> M;
@@ -138,4 +137,6 @@ int main()
         assert(i == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/erase_key.pass.cpp b/test/std/containers/associative/multiset/erase_key.pass.cpp
index 7293bcfb2..4b1db0529 100644
--- a/test/std/containers/associative/multiset/erase_key.pass.cpp
+++ b/test/std/containers/associative/multiset/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<int> M;
@@ -126,4 +125,6 @@ int main()
         assert(i == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/extract_iterator.pass.cpp b/test/std/containers/associative/multiset/extract_iterator.pass.cpp
index 0f41169e9..ef2a64ede 100644
--- a/test/std/containers/associative/multiset/extract_iterator.pass.cpp
+++ b/test/std/containers/associative/multiset/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using set_type = std::multiset<int>;
@@ -57,4 +56,6 @@ int main()
         min_alloc_set m = {1, 2, 3, 4, 5, 6};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/extract_key.pass.cpp b/test/std/containers/associative/multiset/extract_key.pass.cpp
index 9ad018410..d95667def 100644
--- a/test/std/containers/associative/multiset/extract_key.pass.cpp
+++ b/test/std/containers/associative/multiset/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::multiset<int> m = {1, 2, 3, 4, 5, 6};
@@ -68,4 +67,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/find.pass.cpp b/test/std/containers/associative/multiset/find.pass.cpp
index e20f4f8ce..7a6584b2b 100644
--- a/test/std/containers/associative/multiset/find.pass.cpp
+++ b/test/std/containers/associative/multiset/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -238,4 +237,6 @@ int main()
     assert(r == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/incomplete_type.pass.cpp b/test/std/containers/associative/multiset/incomplete_type.pass.cpp
index aecd77a18..a118a6230 100644
--- a/test/std/containers/associative/multiset/incomplete_type.pass.cpp
+++ b/test/std/containers/associative/multiset/incomplete_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 inline bool operator<(A const& L, A const& R)  { return L.data < R.data; }
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_cv.pass.cpp b/test/std/containers/associative/multiset/insert_cv.pass.cpp
index fe7564282..856d54da0 100644
--- a/test/std/containers/associative/multiset/insert_cv.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void do_insert_cv_test()
     assert(*r == 3);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_cv_test<std::multiset<int> >();
 #if TEST_STD_VER >= 11
@@ -58,4 +57,6 @@ int main()
         do_insert_cv_test<M>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_emplace_allocator_requirements.pass.cpp b/test/std/containers/associative/multiset/insert_emplace_allocator_requirements.pass.cpp
index 4bd2c88f8..083dea739 100644
--- a/test/std/containers/associative/multiset/insert_emplace_allocator_requirements.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_emplace_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,8 +19,10 @@
 #include "container_test_types.h"
 #include "../../set_allocator_requirement_test_templates.h"
 
-int main()
+int main(int, char**)
 {
   testMultisetInsert<TCT::multiset<> >();
   testMultisetEmplace<TCT::multiset<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_initializer_list.pass.cpp b/test/std/containers/associative/multiset/insert_initializer_list.pass.cpp
index 23a65a3cc..7f7a00c15 100644
--- a/test/std/containers/associative/multiset/insert_initializer_list.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multiset<int> C;
@@ -57,4 +56,6 @@ int main()
     assert(*++i == V(8));
     assert(*++i == V(10));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_iter_cv.pass.cpp b/test/std/containers/associative/multiset/insert_iter_cv.pass.cpp
index ca08bacad..e29e7b484 100644
--- a/test/std/containers/associative/multiset/insert_iter_cv.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_iter_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<int> M;
@@ -70,4 +69,6 @@ int main()
         assert(*r == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_iter_iter.pass.cpp b/test/std/containers/associative/multiset/insert_iter_iter.pass.cpp
index fb664d74e..242b9d7f6 100644
--- a/test/std/containers/associative/multiset/insert_iter_iter.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<int> M;
@@ -82,4 +81,6 @@ int main()
         assert(*next(m.begin(), 8) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_iter_rv.pass.cpp b/test/std/containers/associative/multiset/insert_iter_rv.pass.cpp
index f39fca5c8..e905c5c40 100644
--- a/test/std/containers/associative/multiset/insert_iter_rv.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_iter_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<MoveOnly> M;
@@ -71,4 +70,6 @@ int main()
         assert(m.size() == 4);
         assert(*r == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_node_type.pass.cpp b/test/std/containers/associative/multiset/insert_node_type.pass.cpp
index ca51ec9f0..7cf2cebfb 100644
--- a/test/std/containers/associative/multiset/insert_node_type.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,10 +67,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::multiset<int> m;
     test(m);
     std::multiset<int, std::less<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp b/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp
index 9d0af0653..d4d6871fb 100644
--- a/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,10 +49,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::multiset<int> m;
     test(m);
     std::multiset<int, std::less<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/insert_rv.pass.cpp b/test/std/containers/associative/multiset/insert_rv.pass.cpp
index 68d348793..3f73a2813 100644
--- a/test/std/containers/associative/multiset/insert_rv.pass.cpp
+++ b/test/std/containers/associative/multiset/insert_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<MoveOnly> M;
@@ -71,4 +70,6 @@ int main()
         assert(m.size() == 4);
         assert(*r == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/iterator.pass.cpp b/test/std/containers/associative/multiset/iterator.pass.cpp
index ec17689f2..4ab1d79a0 100644
--- a/test/std/containers/associative/multiset/iterator.pass.cpp
+++ b/test/std/containers/associative/multiset/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -214,4 +213,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/lower_bound.pass.cpp b/test/std/containers/associative/multiset/lower_bound.pass.cpp
index f5ce8e533..6d31f04c8 100644
--- a/test/std/containers/associative/multiset/lower_bound.pass.cpp
+++ b/test/std/containers/associative/multiset/lower_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -221,4 +220,6 @@ int main()
     assert(r == next(m.begin(), 9));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/max_size.pass.cpp b/test/std/containers/associative/multiset/max_size.pass.cpp
index 8c5b15e39..5986df295 100644
--- a/test/std/containers/associative/multiset/max_size.pass.cpp
+++ b/test/std/containers/associative/multiset/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
       typedef limited_allocator<int, 10> A;
@@ -47,4 +46,6 @@ int main()
       assert(c.max_size() <= max_dist);
       assert(c.max_size() <= alloc_max_size(c.get_allocator()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/merge.pass.cpp b/test/std/containers/associative/multiset/merge.pass.cpp
index 8ab992889..e7e05b155 100644
--- a/test/std/containers/associative/multiset/merge.pass.cpp
+++ b/test/std/containers/associative/multiset/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_comparator
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::multiset<int> src{1, 3, 5};
@@ -146,4 +145,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/alloc.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/alloc.pass.cpp
index 0a7572275..9ceac884b 100644
--- a/test/std/containers/associative/multiset/multiset.cons/alloc.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::less<int> C;
     typedef test_allocator<int> A;
@@ -26,4 +25,6 @@ int main()
     assert(m.empty());
     assert(m.begin() == m.end());
     assert(m.get_allocator() == A(5));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/assign_initializer_list.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/assign_initializer_list.pass.cpp
index 915a15fc6..c84b04293 100644
--- a/test/std/containers/associative/multiset/multiset.cons/assign_initializer_list.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multiset<int> C;
@@ -52,4 +51,6 @@ int main()
     assert(*++i == V(5));
     assert(*++i == V(6));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/compare.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/compare.pass.cpp
index 26ca80120..d35de106f 100644
--- a/test/std/containers/associative/multiset/multiset.cons/compare.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef test_compare<std::less<int> > C;
     const std::multiset<int, C> m(C(3));
@@ -30,4 +29,6 @@ int main()
     assert(m.begin() == m.end());
     assert(m.key_comp() == C(3));
     assert(m.value_comp() == C(3));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/compare_alloc.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/compare_alloc.pass.cpp
index 76c9f8b2a..f044b2790 100644
--- a/test/std/containers/associative/multiset/multiset.cons/compare_alloc.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef test_compare<std::less<int> > C;
     typedef test_allocator<int> A;
@@ -28,4 +27,6 @@ int main()
     assert(m.begin() == m.end());
     assert(m.key_comp() == C(4));
     assert(m.get_allocator() == A(5));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/compare_copy_constructible.fail.cpp b/test/std/containers/associative/multiset/multiset.cons/compare_copy_constructible.fail.cpp
index 4f9a6d61b..ae987c64c 100644
--- a/test/std/containers/associative/multiset/multiset.cons/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::multiset<int, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/copy.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/copy.pass.cpp
index 6349dde1e..ac196b5ae 100644
--- a/test/std/containers/associative/multiset/multiset.cons/copy.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -116,4 +115,6 @@ int main()
         assert(*next(mo.begin(), 8) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/copy_alloc.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/copy_alloc.pass.cpp
index 04a769e73..25e6d6efb 100644
--- a/test/std/containers/associative/multiset/multiset.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef int V;
     V ar[] =
@@ -65,4 +64,6 @@ int main()
     assert(*next(mo.begin(), 6) == 3);
     assert(*next(mo.begin(), 7) == 3);
     assert(*next(mo.begin(), 8) == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/copy_assign.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/copy_assign.pass.cpp
index cca636325..7992c7cae 100644
--- a/test/std/containers/associative/multiset/multiset.cons/copy_assign.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -135,4 +134,6 @@ int main()
         assert(*next(mo.begin(), 7) == 3);
         assert(*next(mo.begin(), 8) == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/default.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/default.pass.cpp
index b5e063e94..88c5244f8 100644
--- a/test/std/containers/associative/multiset/multiset.cons/default.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::multiset<int> m;
@@ -51,4 +50,6 @@ int main()
     assert(m.begin() == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/default_noexcept.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/default_noexcept.pass.cpp
index 315600323..7fa25ac47 100644
--- a/test/std/containers/associative/multiset/multiset.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -54,4 +53,6 @@ int main()
         typedef std::multiset<MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/dtor_noexcept.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/dtor_noexcept.pass.cpp
index 096696fcd..8a18a2977 100644
--- a/test/std/containers/associative/multiset/multiset.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<MoveOnly> C;
@@ -48,4 +47,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/initializer_list.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/initializer_list.pass.cpp
index f3ee002dc..68a74e80c 100644
--- a/test/std/containers/associative/multiset/multiset.cons/initializer_list.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multiset<int> C;
@@ -67,4 +66,6 @@ int main()
     assert(*++i == V(6));
     assert(m.get_allocator() == a);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare.pass.cpp
index 3312ca138..cf4c11dcf 100644
--- a/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef test_compare<std::less<int> > Cmp;
     typedef std::multiset<int, Cmp> C;
@@ -35,4 +34,6 @@ int main()
     assert(*++i == V(5));
     assert(*++i == V(6));
     assert(m.key_comp() == Cmp(10));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare_alloc.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare_alloc.pass.cpp
index e495fce13..5f26864cd 100644
--- a/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare_alloc.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/initializer_list_compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef test_compare<std::less<int> > Cmp;
     typedef test_allocator<int> A;
@@ -38,4 +37,6 @@ int main()
     assert(*++i == V(6));
     assert(m.key_comp() == Cmp(10));
     assert(m.get_allocator() == A(4));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/iter_iter.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/iter_iter.pass.cpp
index ebe8353ba..9d521c279 100644
--- a/test/std/containers/associative/multiset/multiset.cons/iter_iter.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -80,4 +79,6 @@ int main()
     assert(*next(m.begin(), 8) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/iter_iter_alloc.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/iter_iter_alloc.pass.cpp
index 8a6cf4541..82d9f4aea 100644
--- a/test/std/containers/associative/multiset/multiset.cons/iter_iter_alloc.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/iter_iter_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -92,4 +91,6 @@ int main()
     assert(m.get_allocator() == a);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/iter_iter_comp.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/iter_iter_comp.pass.cpp
index 0bbaaf12e..25b4364c1 100644
--- a/test/std/containers/associative/multiset/multiset.cons/iter_iter_comp.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/iter_iter_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef int V;
     V ar[] =
@@ -50,4 +49,6 @@ int main()
     assert(*next(m.begin(), 6) == 3);
     assert(*next(m.begin(), 7) == 3);
     assert(*next(m.begin(), 8) == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/move.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/move.pass.cpp
index 7a43cc1c6..0d6cc72a6 100644
--- a/test/std/containers/associative/multiset/multiset.cons/move.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -114,4 +113,6 @@ int main()
         assert(mo.size() == 0);
         assert(distance(mo.begin(), mo.end()) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp
index 29797c3ee..3727c143d 100644
--- a/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,12 +17,13 @@
 #include <set>
 #include <cassert>
 
+#include "test_macros.h"
 #include "MoveOnly.h"
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 #include "Counter.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly V;
@@ -61,7 +61,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(7));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef MoveOnly V;
@@ -99,7 +99,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef MoveOnly V;
@@ -137,7 +137,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef Counter<int> V;
@@ -171,17 +171,22 @@ int main()
 
             M m3(std::move(m1), A());
             assert(m3 == m2);
-            assert(m1.empty());
-            assert(Counter_base::gConstructed == 3*num);
+            LIBCPP_ASSERT(m1.empty());
+            assert(Counter_base::gConstructed >= (int)(3*num));
+            assert(Counter_base::gConstructed <= (int)(4*num));
 
             {
             M m4(std::move(m2), A(5));
-            assert(Counter_base::gConstructed == 3*num);
+            assert(Counter_base::gConstructed >= (int)(3*num));
+            assert(Counter_base::gConstructed <= (int)(5*num));
             assert(m4 == m3);
-            assert(m2.empty());
+            LIBCPP_ASSERT(m2.empty());
             }
-            assert(Counter_base::gConstructed == 2*num);
+            assert(Counter_base::gConstructed >= (int)(2*num));
+            assert(Counter_base::gConstructed <= (int)(4*num));
         }
         assert(Counter_base::gConstructed == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/move_assign.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/move_assign.pass.cpp
index e767ff1a4..6f584f22c 100644
--- a/test/std/containers/associative/multiset/multiset.cons/move_assign.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly V;
@@ -181,4 +180,6 @@ int main()
         assert(m3.key_comp() == C(5));
         assert(m1.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/move_assign_noexcept.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/move_assign_noexcept.pass.cpp
index 18d64bc5f..026fc1ba7 100644
--- a/test/std/containers/associative/multiset/multiset.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<MoveOnly> C;
@@ -54,4 +53,6 @@ int main()
         typedef std::multiset<MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.cons/move_noexcept.pass.cpp b/test/std/containers/associative/multiset/multiset.cons/move_noexcept.pass.cpp
index eab1787ec..88bbb59a4 100644
--- a/test/std/containers/associative/multiset/multiset.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -52,4 +51,6 @@ int main()
         typedef std::multiset<MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp b/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp
index 3c619bb68..84d665cb1 100644
--- a/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,3}), False, S({1,2,3}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::multiset<int>>();
     test<std::multiset<int, std::less<int>, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::multiset<long>>();
     test<std::multiset<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp b/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp
index 7036138f8..9ac0f1709 100644
--- a/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -174,4 +173,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp b/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp
index faa0818cf..a3bbf551d 100644
--- a/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_allocator.h"
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef int V;
     {
@@ -164,4 +163,6 @@ int main()
         assert(m2.key_comp() == C(1));
         assert(m2.get_allocator() == A(1));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/multiset.special/swap_noexcept.pass.cpp b/test/std/containers/associative/multiset/multiset.special/swap_noexcept.pass.cpp
index 9693ffb15..47a0d411f 100644
--- a/test/std/containers/associative/multiset/multiset.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/associative/multiset/multiset.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::multiset<MoveOnly> C;
@@ -137,4 +136,6 @@ int main()
     }
 #endif // _LIBCPP_VERSION
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/scary.pass.cpp b/test/std/containers/associative/multiset/scary.pass.cpp
index bc4328b53..5065ab96e 100644
--- a/test/std/containers/associative/multiset/scary.pass.cpp
+++ b/test/std/containers/associative/multiset/scary.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 
 #include <set>
 
-int main()
+int main(int, char**)
 {
     typedef std::set<int> M1;
     typedef std::multiset<int> M2;
     M2::iterator i;
     M1::iterator j = i;
     ((void)j);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/size.pass.cpp b/test/std/containers/associative/multiset/size.pass.cpp
index d11975b79..bb5616e9a 100644
--- a/test/std/containers/associative/multiset/size.pass.cpp
+++ b/test/std/containers/associative/multiset/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multiset<int> M;
@@ -56,4 +55,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/types.pass.cpp b/test/std/containers/associative/multiset/types.pass.cpp
index b37b9b328..96e8ec4f0 100644
--- a/test/std/containers/associative/multiset/types.pass.cpp
+++ b/test/std/containers/associative/multiset/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::multiset<int> C;
@@ -67,4 +66,6 @@ int main()
     static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/multiset/upper_bound.pass.cpp b/test/std/containers/associative/multiset/upper_bound.pass.cpp
index 8bd00e2f3..99a7e374d 100644
--- a/test/std/containers/associative/multiset/upper_bound.pass.cpp
+++ b/test/std/containers/associative/multiset/upper_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -220,4 +219,6 @@ int main()
     assert(r == next(m.begin(), 9));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/allocator_mismatch.fail.cpp b/test/std/containers/associative/set/allocator_mismatch.fail.cpp
index 6905d9344..69e49351e 100644
--- a/test/std/containers/associative/set/allocator_mismatch.fail.cpp
+++ b/test/std/containers/associative/set/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <set>
 
-int main()
+int main(int, char**)
 {
     std::set<int, std::less<int>, std::allocator<long> > s;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/clear.pass.cpp b/test/std/containers/associative/set/clear.pass.cpp
index 1be3ed2b8..0650e912f 100644
--- a/test/std/containers/associative/set/clear.pass.cpp
+++ b/test/std/containers/associative/set/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<int> M;
@@ -63,4 +62,6 @@ int main()
         assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/count.pass.cpp b/test/std/containers/associative/set/count.pass.cpp
index 115b4fbc2..8866aa7f0 100644
--- a/test/std/containers/associative/set/count.pass.cpp
+++ b/test/std/containers/associative/set/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -168,4 +167,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/count_transparent.pass.cpp b/test/std/containers/associative/set/count_transparent.pass.cpp
index 26908eacd..d94188def 100644
--- a/test/std/containers/associative/set/count_transparent.pass.cpp
+++ b/test/std/containers/associative/set/count_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,9 +42,11 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::set<std::pair<int, int>, Comp> s{{2, 1}, {1, 2}, {1, 3}, {1, 4}, {2, 2}};
 
   auto cnt = s.count(1);
   assert(cnt == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/emplace.pass.cpp b/test/std/containers/associative/set/emplace.pass.cpp
index 5d50a2435..e48f2e1e4 100644
--- a/test/std/containers/associative/set/emplace.pass.cpp
+++ b/test/std/containers/associative/set/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<DefaultOnly> M;
@@ -85,4 +84,6 @@ int main()
         assert(m.size() == 1);
         assert(*r.first == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/emplace_hint.pass.cpp b/test/std/containers/associative/set/emplace_hint.pass.cpp
index 8962c0cbd..a7ed7266b 100644
--- a/test/std/containers/associative/set/emplace_hint.pass.cpp
+++ b/test/std/containers/associative/set/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<DefaultOnly> M;
@@ -78,4 +77,6 @@ int main()
         assert(m.size() == 1);
         assert(*r == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/empty.fail.cpp b/test/std/containers/associative/set/empty.fail.cpp
index 0eea6fb67..fc5856fbd 100644
--- a/test/std/containers/associative/set/empty.fail.cpp
+++ b/test/std/containers/associative/set/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::set<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/empty.pass.cpp b/test/std/containers/associative/set/empty.pass.cpp
index 1eaa8fc90..c00ab68ff 100644
--- a/test/std/containers/associative/set/empty.pass.cpp
+++ b/test/std/containers/associative/set/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::set<int> M;
@@ -40,4 +39,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/equal_range.pass.cpp b/test/std/containers/associative/set/equal_range.pass.cpp
index 53fe895bd..5c4370611 100644
--- a/test/std/containers/associative/set/equal_range.pass.cpp
+++ b/test/std/containers/associative/set/equal_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -368,4 +367,6 @@ int main()
     assert(r.second == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/equal_range_transparent.pass.cpp b/test/std/containers/associative/set/equal_range_transparent.pass.cpp
index 88030847a..b69ff2d52 100644
--- a/test/std/containers/associative/set/equal_range_transparent.pass.cpp
+++ b/test/std/containers/associative/set/equal_range_transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct Comp {
   }
 };
 
-int main() {
+int main(int, char**) {
   std::set<std::pair<int, int>, Comp> s{{2, 1}, {1, 2}, {1, 3}, {1, 4}, {2, 2}};
 
   auto er = s.equal_range(1);
@@ -57,4 +56,6 @@ int main() {
   }
 
   assert(nels == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/erase_iter.pass.cpp b/test/std/containers/associative/set/erase_iter.pass.cpp
index 85be1f5b9..49ce4f29e 100644
--- a/test/std/containers/associative/set/erase_iter.pass.cpp
+++ b/test/std/containers/associative/set/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct TemplateConstructor
 
 bool operator<(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<int> M;
@@ -200,4 +199,6 @@ int main()
             c.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/erase_iter_iter.pass.cpp b/test/std/containers/associative/set/erase_iter_iter.pass.cpp
index 775e6cea0..86fd52c2c 100644
--- a/test/std/containers/associative/set/erase_iter_iter.pass.cpp
+++ b/test/std/containers/associative/set/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<int> M;
@@ -138,4 +137,6 @@ int main()
         assert(i == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/erase_key.pass.cpp b/test/std/containers/associative/set/erase_key.pass.cpp
index 6fc15d9cc..3ceec8850 100644
--- a/test/std/containers/associative/set/erase_key.pass.cpp
+++ b/test/std/containers/associative/set/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<int> M;
@@ -200,4 +199,6 @@ int main()
         assert(i == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/extract_iterator.pass.cpp b/test/std/containers/associative/set/extract_iterator.pass.cpp
index ffcf71486..1ba13e318 100644
--- a/test/std/containers/associative/set/extract_iterator.pass.cpp
+++ b/test/std/containers/associative/set/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using set_type = std::set<int>;
@@ -57,4 +56,6 @@ int main()
         min_alloc_set m = {1, 2, 3, 4, 5, 6};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/extract_key.pass.cpp b/test/std/containers/associative/set/extract_key.pass.cpp
index 1fb7ab911..4417e8636 100644
--- a/test/std/containers/associative/set/extract_key.pass.cpp
+++ b/test/std/containers/associative/set/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::set<int> m = {1, 2, 3, 4, 5, 6};
@@ -68,4 +67,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/find.pass.cpp b/test/std/containers/associative/set/find.pass.cpp
index fa1e54740..cda1ea87a 100644
--- a/test/std/containers/associative/set/find.pass.cpp
+++ b/test/std/containers/associative/set/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -238,4 +237,6 @@ int main()
     assert(r == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/gcc_workaround.pass.cpp b/test/std/containers/associative/set/gcc_workaround.pass.cpp
new file mode 100644
index 000000000..23db04405
--- /dev/null
+++ b/test/std/containers/associative/set/gcc_workaround.pass.cpp
@@ -0,0 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Tests workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37804
+
+#include <set>
+std::set<int> s;
+#include <map>
+using std::map;
+using std::multimap;
+
+int main(int, char**) { return 0; }
diff --git a/test/std/containers/associative/set/incomplete_type.pass.cpp b/test/std/containers/associative/set/incomplete_type.pass.cpp
index a20022305..d3b93c599 100644
--- a/test/std/containers/associative/set/incomplete_type.pass.cpp
+++ b/test/std/containers/associative/set/incomplete_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 inline bool operator<(A const& L, A const& R)  { return L.data < R.data; }
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_and_emplace_allocator_requirements.pass.cpp b/test/std/containers/associative/set/insert_and_emplace_allocator_requirements.pass.cpp
index b14340b1d..11be14b02 100644
--- a/test/std/containers/associative/set/insert_and_emplace_allocator_requirements.pass.cpp
+++ b/test/std/containers/associative/set/insert_and_emplace_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,9 +20,11 @@
 #include "container_test_types.h"
 #include "../../set_allocator_requirement_test_templates.h"
 
-int main()
+int main(int, char**)
 {
   testSetInsert<TCT::set<> >();
   testSetEmplace<TCT::set<> >();
   testSetEmplaceHint<TCT::set<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_cv.pass.cpp b/test/std/containers/associative/set/insert_cv.pass.cpp
index 17d3c2623..a97e76eb5 100644
--- a/test/std/containers/associative/set/insert_cv.pass.cpp
+++ b/test/std/containers/associative/set/insert_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ void do_insert_cv_test()
     assert(*r.first == 3);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_cv_test<std::set<int> >();
 #if TEST_STD_VER >= 11
@@ -63,4 +62,6 @@ int main()
         do_insert_cv_test<M>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_initializer_list.pass.cpp b/test/std/containers/associative/set/insert_initializer_list.pass.cpp
index 3114d48ab..ce5cc6fd2 100644
--- a/test/std/containers/associative/set/insert_initializer_list.pass.cpp
+++ b/test/std/containers/associative/set/insert_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::set<int> C;
@@ -57,4 +56,6 @@ int main()
     assert(*++i == V(8));
     assert(*++i == V(10));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_iter_cv.pass.cpp b/test/std/containers/associative/set/insert_iter_cv.pass.cpp
index 12d6402a8..be27e5e4e 100644
--- a/test/std/containers/associative/set/insert_iter_cv.pass.cpp
+++ b/test/std/containers/associative/set/insert_iter_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<int> M;
@@ -70,4 +69,6 @@ int main()
         assert(*r == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_iter_iter.pass.cpp b/test/std/containers/associative/set/insert_iter_iter.pass.cpp
index 46edd0db0..35c2dca30 100644
--- a/test/std/containers/associative/set/insert_iter_iter.pass.cpp
+++ b/test/std/containers/associative/set/insert_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<int> M;
@@ -70,4 +69,6 @@ int main()
         assert(*next(m.begin(), 2) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_iter_rv.pass.cpp b/test/std/containers/associative/set/insert_iter_rv.pass.cpp
index 9579988c0..08eba9fe6 100644
--- a/test/std/containers/associative/set/insert_iter_rv.pass.cpp
+++ b/test/std/containers/associative/set/insert_iter_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<MoveOnly> M;
@@ -71,4 +70,6 @@ int main()
         assert(m.size() == 3);
         assert(*r == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_node_type.pass.cpp b/test/std/containers/associative/set/insert_node_type.pass.cpp
index 4186f20e7..188aea2bb 100644
--- a/test/std/containers/associative/set/insert_node_type.pass.cpp
+++ b/test/std/containers/associative/set/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,10 +73,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::set<int> m;
     test(m);
     std::set<int, std::less<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_node_type_hint.pass.cpp b/test/std/containers/associative/set/insert_node_type_hint.pass.cpp
index 761ceef6a..6e8c14099 100644
--- a/test/std/containers/associative/set/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/associative/set/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,10 +51,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::set<int> m;
     test(m);
     std::set<int, std::less<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/insert_rv.pass.cpp b/test/std/containers/associative/set/insert_rv.pass.cpp
index 25cbfcb88..092fd8a71 100644
--- a/test/std/containers/associative/set/insert_rv.pass.cpp
+++ b/test/std/containers/associative/set/insert_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<MoveOnly> M;
@@ -79,4 +78,6 @@ int main()
         assert(m.size() == 3);
         assert(*r.first == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/iterator.pass.cpp b/test/std/containers/associative/set/iterator.pass.cpp
index be0a1578d..da0f9a7b9 100644
--- a/test/std/containers/associative/set/iterator.pass.cpp
+++ b/test/std/containers/associative/set/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -210,4 +209,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/lower_bound.pass.cpp b/test/std/containers/associative/set/lower_bound.pass.cpp
index 8dfe537b2..9a25950a8 100644
--- a/test/std/containers/associative/set/lower_bound.pass.cpp
+++ b/test/std/containers/associative/set/lower_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -335,4 +334,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/max_size.pass.cpp b/test/std/containers/associative/set/max_size.pass.cpp
index 8be84046e..e37bfe714 100644
--- a/test/std/containers/associative/set/max_size.pass.cpp
+++ b/test/std/containers/associative/set/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
       typedef limited_allocator<int, 10> A;
@@ -47,4 +46,6 @@ int main()
       assert(c.max_size() <= max_dist);
       assert(c.max_size() <= alloc_max_size(c.get_allocator()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/merge.pass.cpp b/test/std/containers/associative/set/merge.pass.cpp
index bbae22c77..62e76ba06 100644
--- a/test/std/containers/associative/set/merge.pass.cpp
+++ b/test/std/containers/associative/set/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_comparator
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::set<int> src{1, 3, 5};
@@ -146,4 +145,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/alloc.pass.cpp b/test/std/containers/associative/set/set.cons/alloc.pass.cpp
index 67433ff88..591b28c18 100644
--- a/test/std/containers/associative/set/set.cons/alloc.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::less<int> C;
     typedef test_allocator<int> A;
@@ -26,4 +25,6 @@ int main()
     assert(m.empty());
     assert(m.begin() == m.end());
     assert(m.get_allocator() == A(5));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/assign_initializer_list.pass.cpp b/test/std/containers/associative/set/set.cons/assign_initializer_list.pass.cpp
index 9906a1c0b..0127b1d81 100644
--- a/test/std/containers/associative/set/set.cons/assign_initializer_list.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::set<int> C;
@@ -52,4 +51,6 @@ int main()
     assert(*++i == V(5));
     assert(*++i == V(6));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/compare.pass.cpp b/test/std/containers/associative/set/set.cons/compare.pass.cpp
index 0dac363ca..a4e9718e2 100644
--- a/test/std/containers/associative/set/set.cons/compare.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef test_compare<std::less<int> > C;
     const std::set<int, C> m(C(3));
@@ -30,4 +29,6 @@ int main()
     assert(m.begin() == m.end());
     assert(m.key_comp() == C(3));
     assert(m.value_comp() == C(3));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/compare_alloc.pass.cpp b/test/std/containers/associative/set/set.cons/compare_alloc.pass.cpp
index 22b3328d4..41c7d0289 100644
--- a/test/std/containers/associative/set/set.cons/compare_alloc.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef test_compare<std::less<int> > C;
     typedef test_allocator<int> A;
@@ -28,4 +27,6 @@ int main()
     assert(m.begin() == m.end());
     assert(m.key_comp() == C(4));
     assert(m.get_allocator() == A(5));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/compare_copy_constructible.fail.cpp b/test/std/containers/associative/set/set.cons/compare_copy_constructible.fail.cpp
index 94ce9cd55..58f678dd1 100644
--- a/test/std/containers/associative/set/set.cons/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/associative/set/set.cons/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::set<int, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/copy.pass.cpp b/test/std/containers/associative/set/set.cons/copy.pass.cpp
index 7bd6342fc..2e256aa17 100644
--- a/test/std/containers/associative/set/set.cons/copy.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -92,4 +91,6 @@ int main()
         assert(*next(mo.begin(), 2) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/copy_alloc.pass.cpp b/test/std/containers/associative/set/set.cons/copy_alloc.pass.cpp
index 1ad03dc14..6b1010c33 100644
--- a/test/std/containers/associative/set/set.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef int V;
     V ar[] =
@@ -53,4 +52,6 @@ int main()
     assert(*mo.begin() == 1);
     assert(*next(mo.begin()) == 2);
     assert(*next(mo.begin(), 2) == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/copy_assign.pass.cpp b/test/std/containers/associative/set/set.cons/copy_assign.pass.cpp
index 7f0f04476..c1f37f83d 100644
--- a/test/std/containers/associative/set/set.cons/copy_assign.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -106,4 +105,6 @@ int main()
         assert(*next(mo.begin()) == 2);
         assert(*next(mo.begin(), 2) == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/default.pass.cpp b/test/std/containers/associative/set/set.cons/default.pass.cpp
index 3310c51ed..88dc3a262 100644
--- a/test/std/containers/associative/set/set.cons/default.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::set<int> m;
@@ -51,4 +50,6 @@ int main()
     assert(m.begin() == m.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/default_noexcept.pass.cpp b/test/std/containers/associative/set/set.cons/default_noexcept.pass.cpp
index d32cc3f48..0305e20f2 100644
--- a/test/std/containers/associative/set/set.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -54,4 +53,6 @@ int main()
         typedef std::set<MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/dtor_noexcept.pass.cpp b/test/std/containers/associative/set/set.cons/dtor_noexcept.pass.cpp
index c91038e39..a06a47168 100644
--- a/test/std/containers/associative/set/set.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<MoveOnly> C;
@@ -48,4 +47,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/initializer_list.pass.cpp b/test/std/containers/associative/set/set.cons/initializer_list.pass.cpp
index 31521b2f3..e4742bbda 100644
--- a/test/std/containers/associative/set/set.cons/initializer_list.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::set<int> C;
@@ -50,4 +49,6 @@ int main()
     assert(*++i == V(5));
     assert(*++i == V(6));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/initializer_list_compare.pass.cpp b/test/std/containers/associative/set/set.cons/initializer_list_compare.pass.cpp
index ea72b6dc0..cf4b78af9 100644
--- a/test/std/containers/associative/set/set.cons/initializer_list_compare.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/initializer_list_compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef test_compare<std::less<int> > Cmp;
     typedef std::set<int, Cmp> C;
@@ -35,4 +34,6 @@ int main()
     assert(*++i == V(5));
     assert(*++i == V(6));
     assert(m.key_comp() == Cmp(10));
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/initializer_list_compare_alloc.pass.cpp b/test/std/containers/associative/set/set.cons/initializer_list_compare_alloc.pass.cpp
index f6cb734c3..161cdd8c1 100644
--- a/test/std/containers/associative/set/set.cons/initializer_list_compare_alloc.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/initializer_list_compare_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_compare<std::less<int> > Cmp;
@@ -59,4 +58,6 @@ int main()
     assert(*++i == V(6));
     assert(m.get_allocator() == A(4));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/iter_iter.pass.cpp b/test/std/containers/associative/set/set.cons/iter_iter.pass.cpp
index db765bd9e..25143a7df 100644
--- a/test/std/containers/associative/set/set.cons/iter_iter.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -68,4 +67,6 @@ int main()
     assert(*next(m.begin(), 2) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/iter_iter_alloc.pass.cpp b/test/std/containers/associative/set/set.cons/iter_iter_alloc.pass.cpp
index 13eccbe2a..bf8b97098 100644
--- a/test/std/containers/associative/set/set.cons/iter_iter_alloc.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/iter_iter_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -84,4 +83,6 @@ int main()
     assert(m.get_allocator() == a);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/iter_iter_comp.pass.cpp b/test/std/containers/associative/set/set.cons/iter_iter_comp.pass.cpp
index 18bc08390..f9c2e4a98 100644
--- a/test/std/containers/associative/set/set.cons/iter_iter_comp.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/iter_iter_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_iterators.h"
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef int V;
     V ar[] =
@@ -44,4 +43,6 @@ int main()
     assert(*m.begin() == 1);
     assert(*next(m.begin()) == 2);
     assert(*next(m.begin(), 2) == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/move.pass.cpp b/test/std/containers/associative/set/set.cons/move.pass.cpp
index ff87799b9..516274efc 100644
--- a/test/std/containers/associative/set/set.cons/move.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int V;
@@ -102,4 +101,6 @@ int main()
         assert(mo.size() == 0);
         assert(distance(mo.begin(), mo.end()) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp b/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp
index 9e1cd816b..63ec29689 100644
--- a/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,12 +17,13 @@
 #include <set>
 #include <cassert>
 
+#include "test_macros.h"
 #include "MoveOnly.h"
 #include "../../../test_compare.h"
 #include "test_allocator.h"
 #include "Counter.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly V;
@@ -61,7 +61,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(7));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef MoveOnly V;
@@ -99,7 +99,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef MoveOnly V;
@@ -137,7 +137,7 @@ int main()
         assert(m3 == m2);
         assert(m3.get_allocator() == A(5));
         assert(m3.key_comp() == C(5));
-        assert(m1.empty());
+        LIBCPP_ASSERT(m1.empty());
     }
     {
         typedef Counter<int> V;
@@ -171,18 +171,23 @@ int main()
 
             M m3(std::move(m1), A());
             assert(m3 == m2);
-            assert(m1.empty());
-            assert(Counter_base::gConstructed == 6+num);
+            LIBCPP_ASSERT(m1.empty());
+            assert(Counter_base::gConstructed >= (int)(6+num));
+            assert(Counter_base::gConstructed <= (int)(m1.size()+6+num));
 
             {
             M m4(std::move(m2), A(5));
-            assert(Counter_base::gConstructed == 6+num);
+            assert(Counter_base::gConstructed >= (int)(6+num));
+            assert(Counter_base::gConstructed <= (int)(m1.size()+m2.size()+6+num));
             assert(m4 == m3);
-            assert(m2.empty());
+            LIBCPP_ASSERT(m2.empty());
             }
-            assert(Counter_base::gConstructed == 3+num);
+            assert(Counter_base::gConstructed >= (int)(3+num));
+            assert(Counter_base::gConstructed <= (int)(m1.size()+m2.size()+3+num));
         }
         assert(Counter_base::gConstructed == 0);
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/move_assign.pass.cpp b/test/std/containers/associative/set/set.cons/move_assign.pass.cpp
index 7862f7bf7..ba5c767f3 100644
--- a/test/std/containers/associative/set/set.cons/move_assign.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly V;
@@ -181,4 +180,6 @@ int main()
         assert(m3.key_comp() == C(5));
         assert(m1.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/move_assign_noexcept.pass.cpp b/test/std/containers/associative/set/set.cons/move_assign_noexcept.pass.cpp
index c07d4e6f9..f6e3c9f32 100644
--- a/test/std/containers/associative/set/set.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<MoveOnly> C;
@@ -54,4 +53,6 @@ int main()
         typedef std::set<MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.cons/move_noexcept.pass.cpp b/test/std/containers/associative/set/set.cons/move_noexcept.pass.cpp
index 901fdbdb3..2bcd26de6 100644
--- a/test/std/containers/associative/set/set.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/associative/set/set.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct some_comp
     bool operator()(const T&, const T&) const { return false; }
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -52,4 +51,6 @@ int main()
         typedef std::set<MoveOnly, some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp b/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp
index a55a38c2d..43a60d79c 100644
--- a/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp
+++ b/test/std/containers/associative/set/set.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -56,7 +55,7 @@ void test()
     test0(S({1,2,3}), False, S({1,2,3}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::set<int>>();
     test<std::set<int, std::less<int>, min_allocator<int>>> ();
@@ -64,4 +63,6 @@ int main()
 
     test<std::set<long>>();
     test<std::set<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.special/member_swap.pass.cpp b/test/std/containers/associative/set/set.special/member_swap.pass.cpp
index 486d5f442..455c34ec8 100644
--- a/test/std/containers/associative/set/set.special/member_swap.pass.cpp
+++ b/test/std/containers/associative/set/set.special/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -174,4 +173,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp b/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp
index 0af481870..b111de9ca 100644
--- a/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp
+++ b/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_allocator.h"
 #include "../../../test_compare.h"
 
-int main()
+int main(int, char**)
 {
     typedef int V;
     {
@@ -164,4 +163,6 @@ int main()
         assert(m2.key_comp() == C(1));
         assert(m2.get_allocator() == A(1));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/set.special/swap_noexcept.pass.cpp b/test/std/containers/associative/set/set.special/swap_noexcept.pass.cpp
index 38b0ab815..9fd68f663 100644
--- a/test/std/containers/associative/set/set.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/associative/set/set.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::set<MoveOnly> C;
@@ -138,4 +137,6 @@ int main()
 #endif // _LIBCPP_VERSION
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/size.pass.cpp b/test/std/containers/associative/set/size.pass.cpp
index 853aeca74..b73d83376 100644
--- a/test/std/containers/associative/set/size.pass.cpp
+++ b/test/std/containers/associative/set/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::set<int> M;
@@ -56,4 +55,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/types.pass.cpp b/test/std/containers/associative/set/types.pass.cpp
index f1ce8a7c9..5c7bd25a5 100644
--- a/test/std/containers/associative/set/types.pass.cpp
+++ b/test/std/containers/associative/set/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::set<int> C;
@@ -67,4 +66,6 @@ int main()
     static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/associative/set/upper_bound.pass.cpp b/test/std/containers/associative/set/upper_bound.pass.cpp
index bafb4377f..3649a5c04 100644
--- a/test/std/containers/associative/set/upper_bound.pass.cpp
+++ b/test/std/containers/associative/set/upper_bound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "private_constructor.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int V;
@@ -334,4 +333,6 @@ int main()
     assert(r == next(m.begin(), 8));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/nothing_to_do.pass.cpp b/test/std/containers/container.adaptors/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.adaptors/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.adaptors/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_alloc.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_alloc.pass.cpp
index 6210a59c3..59547203b 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ struct test
     using base::c;
 };
 
-int main()
+int main(int, char**)
 {
     test<int> q((test_allocator<int>(3)));
     assert(q.c.get_allocator() == test_allocator<int>(3));
     assert(q.c.size() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_alloc.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_alloc.pass.cpp
index b1d13fb8b..40f6bc473 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ struct test
     using base::c;
 };
 
-int main()
+int main(int, char**)
 {
     test<int> q(std::less<int>(), test_allocator<int>(3));
     assert(q.c.get_allocator() == test_allocator<int>(3));
     assert(q.c.size() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_cont_alloc.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_cont_alloc.pass.cpp
index dc5cca3c5..1f3dd7fbd 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_cont_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_cont_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ struct test
     using base::c;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::vector<int, test_allocator<int> > C;
     C v = make<C>(5);
@@ -60,4 +59,6 @@ int main()
     assert(q.c.get_allocator() == test_allocator<int>(3));
     assert(q.size() == 5);
     assert(q.top() == 4);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_rcont_alloc.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_rcont_alloc.pass.cpp
index a27a6e205..3956f9b97 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_rcont_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_comp_rcont_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,11 +51,13 @@ struct test
     using base::c;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::vector<int, test_allocator<int> > C;
     test<int> q(std::less<int>(), make<C>(5), test_allocator<int>(3));
     assert(q.c.get_allocator() == test_allocator<int>(3));
     assert(q.size() == 5);
     assert(q.top() == 4);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_copy_alloc.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_copy_alloc.pass.cpp
index a5a073c07..c46171843 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_copy_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ struct test
     using base::c;
 };
 
-int main()
+int main(int, char**)
 {
     test<int> qo(std::less<int>(),
                       make<std::vector<int, test_allocator<int> > >(5),
@@ -55,4 +54,6 @@ int main()
     assert(q.size() == 5);
     assert(q.c.get_allocator() == test_allocator<int>(6));
     assert(q.top() == int(4));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_move_alloc.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_move_alloc.pass.cpp
index df255b4cf..98dc207c1 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_move_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons.alloc/ctor_move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ struct test
 };
 
 
-int main()
+int main(int, char**)
 {
     test<MoveOnly> qo(std::less<MoveOnly>(),
                       make<std::vector<MoveOnly, test_allocator<MoveOnly> > >(5),
@@ -63,4 +62,6 @@ int main()
     assert(q.size() == 5);
     assert(q.c.get_allocator() == test_allocator<MoveOnly>(6));
     assert(q.top() == MoveOnly(4));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp
index 82e44b414..5b7760d05 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::vector<int> v = make<std::vector<int> >(5);
     std::priority_queue<int, std::vector<int>, std::greater<int> > qo(std::greater<int>(), v);
@@ -33,4 +32,6 @@ int main()
     q = qo;
     assert(q.size() == 5);
     assert(q.top() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_move.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_move.pass.cpp
index 4b20b265f..20f62d9bf 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_move.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,11 +29,13 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<MoveOnly> qo(std::less<MoveOnly>(), make<std::vector<MoveOnly> >(5));
     std::priority_queue<MoveOnly> q;
     q = std::move(qo);
     assert(q.size() == 5);
     assert(q.top() == MoveOnly(4));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp.pass.cpp
index f435ac306..02f1bcaf0 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int, std::vector<int, limited_allocator<int, 10> > > q((std::less<int>()));
     assert(q.size() == 0);
@@ -24,4 +23,6 @@ int main()
     q.push(2);
     assert(q.size() == 2);
     assert(q.top() == 2);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp
index 2c73cbc62..487b86c5f 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_container.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,10 +24,12 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::vector<int> v = make<std::vector<int> >(5);
     std::priority_queue<int, std::vector<int>, std::greater<int> > q(std::greater<int>(), v);
     assert(q.size() == 5);
     assert(q.top() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_rcontainer.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_rcontainer.pass.cpp
index 719f6d980..47980032c 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_rcontainer.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_comp_rcontainer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,9 +29,11 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<MoveOnly> q(std::less<MoveOnly>(), make<std::vector<MoveOnly> >(5));
     assert(q.size() == 5);
     assert(q.top() == MoveOnly(4));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp
index f1129bc1b..fa8bae2b9 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,11 +24,13 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::vector<int> v = make<std::vector<int> >(5);
     std::priority_queue<int, std::vector<int>, std::greater<int> > qo(std::greater<int>(), v);
     std::priority_queue<int, std::vector<int>, std::greater<int> > q = qo;
     assert(q.size() == 5);
     assert(q.top() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_default.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_default.pass.cpp
index 5125a4336..4c8dd524a 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_default.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int, std::vector<int, limited_allocator<int, 10> > > q;
     assert(q.size() == 0);
@@ -24,4 +23,6 @@ int main()
     q.push(2);
     assert(q.size() == 2);
     assert(q.top() == 2);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter.pass.cpp
index b3cd33549..d2afe72ca 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     int a[] = {3, 5, 2, 0, 6, 8, 1};
     int* an = a + sizeof(a)/sizeof(a[0]);
     std::priority_queue<int> q(a, an);
     assert(q.size() == static_cast<std::size_t>(an - a));
     assert(q.top() == 8);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp
index 360f66393..caee12f0f 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <functional>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     int a[] = {3, 5, 2, 0, 6, 8, 1};
     int* an = a + sizeof(a)/sizeof(a[0]);
@@ -25,4 +24,6 @@ int main()
         q(a, an, std::greater<int>());
     assert(q.size() == static_cast<std::size_t>(an - a));
     assert(q.top() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_cont.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_cont.pass.cpp
index b44d7d38c..0b0766792 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_cont.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_cont.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = {3, 5, 2, 0, 6, 8, 1};
     const int n = sizeof(a)/sizeof(a[0]);
@@ -24,4 +23,6 @@ int main()
     std::priority_queue<int> q(a+n/2, a+n, std::less<int>(), v);
     assert(q.size() == n);
     assert(q.top() == 8);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_rcont.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_rcont.pass.cpp
index 450dff37c..6bc4417f4 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_rcont.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_iter_iter_comp_rcont.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     int a[] = {3, 5, 2, 0, 6, 8, 1};
     const int n = sizeof(a)/sizeof(a[0]);
@@ -29,4 +28,6 @@ int main()
                                     std::vector<MoveOnly>(a, a+n/2));
     assert(q.size() == n);
     assert(q.top() == MoveOnly(8));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_move.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_move.pass.cpp
index 229ec02fc..415801244 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_move.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/ctor_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,10 +29,12 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<MoveOnly> qo(std::less<MoveOnly>(), make<std::vector<MoveOnly> >(5));
     std::priority_queue<MoveOnly> q = std::move(qo);
     assert(q.size() == 5);
     assert(q.top() == MoveOnly(4));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.fail.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.fail.cpp
index f3b052794..a6e579a44 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.fail.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cstddef>
 
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
     {
@@ -55,4 +54,6 @@ int main()
 //      stack<allocator<int>, allocator<allocator<int>>>
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.pass.cpp
index bcbe1276a..45d39ad3e 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -120,4 +119,6 @@ int main()
     assert(pri.size() == 4);
     assert(pri.top() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/default_noexcept.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/default_noexcept.pass.cpp
index e0547d64a..d738a553e 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -32,4 +31,6 @@ int main()
         static_assert(std::is_nothrow_default_constructible<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/dtor_noexcept.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/dtor_noexcept.pass.cpp
index 3cedefef2..af583a9e2 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::priority_queue<MoveOnly> C;
         static_assert(std::is_nothrow_destructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_assign_noexcept.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_assign_noexcept.pass.cpp
index f14c3ae7c..3fbd53dc4 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::priority_queue<MoveOnly> C;
         static_assert(std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_noexcept.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_noexcept.pass.cpp
index 9c2058d47..7c6b5f213 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::priority_queue<MoveOnly> C;
         static_assert(std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/emplace.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/emplace.pass.cpp
index be928fc2e..928533075 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/emplace.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "../../../Emplaceable.h"
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<Emplaceable> q;
     q.emplace(1, 2.5);
@@ -29,4 +28,6 @@ int main()
     assert(q.top() == Emplaceable(3, 4.5));
     q.emplace(2, 3.5);
     assert(q.top() == Emplaceable(3, 4.5));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.fail.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.fail.cpp
index c034f22b7..698553d33 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.fail.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::priority_queue<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.pass.cpp
index f0c914a04..f8f9279d5 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int> q;
     assert(q.empty());
@@ -24,4 +23,6 @@ int main()
     assert(!q.empty());
     q.pop();
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/pop.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/pop.pass.cpp
index f41b26f68..a6fc9509c 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/pop.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/pop.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int> q;
     q.push(1);
@@ -31,4 +30,6 @@ int main()
     assert(q.top() == 1);
     q.pop();
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/push.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/push.pass.cpp
index 288e858f9..01c0ab618 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/push.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/push.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int> q;
     q.push(1);
@@ -25,4 +24,6 @@ int main()
     assert(q.top() == 3);
     q.push(2);
     assert(q.top() == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/push_rvalue.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/push_rvalue.pass.cpp
index 7f4827267..cf474dec5 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/push_rvalue.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/push_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<MoveOnly> q;
     q.push(1);
@@ -29,4 +28,6 @@ int main()
     assert(q.top() == 3);
     q.push(2);
     assert(q.top() == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/size.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/size.pass.cpp
index 0ed579e06..393a97c28 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/size.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int> q;
     assert(q.size() == 0);
@@ -24,4 +23,6 @@ int main()
     assert(q.size() == 1);
     q.pop();
     assert(q.size() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/swap.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/swap.pass.cpp
index 397d67fab..bc3f453d8 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/swap.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int> q1;
     std::priority_queue<int> q2;
@@ -27,4 +26,6 @@ int main()
     assert(q1.empty());
     assert(q2.size() == 3);
     assert(q2.top() == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.members/top.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.members/top.pass.cpp
index eddbb926d..ea0e489f6 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.members/top.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.members/top.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int> q;
     q.push(1);
@@ -25,4 +24,6 @@ int main()
     assert(q.top() == 3);
     q.push(2);
     assert(q.top() == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap.pass.cpp
index 1a828adde..bc75df0d3 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::priority_queue<int> q1;
     std::priority_queue<int> q2;
@@ -29,4 +28,6 @@ int main()
     assert(q1.empty());
     assert(q2.size() == 3);
     assert(q2.top() == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap_noexcept.pass.cpp b/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap_noexcept.pass.cpp
index 845ca7587..ad4254c2b 100644
--- a/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/priqueue.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,10 +22,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::priority_queue<MoveOnly> C;
         static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/types.fail.cpp b/test/std/containers/container.adaptors/priority.queue/types.fail.cpp
index 832f09058..244028e44 100644
--- a/test/std/containers/container.adaptors/priority.queue/types.fail.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/types.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@
 #include <cassert>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
 //  LWG#2566 says that the first template param must match the second one's value type
     std::priority_queue<double, std::deque<int>> t;
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/priority.queue/types.pass.cpp b/test/std/containers/container.adaptors/priority.queue/types.pass.cpp
index 6bc476a3c..547128190 100644
--- a/test/std/containers/container.adaptors/priority.queue/types.pass.cpp
+++ b/test/std/containers/container.adaptors/priority.queue/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ struct C
     typedef int size_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert(( std::is_same<std::priority_queue<int>::container_type, std::vector<int> >::value), "");
     static_assert(( std::is_same<std::priority_queue<int, std::deque<int> >::container_type, std::deque<int> >::value), "");
@@ -65,4 +64,6 @@ int main()
     static_assert(( std::uses_allocator<std::priority_queue<int>, std::allocator<int> >::value), "");
     static_assert((!std::uses_allocator<std::priority_queue<int, C>, std::allocator<int> >::value), "");
     test t;
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_alloc.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_alloc.pass.cpp
index 404db1240..8d916f767 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,8 +31,10 @@ struct test
     test_allocator<int> get_allocator() {return c.get_allocator();}
 };
 
-int main()
+int main(int, char**)
 {
     test q(test_allocator<int>(3));
     assert(q.get_allocator() == test_allocator<int>(3));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_container_alloc.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_container_alloc.pass.cpp
index 06a53fe38..56272064f 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_container_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_container_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct test
     test_allocator<int> get_allocator() {return c.get_allocator();}
 };
 
-int main()
+int main(int, char**)
 {
     C d = make<C>(5);
     test q(d, test_allocator<int>(4));
@@ -56,4 +55,6 @@ int main()
         assert(q.front() == d[i]);
         q.pop();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_queue_alloc.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_queue_alloc.pass.cpp
index 70eaa18f9..8a66c6f12 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_queue_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_queue_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,10 +42,12 @@ struct test
     allocator_type get_allocator() {return this->c.get_allocator();}
 };
 
-int main()
+int main(int, char**)
 {
     test<int> q(make<C>(5), test_allocator<int>(4));
     test<int> q2(q, test_allocator<int>(5));
     assert(q2.get_allocator() == test_allocator<int>(5));
     assert(q2.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rcontainer_alloc.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rcontainer_alloc.pass.cpp
index 243585693..3af4fb0da 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rcontainer_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rcontainer_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,9 +48,11 @@ struct test
 };
 
 
-int main()
+int main(int, char**)
 {
     test<MoveOnly> q(make<C>(5), test_allocator<MoveOnly>(4));
     assert(q.get_allocator() == test_allocator<MoveOnly>(4));
     assert(q.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rqueue_alloc.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rqueue_alloc.pass.cpp
index 76428e33f..29a742df7 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rqueue_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons.alloc/ctor_rqueue_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,10 +48,12 @@ struct test
 };
 
 
-int main()
+int main(int, char**)
 {
     test<MoveOnly> q(make<C>(5), test_allocator<MoveOnly>(4));
     test<MoveOnly> q2(std::move(q), test_allocator<MoveOnly>(5));
     assert(q2.get_allocator() == test_allocator<MoveOnly>(5));
     assert(q2.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/ctor_container.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/ctor_container.pass.cpp
index 6832a5f8b..dad35d2d1 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/ctor_container.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/ctor_container.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::deque<int> d = make<std::deque<int> >(5);
     std::queue<int> q(d);
@@ -35,4 +34,6 @@ int main()
         assert(q.front() == d[i]);
         q.pop();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/ctor_copy.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/ctor_copy.pass.cpp
index 998f84979..19e46a236 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/ctor_copy.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/ctor_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,9 +23,11 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q(make<std::deque<int> >(5));
     std::queue<int> q2 = q;
     assert(q2 == q);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/ctor_default.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/ctor_default.pass.cpp
index f4b692236..c5c8b17a6 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/ctor_default.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::queue<int, std::vector<int, limited_allocator<int, 10> > > q;
     assert(q.size() == 0);
@@ -25,4 +24,6 @@ int main()
     assert(q.size() == 2);
     assert(q.front() == 1);
     assert(q.back() == 2);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/ctor_move.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/ctor_move.pass.cpp
index 57e22963e..c275d5d60 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/ctor_move.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/ctor_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,10 +29,12 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::queue<MoveOnly> q(make<std::deque<MoveOnly> >(5));
     std::queue<MoveOnly> q2 = std::move(q);
     assert(q2.size() == 5);
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/ctor_rcontainer.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/ctor_rcontainer.pass.cpp
index 1b3f25608..3812ce916 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/ctor_rcontainer.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/ctor_rcontainer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,8 +29,10 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::queue<MoveOnly> q(make<std::deque<MoveOnly> >(5));
     assert(q.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/deduct.fail.cpp b/test/std/containers/container.adaptors/queue/queue.cons/deduct.fail.cpp
index 1605b96b1..00b39c6a9 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/deduct.fail.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cstddef>
 
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
     {
@@ -43,4 +42,6 @@ int main()
 //      stack<allocator<int>, allocator<allocator<int>>>
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp
index 58cb7f535..247da2a3d 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -88,4 +87,6 @@ int main()
     assert(que.back() == 3);
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/default_noexcept.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/default_noexcept.pass.cpp
index 7518bcc71..1200f2e2f 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -30,4 +29,6 @@ int main()
         static_assert(std::is_nothrow_default_constructible<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/dtor_noexcept.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/dtor_noexcept.pass.cpp
index 2a6783287..18e42ea3a 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::queue<MoveOnly> C;
         static_assert(std::is_nothrow_destructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/move_assign_noexcept.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/move_assign_noexcept.pass.cpp
index 42e1c458c..a82ab8fa4 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::queue<MoveOnly> C;
         static_assert(std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.cons/move_noexcept.pass.cpp b/test/std/containers/container.adaptors/queue/queue.cons/move_noexcept.pass.cpp
index a89fbef8b..e4c170a8b 100644
--- a/test/std/containers/container.adaptors/queue/queue.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -31,4 +30,6 @@ int main()
         static_assert(std::is_nothrow_move_constructible<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/assign_copy.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/assign_copy.pass.cpp
index e9afa0b8c..98385a6f7 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/assign_copy.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,10 +23,12 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q(make<std::deque<int> >(5));
     std::queue<int> q2;
     q2 = q;
     assert(q2 == q);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/assign_move.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/assign_move.pass.cpp
index 0932b7d99..de30e5cfe 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/assign_move.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,11 +29,13 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::queue<MoveOnly> q(make<std::deque<MoveOnly> >(5));
     std::queue<MoveOnly> q2;
     q2 = std::move(q);
     assert(q2.size() == 5);
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/back.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/back.pass.cpp
index e91edc283..cb115c702 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/back.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     assert(q.size() == 0);
@@ -23,4 +22,6 @@ int main()
     q.push(3);
     int& ir = q.back();
     assert(ir == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/back_const.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/back_const.pass.cpp
index f2696e903..3a6e4c890 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/back_const.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/back_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     assert(q.size() == 0);
@@ -24,4 +23,6 @@ int main()
     const std::queue<int>& cqr = q;
     const int& cir = cqr.back();
     assert(cir == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/emplace.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/emplace.pass.cpp
index 25f6bc76e..74afcce97 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/emplace.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ void test_return_type() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<std::queue<int> > ();
     test_return_type<std::queue<int, std::list<int> > > ();
@@ -62,4 +61,6 @@ int main()
     assert(q.size() == 3);
     assert(q.front() == Emplaceable(1, 2.5));
     assert(q.back() == Emplaceable(3, 4.5));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/empty.fail.cpp b/test/std/containers/container.adaptors/queue/queue.defn/empty.fail.cpp
index ce017d2dd..454bf32be 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/empty.fail.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::queue<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/empty.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/empty.pass.cpp
index deac5fa4d..cc0fc56b7 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/empty.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     assert(q.empty());
@@ -22,4 +21,6 @@ int main()
     assert(!q.empty());
     q.pop();
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/front.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/front.pass.cpp
index 4fbbb0053..9c8d253fb 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/front.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     assert(q.size() == 0);
@@ -23,4 +22,6 @@ int main()
     q.push(3);
     int& ir = q.front();
     assert(ir == 1);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/front_const.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/front_const.pass.cpp
index 253a27817..5ad1ae97a 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/front_const.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/front_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     assert(q.size() == 0);
@@ -24,4 +23,6 @@ int main()
     const std::queue<int>& cqr = q;
     const int& cir = cqr.front();
     assert(cir == 1);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/pop.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/pop.pass.cpp
index 3da2d122f..128cda512 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/pop.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/pop.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     assert(q.size() == 0);
@@ -34,4 +33,6 @@ int main()
     assert(q.back() == 3);
     q.pop();
     assert(q.size() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/push.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/push.pass.cpp
index 9d462954c..b2a784ccf 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/push.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/push.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     q.push(1);
@@ -29,4 +28,6 @@ int main()
     assert(q.size() == 3);
     assert(q.front() == 1);
     assert(q.back() == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/push_rv.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/push_rv.pass.cpp
index 2e0a19a7f..17c442b15 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/push_rv.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/push_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     std::queue<MoveOnly> q;
     q.push(MoveOnly(1));
@@ -33,4 +32,6 @@ int main()
     assert(q.size() == 3);
     assert(q.front() == MoveOnly(1));
     assert(q.back() == MoveOnly(3));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/size.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/size.pass.cpp
index 1c72408f4..fb4fdfcac 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/size.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 #include <queue>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q;
     assert(q.size() == 0);
     q.push(1);
     assert(q.size() == 1);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/swap.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/swap.pass.cpp
index e07449397..3635cea4a 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/swap.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q1 = make<std::queue<int> >(5);
     std::queue<int> q2 = make<std::queue<int> >(10);
@@ -33,4 +32,6 @@ int main()
     q1.swap(q2);
     assert(q1 == q2_save);
     assert(q2 == q1_save);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/types.fail.cpp b/test/std/containers/container.adaptors/queue/queue.defn/types.fail.cpp
index 4bd90a88b..041008ce6 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/types.fail.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/types.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,8 +12,10 @@
 #include <cassert>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
 //  LWG#2566 says that the first template param must match the second one's value type
     std::queue<double, std::deque<int>> t;
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.defn/types.pass.cpp b/test/std/containers/container.adaptors/queue/queue.defn/types.pass.cpp
index 7f1883a16..8623710ea 100644
--- a/test/std/containers/container.adaptors/queue/queue.defn/types.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.defn/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct C
     typedef int size_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert(( std::is_same<std::queue<int>::container_type, std::deque<int> >::value), "");
     static_assert(( std::is_same<std::queue<int, std::vector<int> >::container_type, std::vector<int> >::value), "");
@@ -55,4 +54,6 @@ int main()
     static_assert(( std::uses_allocator<std::queue<int>, std::allocator<int> >::value), "");
     static_assert((!std::uses_allocator<std::queue<int, C>, std::allocator<int> >::value), "");
     test t;
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.ops/eq.pass.cpp b/test/std/containers/container.adaptors/queue/queue.ops/eq.pass.cpp
index a2ad32fec..b4a3327d8 100644
--- a/test/std/containers/container.adaptors/queue/queue.ops/eq.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.ops/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q1 = make<std::queue<int> >(5);
     std::queue<int> q2 = make<std::queue<int> >(10);
@@ -37,4 +36,6 @@ int main()
     assert(q1 == q1_save);
     assert(q1 != q2);
     assert(q2 == q2_save);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.ops/lt.pass.cpp b/test/std/containers/container.adaptors/queue/queue.ops/lt.pass.cpp
index af08cbaca..a8eeb1be1 100644
--- a/test/std/containers/container.adaptors/queue/queue.ops/lt.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.ops/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q1 = make<std::queue<int> >(5);
     std::queue<int> q2 = make<std::queue<int> >(10);
@@ -42,4 +41,6 @@ int main()
     assert(q2 > q1);
     assert(q1 <= q2);
     assert(q2 >= q1);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.special/swap.pass.cpp b/test/std/containers/container.adaptors/queue/queue.special/swap.pass.cpp
index a3f7c43b7..1adc4f1f4 100644
--- a/test/std/containers/container.adaptors/queue/queue.special/swap.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::queue<int> q1 = make<std::queue<int> >(5);
     std::queue<int> q2 = make<std::queue<int> >(10);
@@ -34,4 +33,6 @@ int main()
     swap(q1, q2);
     assert(q1 == q2_save);
     assert(q2 == q1_save);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/queue/queue.special/swap_noexcept.pass.cpp b/test/std/containers/container.adaptors/queue/queue.special/swap_noexcept.pass.cpp
index 542b49011..b8cc387d1 100644
--- a/test/std/containers/container.adaptors/queue/queue.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/queue/queue.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::queue<MoveOnly> C;
         static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_alloc.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_alloc.pass.cpp
index bac8378eb..9fb09b158 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,8 +31,10 @@ struct test
     test_allocator<int> get_allocator() {return c.get_allocator();}
 };
 
-int main()
+int main(int, char**)
 {
     test q(test_allocator<int>(3));
     assert(q.get_allocator() == test_allocator<int>(3));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_container_alloc.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_container_alloc.pass.cpp
index 237870b2c..b0c6f4fca 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_container_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_container_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct test
     test_allocator<int> get_allocator() {return c.get_allocator();}
 };
 
-int main()
+int main(int, char**)
 {
     C d = make<C>(5);
     test q(d, test_allocator<int>(4));
@@ -56,4 +55,6 @@ int main()
         assert(q.top() == d[d.size() - i - 1]);
         q.pop();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_copy_alloc.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_copy_alloc.pass.cpp
index 33cb4dd52..0d8481228 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_copy_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,10 +42,12 @@ struct test
     allocator_type get_allocator() {return this->c.get_allocator();}
 };
 
-int main()
+int main(int, char**)
 {
     test<int> q(make<C>(5), test_allocator<int>(4));
     test<int> q2(q, test_allocator<int>(5));
     assert(q2.get_allocator() == test_allocator<int>(5));
     assert(q2.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rcontainer_alloc.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rcontainer_alloc.pass.cpp
index b0da1ef8b..5181c6739 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rcontainer_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rcontainer_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,9 +48,11 @@ struct test
 };
 
 
-int main()
+int main(int, char**)
 {
     test<MoveOnly> q(make<C>(5), test_allocator<MoveOnly>(4));
     assert(q.get_allocator() == test_allocator<MoveOnly>(4));
     assert(q.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rqueue_alloc.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rqueue_alloc.pass.cpp
index e75a8a267..c5ff35d2d 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rqueue_alloc.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons.alloc/ctor_rqueue_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,10 +48,12 @@ struct test
 };
 
 
-int main()
+int main(int, char**)
 {
     test<MoveOnly> q(make<C>(5), test_allocator<MoveOnly>(4));
     test<MoveOnly> q2(std::move(q), test_allocator<MoveOnly>(5));
     assert(q2.get_allocator() == test_allocator<MoveOnly>(5));
     assert(q2.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/ctor_container.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/ctor_container.pass.cpp
index 7ae12dd70..c649e238f 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/ctor_container.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/ctor_container.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::deque<int> d = make<std::deque<int> >(5);
     std::stack<int> q(d);
@@ -35,4 +34,6 @@ int main()
         assert(q.top() == d[d.size() - i - 1]);
         q.pop();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/ctor_copy.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/ctor_copy.pass.cpp
index 8673e06ce..ef3606366 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/ctor_copy.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/ctor_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,9 +23,11 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q(make<std::deque<int> >(5));
     std::stack<int> q2 = q;
     assert(q2 == q);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/ctor_default.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/ctor_default.pass.cpp
index 82e459a4b..460cf27ec 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/ctor_default.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::stack<int, std::vector<int, limited_allocator<int, 10> > > q;
     assert(q.size() == 0);
@@ -25,4 +24,6 @@ int main()
     q.push(2);
     assert(q.size() == 2);
     assert(q.top() == 2);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/ctor_move.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/ctor_move.pass.cpp
index d837e3d65..86f4414c9 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/ctor_move.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/ctor_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,10 +29,12 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::stack<MoveOnly> q(make<std::deque<MoveOnly> >(5));
     std::stack<MoveOnly> q2 = std::move(q);
     assert(q2.size() == 5);
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/ctor_rcontainer.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/ctor_rcontainer.pass.cpp
index 01d467460..28fb5655f 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/ctor_rcontainer.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/ctor_rcontainer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,8 +29,10 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::stack<MoveOnly> q(make<std::deque<MoveOnly> >(5));
     assert(q.size() == 5);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/deduct.fail.cpp b/test/std/containers/container.adaptors/stack/stack.cons/deduct.fail.cpp
index e54b51084..894906fc4 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/deduct.fail.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <cstddef>
 
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
     {
@@ -50,4 +49,6 @@ int main()
 //      stack<allocator<int>, allocator<allocator<int>>>
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
index bb48f0e5e..dd5ab91a0 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -91,4 +90,6 @@ int main()
     assert(stk.top() == 3);
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/default_noexcept.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/default_noexcept.pass.cpp
index 03c709ef6..d06e2865e 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -31,4 +30,6 @@ int main()
         static_assert(std::is_nothrow_default_constructible<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/dtor_noexcept.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/dtor_noexcept.pass.cpp
index 0a0111b4d..7c5fd6486 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::stack<MoveOnly> C;
         static_assert(std::is_nothrow_destructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/move_assign_noexcept.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/move_assign_noexcept.pass.cpp
index d5822839c..6ed6b8250 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::stack<MoveOnly> C;
         static_assert(std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/move_noexcept.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/move_noexcept.pass.cpp
index 92aef08ba..ddf07c424 100644
--- a/test/std/containers/container.adaptors/stack/stack.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -30,4 +29,6 @@ int main()
         static_assert(std::is_nothrow_move_constructible<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/assign_copy.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/assign_copy.pass.cpp
index 38769e3fb..df34e4c63 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/assign_copy.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,10 +23,12 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q(make<std::deque<int> >(5));
     std::stack<int> q2;
     q2 = q;
     assert(q2 == q);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/assign_move.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/assign_move.pass.cpp
index cbb63462a..ad77defe2 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/assign_move.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,11 +29,13 @@ make(int n)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::stack<MoveOnly> q(make<std::deque<MoveOnly> >(5));
     std::stack<MoveOnly> q2;
     q2 = std::move(q);
     assert(q2.size() == 5);
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/emplace.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/emplace.pass.cpp
index 6830cb716..1aa6b62c7 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/emplace.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test_return_type() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<std::stack<int> > ();
     test_return_type<std::stack<int, std::vector<int> > > ();
@@ -58,4 +57,6 @@ int main()
 #endif
     assert(q.size() == 3);
     assert(q.top() == Emplaceable(3, 4.5));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/empty.fail.cpp b/test/std/containers/container.adaptors/stack/stack.defn/empty.fail.cpp
index 001a38fe3..54cd98629 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/empty.fail.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::stack<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/empty.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/empty.pass.cpp
index a4f728174..a51045e61 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/empty.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <stack>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q;
     assert(q.empty());
@@ -22,4 +21,6 @@ int main()
     assert(!q.empty());
     q.pop();
     assert(q.empty());
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/pop.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/pop.pass.cpp
index 7ec1bf187..95472d7e2 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/pop.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/pop.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <stack>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q;
     assert(q.size() == 0);
@@ -31,4 +30,6 @@ int main()
     assert(q.top() == 1);
     q.pop();
     assert(q.size() == 0);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/push.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/push.pass.cpp
index 6d5c90890..70c085f17 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/push.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/push.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <stack>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q;
     q.push(1);
@@ -26,4 +25,6 @@ int main()
     q.push(3);
     assert(q.size() == 3);
     assert(q.top() == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/push_rv.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/push_rv.pass.cpp
index 9165f6ecc..8969d237b 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/push_rv.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/push_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     std::stack<MoveOnly> q;
     q.push(MoveOnly(1));
@@ -30,4 +29,6 @@ int main()
     q.push(MoveOnly(3));
     assert(q.size() == 3);
     assert(q.top() == MoveOnly(3));
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/size.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/size.pass.cpp
index 2d8024729..26f2e22ee 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/size.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 #include <stack>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q;
     assert(q.size() == 0);
     q.push(1);
     assert(q.size() == 1);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/swap.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/swap.pass.cpp
index 50a29c48a..88ec3cdfe 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/swap.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q1 = make<std::stack<int> >(5);
     std::stack<int> q2 = make<std::stack<int> >(10);
@@ -33,4 +32,6 @@ int main()
     q1.swap(q2);
     assert(q1 == q2_save);
     assert(q2 == q1_save);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/top.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/top.pass.cpp
index 6bde162e3..6923cc9d2 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/top.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/top.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <stack>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q;
     assert(q.size() == 0);
@@ -23,4 +22,6 @@ int main()
     q.push(3);
     int& ir = q.top();
     assert(ir == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/top_const.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/top_const.pass.cpp
index 8e43d05fc..a5e8c49fa 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/top_const.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/top_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <stack>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q;
     assert(q.size() == 0);
@@ -24,4 +23,6 @@ int main()
     const std::stack<int>& cqr = q;
     const int& cir = cqr.top();
     assert(cir == 3);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/types.fail.cpp b/test/std/containers/container.adaptors/stack/stack.defn/types.fail.cpp
index 1cfa8e4da..d5fe97fd5 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/types.fail.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/types.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@
 #include <cassert>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
 //  LWG#2566 says that the first template param must match the second one's value type
     std::stack<double, std::deque<int>> t;
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.defn/types.pass.cpp b/test/std/containers/container.adaptors/stack/stack.defn/types.pass.cpp
index 77a798b83..55fc27f84 100644
--- a/test/std/containers/container.adaptors/stack/stack.defn/types.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.defn/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct C
     typedef int size_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert(( std::is_same<std::stack<int>::container_type, std::deque<int> >::value), "");
     static_assert(( std::is_same<std::stack<int, std::vector<int> >::container_type, std::vector<int> >::value), "");
@@ -56,4 +55,6 @@ int main()
     static_assert(( std::uses_allocator<std::stack<int>, std::allocator<int> >::value), "");
     static_assert((!std::uses_allocator<std::stack<int, C>, std::allocator<int> >::value), "");
     test t;
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.ops/eq.pass.cpp b/test/std/containers/container.adaptors/stack/stack.ops/eq.pass.cpp
index 9b041f7f8..306869f0e 100644
--- a/test/std/containers/container.adaptors/stack/stack.ops/eq.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.ops/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q1 = make<std::stack<int> >(5);
     std::stack<int> q2 = make<std::stack<int> >(10);
@@ -37,4 +36,6 @@ int main()
     assert(q1 == q1_save);
     assert(q1 != q2);
     assert(q2 == q2_save);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.ops/lt.pass.cpp b/test/std/containers/container.adaptors/stack/stack.ops/lt.pass.cpp
index beb937d4c..3c8734bef 100644
--- a/test/std/containers/container.adaptors/stack/stack.ops/lt.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.ops/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q1 = make<std::stack<int> >(5);
     std::stack<int> q2 = make<std::stack<int> >(10);
@@ -42,4 +41,6 @@ int main()
     assert(q2 > q1);
     assert(q1 <= q2);
     assert(q2 >= q1);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.special/swap.pass.cpp b/test/std/containers/container.adaptors/stack/stack.special/swap.pass.cpp
index 90371146d..cb1323b58 100644
--- a/test/std/containers/container.adaptors/stack/stack.special/swap.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ make(int n)
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     std::stack<int> q1 = make<std::stack<int> >(5);
     std::stack<int> q2 = make<std::stack<int> >(10);
@@ -34,4 +33,6 @@ int main()
     swap(q1, q2);
     assert(q1 == q2_save);
     assert(q2 == q1_save);
+
+  return 0;
 }
diff --git a/test/std/containers/container.adaptors/stack/stack.special/swap_noexcept.pass.cpp b/test/std/containers/container.adaptors/stack/stack.special/swap_noexcept.pass.cpp
index 121500553..415ea607e 100644
--- a/test/std/containers/container.adaptors/stack/stack.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/container.adaptors/stack/stack.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::stack<MoveOnly> C;
         static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/container.node/node_handle.pass.cpp b/test/std/containers/container.node/node_handle.pass.cpp
index 1c815a468..40cd8d049 100644
--- a/test/std/containers/container.node/node_handle.pass.cpp
+++ b/test/std/containers/container.node/node_handle.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -129,7 +128,7 @@ void test_insert_return_type()
     test_typedef<typename Container::insert_return_type>();
 }
 
-int main()
+int main(int, char**)
 {
     test_node_handle_operations<std::map<int, int>>();
     test_node_handle_operations_multi<std::multimap<int, int>>();
@@ -144,4 +143,6 @@ int main()
     test_insert_return_type<std::set<int>>();
     test_insert_return_type<std::unordered_map<int, int>>();
     test_insert_return_type<std::unordered_set<int>>();
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/associative.reqmts/associative.reqmts.except/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/associative.reqmts/associative.reqmts.except/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/associative.reqmts/associative.reqmts.except/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/associative.reqmts/associative.reqmts.except/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/associative.reqmts/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/associative.reqmts/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/associative.reqmts/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/associative.reqmts/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/container.requirements.dataraces/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/container.requirements.dataraces/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/container.requirements.dataraces/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/container.requirements.dataraces/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/container.requirements.general/allocator_move.pass.cpp b/test/std/containers/container.requirements/container.requirements.general/allocator_move.pass.cpp
index 81f4ad893..98c291c2e 100644
--- a/test/std/containers/container.requirements/container.requirements.general/allocator_move.pass.cpp
+++ b/test/std/containers/container.requirements/container.requirements.general/allocator_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ void test(int expected_num_allocs = 1) {
   }
 }
 
-int main() {
+int main(int, char**) {
   { // test sequence containers
     test<std::vector<int, test_allocator<int> > >();
     test<std::vector<bool, test_allocator<bool> > >();
@@ -103,4 +102,6 @@ int main() {
     test<std::unordered_multimap<int, int, std::hash<int>, std::equal_to<int>,
                                  test_allocator<KV> > >(stored_allocators);
   }
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/container.requirements.general/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/container.requirements.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/container.requirements.general/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/container.requirements.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/sequence.reqmts/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/sequence.reqmts/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/sequence.reqmts/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/sequence.reqmts/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/unord.req/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/unord.req/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/unord.req/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/unord.req/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/container.requirements/unord.req/unord.req.except/nothing_to_do.pass.cpp b/test/std/containers/container.requirements/unord.req/unord.req.except/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/container.requirements/unord.req/unord.req.except/nothing_to_do.pass.cpp
+++ b/test/std/containers/container.requirements/unord.req/unord.req.except/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/containers.general/nothing_to_do.pass.cpp b/test/std/containers/containers.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/containers.general/nothing_to_do.pass.cpp
+++ b/test/std/containers/containers.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/map_allocator_requirement_test_templates.h b/test/std/containers/map_allocator_requirement_test_templates.h
index 374970d48..64b4b60ca 100644
--- a/test/std/containers/map_allocator_requirement_test_templates.h
+++ b/test/std/containers/map_allocator_requirement_test_templates.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef MAP_ALLOCATOR_REQUIREMENT_TEST_TEMPLATES_H
diff --git a/test/std/containers/nothing_to_do.pass.cpp b/test/std/containers/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/nothing_to_do.pass.cpp
+++ b/test/std/containers/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.cons/deduct.fail.cpp b/test/std/containers/sequences/array/array.cons/deduct.fail.cpp
index c04c9b607..0c0d32f69 100644
--- a/test/std/containers/sequences/array/array.cons/deduct.fail.cpp
+++ b/test/std/containers/sequences/array/array.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,9 +28,11 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::array arr{1,2,3L}; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'array'}}
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.cons/deduct.pass.cpp b/test/std/containers/sequences/array/array.cons/deduct.pass.cpp
index bfa0bb791..141aafc2a 100644
--- a/test/std/containers/sequences/array/array.cons/deduct.pass.cpp
+++ b/test/std/containers/sequences/array/array.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
     {
@@ -62,4 +61,6 @@ int main()
     assert(arr[0] == 4.0);
     assert(arr[1] == 5.0);
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.cons/default.pass.cpp b/test/std/containers/sequences/array/array.cons/default.pass.cpp
index 9a2a6eaa3..daa6a5252 100644
--- a/test/std/containers/sequences/array/array.cons/default.pass.cpp
+++ b/test/std/containers/sequences/array/array.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ struct NoDefault {
   NoDefault(int) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -45,4 +44,6 @@ int main()
       C c2 = {{}};
       assert(c2.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.cons/implicit_copy.pass.cpp b/test/std/containers/sequences/array/array.cons/implicit_copy.pass.cpp
index 7814085e8..c0e205c83 100644
--- a/test/std/containers/sequences/array/array.cons/implicit_copy.pass.cpp
+++ b/test/std/containers/sequences/array/array.cons/implicit_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct NoDefault {
   NoDefault(int) {}
 };
 
-int main() {
+int main(int, char**) {
   {
     typedef double T;
     typedef std::array<T, 3> C;
@@ -90,4 +89,6 @@ int main() {
     TEST_NOT_COPY_ASSIGNABLE(C);
   }
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.cons/initializer_list.pass.cpp b/test/std/containers/sequences/array/array.cons/initializer_list.pass.cpp
index 64ea75a40..e85269796 100644
--- a/test/std/containers/sequences/array/array.cons/initializer_list.pass.cpp
+++ b/test/std/containers/sequences/array/array.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         C c = {};
         assert(c.size() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.data/data.pass.cpp b/test/std/containers/sequences/array/array.data/data.pass.cpp
index ba2c571eb..ce1843eb5 100644
--- a/test/std/containers/sequences/array/array.data/data.pass.cpp
+++ b/test/std/containers/sequences/array/array.data/data.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct NoDefault {
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -68,4 +67,6 @@ int main()
       T* p = c.data();
       LIBCPP_ASSERT(p != nullptr);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.data/data_const.pass.cpp b/test/std/containers/sequences/array/array.data/data_const.pass.cpp
index f46352564..32c05d7ef 100644
--- a/test/std/containers/sequences/array/array.data/data_const.pass.cpp
+++ b/test/std/containers/sequences/array/array.data/data_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct NoDefault {
   NoDefault(int) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -71,4 +70,6 @@ int main()
         static_assert ( *c2.data()  ==  c2[0], "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.fill/fill.fail.cpp b/test/std/containers/sequences/array/array.fill/fill.fail.cpp
index 4cd8e60ac..9f560dab4 100644
--- a/test/std/containers/sequences/array/array.fill/fill.fail.cpp
+++ b/test/std/containers/sequences/array/array.fill/fill.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main() {
+int main(int, char**) {
   {
     typedef double T;
     typedef std::array<const T, 0> C;
@@ -26,4 +25,6 @@ int main() {
     // expected-error-re@array:* {{static_assert failed {{.*}}"cannot fill zero-sized array of type 'const T'"}}
     c.fill(5.5); // expected-note {{requested here}}
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.fill/fill.pass.cpp b/test/std/containers/sequences/array/array.fill/fill.pass.cpp
index 5bc42ceb8..db7363ab9 100644
--- a/test/std/containers/sequences/array/array.fill/fill.pass.cpp
+++ b/test/std/containers/sequences/array/array.fill/fill.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -37,4 +36,6 @@ int main()
         c.fill(5.5);
         assert(c.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.size/size.pass.cpp b/test/std/containers/sequences/array/array.size/size.pass.cpp
index 2fe535512..f837bdcf8 100644
--- a/test/std/containers/sequences/array/array.size/size.pass.cpp
+++ b/test/std/containers/sequences/array/array.size/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -56,4 +55,6 @@ int main()
         static_assert(c.empty(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.special/swap.pass.cpp b/test/std/containers/sequences/array/array.special/swap.pass.cpp
index 413f291a2..6c9ed957b 100644
--- a/test/std/containers/sequences/array/array.special/swap.pass.cpp
+++ b/test/std/containers/sequences/array/array.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ std::false_type can_swap_imp(...);
 template <class Tp>
 struct can_swap : std::is_same<decltype(can_swap_imp<Tp>(0)), void> {};
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -82,4 +81,6 @@ int main()
         static_assert(!can_swap<C1&>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.swap/swap.fail.cpp b/test/std/containers/sequences/array/array.swap/swap.fail.cpp
index 638c5b321..90c149615 100644
--- a/test/std/containers/sequences/array/array.swap/swap.fail.cpp
+++ b/test/std/containers/sequences/array/array.swap/swap.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main() {
+int main(int, char**) {
   {
     typedef double T;
     typedef std::array<const T, 0> C;
@@ -27,4 +26,6 @@ int main() {
     // expected-error-re@array:* {{static_assert failed {{.*}}"cannot swap zero-sized array of type 'const T'"}}
     c.swap(c2); // expected-note {{requested here}}
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.swap/swap.pass.cpp b/test/std/containers/sequences/array/array.swap/swap.pass.cpp
index 8d01dbf95..aac8a13b2 100644
--- a/test/std/containers/sequences/array/array.swap/swap.pass.cpp
+++ b/test/std/containers/sequences/array/array.swap/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ private:
   NonSwappable& operator=(NonSwappable const&);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -90,4 +89,6 @@ int main()
 #endif
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/get.fail.cpp b/test/std/containers/sequences/array/array.tuple/get.fail.cpp
index a7e56fcce..7bfe670b2 100644
--- a/test/std/containers/sequences/array/array.tuple/get.fail.cpp
+++ b/test/std/containers/sequences/array/array.tuple/get.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -33,4 +32,6 @@ int main()
         std::get<3>(c) = 5.5; // expected-note {{requested here}}
         // expected-error-re@array:* {{static_assert failed{{( due to requirement '3U[L]{0,2} < 3U[L]{0,2}')?}} "Index out of bounds in std::get<> (std::array)"}}
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/get.pass.cpp b/test/std/containers/sequences/array/array.tuple/get.pass.cpp
index 4f210c4f7..9e94417ac 100644
--- a/test/std/containers/sequences/array/array.tuple/get.pass.cpp
+++ b/test/std/containers/sequences/array/array.tuple/get.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct S {
 constexpr std::array<int, 2> getArr () { return { 3, 4 }; }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -56,4 +55,6 @@ int main()
         static_assert(std::get<1>(getArr()) == 4, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/get_const.pass.cpp b/test/std/containers/sequences/array/array.tuple/get_const.pass.cpp
index 04606bf6c..b22a76185 100644
--- a/test/std/containers/sequences/array/array.tuple/get_const.pass.cpp
+++ b/test/std/containers/sequences/array/array.tuple/get_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -40,4 +39,6 @@ int main()
         static_assert(std::get<2>(c) == 3.5, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp b/test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp
index a22c91a4d..ce8fc4fd3 100644
--- a/test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp
+++ b/test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -48,4 +47,6 @@ int main()
     static_assert(std::get<2>(std::move(c)) == 3.5, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/get_rv.pass.cpp b/test/std/containers/sequences/array/array.tuple/get_rv.pass.cpp
index 72ef49b15..d36fcdcc2 100644
--- a/test/std/containers/sequences/array/array.tuple/get_rv.pass.cpp
+++ b/test/std/containers/sequences/array/array.tuple/get_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -32,4 +31,6 @@ int main()
         T t = std::get<0>(std::move(c));
         assert(*t == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/tuple_element.fail.cpp b/test/std/containers/sequences/array/array.tuple/tuple_element.fail.cpp
index 2139fc1ad..a4fbd3ab4 100644
--- a/test/std/containers/sequences/array/array.tuple/tuple_element.fail.cpp
+++ b/test/std/containers/sequences/array/array.tuple/tuple_element.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -32,4 +31,6 @@ int main()
         std::tuple_element<3, C> foo; // expected-note {{requested here}}
         // expected-error-re@array:* {{static_assert failed{{( due to requirement '3U[L]{0,2} < 3U[L]{0,2}')?}} "Index out of bounds in std::tuple_element<> (std::array)"}}
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/tuple_element.pass.cpp b/test/std/containers/sequences/array/array.tuple/tuple_element.pass.cpp
index 91d6b4e5d..fbf5210f2 100644
--- a/test/std/containers/sequences/array/array.tuple/tuple_element.pass.cpp
+++ b/test/std/containers/sequences/array/array.tuple/tuple_element.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,8 +46,10 @@ void test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<double>();
     test<int>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.tuple/tuple_size.pass.cpp b/test/std/containers/sequences/array/array.tuple/tuple_size.pass.cpp
index 1e565d194..dddcbcaff 100644
--- a/test/std/containers/sequences/array/array.tuple/tuple_size.pass.cpp
+++ b/test/std/containers/sequences/array/array.tuple/tuple_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,9 +33,11 @@ void test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<double, 0>();
     test<double, 3>();
     test<double, 5>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/array.zero/tested_elsewhere.pass.cpp b/test/std/containers/sequences/array/array.zero/tested_elsewhere.pass.cpp
index 0aa2f50d8..966e603d1 100644
--- a/test/std/containers/sequences/array/array.zero/tested_elsewhere.pass.cpp
+++ b/test/std/containers/sequences/array/array.zero/tested_elsewhere.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,6 +12,8 @@
 
 #include <array>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/at.pass.cpp b/test/std/containers/sequences/array/at.pass.cpp
index 84a8d6f9d..0240d5a83 100644
--- a/test/std/containers/sequences/array/at.pass.cpp
+++ b/test/std/containers/sequences/array/at.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ constexpr bool check_idx( size_t idx, double val )
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -117,4 +116,6 @@ int main()
         static_assert (check_idx(2, 3.5), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/begin.pass.cpp b/test/std/containers/sequences/array/begin.pass.cpp
index 37c6b5eec..7b26d231d 100644
--- a/test/std/containers/sequences/array/begin.pass.cpp
+++ b/test/std/containers/sequences/array/begin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct NoDefault {
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
       LIBCPP_ASSERT(ib != nullptr);
       LIBCPP_ASSERT(ie != nullptr);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/compare.fail.cpp b/test/std/containers/sequences/array/compare.fail.cpp
index 2aa7cd896..47859ad49 100644
--- a/test/std/containers/sequences/array/compare.fail.cpp
+++ b/test/std/containers/sequences/array/compare.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ void test_compare(const Array& LHS, const Array& RHS) {
 
 template <int Dummy> struct NoCompare {};
 
-int main()
+int main(int, char**)
 {
   {
     typedef NoCompare<0> T;
@@ -68,4 +67,6 @@ int main()
     TEST_IGNORE_NODISCARD (c1 == c1);
     TEST_IGNORE_NODISCARD (c1 < c1);
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/compare.pass.cpp b/test/std/containers/sequences/array/compare.pass.cpp
index 5d2bdc50f..c05dd1940 100644
--- a/test/std/containers/sequences/array/compare.pass.cpp
+++ b/test/std/containers/sequences/array/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
   {
     typedef int T;
@@ -59,4 +58,6 @@ int main()
   static_assert(testComparisons6(a2, a1, false, false), "");
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/contiguous.pass.cpp b/test/std/containers/sequences/array/contiguous.pass.cpp
index 27933b0c5..e0ab5b61c 100644
--- a/test/std/containers/sequences/array/contiguous.pass.cpp
+++ b/test/std/containers/sequences/array/contiguous.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,11 +20,13 @@ void test_contiguous ( const C &c )
         assert ( *(c.begin() + i) == *(std::addressof(*c.begin()) + i));
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
         typedef std::array<T, 3> C;
         test_contiguous (C());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/empty.fail.cpp b/test/std/containers/sequences/array/empty.fail.cpp
index fe118c5f1..3bbb3c8e1 100644
--- a/test/std/containers/sequences/array/empty.fail.cpp
+++ b/test/std/containers/sequences/array/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,11 +20,13 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
 
     std::array<int, 1> c;
     c.empty(); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
     std::array<int, 0> c0;
     c0.empty(); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/empty.pass.cpp b/test/std/containers/sequences/array/empty.pass.cpp
index 2c01dfc86..a17aa50c5 100644
--- a/test/std/containers/sequences/array/empty.pass.cpp
+++ b/test/std/containers/sequences/array/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::array<int, 2> C;
@@ -33,4 +32,6 @@ int main()
     ASSERT_NOEXCEPT(c.empty());
     assert( c.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/front_back.pass.cpp b/test/std/containers/sequences/array/front_back.pass.cpp
index 443f28ddf..1a714369f 100644
--- a/test/std/containers/sequences/array/front_back.pass.cpp
+++ b/test/std/containers/sequences/array/front_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ constexpr bool check_back( double val )
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -116,4 +115,6 @@ int main()
         static_assert (check_back (3.5), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/indexing.pass.cpp b/test/std/containers/sequences/array/indexing.pass.cpp
index 7718b92f9..bf55711a1 100644
--- a/test/std/containers/sequences/array/indexing.pass.cpp
+++ b/test/std/containers/sequences/array/indexing.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ constexpr bool check_idx( size_t idx, double val )
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -105,4 +104,6 @@ int main()
         static_assert (check_idx(2, 3.5), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/iterators.pass.cpp b/test/std/containers/sequences/array/iterators.pass.cpp
index dd4aab30a..71fad183f 100644
--- a/test/std/containers/sequences/array/iterators.pass.cpp
+++ b/test/std/containers/sequences/array/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::array<int, 5> C;
@@ -142,4 +141,6 @@ int main()
         static_assert ( *std::crbegin(c) == 4, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/max_size.pass.cpp b/test/std/containers/sequences/array/max_size.pass.cpp
index 9a3fed395..a0b77392e 100644
--- a/test/std/containers/sequences/array/max_size.pass.cpp
+++ b/test/std/containers/sequences/array/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::array<int, 2> C;
@@ -33,4 +32,6 @@ int main()
     ASSERT_NOEXCEPT(c.max_size());
     assert(c.max_size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/size_and_alignment.pass.cpp b/test/std/containers/sequences/array/size_and_alignment.pass.cpp
index 966d063fe..f585da6ce 100644
--- a/test/std/containers/sequences/array/size_and_alignment.pass.cpp
+++ b/test/std/containers/sequences/array/size_and_alignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ struct TEST_ALIGNAS(TEST_ALIGNOF(std::max_align_t) * 2) TestType2 {
 
 //static_assert(sizeof(void*) == 4, "");
 
-int main() {
+int main(int, char**) {
   test_type<char>();
   test_type<int>();
   test_type<double>();
@@ -68,4 +67,6 @@ int main() {
   test_type<std::max_align_t>();
   test_type<TestType1>();
   test_type<TestType2>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/array/types.pass.cpp b/test/std/containers/sequences/array/types.pass.cpp
index 9cf390c4e..f86e008d2 100644
--- a/test/std/containers/sequences/array/types.pass.cpp
+++ b/test/std/containers/sequences/array/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ void test_iterators() {
     static_assert((std::is_same<typename CItT::difference_type, typename C::difference_type>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -94,4 +93,6 @@ int main()
         static_assert((std::is_same<typename C::difference_type,
             typename std::iterator_traits<typename C::const_iterator>::difference_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/allocator_mismatch.fail.cpp b/test/std/containers/sequences/deque/allocator_mismatch.fail.cpp
index 9223c1ecd..287faf75e 100644
--- a/test/std/containers/sequences/deque/allocator_mismatch.fail.cpp
+++ b/test/std/containers/sequences/deque/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <deque>
 
-int main()
+int main(int, char**)
 {
     std::deque<int, std::allocator<long> > d;
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/access.pass.cpp b/test/std/containers/sequences/deque/deque.capacity/access.pass.cpp
index 6f3458a63..86c518450 100644
--- a/test/std/containers/sequences/deque/deque.capacity/access.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/access.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ make(int size, int start = 0 )
     return c;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::deque<int> c = make<std::deque<int> >(10);
@@ -88,4 +87,6 @@ int main()
         assert(c.back() == 9);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/empty.fail.cpp b/test/std/containers/sequences/deque/deque.capacity/empty.fail.cpp
index adfd5f2d8..79e4b30b2 100644
--- a/test/std/containers/sequences/deque/deque.capacity/empty.fail.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::deque<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/empty.pass.cpp b/test/std/containers/sequences/deque/deque.capacity/empty.pass.cpp
index 629a51cab..388594110 100644
--- a/test/std/containers/sequences/deque/deque.capacity/empty.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::deque<int> C;
@@ -43,4 +42,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp b/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp
index 2365d4e11..230a46519 100644
--- a/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   {
     typedef limited_allocator<int, 10> A;
     typedef std::deque<int, A> C;
@@ -44,4 +43,6 @@ int main() {
     assert(c.max_size() <= max_dist);
     assert(c.max_size() <= alloc_max_size(c.get_allocator()));
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/resize_size.pass.cpp b/test/std/containers/sequences/deque/deque.capacity/resize_size.pass.cpp
index 330fd40b7..916159221 100644
--- a/test/std/containers/sequences/deque/deque.capacity/resize_size.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/resize_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ testN(int start, int N, int M)
     test(c1, M);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -86,4 +85,6 @@ int main()
                 testN<std::deque<int, min_allocator<int>>>(rng[i], rng[j], rng[k]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/resize_size_value.pass.cpp b/test/std/containers/sequences/deque/deque.capacity/resize_size_value.pass.cpp
index 3737e727c..876ff2fe5 100644
--- a/test/std/containers/sequences/deque/deque.capacity/resize_size_value.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/resize_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ testN(int start, int N, int M)
     test(c1, M, -10);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -86,4 +85,6 @@ int main()
                 testN<std::deque<int, min_allocator<int>>>(rng[i], rng[j], rng[k]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/shrink_to_fit.pass.cpp b/test/std/containers/sequences/deque/deque.capacity/shrink_to_fit.pass.cpp
index 0cf038721..bde2eaaaa 100644
--- a/test/std/containers/sequences/deque/deque.capacity/shrink_to_fit.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/shrink_to_fit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ testN(int start, int N)
     test(c1);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -74,4 +73,6 @@ int main()
             testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.capacity/size.pass.cpp b/test/std/containers/sequences/deque/deque.capacity/size.pass.cpp
index 4974fc74d..c70abe421 100644
--- a/test/std/containers/sequences/deque/deque.capacity/size.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.capacity/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::deque<int> C;
@@ -59,4 +58,6 @@ int main()
     assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/alloc.pass.cpp b/test/std/containers/sequences/deque/deque.cons/alloc.pass.cpp
index bd7db2651..e2700b958 100644
--- a/test/std/containers/sequences/deque/deque.cons/alloc.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const Allocator& a)
     assert(d.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test<int>(std::allocator<int>());
     test<NotConstructible>(test_allocator<NotConstructible>(3));
@@ -37,4 +36,6 @@ int main()
     test<int>(explicit_allocator<int>());
     test<NotConstructible>(explicit_allocator<NotConstructible>{});
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/assign_initializer_list.pass.cpp b/test/std/containers/sequences/deque/deque.cons/assign_initializer_list.pass.cpp
index fdb751da6..edca369a5 100644
--- a/test/std/containers/sequences/deque/deque.cons/assign_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::deque<int> d;
@@ -38,4 +37,6 @@ int main()
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/assign_iter_iter.pass.cpp b/test/std/containers/sequences/deque/deque.cons/assign_iter_iter.pass.cpp
index 940d4e8d6..d59943574 100644
--- a/test/std/containers/sequences/deque/deque.cons/assign_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/assign_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -150,7 +149,9 @@ void test_emplacable_concept() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   basic_test();
   test_emplacable_concept();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/assign_size_value.pass.cpp b/test/std/containers/sequences/deque/deque.cons/assign_size_value.pass.cpp
index 08325b730..2875a1776 100644
--- a/test/std/containers/sequences/deque/deque.cons/assign_size_value.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/assign_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ testN(int start, int N, int M)
     test(c1, M, -10);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -81,4 +80,6 @@ int main()
                 testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j], rng[k]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/copy.pass.cpp b/test/std/containers/sequences/deque/deque.cons/copy.pass.cpp
index 184054568..2d42ee38a 100644
--- a/test/std/containers/sequences/deque/deque.cons/copy.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const C& x)
     assert(c == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
@@ -58,4 +57,6 @@ int main()
         assert(v2.get_allocator() == v.get_allocator());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/copy_alloc.pass.cpp b/test/std/containers/sequences/deque/deque.cons/copy_alloc.pass.cpp
index 3a49a8bc0..4334fd6a5 100644
--- a/test/std/containers/sequences/deque/deque.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const C& x, const typename C::allocator_type& a)
     assert(c.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
@@ -48,4 +47,6 @@ int main()
                                                           min_allocator<int>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/deduct.fail.cpp b/test/std/containers/sequences/deque/deque.cons/deduct.fail.cpp
index 61ab9c842..99bf89c79 100644
--- a/test/std/containers/sequences/deque/deque.cons/deduct.fail.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
 
@@ -39,4 +38,6 @@ int main()
 //      deque<allocator<int>, allocator<allocator<int>>>
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/deduct.pass.cpp b/test/std/containers/sequences/deque/deque.cons/deduct.pass.cpp
index a2ec262f1..ac0861381 100644
--- a/test/std/containers/sequences/deque/deque.cons/deduct.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -95,4 +94,6 @@ int main()
     static_assert(std::is_same_v<decltype(deq)::allocator_type, std::allocator<long double>>, "");
     assert(deq.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/default.pass.cpp b/test/std/containers/sequences/deque/deque.cons/default.pass.cpp
index 127b08609..f132eb5be 100644
--- a/test/std/containers/sequences/deque/deque.cons/default.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<int, std::allocator<int> >();
     test<NotConstructible, limited_allocator<NotConstructible, 1> >();
@@ -38,4 +37,6 @@ int main()
     test<int, min_allocator<int> >();
     test<NotConstructible, min_allocator<NotConstructible> >();
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp b/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp
index e79e6eca3..abc3de7db 100644
--- a/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -50,4 +49,6 @@ int main()
         typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp b/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp
index 288810089..7e09148b4 100644
--- a/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_alloc
     ~some_alloc() noexcept(false);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::deque<MoveOnly> C;
@@ -48,4 +47,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/initializer_list.pass.cpp b/test/std/containers/sequences/deque/deque.cons/initializer_list.pass.cpp
index dd70cda18..02cbadd6c 100644
--- a/test/std/containers/sequences/deque/deque.cons/initializer_list.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::deque<int> d = {3, 4, 5, 6};
@@ -36,4 +35,6 @@ int main()
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/initializer_list_alloc.pass.cpp b/test/std/containers/sequences/deque/deque.cons/initializer_list_alloc.pass.cpp
index 2619569e1..1450c978b 100644
--- a/test/std/containers/sequences/deque/deque.cons/initializer_list_alloc.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/initializer_list_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::deque<int, test_allocator<int>> d({3, 4, 5, 6}, test_allocator<int>(3));
@@ -39,4 +38,6 @@ int main()
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/iter_iter.pass.cpp b/test/std/containers/sequences/deque/deque.cons/iter_iter.pass.cpp
index 793f2b12a..214ac8303 100644
--- a/test/std/containers/sequences/deque/deque.cons/iter_iter.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -106,7 +105,9 @@ void test_emplacable_concept() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   basic_test();
   test_emplacable_concept();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/iter_iter_alloc.pass.cpp b/test/std/containers/sequences/deque/deque.cons/iter_iter_alloc.pass.cpp
index 9ac342a8f..c72f73a9a 100644
--- a/test/std/containers/sequences/deque/deque.cons/iter_iter_alloc.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/iter_iter_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -97,7 +96,9 @@ void test_emplacable_concept() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   basic_test();
   test_emplacable_concept();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/move.pass.cpp b/test/std/containers/sequences/deque/deque.cons/move.pass.cpp
index a7264a556..b8fdc9892 100644
--- a/test/std/containers/sequences/deque/deque.cons/move.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
@@ -69,4 +68,6 @@ int main()
         assert(c1.size() == 0);
         assert(c3.get_allocator() == c1.get_allocator());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/move_alloc.pass.cpp b/test/std/containers/sequences/deque/deque.cons/move_alloc.pass.cpp
index 5a9a77c74..68dd99f10 100644
--- a/test/std/containers/sequences/deque/deque.cons/move_alloc.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,15 +15,16 @@
 #include <deque>
 #include <cassert>
 
+#include "test_macros.h"
 #include "MoveOnly.h"
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
-        int* an = ab + sizeof(ab)/sizeof(ab[0]);
+        const int* an = ab + sizeof(ab)/sizeof(ab[0]);
         typedef test_allocator<MoveOnly> A;
         std::deque<MoveOnly, A> c1(A(1));
         for (int* p = ab; p < an; ++p)
@@ -32,14 +32,14 @@ int main()
         std::deque<MoveOnly, A> c2(A(1));
         for (int* p = ab; p < an; ++p)
             c2.push_back(MoveOnly(*p));
-        std::deque<MoveOnly, A> c3(std::move(c1), A(3));
+        std::deque<MoveOnly, A> c3(std::move(c1), A(3)); // unequal allocator
         assert(c2 == c3);
         assert(c3.get_allocator() == A(3));
-        assert(c1.size() != 0);
+        LIBCPP_ASSERT(c1.size() != 0);
     }
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
-        int* an = ab + sizeof(ab)/sizeof(ab[0]);
+        const int* an = ab + sizeof(ab)/sizeof(ab[0]);
         typedef test_allocator<MoveOnly> A;
         std::deque<MoveOnly, A> c1(A(1));
         for (int* p = ab; p < an; ++p)
@@ -47,14 +47,14 @@ int main()
         std::deque<MoveOnly, A> c2(A(1));
         for (int* p = ab; p < an; ++p)
             c2.push_back(MoveOnly(*p));
-        std::deque<MoveOnly, A> c3(std::move(c1), A(1));
+        std::deque<MoveOnly, A> c3(std::move(c1), A(1)); // equal allocator
         assert(c2 == c3);
         assert(c3.get_allocator() == A(1));
-        assert(c1.size() == 0);
+        LIBCPP_ASSERT(c1.size() == 0);
     }
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
-        int* an = ab + sizeof(ab)/sizeof(ab[0]);
+        const int* an = ab + sizeof(ab)/sizeof(ab[0]);
         typedef other_allocator<MoveOnly> A;
         std::deque<MoveOnly, A> c1(A(1));
         for (int* p = ab; p < an; ++p)
@@ -62,14 +62,14 @@ int main()
         std::deque<MoveOnly, A> c2(A(1));
         for (int* p = ab; p < an; ++p)
             c2.push_back(MoveOnly(*p));
-        std::deque<MoveOnly, A> c3(std::move(c1), A(3));
+        std::deque<MoveOnly, A> c3(std::move(c1), A(3)); // unequal allocator
         assert(c2 == c3);
         assert(c3.get_allocator() == A(3));
-        assert(c1.size() != 0);
+        LIBCPP_ASSERT(c1.size() != 0);
     }
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
-        int* an = ab + sizeof(ab)/sizeof(ab[0]);
+        const int* an = ab + sizeof(ab)/sizeof(ab[0]);
         typedef min_allocator<MoveOnly> A;
         std::deque<MoveOnly, A> c1(A{});
         for (int* p = ab; p < an; ++p)
@@ -77,9 +77,11 @@ int main()
         std::deque<MoveOnly, A> c2(A{});
         for (int* p = ab; p < an; ++p)
             c2.push_back(MoveOnly(*p));
-        std::deque<MoveOnly, A> c3(std::move(c1), A());
+        std::deque<MoveOnly, A> c3(std::move(c1), A());  // equal allocator
         assert(c2 == c3);
         assert(c3.get_allocator() == A());
-        assert(c1.size() == 0);
+        LIBCPP_ASSERT(c1.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/move_assign.pass.cpp b/test/std/containers/sequences/deque/deque.cons/move_assign.pass.cpp
index 8a65bc2d2..5fcfbb8d9 100644
--- a/test/std/containers/sequences/deque/deque.cons/move_assign.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
@@ -86,4 +85,6 @@ int main()
         assert(c1.size() == 0);
         assert(c3.get_allocator() == A());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp b/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp
index 6ea72246f..1d86c14aa 100644
--- a/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::deque<MoveOnly> C;
@@ -52,4 +51,6 @@ int main()
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp b/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp
index baae755bc..8b4b4fb1f 100644
--- a/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -50,4 +49,6 @@ int main()
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/op_equal.pass.cpp b/test/std/containers/sequences/deque/deque.cons/op_equal.pass.cpp
index 6aac6b20c..c26ddec0c 100644
--- a/test/std/containers/sequences/deque/deque.cons/op_equal.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/op_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const C& x)
     assert(c == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
         int ab[] = {3, 4, 2, 8, 0, 1, 44, 34, 45, 96, 80, 1, 13, 31, 45};
@@ -60,4 +59,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<int>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/op_equal_initializer_list.pass.cpp b/test/std/containers/sequences/deque/deque.cons/op_equal_initializer_list.pass.cpp
index 117e94289..5f4150201 100644
--- a/test/std/containers/sequences/deque/deque.cons/op_equal_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/op_equal_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::deque<int> d;
@@ -38,4 +37,6 @@ int main()
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/size.pass.cpp b/test/std/containers/sequences/deque/deque.cons/size.pass.cpp
index de7894234..b69d2bb59 100644
--- a/test/std/containers/sequences/deque/deque.cons/size.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -87,7 +86,7 @@ test(unsigned n)
     test2<T, Allocator> ( n );
 }
 
-int main()
+int main(int, char**)
 {
     test<DefaultOnly, std::allocator<DefaultOnly> >(0);
     test<DefaultOnly, std::allocator<DefaultOnly> >(1);
@@ -114,4 +113,6 @@ int main()
     test3<int, min_allocator<int>> (3);
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/size_value.pass.cpp b/test/std/containers/sequences/deque/deque.cons/size_value.pass.cpp
index 2c8eee7cb..8c432182a 100644
--- a/test/std/containers/sequences/deque/deque.cons/size_value.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(unsigned n, const T& x)
         assert(*i == x);
 }
 
-int main()
+int main(int, char**)
 {
     test<int, std::allocator<int> >(0, 5);
     test<int, std::allocator<int> >(1, 10);
@@ -49,4 +48,6 @@ int main()
 #if TEST_STD_VER >= 11
     test<int, min_allocator<int> >(4095, 90);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.cons/size_value_alloc.pass.cpp b/test/std/containers/sequences/deque/deque.cons/size_value_alloc.pass.cpp
index 6706411c2..d7e4b3df9 100644
--- a/test/std/containers/sequences/deque/deque.cons/size_value_alloc.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.cons/size_value_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(unsigned n, const T& x, const Allocator& a)
         assert(*i == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     std::allocator<int> a;
@@ -65,4 +64,6 @@ int main()
     test(4097, 157, a);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp b/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp
index 9a8c698a5..2293ef205 100644
--- a/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.erasure/erase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,1}), opt(3), S({1,2,1}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::deque<int>>();
     test<std::deque<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::deque<long>>();
     test<std::deque<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp b/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp
index a090eb694..e0828a3fa 100644
--- a/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,3}), False, S({1,2,3}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::deque<int>>();
     test<std::deque<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::deque<long>>();
     test<std::deque<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/clear.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/clear.pass.cpp
index 943b6e8e1..becc36878 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/clear.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "../../../NotConstructible.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef NotConstructible T;
@@ -64,4 +63,6 @@ int main()
         assert(distance(c.begin(), c.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/emplace.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/emplace.pass.cpp
index 33a0b6df3..f4713dfdf 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/emplace.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -87,7 +86,7 @@ testN(int start, int N)
 }
 
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -103,4 +102,6 @@ int main()
         for (int j = 0; j < N; ++j)
             testN<std::deque<Emplaceable, min_allocator<Emplaceable>> >(rng[i], rng[j]);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/emplace_back.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/emplace_back.pass.cpp
index 13773fb1f..ae04c7d17 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/emplace_back.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/emplace_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ testN(int start, int N)
     test(c1);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -102,4 +101,6 @@ int main()
         c.emplace_front(1, 2, 3);
         assert(c.size() == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/emplace_front.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/emplace_front.pass.cpp
index 4c272be48..43d6c36d2 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/emplace_front.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/emplace_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,7 +75,7 @@ testN(int start, int N)
 }
 
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -103,4 +102,6 @@ int main()
         c.emplace_front(1, 2, 3);
         assert(c.size() == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/erase_iter.invalidation.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/erase_iter.invalidation.pass.cpp
index a7a93571f..54395114a 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/erase_iter.invalidation.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/erase_iter.invalidation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ void del_at_end(C c)
     assert(&*it2 == &*it4);
 }
 
-int main()
+int main(int, char**)
 {
     std::deque<int> queue;
     for (int i = 0; i < 20; ++i)
@@ -67,4 +66,6 @@ int main()
         del_at_end(queue);
         queue.pop_back();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/erase_iter.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/erase_iter.pass.cpp
index 3ed17ab3f..d8db68368 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/erase_iter.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -89,7 +88,7 @@ testN(int start, int N)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -122,4 +121,6 @@ int main()
     assert(v.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp
index a0ccd200b..3a8a06d58 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.invalidation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ void del_at_end(C c, size_t num)
 }
 
 
-int main()
+int main(int, char**)
 {
     std::deque<int> queue;
     for (int i = 0; i < 20; ++i)
@@ -75,4 +74,6 @@ int main()
         }
         queue.pop_back();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.pass.cpp
index 6556ced1a..c738748a6 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -96,7 +95,7 @@ testN(int start, int N)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -128,4 +127,6 @@ int main()
     assert(v.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/insert_iter_initializer_list.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/insert_iter_initializer_list.pass.cpp
index 6d33424fe..e0da02f7e 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/insert_iter_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/insert_iter_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::deque<int> d(10, 1);
@@ -60,4 +59,6 @@ int main()
     assert(d[12] == 1);
     assert(d[13] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp
index f843ff3a5..9a5f05476 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -260,7 +259,7 @@ test_move()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -286,4 +285,6 @@ int main()
     test_move<std::deque<MoveOnly, min_allocator<MoveOnly> > >();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/insert_rvalue.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/insert_rvalue.pass.cpp
index 4ce8bbdd5..eec8e0a49 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/insert_rvalue.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/insert_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ testN(int start, int N)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -108,4 +107,6 @@ int main()
         for (int j = 0; j < N; ++j)
             testN<std::deque<MoveOnly, min_allocator<MoveOnly>> >(rng[i], rng[j]);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/insert_size_value.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/insert_size_value.pass.cpp
index 779b9464e..0b95c8fc5 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/insert_size_value.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/insert_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -133,7 +132,7 @@ self_reference_test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -155,4 +154,6 @@ int main()
     self_reference_test<std::deque<int, min_allocator<int>> >();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/insert_value.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/insert_value.pass.cpp
index e0c2d0129..8dc0b50b5 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/insert_value.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/insert_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -115,7 +114,7 @@ self_reference_test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -135,4 +134,6 @@ int main()
     self_reference_test<std::deque<int, min_allocator<int>> >();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/pop_back.invalidation.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/pop_back.invalidation.pass.cpp
index 0f5f8e67a..7b5427b83 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/pop_back.invalidation.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/pop_back.invalidation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ void test(C c)
     assert(&*it2 == &*it4);
 }
 
-int main()
+int main(int, char**)
 {
     std::deque<int> queue;
     for (int i = 0; i < 20; ++i)
@@ -46,4 +45,6 @@ int main()
         test(queue);
         queue.pop_back();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/pop_back.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/pop_back.pass.cpp
index 2336b81d4..b0315eb54 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/pop_back.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/pop_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ testN(int start, int N)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -82,4 +81,6 @@ int main()
             testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/pop_front.invalidation.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/pop_front.invalidation.pass.cpp
index d7fd910cc..3ff1b5b9f 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/pop_front.invalidation.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/pop_front.invalidation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ void test(C c)
     assert(&*it2 == &*it4);
 }
 
-int main()
+int main(int, char**)
 {
     std::deque<int> queue;
     for (int i = 0; i < 20; ++i)
@@ -46,4 +45,6 @@ int main()
         test(queue);
         queue.pop_back();
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/pop_front.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/pop_front.pass.cpp
index 3de5586ab..9d25d1684 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/pop_front.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/pop_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ testN(int start, int N)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -82,4 +81,6 @@ int main()
             testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/push_back.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/push_back.pass.cpp
index 198cbcf67..d0a73c37f 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/push_back.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/push_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ void test(int size)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2046, 2047, 2048, 2049, 4094, 4095, 4096};
@@ -70,4 +69,6 @@ int main()
         test<std::deque<int, min_allocator<int>> >(rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/push_back_exception_safety.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/push_back_exception_safety.pass.cpp
index 4c1e15f7a..d4c46f0bc 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/push_back_exception_safety.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/push_back_exception_safety.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ CMyClass::~CMyClass() {
 
 bool operator==(const CMyClass &lhs, const CMyClass &rhs) { return lhs.equal(rhs); }
 
-int main()
+int main(int, char**)
 {
     CMyClass instance(42);
     {
@@ -99,4 +98,6 @@ int main()
         assert(vec==vec2);
     }
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/push_back_rvalue.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/push_back_rvalue.pass.cpp
index 060d83b5e..293544681 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/push_back_rvalue.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/push_back_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ void test(int size)
 }
 
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2046, 2047, 2048, 2049, 4094, 4095, 4096};
@@ -73,4 +72,6 @@ int main()
     for (int j = 0; j < N; ++j)
         test<std::deque<MoveOnly, min_allocator<MoveOnly>> >(rng[j]);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/push_front.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/push_front.pass.cpp
index ef9839721..dee483c79 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/push_front.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/push_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ testN(int start, int N)
     test(c1, -10);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -81,4 +80,6 @@ int main()
             testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/push_front_exception_safety.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/push_front_exception_safety.pass.cpp
index 0688ed025..103f2c41d 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/push_front_exception_safety.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/push_front_exception_safety.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ CMyClass::~CMyClass() {
 
 bool operator==(const CMyClass &lhs, const CMyClass &rhs) { return lhs.equal(rhs); }
 
-int main()
+int main(int, char**)
 {
     CMyClass instance(42);
     {
@@ -99,4 +98,6 @@ int main()
         assert(vec==vec2);
     }
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.modifiers/push_front_rvalue.pass.cpp b/test/std/containers/sequences/deque/deque.modifiers/push_front_rvalue.pass.cpp
index df3d2d099..7a66554d1 100644
--- a/test/std/containers/sequences/deque/deque.modifiers/push_front_rvalue.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.modifiers/push_front_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,7 +67,7 @@ testN(int start, int N)
 }
 
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -84,4 +83,6 @@ int main()
         for (int j = 0; j < N; ++j)
             testN<std::deque<MoveOnly, min_allocator<MoveOnly>> >(rng[i], rng[j]);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.special/copy.pass.cpp b/test/std/containers/sequences/deque/deque.special/copy.pass.cpp
index 846d87c6b..f861c424a 100644
--- a/test/std/containers/sequences/deque/deque.special/copy.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.special/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ void testN(int start, int N)
     assert(c1 == c2);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -85,4 +84,6 @@ int main()
             testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.special/copy_backward.pass.cpp b/test/std/containers/sequences/deque/deque.special/copy_backward.pass.cpp
index e7f37f98d..b5225ae71 100644
--- a/test/std/containers/sequences/deque/deque.special/copy_backward.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.special/copy_backward.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ void testN(int start, int N)
     assert(c1 == c2);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -84,4 +83,6 @@ int main()
             testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.special/move.pass.cpp b/test/std/containers/sequences/deque/deque.special/move.pass.cpp
index 1bdbeaf9d..d1c2a3d72 100644
--- a/test/std/containers/sequences/deque/deque.special/move.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.special/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ void testN(int start, int N)
     assert(c1 == c2);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -84,4 +83,6 @@ int main()
             testN<std::deque<int, min_allocator<int>> >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.special/move_backward.pass.cpp b/test/std/containers/sequences/deque/deque.special/move_backward.pass.cpp
index 8e909c63c..9193609d2 100644
--- a/test/std/containers/sequences/deque/deque.special/move_backward.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.special/move_backward.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ void testN(int start, int N)
     assert(c1 == c2);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -84,4 +83,6 @@ int main()
             testN<std::deque<int, min_allocator<int> > >(rng[i], rng[j]);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.special/swap.pass.cpp b/test/std/containers/sequences/deque/deque.special/swap.pass.cpp
index 05bbf878a..33910e419 100644
--- a/test/std/containers/sequences/deque/deque.special/swap.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ void testN(int start, int N, int M)
     assert(c2 == c1_save);
 }
 
-int main()
+int main(int, char**)
 {
     {
         int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
@@ -107,4 +106,6 @@ int main()
         assert(c2.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp b/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp
index 01a10964b..edbe21128 100644
--- a/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/sequences/deque/deque.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct some_alloc2
     typedef std::true_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::deque<MoveOnly> C;
@@ -86,4 +85,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/iterators.pass.cpp b/test/std/containers/sequences/deque/iterators.pass.cpp
index 5c7ae01e6..1f06ffde4 100644
--- a/test/std/containers/sequences/deque/iterators.pass.cpp
+++ b/test/std/containers/sequences/deque/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::deque<int> C;
@@ -77,4 +76,6 @@ int main()
 //         assert ( ii1 != c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/deque/types.pass.cpp b/test/std/containers/sequences/deque/types.pass.cpp
index 53b33d9e6..cfab930f3 100644
--- a/test/std/containers/sequences/deque/types.pass.cpp
+++ b/test/std/containers/sequences/deque/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ test()
         typename std::iterator_traits<typename C::const_iterator>::difference_type>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<int, test_allocator<int> >();
     test<int*, std::allocator<int*> >();
@@ -101,4 +100,6 @@ int main()
             typename std::iterator_traits<typename C::const_iterator>::difference_type>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/allocator_mismatch.fail.cpp b/test/std/containers/sequences/forwardlist/allocator_mismatch.fail.cpp
index b53075d03..42fb8da91 100644
--- a/test/std/containers/sequences/forwardlist/allocator_mismatch.fail.cpp
+++ b/test/std/containers/sequences/forwardlist/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <forward_list>
 
-int main()
+int main(int, char**)
 {
     std::forward_list<int, std::allocator<long> > fl;
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/empty.fail.cpp b/test/std/containers/sequences/forwardlist/empty.fail.cpp
index 78928b480..2ca3e024e 100644
--- a/test/std/containers/sequences/forwardlist/empty.fail.cpp
+++ b/test/std/containers/sequences/forwardlist/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::forward_list<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/empty.pass.cpp b/test/std/containers/sequences/forwardlist/empty.pass.cpp
index 1226e68ed..727904c98 100644
--- a/test/std/containers/sequences/forwardlist/empty.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::forward_list<int> C;
@@ -43,4 +42,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.access/front.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.access/front.pass.cpp
index ae14eda50..2509e9b2c 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.access/front.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.access/front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -58,4 +57,6 @@ int main()
         assert(*c.begin() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.fail.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.fail.cpp
index cd4d1ede1..bf43ee82c 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.fail.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_allocator.h"
 #include "../../../NotConstructible.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<NotConstructible> A;
@@ -27,4 +26,6 @@ int main()
         assert(c.get_allocator() == A(12));
         assert(c.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.pass.cpp
index 531afb26c..c362e2051 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "../../../NotConstructible.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<NotConstructible> A;
@@ -46,4 +45,6 @@ int main()
         assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_copy.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_copy.pass.cpp
index 244054477..e40d405c9 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_copy.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -143,4 +142,6 @@ int main()
         assert(c1.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_init.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_init.pass.cpp
index 69fb6eb4c..40405dd2e 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_init.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -65,4 +64,6 @@ int main()
             assert(*i == 10+n);
         assert(n == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_move.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_move.pass.cpp
index 61118353d..36e4ea0ca 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_move.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly T;
@@ -194,4 +193,6 @@ int main()
         assert(c1.get_allocator() == A());
         assert(c0.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_op_init.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_op_init.pass.cpp
index 84f1eb996..14c098b66 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_op_init.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_op_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -65,4 +64,6 @@ int main()
             assert(*i == 10+n);
         assert(n == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_range.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_range.pass.cpp
index ccefa2df7..c0b934445 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_range.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -75,4 +74,6 @@ int main()
         assert(n == 4);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_size_value.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_size_value.pass.cpp
index 1a1610d37..ea4cc811e 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_size_value.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/assign_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -65,4 +64,6 @@ int main()
         assert(n == 4);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/copy.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/copy.pass.cpp
index 65ab7abe2..681629a2c 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/copy.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -65,4 +64,6 @@ int main()
         assert(c.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/copy_alloc.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/copy_alloc.pass.cpp
index 744bba419..9788ca5ff 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -64,4 +63,6 @@ int main()
         assert(c.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.fail.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.fail.cpp
index ef5b20ee7..cc146316a 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.fail.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
 
@@ -39,4 +38,6 @@ int main()
 //      forward_list<allocator<int>, allocator<allocator<int>>>
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp
index c3969a462..fd49de581 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -100,4 +99,6 @@ int main()
     static_assert(std::is_same_v<decltype(fwl)::allocator_type, std::allocator<long double>>, "");
     assert(std::distance(fwl.begin(), fwl.end()) == 0); // no size for forward_list
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/default.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/default.pass.cpp
index 04c4524cf..1694faf46 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/default.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -38,4 +37,6 @@ int main()
         assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp
index 57f09d7ce..f9363feb6 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -50,4 +49,6 @@ int main()
         typedef std::forward_list<MoveOnly, some_alloc<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/default_recursive.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/default_recursive.pass.cpp
index 5ff00e6fe..98b120f53 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/default_recursive.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/default_recursive.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,6 +19,8 @@ struct X
     std::forward_list<X> q;
 };
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp
index 4d295d662..ba8799645 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_alloc
     ~some_alloc() noexcept(false);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::forward_list<MoveOnly> C;
@@ -48,4 +47,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/init.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/init.pass.cpp
index 7575c0e81..fda636073 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/init.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -38,4 +37,6 @@ int main()
             assert(*i == n);
         assert(n == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/init_alloc.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/init_alloc.pass.cpp
index cf9cbffa7..cdef7c07e 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/init_alloc.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/init_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -43,4 +42,6 @@ int main()
         assert(n == 10);
         assert(c.get_allocator() == A());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/move.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/move.pass.cpp
index 92a9e39fc..eedec3487 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/move.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly T;
@@ -68,4 +67,6 @@ int main()
         assert(c0.empty());
         assert(c.get_allocator() == A());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/move_alloc.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/move_alloc.pass.cpp
index 5f5f5d0ae..7db6a41e8 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/move_alloc.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly T;
@@ -68,4 +67,6 @@ int main()
         assert(c0.empty());
         assert(c.get_allocator() == A());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp
index d4fe25918..486c124af 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::forward_list<MoveOnly> C;
@@ -52,4 +51,6 @@ int main()
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp
index a4c776abc..5717bb891 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -50,4 +49,6 @@ int main()
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/range.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/range.pass.cpp
index 5a7137463..ce9cd59d1 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/range.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -45,4 +44,6 @@ int main()
         assert(n == std::end(t) - std::begin(t));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/range_alloc.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/range_alloc.pass.cpp
index 03d1c4530..1a85d3fee 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/range_alloc.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/range_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -51,4 +50,6 @@ int main()
         assert(c.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
index 061dd6da0..ca3931d10 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ void check_allocator(unsigned n, Allocator const &alloc = Allocator())
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     { // test that the ctor is explicit
       typedef std::forward_list<DefaultOnly> C;
@@ -71,4 +70,6 @@ int main()
         check_allocator<T, min_allocator<T>> ( 3 );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value.pass.cpp
index 56ce632e0..e3f247202 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -42,4 +41,6 @@ int main()
         assert(n == N);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value_alloc.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value_alloc.pass.cpp
index 86338a275..cc5394f5a 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value_alloc.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.cons/size_value_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<int> A;
@@ -47,4 +46,6 @@ int main()
         assert(c.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp
index 0163b8607..68a26fbc7 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,1}), opt(3), S({1,2,1}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::forward_list<int>>();
     test<std::forward_list<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::forward_list<long>>();
     test<std::forward_list<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp
index 69685d2d3..b2106b8c8 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,3}), False, S({1,2,3}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::forward_list<int>>();
     test<std::forward_list<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::forward_list<long>>();
     test<std::forward_list<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.iter/before_begin.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.iter/before_begin.pass.cpp
index c6104e733..638a78327 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.iter/before_begin.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.iter/before_begin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -101,4 +100,6 @@ int main()
         assert(std::distance(i, c.end()) == 11);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.iter/iterators.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.iter/iterators.pass.cpp
index d9daf87fb..e5441109b 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.iter/iterators.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.iter/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -143,4 +142,6 @@ int main()
 //         assert ( ii1 != c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/clear.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/clear.pass.cpp
index 6cdf8d57a..8ed29ec5a 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/clear.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "../../../NotConstructible.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef NotConstructible T;
@@ -64,4 +63,6 @@ int main()
         assert(distance(c.begin(), c.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_after.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_after.pass.cpp
index 8d7c4e989..f25812398 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_after.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_after.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "../../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef Emplaceable T;
@@ -84,4 +83,6 @@ int main()
         assert(*next(c.begin(), 3) == Emplaceable(2, 3.5));
         assert(distance(c.begin(), c.end()) == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_front.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_front.pass.cpp
index 34591a1e1..1669e0c5c 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_front.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/emplace_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "../../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef Emplaceable T;
@@ -68,4 +67,6 @@ int main()
         assert(*next(c.begin()) == Emplaceable());
         assert(distance(c.begin(), c.end()) == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_many.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_many.pass.cpp
index df859c69a..0a431a896 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_many.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -152,4 +151,6 @@ int main()
         assert(distance(c.begin(), c.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_one.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_one.pass.cpp
index bf6a88a65..59e687f6c 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_one.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/erase_after_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -94,4 +93,6 @@ int main()
         assert(distance(c.begin(), c.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_const.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_const.pass.cpp
index 82dca7394..3ba4f9e23 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_const.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -84,4 +83,6 @@ int main()
         assert(distance(c.begin(), c.end()) == 4);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_init.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_init.pass.cpp
index 90ee0d231..be5c6e517 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_init.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -70,4 +69,6 @@ int main()
         assert(*next(c.begin(), 3) == 1);
         assert(*next(c.begin(), 4) == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_range.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_range.pass.cpp
index a41f8dbbf..4cbc92edd 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_range.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -77,4 +76,6 @@ int main()
         assert(*next(c.begin(), 4) == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_rv.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_rv.pass.cpp
index 173ccaa62..2495a707a 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_rv.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly T;
@@ -85,4 +84,6 @@ int main()
         assert(*next(c.begin(), 3) == 2);
         assert(distance(c.begin(), c.end()) == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_size_value.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_size_value.pass.cpp
index f4b7e3441..7898fea92 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_size_value.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/insert_after_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -70,4 +69,6 @@ int main()
         assert(*next(c.begin(), 4) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/pop_front.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/pop_front.pass.cpp
index 545b0e68a..d28f10e81 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/pop_front.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/pop_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -71,4 +70,6 @@ int main()
         assert(distance(c.begin(), c.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_const.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_const.pass.cpp
index 4b55a0b1d..192227ee2 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_const.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -44,4 +43,6 @@ int main()
         assert(distance(c.begin(), c.end()) == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_exception_safety.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_exception_safety.pass.cpp
index bff550a0e..8b122f1f9 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_exception_safety.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_exception_safety.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ CMyClass::~CMyClass() {
     assert(fMagicValue == kFinishedConstructionMagicValue);
 }
 
-int main()
+int main(int, char**)
 {
     CMyClass instance;
     std::forward_list<CMyClass> vec;
@@ -71,4 +70,6 @@ int main()
     }
     catch (...) {
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_rv.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_rv.pass.cpp
index 7fc2b9d76..268101671 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_rv.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef MoveOnly T;
@@ -45,4 +44,6 @@ int main()
         assert(*next(c.begin()) == 1);
         assert(distance(c.begin(), c.end()) == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size.pass.cpp
index 6337cd779..ed2de9800 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef DefaultOnly T;
@@ -111,4 +110,6 @@ int main()
         assert(*next(c.begin(), 5) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size_value.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size_value.pass.cpp
index 297e2725a..f6f4027e0 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size_value.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.modifiers/resize_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "container_test_types.h"
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -99,4 +98,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/merge.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/merge.pass.cpp
index a67dd1a4b..5a55ae963 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/merge.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -45,4 +44,6 @@ int main()
         assert(c1 == c3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_pred.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_pred.pass.cpp
index 6b4e323bd..3de61a37f 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_pred.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -46,4 +45,6 @@ int main()
         assert(c1 == c3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/remove.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/remove.pass.cpp
index b7607e190..ca3ec253d 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/remove.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/remove.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct S {
     };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -152,4 +151,6 @@ int main()
         assert(c1 == c2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp
index 4c41f53fa..1b18337bc 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/remove_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ bool g(int i)
     return i < 3;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -153,4 +152,6 @@ int main()
         assert(cp.count() == static_cast<std::size_t>(std::distance(std::begin(t1), std::end(t1))));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/reverse.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/reverse.pass.cpp
index 2876f65d0..82b6813ff 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/reverse.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/reverse.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ void test(int N)
         assert(*j == i);
 }
 
-int main()
+int main(int, char**)
 {
     for (int i = 0; i < 10; ++i)
         test<std::forward_list<int> >(i);
@@ -39,4 +38,6 @@ int main()
     for (int i = 0; i < 10; ++i)
         test<std::forward_list<int, min_allocator<int>> >(i);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/sort.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/sort.pass.cpp
index 397f209f7..c76fe03ec 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/sort.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/sort.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ void test(int N)
         assert(*j == i);
 }
 
-int main()
+int main(int, char**)
 {
     for (int i = 0; i < 40; ++i)
         test<std::forward_list<int> >(i);
@@ -47,4 +46,6 @@ int main()
     for (int i = 0; i < 40; ++i)
         test<std::forward_list<int, min_allocator<int>> >(i);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/sort_pred.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/sort_pred.pass.cpp
index ab6ae6bd3..971508ac4 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/sort_pred.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/sort_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test(int N)
         assert(*j == N-1-i);
 }
 
-int main()
+int main(int, char**)
 {
     for (int i = 0; i < 40; ++i)
         test<std::forward_list<int> >(i);
@@ -48,4 +47,6 @@ int main()
     for (int i = 0; i < 40; ++i)
         test<std::forward_list<int, min_allocator<int>> >(i);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_flist.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_flist.pass.cpp
index eec9e4263..e883aee2c 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_flist.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_flist.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ testd(const C& c, int p, int l)
     assert(distance(c.begin(), c.end()) == size_t1 + l);
 }
 
-int main()
+int main(int, char**)
 {
     {
     // splicing different containers
@@ -73,4 +72,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_one.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_one.pass.cpp
index cc86c9625..87b2f60e1 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_one.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,7 +75,7 @@ tests(const C& c, int p, int f)
     assert(distance(c.begin(), c.end()) == size_t1);
 }
 
-int main()
+int main(int, char**)
 {
     {
     // splicing different containers
@@ -138,4 +137,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp
index 006869d6d..32050076c 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/splice_after_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,7 +75,7 @@ tests(const C& c, int p, int f, int l)
     assert(distance(c.begin(), c.end()) == size_t1);
 }
 
-int main()
+int main(int, char**)
 {
     {
     // splicing different containers
@@ -166,4 +165,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/unique.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/unique.pass.cpp
index e79abb6b6..07a4eae97 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/unique.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/unique.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -117,4 +116,6 @@ int main()
         assert(c1 == c2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp
index 11228afe8..87db88080 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.ops/unique_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ bool g(int x, int y)
     return x == y;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -122,4 +121,6 @@ int main()
         assert(c1 == c2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.spec/equal.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.spec/equal.pass.cpp
index 9f01fed66..a727487ed 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.spec/equal.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.spec/equal.pass.cpp
@@ -47,7 +47,7 @@ void test(int N, int M)
     }
 }
 
-int main()
+int main(int, char**)
 {
     for (int i = 0; i < 10; ++i)
         for (int j = 0; j < 10; ++j)
@@ -57,4 +57,6 @@ int main()
         for (int j = 0; j < 10; ++j)
             test<std::forward_list<int, min_allocator<int>> >(i, j);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.spec/member_swap.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.spec/member_swap.pass.cpp
index 242a00bd8..5e0438c62 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.spec/member_swap.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.spec/member_swap.pass.cpp
@@ -17,7 +17,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -256,4 +256,6 @@ int main()
         assert(c2.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.spec/non_member_swap.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.spec/non_member_swap.pass.cpp
index 44820d9d3..5b9b590d5 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.spec/non_member_swap.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.spec/non_member_swap.pass.cpp
@@ -18,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -257,4 +257,6 @@ int main()
         assert(c2.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.spec/relational.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.spec/relational.pass.cpp
index e65e064ff..29a180a96 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.spec/relational.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.spec/relational.pass.cpp
@@ -52,7 +52,7 @@ void test(int N, int M)
         assert(c1 > c2);
 }
 
-int main()
+int main(int, char**)
 {
     for (int i = 0; i < 10; ++i)
         for (int j = 0; j < 10; ++j)
@@ -62,4 +62,6 @@ int main()
         for (int j = 0; j < 10; ++j)
             test<std::forward_list<int, min_allocator<int>> >(i, j);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp b/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp
index ae48d1a4b..624795495 100644
--- a/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/forwardlist.spec/swap_noexcept.pass.cpp
@@ -53,7 +53,7 @@ struct some_alloc2
     typedef std::true_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::forward_list<MoveOnly> C;
@@ -85,4 +85,6 @@ int main()
         static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/incomplete.pass.cpp b/test/std/containers/sequences/forwardlist/incomplete.pass.cpp
index df273449e..2bdfad777 100644
--- a/test/std/containers/sequences/forwardlist/incomplete.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/incomplete.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct B {
 };
 #endif
 
-int main()
+int main(int, char**)
 {
   {
     A a;
@@ -50,4 +49,6 @@ int main()
     b.it2 = b.d.cbefore_begin();
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/max_size.pass.cpp b/test/std/containers/sequences/forwardlist/max_size.pass.cpp
index dc35ac5f5..08d21d641 100644
--- a/test/std/containers/sequences/forwardlist/max_size.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
       typedef limited_allocator<int, 10> A;
@@ -45,4 +44,6 @@ int main()
       assert(c.max_size() <= max_dist);
       assert(c.max_size() <= alloc_max_size(c.get_allocator()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/forwardlist/types.pass.cpp b/test/std/containers/sequences/forwardlist/types.pass.cpp
index 5ed7e34b9..01a7db039 100644
--- a/test/std/containers/sequences/forwardlist/types.pass.cpp
+++ b/test/std/containers/sequences/forwardlist/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 
 struct A { std::forward_list<A> v; }; // incomplete type support
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::forward_list<char> C;
@@ -73,4 +72,6 @@ int main()
         typename std::iterator_traits<typename C::const_iterator>::difference_type>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/allocator_mismatch.fail.cpp b/test/std/containers/sequences/list/allocator_mismatch.fail.cpp
index 3490d106a..39dcde477 100644
--- a/test/std/containers/sequences/list/allocator_mismatch.fail.cpp
+++ b/test/std/containers/sequences/list/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <list>
 
-int main()
+int main(int, char**)
 {
     std::list<int, std::allocator<long> > l;
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/incomplete_type.pass.cpp b/test/std/containers/sequences/list/incomplete_type.pass.cpp
index aff8f0367..e68f06176 100644
--- a/test/std/containers/sequences/list/incomplete_type.pass.cpp
+++ b/test/std/containers/sequences/list/incomplete_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,6 +21,8 @@ struct A {
     std::list<A>::const_reverse_iterator crit;
 };
 
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/iterators.pass.cpp b/test/std/containers/sequences/list/iterators.pass.cpp
index 8103b2435..0fe92dfba 100644
--- a/test/std/containers/sequences/list/iterators.pass.cpp
+++ b/test/std/containers/sequences/list/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct A
     int second;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -153,4 +152,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.capacity/empty.fail.cpp b/test/std/containers/sequences/list/list.capacity/empty.fail.cpp
index fe0387c83..0cbaa464d 100644
--- a/test/std/containers/sequences/list/list.capacity/empty.fail.cpp
+++ b/test/std/containers/sequences/list/list.capacity/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::list<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.capacity/empty.pass.cpp b/test/std/containers/sequences/list/list.capacity/empty.pass.cpp
index b564990f2..7619ec508 100644
--- a/test/std/containers/sequences/list/list.capacity/empty.pass.cpp
+++ b/test/std/containers/sequences/list/list.capacity/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::list<int> C;
@@ -43,4 +42,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp b/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp
index e8a48a2db..8560a6a87 100644
--- a/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp
+++ b/test/std/containers/sequences/list/list.capacity/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   {
     typedef limited_allocator<int, 10> A;
     typedef std::list<int, A> C;
@@ -44,4 +43,6 @@ int main() {
     assert(c.max_size() <= max_dist);
     assert(c.max_size() <= alloc_max_size(c.get_allocator()));
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.capacity/resize_size.pass.cpp b/test/std/containers/sequences/list/list.capacity/resize_size.pass.cpp
index df934699d..3c9e240d7 100644
--- a/test/std/containers/sequences/list/list.capacity/resize_size.pass.cpp
+++ b/test/std/containers/sequences/list/list.capacity/resize_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> l(5, 2);
@@ -78,4 +77,6 @@ int main()
     }
 #endif  // __LIBCPP_MOVE
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.capacity/resize_size_value.pass.cpp b/test/std/containers/sequences/list/list.capacity/resize_size_value.pass.cpp
index 4609ef986..db1c1419c 100644
--- a/test/std/containers/sequences/list/list.capacity/resize_size_value.pass.cpp
+++ b/test/std/containers/sequences/list/list.capacity/resize_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<double> l(5, 2);
@@ -50,4 +49,6 @@ int main()
         assert(l.back() == 3.5);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.capacity/size.pass.cpp b/test/std/containers/sequences/list/list.capacity/size.pass.cpp
index bddaeb5ac..d4801e76c 100644
--- a/test/std/containers/sequences/list/list.capacity/size.pass.cpp
+++ b/test/std/containers/sequences/list/list.capacity/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::list<int> C;
@@ -59,4 +58,6 @@ int main()
     assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/assign_copy.pass.cpp b/test/std/containers/sequences/list/list.cons/assign_copy.pass.cpp
index 7c8cee2a5..91ac1cfa6 100644
--- a/test/std/containers/sequences/list/list.cons/assign_copy.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int, test_allocator<int> > l(3, 2, test_allocator<int>(5));
@@ -41,4 +40,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<int>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/assign_initializer_list.pass.cpp b/test/std/containers/sequences/list/list.cons/assign_initializer_list.pass.cpp
index 4704cf40a..54c91ae4a 100644
--- a/test/std/containers/sequences/list/list.cons/assign_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<int> d;
@@ -40,4 +39,6 @@ int main()
     assert(*i++ == 5);
     assert(*i++ == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/assign_move.pass.cpp b/test/std/containers/sequences/list/list.cons/assign_move.pass.cpp
index eec214205..1e826ed91 100644
--- a/test/std/containers/sequences/list/list.cons/assign_move.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<MoveOnly, test_allocator<MoveOnly> > l(test_allocator<MoveOnly>(5));
@@ -77,4 +76,6 @@ int main()
         assert(l.empty());
         assert(l2.get_allocator() == lo.get_allocator());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/copy.pass.cpp b/test/std/containers/sequences/list/list.cons/copy.pass.cpp
index fb583a5dd..153cd2dbc 100644
--- a/test/std/containers/sequences/list/list.cons/copy.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> l(3, 2);
@@ -51,4 +50,6 @@ int main()
         assert(l2.get_allocator() == l.get_allocator());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/copy_alloc.pass.cpp b/test/std/containers/sequences/list/list.cons/copy_alloc.pass.cpp
index a164298f4..14e958502 100644
--- a/test/std/containers/sequences/list/list.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int, test_allocator<int> > l(3, 2, test_allocator<int>(5));
@@ -39,4 +38,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<int>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/deduct.fail.cpp b/test/std/containers/sequences/list/list.cons/deduct.fail.cpp
index 5708d7373..36982263d 100644
--- a/test/std/containers/sequences/list/list.cons/deduct.fail.cpp
+++ b/test/std/containers/sequences/list/list.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
 
@@ -39,4 +38,6 @@ int main()
 //      deque<allocator<int>, allocator<allocator<int>>>
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/deduct.pass.cpp b/test/std/containers/sequences/list/list.cons/deduct.pass.cpp
index b8021ef98..03d3f3818 100644
--- a/test/std/containers/sequences/list/list.cons/deduct.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -100,4 +99,6 @@ int main()
     static_assert(std::is_same_v<decltype(lst)::allocator_type, std::allocator<long double>>, "");
     assert(lst.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/default.pass.cpp b/test/std/containers/sequences/list/list.cons/default.pass.cpp
index ce04eef52..348390c45 100644
--- a/test/std/containers/sequences/list/list.cons/default.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include "DefaultOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> l;
@@ -65,4 +64,6 @@ int main()
         assert(std::distance(l.begin(), l.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp b/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp
index 7f3114d6e..93951e963 100644
--- a/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -50,4 +49,6 @@ int main()
         typedef std::list<MoveOnly, some_alloc<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/default_stack_alloc.pass.cpp b/test/std/containers/sequences/list/list.cons/default_stack_alloc.pass.cpp
index a5ff2b0c2..2e0b5203b 100644
--- a/test/std/containers/sequences/list/list.cons/default_stack_alloc.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/default_stack_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> l;
@@ -45,4 +44,6 @@ int main()
         assert(std::distance(l.begin(), l.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp b/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp
index b5ec50637..62af49e63 100644
--- a/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_alloc
     ~some_alloc() noexcept(false);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::list<MoveOnly> C;
@@ -48,4 +47,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/initializer_list.pass.cpp b/test/std/containers/sequences/list/list.cons/initializer_list.pass.cpp
index 8f04e7342..bd4ffeb13 100644
--- a/test/std/containers/sequences/list/list.cons/initializer_list.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<int> d = {3, 4, 5, 6};
@@ -38,4 +37,6 @@ int main()
     assert(*i++ == 5);
     assert(*i++ == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/initializer_list_alloc.pass.cpp b/test/std/containers/sequences/list/list.cons/initializer_list_alloc.pass.cpp
index 3388e00df..f6eca2112 100644
--- a/test/std/containers/sequences/list/list.cons/initializer_list_alloc.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/initializer_list_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<int, test_allocator<int>> d({3, 4, 5, 6}, test_allocator<int>(3));
@@ -41,4 +40,6 @@ int main()
     assert(*i++ == 5);
     assert(*i++ == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/input_iterator.pass.cpp b/test/std/containers/sequences/list/list.cons/input_iterator.pass.cpp
index d2c7fa023..f7491f450 100644
--- a/test/std/containers/sequences/list/list.cons/input_iterator.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/input_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -245,10 +244,12 @@ void test_ctor_under_alloc_with_alloc() {
 
 
 
-int main() {
+int main(int, char**) {
   basic_test();
   test_emplacable_concept();
   test_emplacable_concept_with_alloc();
   test_ctor_under_alloc();
   test_ctor_under_alloc_with_alloc();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/move.pass.cpp b/test/std/containers/sequences/list/list.cons/move.pass.cpp
index 1049b1b03..a79a37232 100644
--- a/test/std/containers/sequences/list/list.cons/move.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<MoveOnly, test_allocator<MoveOnly> > l(test_allocator<MoveOnly>(5));
@@ -60,4 +59,6 @@ int main()
         assert(l.empty());
         assert(l2.get_allocator() == lo.get_allocator());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/move_alloc.pass.cpp b/test/std/containers/sequences/list/list.cons/move_alloc.pass.cpp
index 7236f7cc6..d18ea2c4a 100644
--- a/test/std/containers/sequences/list/list.cons/move_alloc.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<MoveOnly, test_allocator<MoveOnly> > l(test_allocator<MoveOnly>(5));
@@ -73,4 +72,6 @@ int main()
         assert(l.empty());
         assert(l2.get_allocator() == min_allocator<MoveOnly>());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp b/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp
index 0d3ccfa68..c6c714595 100644
--- a/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::list<MoveOnly> C;
@@ -52,4 +51,6 @@ int main()
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp b/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp
index 878dab66f..43abd019a 100644
--- a/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -50,4 +49,6 @@ int main()
         typedef std::list<MoveOnly, some_alloc<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/op_equal_initializer_list.pass.cpp b/test/std/containers/sequences/list/list.cons/op_equal_initializer_list.pass.cpp
index b638e219d..58ea88f43 100644
--- a/test/std/containers/sequences/list/list.cons/op_equal_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/op_equal_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<int> d;
@@ -39,4 +38,6 @@ int main()
     assert(*i++ == 5);
     assert(*i++ == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/size_type.pass.cpp b/test/std/containers/sequences/list/list.cons/size_type.pass.cpp
index cbe790c0f..ef365d09f 100644
--- a/test/std/containers/sequences/list/list.cons/size_type.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/size_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ test3(unsigned n, Allocator const &alloc = Allocator())
 }
 
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> l(3);
@@ -101,4 +100,6 @@ int main()
         assert(std::distance(l.begin(), l.end()) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.cons/size_value_alloc.pass.cpp b/test/std/containers/sequences/list/list.cons/size_value_alloc.pass.cpp
index d590626d5..282de37bb 100644
--- a/test/std/containers/sequences/list/list.cons/size_value_alloc.pass.cpp
+++ b/test/std/containers/sequences/list/list.cons/size_value_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::list<int> l(3, 2);
@@ -77,4 +76,6 @@ int main()
         assert(*i == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.erasure/erase.pass.cpp b/test/std/containers/sequences/list/list.erasure/erase.pass.cpp
index a9f65c053..9c03c7282 100644
--- a/test/std/containers/sequences/list/list.erasure/erase.pass.cpp
+++ b/test/std/containers/sequences/list/list.erasure/erase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,1}), opt(3), S({1,2,1}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::list<int>>();
     test<std::list<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::list<long>>();
     test<std::list<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp b/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp
index 99b1c6530..f25d3e830 100644
--- a/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp
+++ b/test/std/containers/sequences/list/list.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,3}), False, S({1,2,3}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::list<int>>();
     test<std::list<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::list<long>>();
     test<std::list<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/clear.pass.cpp b/test/std/containers/sequences/list/list.modifiers/clear.pass.cpp
index 1d7cb80eb..0afd0a548 100644
--- a/test/std/containers/sequences/list/list.modifiers/clear.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a[] = {1, 2, 3};
@@ -35,4 +34,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/emplace.pass.cpp b/test/std/containers/sequences/list/list.modifiers/emplace.pass.cpp
index e8d469412..642e84342 100644
--- a/test/std/containers/sequences/list/list.modifiers/emplace.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ public:
     double getd() const {return d_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
     std::list<A> c;
@@ -64,4 +63,6 @@ int main()
     assert(c.back().getd() == 4.5);
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/emplace_back.pass.cpp b/test/std/containers/sequences/list/list.modifiers/emplace_back.pass.cpp
index c63b0d8fb..b7eaa7047 100644
--- a/test/std/containers/sequences/list/list.modifiers/emplace_back.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/emplace_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ public:
     double getd() const {return d_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
     std::list<A> c;
@@ -85,4 +84,6 @@ int main()
     assert(c.back().geti() == 3);
     assert(c.back().getd() == 4.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/emplace_front.pass.cpp b/test/std/containers/sequences/list/list.modifiers/emplace_front.pass.cpp
index a9be19e6f..eece4186c 100644
--- a/test/std/containers/sequences/list/list.modifiers/emplace_front.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/emplace_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ public:
     double getd() const {return d_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
     std::list<A> c;
@@ -85,4 +84,6 @@ int main()
     assert(c.back().geti() == 2);
     assert(c.back().getd() == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/erase_iter.pass.cpp b/test/std/containers/sequences/list/list.modifiers/erase_iter.pass.cpp
index 0924fdb84..87486b616 100644
--- a/test/std/containers/sequences/list/list.modifiers/erase_iter.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -62,4 +61,6 @@ int main()
     assert(distance(l1.begin(), l1.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/erase_iter_iter.pass.cpp b/test/std/containers/sequences/list/list.modifiers/erase_iter_iter.pass.cpp
index 06b4f0cc6..1df39913c 100644
--- a/test/std/containers/sequences/list/list.modifiers/erase_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     {
@@ -81,4 +80,6 @@ int main()
         assert(i == l1.begin());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/insert_iter_initializer_list.pass.cpp b/test/std/containers/sequences/list/list.modifiers/insert_iter_initializer_list.pass.cpp
index 2d5231e78..98dcd0ba2 100644
--- a/test/std/containers/sequences/list/list.modifiers/insert_iter_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/insert_iter_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<int> d(10, 1);
@@ -62,4 +61,6 @@ int main()
     assert(*i++ == 1);
     assert(*i++ == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/insert_iter_iter_iter.pass.cpp b/test/std/containers/sequences/list/list.modifiers/insert_iter_iter_iter.pass.cpp
index 18460a657..22ef0f72b 100644
--- a/test/std/containers/sequences/list/list.modifiers/insert_iter_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/insert_iter_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -82,10 +81,12 @@ void test() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::list<int> >();
 #if TEST_STD_VER >= 11
     test<std::list<int, min_allocator<int>>>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/insert_iter_rvalue.pass.cpp b/test/std/containers/sequences/list/list.modifiers/insert_iter_rvalue.pass.cpp
index 5d579fcd2..4ded48991 100644
--- a/test/std/containers/sequences/list/list.modifiers/insert_iter_rvalue.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/insert_iter_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<MoveOnly> l1;
@@ -41,4 +40,6 @@ int main()
     assert(l1.front() == MoveOnly(2));
     assert(l1.back() == MoveOnly(1));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/insert_iter_size_value.pass.cpp b/test/std/containers/sequences/list/list.modifiers/insert_iter_size_value.pass.cpp
index 9b9236965..f577fc0bc 100644
--- a/test/std/containers/sequences/list/list.modifiers/insert_iter_size_value.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/insert_iter_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,10 +44,12 @@ void test() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::list<int> >();
 #if TEST_STD_VER >= 11
     test<std::list<int, min_allocator<int>>>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/insert_iter_value.pass.cpp b/test/std/containers/sequences/list/list.modifiers/insert_iter_value.pass.cpp
index 87a033be6..10a3d9704 100644
--- a/test/std/containers/sequences/list/list.modifiers/insert_iter_value.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/insert_iter_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,10 +46,12 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::list<int> >();
 #if TEST_STD_VER >= 11
     test<std::list<int, min_allocator<int>>>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/pop_back.pass.cpp b/test/std/containers/sequences/list/list.modifiers/pop_back.pass.cpp
index c5b0277c6..c4c88d421 100644
--- a/test/std/containers/sequences/list/list.modifiers/pop_back.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/pop_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a[] = {1, 2, 3};
@@ -41,4 +40,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/pop_front.pass.cpp b/test/std/containers/sequences/list/list.modifiers/pop_front.pass.cpp
index bb3ad5469..3decb94c4 100644
--- a/test/std/containers/sequences/list/list.modifiers/pop_front.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/pop_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a[] = {1, 2, 3};
@@ -40,4 +39,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/push_back.pass.cpp b/test/std/containers/sequences/list/list.modifiers/push_back.pass.cpp
index 3b05cd729..e4aa40441 100644
--- a/test/std/containers/sequences/list/list.modifiers/push_back.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/push_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<int> c;
@@ -34,4 +33,6 @@ int main()
     assert((c == std::list<int, min_allocator<int>>(a, a+5)));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/push_back_exception_safety.pass.cpp b/test/std/containers/sequences/list/list.modifiers/push_back_exception_safety.pass.cpp
index a644955c8..a6bbc256e 100644
--- a/test/std/containers/sequences/list/list.modifiers/push_back_exception_safety.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/push_back_exception_safety.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ CMyClass::~CMyClass() {
     assert(fMagicValue == kFinishedConstructionMagicValue);
 }
 
-int main()
+int main(int, char**)
 {
     CMyClass instance;
     std::list<CMyClass> vec;
@@ -71,4 +70,6 @@ int main()
     }
     catch (...) {
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/push_back_rvalue.pass.cpp b/test/std/containers/sequences/list/list.modifiers/push_back_rvalue.pass.cpp
index 3d9d00abe..5894c2cc8 100644
--- a/test/std/containers/sequences/list/list.modifiers/push_back_rvalue.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/push_back_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<MoveOnly> l1;
@@ -41,4 +40,6 @@ int main()
     assert(l1.front() == MoveOnly(1));
     assert(l1.back() == MoveOnly(2));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/push_front.pass.cpp b/test/std/containers/sequences/list/list.modifiers/push_front.pass.cpp
index ed0ef6620..27e39e90a 100644
--- a/test/std/containers/sequences/list/list.modifiers/push_front.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/push_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<int> c;
@@ -34,4 +33,6 @@ int main()
     assert((c == std::list<int, min_allocator<int>>(a, a+5)));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/push_front_exception_safety.pass.cpp b/test/std/containers/sequences/list/list.modifiers/push_front_exception_safety.pass.cpp
index 14379b669..49f86222a 100644
--- a/test/std/containers/sequences/list/list.modifiers/push_front_exception_safety.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/push_front_exception_safety.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ CMyClass::~CMyClass() {
     assert(fMagicValue == kFinishedConstructionMagicValue);
 }
 
-int main()
+int main(int, char**)
 {
     CMyClass instance;
     std::list<CMyClass> vec;
@@ -71,4 +70,6 @@ int main()
     }
     catch (...) {
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.modifiers/push_front_rvalue.pass.cpp b/test/std/containers/sequences/list/list.modifiers/push_front_rvalue.pass.cpp
index 6fef6ade9..002011285 100644
--- a/test/std/containers/sequences/list/list.modifiers/push_front_rvalue.pass.cpp
+++ b/test/std/containers/sequences/list/list.modifiers/push_front_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::list<MoveOnly> l1;
@@ -41,4 +40,6 @@ int main()
     assert(l1.front() == MoveOnly(2));
     assert(l1.back() == MoveOnly(1));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/merge.pass.cpp b/test/std/containers/sequences/list/list.ops/merge.pass.cpp
index af4b02ce3..c2a552cf6 100644
--- a/test/std/containers/sequences/list/list.ops/merge.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 3, 7, 9, 10};
@@ -49,4 +48,6 @@ int main()
     assert(c2.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/merge_comp.pass.cpp b/test/std/containers/sequences/list/list.ops/merge_comp.pass.cpp
index 20ddbef62..911c3d09a 100644
--- a/test/std/containers/sequences/list/list.ops/merge_comp.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/merge_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {10, 9, 7, 3, 1};
@@ -49,4 +48,6 @@ int main()
     assert(c2.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/remove.pass.cpp b/test/std/containers/sequences/list/list.ops/remove.pass.cpp
index 425070ce2..dab23f041 100644
--- a/test/std/containers/sequences/list/list.ops/remove.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/remove.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct S {
   int *i_;
 };
 
-int main() {
+int main(int, char**) {
   {
     int a1[] = {1, 2, 3, 4};
     int a2[] = {1, 2, 4};
@@ -80,4 +79,6 @@ int main() {
     assert((c == std::list<int, min_allocator<int>>(a2, a2 + 3)));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp b/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp
index 1b457823d..f903278b3 100644
--- a/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/remove_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ bool g(int i)
 
 typedef unary_counting_predicate<bool(*)(int), int> Predicate;
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3, 4};
@@ -61,4 +60,6 @@ int main()
     assert(cp.count() == 4);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/reverse.pass.cpp b/test/std/containers/sequences/list/list.ops/reverse.pass.cpp
index 120caba38..0cf1242df 100644
--- a/test/std/containers/sequences/list/list.ops/reverse.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/reverse.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0};
@@ -34,4 +33,6 @@ int main()
     assert((c1 == std::list<int, min_allocator<int>>(a2, a2+sizeof(a2)/sizeof(a2[0]))));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/sort.pass.cpp b/test/std/containers/sequences/list/list.ops/sort.pass.cpp
index d51aa92dd..cd229c2d2 100644
--- a/test/std/containers/sequences/list/list.ops/sort.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/sort.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {4, 8, 1, 0, 5, 7, 2, 3, 6, 11, 10, 9};
@@ -34,4 +33,6 @@ int main()
     assert((c1 == std::list<int, min_allocator<int>>(a2, a2+sizeof(a2)/sizeof(a2[0]))));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/sort_comp.pass.cpp b/test/std/containers/sequences/list/list.ops/sort_comp.pass.cpp
index 33f2fab0d..a87e32acc 100644
--- a/test/std/containers/sequences/list/list.ops/sort_comp.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/sort_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ struct throwingLess {
 #endif
 
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {4, 8, 1, 0, 5, 7, 2, 3, 6, 11, 10, 9};
@@ -76,4 +75,6 @@ int main()
     assert((c1 == std::list<int, min_allocator<int>>(a2, a2+sizeof(a2)/sizeof(a2[0]))));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/splice_pos_list.pass.cpp b/test/std/containers/sequences/list/list.ops/splice_pos_list.pass.cpp
index 41d861da0..6a921e25e 100644
--- a/test/std/containers/sequences/list/list.ops/splice_pos_list.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/splice_pos_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     int a2[] = {4, 5, 6};
@@ -781,4 +780,6 @@ int main()
         assert(*i == 6);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/splice_pos_list_iter.pass.cpp b/test/std/containers/sequences/list/list.ops/splice_pos_list_iter.pass.cpp
index 427624a1c..9388b559f 100644
--- a/test/std/containers/sequences/list/list.ops/splice_pos_list_iter.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/splice_pos_list_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     int a2[] = {4, 5, 6};
@@ -335,4 +334,6 @@ int main()
         assert(*i == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/splice_pos_list_iter_iter.pass.cpp b/test/std/containers/sequences/list/list.ops/splice_pos_list_iter_iter.pass.cpp
index b7010636d..d22321b24 100644
--- a/test/std/containers/sequences/list/list.ops/splice_pos_list_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/splice_pos_list_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     int a2[] = {4, 5, 6};
@@ -215,4 +214,6 @@ int main()
         assert(*i == 4);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/unique.pass.cpp b/test/std/containers/sequences/list/list.ops/unique.pass.cpp
index fa85b0eae..651ffbc7b 100644
--- a/test/std/containers/sequences/list/list.ops/unique.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/unique.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {2, 1, 1, 4, 4, 4, 4, 3, 3};
@@ -34,4 +33,6 @@ int main()
     assert((c == std::list<int, min_allocator<int>>(a2, a2+4)));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp b/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp
index de6347d46..dd0bcd77b 100644
--- a/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp
+++ b/test/std/containers/sequences/list/list.ops/unique_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ bool g(int x, int y)
     return x == y;
 }
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {2, 1, 1, 4, 4, 4, 4, 3, 3};
@@ -39,4 +38,6 @@ int main()
     assert((c == std::list<int, min_allocator<int>>(a2, a2+4)));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.special/swap.pass.cpp b/test/std/containers/sequences/list/list.special/swap.pass.cpp
index 54b262572..be7df207b 100644
--- a/test/std/containers/sequences/list/list.special/swap.pass.cpp
+++ b/test/std/containers/sequences/list/list.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         int a1[] = {1, 3, 7, 9, 10};
@@ -137,4 +136,6 @@ int main()
         assert(c2.get_allocator() == A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp b/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp
index acb68f3b5..86634dd83 100644
--- a/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/sequences/list/list.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct some_alloc2
     typedef std::true_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::list<MoveOnly> C;
@@ -86,4 +85,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/list/types.pass.cpp b/test/std/containers/sequences/list/types.pass.cpp
index 8c47606fa..914f9abab 100644
--- a/test/std/containers/sequences/list/types.pass.cpp
+++ b/test/std/containers/sequences/list/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 
 struct A { std::list<A> v; }; // incomplete type support
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::list<int> C;
@@ -66,4 +65,6 @@ int main()
         typename std::iterator_traits<typename C::const_iterator>::difference_type>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/nothing_to_do.pass.cpp b/test/std/containers/sequences/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/containers/sequences/nothing_to_do.pass.cpp
+++ b/test/std/containers/sequences/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/assign_copy.pass.cpp b/test/std/containers/sequences/vector.bool/assign_copy.pass.cpp
index 54b7e84bb..5aa86839f 100644
--- a/test/std/containers/sequences/vector.bool/assign_copy.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool, test_allocator<bool> > l(3, true, test_allocator<bool>(5));
@@ -41,4 +40,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<bool>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/assign_initializer_list.pass.cpp b/test/std/containers/sequences/vector.bool/assign_initializer_list.pass.cpp
index 60146a88b..bbd980bd3 100644
--- a/test/std/containers/sequences/vector.bool/assign_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<bool> d;
@@ -38,4 +37,6 @@ int main()
     assert(d[2] == false);
     assert(d[3] == true);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/assign_move.pass.cpp b/test/std/containers/sequences/vector.bool/assign_move.pass.cpp
index 13cd65f33..b70e9cde6 100644
--- a/test/std/containers/sequences/vector.bool/assign_move.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool, test_allocator<bool> > l(test_allocator<bool>(5));
@@ -76,4 +75,6 @@ int main()
         assert(l.empty());
         assert(l2.get_allocator() == lo.get_allocator());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/capacity.pass.cpp b/test/std/containers/sequences/vector.bool/capacity.pass.cpp
index 3cbb09fe4..e24ebe00c 100644
--- a/test/std/containers/sequences/vector.bool/capacity.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/capacity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v;
@@ -41,4 +40,6 @@ int main()
         assert(v.capacity() >= 101);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/construct_default.pass.cpp b/test/std/containers/sequences/vector.bool/construct_default.pass.cpp
index 80bfce1ad..3fd2bf8d1 100644
--- a/test/std/containers/sequences/vector.bool/construct_default.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/construct_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ test1(const typename C::allocator_type& a)
     assert(c.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     {
     test0<std::vector<bool> >();
@@ -76,4 +75,6 @@ int main()
     test1<std::vector<bool, explicit_allocator<bool> > >(explicit_allocator<bool>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/construct_iter_iter.pass.cpp b/test/std/containers/sequences/vector.bool/construct_iter_iter.pass.cpp
index bad80c279..e20f30098 100644
--- a/test/std/containers/sequences/vector.bool/construct_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/construct_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(Iterator first, Iterator last)
         assert(*i == *first);
 }
 
-int main()
+int main(int, char**)
 {
     bool a[] = {0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0};
     bool* an = a + sizeof(a)/sizeof(a[0]);
@@ -47,4 +46,6 @@ int main()
     test<std::vector<bool, min_allocator<bool>> >(random_access_iterator<const bool*>(a), random_access_iterator<const bool*>(an));
     test<std::vector<bool, min_allocator<bool>> >(a, an);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/construct_iter_iter_alloc.pass.cpp b/test/std/containers/sequences/vector.bool/construct_iter_iter_alloc.pass.cpp
index dd4a5c757..2aa2b4264 100644
--- a/test/std/containers/sequences/vector.bool/construct_iter_iter_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/construct_iter_iter_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(Iterator first, Iterator last, const typename C::allocator_type& a)
         assert(*i == *first);
 }
 
-int main()
+int main(int, char**)
 {
     bool a[] = {0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0};
     bool* an = a + sizeof(a)/sizeof(a[0]);
@@ -54,4 +53,6 @@ int main()
     test<std::vector<bool, min_allocator<bool>> >(a, an, alloc);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/construct_size.pass.cpp b/test/std/containers/sequences/vector.bool/construct_size.pass.cpp
index 1fb86a24a..2763df7e1 100644
--- a/test/std/containers/sequences/vector.bool/construct_size.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/construct_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,11 +56,13 @@ test(typename C::size_type n)
     test2<C> ( n );
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<bool> >(50);
 #if TEST_STD_VER >= 11
     test<std::vector<bool, min_allocator<bool>> >(50);
     test2<std::vector<bool, test_allocator<bool>> >( 100, test_allocator<bool>(23));
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/construct_size_value.pass.cpp b/test/std/containers/sequences/vector.bool/construct_size_value.pass.cpp
index c66fd4972..068989330 100644
--- a/test/std/containers/sequences/vector.bool/construct_size_value.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/construct_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,10 +28,12 @@ test(typename C::size_type n, const typename C::value_type& x)
         assert(*i == x);
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<bool> >(50, true);
 #if TEST_STD_VER >= 11
     test<std::vector<bool, min_allocator<bool>> >(50, true);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/construct_size_value_alloc.pass.cpp b/test/std/containers/sequences/vector.bool/construct_size_value_alloc.pass.cpp
index 2ef501271..e19f3c4a9 100644
--- a/test/std/containers/sequences/vector.bool/construct_size_value_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/construct_size_value_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,10 +30,12 @@ test(typename C::size_type n, const typename C::value_type& x,
         assert(*i == x);
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<bool> >(50, true, std::allocator<bool>());
 #if TEST_STD_VER >= 11
     test<std::vector<bool, min_allocator<bool>> >(50, true, min_allocator<bool>());
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/copy.pass.cpp b/test/std/containers/sequences/vector.bool/copy.pass.cpp
index 7e2efad51..618a37faf 100644
--- a/test/std/containers/sequences/vector.bool/copy.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(const C& x)
     assert(c == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
         bool a[] = {0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0};
@@ -62,4 +61,6 @@ int main()
         assert(v2.get_allocator() == v.get_allocator());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/copy_alloc.pass.cpp b/test/std/containers/sequences/vector.bool/copy_alloc.pass.cpp
index 56ffb7d52..7970b2c7e 100644
--- a/test/std/containers/sequences/vector.bool/copy_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(const C& x, const typename C::allocator_type& a)
     assert(c == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
         bool a[] = {0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0};
@@ -61,4 +60,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<bool>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/default_noexcept.pass.cpp b/test/std/containers/sequences/vector.bool/default_noexcept.pass.cpp
index e2d94e225..800bd1b4b 100644
--- a/test/std/containers/sequences/vector.bool/default_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03
@@ -31,7 +30,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -51,4 +50,6 @@ int main()
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/dtor_noexcept.pass.cpp b/test/std/containers/sequences/vector.bool/dtor_noexcept.pass.cpp
index 5f1f5d104..949add271 100644
--- a/test/std/containers/sequences/vector.bool/dtor_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct some_alloc
     ~some_alloc() noexcept(false);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<bool> C;
@@ -47,4 +46,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/emplace.pass.cpp b/test/std/containers/sequences/vector.bool/emplace.pass.cpp
index 8a1ed0334..129cbff15 100644
--- a/test/std/containers/sequences/vector.bool/emplace.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<bool> C;
@@ -64,4 +63,6 @@ int main()
         assert(c[1] == true);
         assert(c.back() == true);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/emplace_back.pass.cpp b/test/std/containers/sequences/vector.bool/emplace_back.pass.cpp
index c737f05fd..974b7c24a 100644
--- a/test/std/containers/sequences/vector.bool/emplace_back.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/emplace_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<bool> C;
@@ -88,4 +87,6 @@ int main()
         assert(c[1] == true);
         assert(c.back() == true);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/empty.fail.cpp b/test/std/containers/sequences/vector.bool/empty.fail.cpp
index 99c245d0c..0a84eb79d 100644
--- a/test/std/containers/sequences/vector.bool/empty.fail.cpp
+++ b/test/std/containers/sequences/vector.bool/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::vector<bool> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/empty.pass.cpp b/test/std/containers/sequences/vector.bool/empty.pass.cpp
index 1471c39eb..e0c0243e1 100644
--- a/test/std/containers/sequences/vector.bool/empty.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<bool> C;
@@ -43,4 +42,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/enabled_hash.pass.cpp b/test/std/containers/sequences/vector.bool/enabled_hash.pass.cpp
index f8a8dbd8d..f6631cf2d 100644
--- a/test/std/containers/sequences/vector.bool/enabled_hash.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/enabled_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,10 +18,12 @@
 #include "poisoned_hash_helper.hpp"
 #include "min_allocator.h"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
   {
     test_hash_enabled_for_type<std::vector<bool> >();
     test_hash_enabled_for_type<std::vector<bool, min_allocator<bool>>>();
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/erase_iter.pass.cpp b/test/std/containers/sequences/vector.bool/erase_iter.pass.cpp
index 04e3dd7c2..c3d6bfd5d 100644
--- a/test/std/containers/sequences/vector.bool/erase_iter.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     bool a1[] = {1, 0, 1};
     {
@@ -62,4 +61,6 @@ int main()
     assert(distance(l1.begin(), l1.end()) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/erase_iter_iter.pass.cpp b/test/std/containers/sequences/vector.bool/erase_iter_iter.pass.cpp
index 2b9f0e31c..89763017e 100644
--- a/test/std/containers/sequences/vector.bool/erase_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     bool a1[] = {1, 0, 1};
     {
@@ -82,4 +81,6 @@ int main()
         assert(i == l1.begin());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/find.pass.cpp b/test/std/containers/sequences/vector.bool/find.pass.cpp
index d5c3f458c..883b5b4db 100644
--- a/test/std/containers/sequences/vector.bool/find.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         for (unsigned i = 1; i < 256; ++i)
@@ -39,4 +38,6 @@ int main()
             assert(b.end() == j);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/initializer_list.pass.cpp b/test/std/containers/sequences/vector.bool/initializer_list.pass.cpp
index a850fa2f1..d510b86fe 100644
--- a/test/std/containers/sequences/vector.bool/initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<bool> d = {true, false, false, true};
@@ -36,4 +35,6 @@ int main()
     assert(d[2] == false);
     assert(d[3] == true);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/initializer_list_alloc.pass.cpp b/test/std/containers/sequences/vector.bool/initializer_list_alloc.pass.cpp
index 9a2df4290..27d8420a6 100644
--- a/test/std/containers/sequences/vector.bool/initializer_list_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/initializer_list_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<bool, test_allocator<bool>> d({true, false, false, true}, test_allocator<bool>(3));
@@ -39,4 +38,6 @@ int main()
     assert(d[2] == false);
     assert(d[3] == true);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/insert_iter_initializer_list.pass.cpp b/test/std/containers/sequences/vector.bool/insert_iter_initializer_list.pass.cpp
index df4cb199b..519752da1 100644
--- a/test/std/containers/sequences/vector.bool/insert_iter_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/insert_iter_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<bool> d(10, true);
@@ -60,4 +59,6 @@ int main()
     assert(d[12] == true);
     assert(d[13] == true);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp b/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp
index dc4fe44d5..b9a921891 100644
--- a/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/insert_iter_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v(100);
@@ -126,4 +125,6 @@ int main()
             assert(v[j] == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp b/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp
index 3ec8952ff..5774ab5f6 100644
--- a/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/insert_iter_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v(100);
@@ -79,4 +78,6 @@ int main()
             assert(v[j] == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp b/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp
index 6a4a6d4bc..2502865c7 100644
--- a/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/insert_iter_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v(100);
@@ -75,4 +74,6 @@ int main()
             assert(v[j] == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/iterators.pass.cpp b/test/std/containers/sequences/vector.bool/iterators.pass.cpp
index 10b96480a..7714e53b2 100644
--- a/test/std/containers/sequences/vector.bool/iterators.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef bool T;
@@ -121,4 +120,6 @@ int main()
         assert (ii1 - cii == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/move.pass.cpp b/test/std/containers/sequences/vector.bool/move.pass.cpp
index b3663c759..4de0604c6 100644
--- a/test/std/containers/sequences/vector.bool/move.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool, test_allocator<bool> > l(test_allocator<bool>(5));
@@ -90,4 +89,6 @@ int main()
         assert(a.get_data() == 42);
       }
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/move_alloc.pass.cpp b/test/std/containers/sequences/vector.bool/move_alloc.pass.cpp
index b3b6f9649..f2ff5303b 100644
--- a/test/std/containers/sequences/vector.bool/move_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool, test_allocator<bool> > l(test_allocator<bool>(5));
@@ -72,4 +71,6 @@ int main()
         assert(l.empty());
         assert(l2.get_allocator() == min_allocator<bool>());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/move_assign_noexcept.pass.cpp b/test/std/containers/sequences/vector.bool/move_assign_noexcept.pass.cpp
index 556b6e656..6c7fcfca7 100644
--- a/test/std/containers/sequences/vector.bool/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -98,4 +97,6 @@ int main()
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/move_noexcept.pass.cpp b/test/std/containers/sequences/vector.bool/move_noexcept.pass.cpp
index f104eb32e..a59e1a8eb 100644
--- a/test/std/containers/sequences/vector.bool/move_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -57,4 +56,6 @@ int main()
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/op_equal_initializer_list.pass.cpp b/test/std/containers/sequences/vector.bool/op_equal_initializer_list.pass.cpp
index 61874338d..22384fe8d 100644
--- a/test/std/containers/sequences/vector.bool/op_equal_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/op_equal_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<bool> d;
@@ -38,4 +37,6 @@ int main()
     assert(d[2] == false);
     assert(d[3] == true);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/push_back.pass.cpp b/test/std/containers/sequences/vector.bool/push_back.pass.cpp
index c482f4945..438869be1 100644
--- a/test/std/containers/sequences/vector.bool/push_back.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/push_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         bool a[] = {0, 1, 1, 0, 1, 0, 0};
@@ -46,4 +45,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/reference.swap.pass.cpp b/test/std/containers/sequences/vector.bool/reference.swap.pass.cpp
index 8fe18d4b4..c41bac188 100644
--- a/test/std/containers/sequences/vector.bool/reference.swap.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/reference.swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 
     bool a[] = {false, true, false, true};
@@ -36,4 +35,6 @@ int main()
     v.swap(r1, r2);
     assert( r1);
     assert(!r2);
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/reserve.pass.cpp b/test/std/containers/sequences/vector.bool/reserve.pass.cpp
index 489ca95ee..039c1bc18 100644
--- a/test/std/containers/sequences/vector.bool/reserve.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/reserve.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v;
@@ -51,4 +50,6 @@ int main()
         assert(v.capacity() >= 150);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/resize_size.pass.cpp b/test/std/containers/sequences/vector.bool/resize_size.pass.cpp
index bc51e0bbb..53e83ac7e 100644
--- a/test/std/containers/sequences/vector.bool/resize_size.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/resize_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v(100);
@@ -47,4 +46,6 @@ int main()
         assert(v.capacity() >= 400);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/resize_size_value.pass.cpp b/test/std/containers/sequences/vector.bool/resize_size_value.pass.cpp
index 919000732..ef0cb6160 100644
--- a/test/std/containers/sequences/vector.bool/resize_size_value.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/resize_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v(100);
@@ -49,4 +48,6 @@ int main()
             assert(v[i] == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/shrink_to_fit.pass.cpp b/test/std/containers/sequences/vector.bool/shrink_to_fit.pass.cpp
index 03997cbec..59714d5fb 100644
--- a/test/std/containers/sequences/vector.bool/shrink_to_fit.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/shrink_to_fit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v(100);
@@ -35,4 +34,6 @@ int main()
         assert(v.size() >= 101);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/size.pass.cpp b/test/std/containers/sequences/vector.bool/size.pass.cpp
index 43330c0a5..db737c930 100644
--- a/test/std/containers/sequences/vector.bool/size.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<bool> C;
@@ -59,4 +58,6 @@ int main()
     assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/swap.pass.cpp b/test/std/containers/sequences/vector.bool/swap.pass.cpp
index 60b612ae4..9ff11113d 100644
--- a/test/std/containers/sequences/vector.bool/swap.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<bool> v1(100);
@@ -95,4 +94,6 @@ int main()
         assert(v[1] == true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/swap_noexcept.pass.cpp b/test/std/containers/sequences/vector.bool/swap_noexcept.pass.cpp
index 68d04dbb3..e346c2998 100644
--- a/test/std/containers/sequences/vector.bool/swap_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct some_alloc2
     typedef std::true_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -90,4 +89,6 @@ int main()
     }
 #endif // _LIBCPP_VERSION
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/types.pass.cpp b/test/std/containers/sequences/vector.bool/types.pass.cpp
index 4e8edc889..d15973a38 100644
--- a/test/std/containers/sequences/vector.bool/types.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,7 +67,7 @@ test()
         std::reverse_iterator<typename C::const_iterator> >::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<test_allocator<bool> >();
     test<std::allocator<bool> >();
@@ -77,4 +76,6 @@ int main()
 #if TEST_STD_VER >= 11
     test<min_allocator<bool> >();
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector.bool/vector_bool.pass.cpp b/test/std/containers/sequences/vector.bool/vector_bool.pass.cpp
index 89f5a6645..5f9ae3dec 100644
--- a/test/std/containers/sequences/vector.bool/vector_bool.pass.cpp
+++ b/test/std/containers/sequences/vector.bool/vector_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<bool> T;
@@ -51,4 +50,6 @@ int main()
     assert(h(vb) != 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/allocator_mismatch.fail.cpp b/test/std/containers/sequences/vector/allocator_mismatch.fail.cpp
index 65fdb63ee..0c57f16be 100644
--- a/test/std/containers/sequences/vector/allocator_mismatch.fail.cpp
+++ b/test/std/containers/sequences/vector/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <vector>
 
-int main()
+int main(int, char**)
 {
     std::vector<int, std::allocator<long> > v;
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/contiguous.pass.cpp b/test/std/containers/sequences/vector/contiguous.pass.cpp
index 9dfcf7a63..99d9d6eca 100644
--- a/test/std/containers/sequences/vector/contiguous.pass.cpp
+++ b/test/std/containers/sequences/vector/contiguous.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ void test_contiguous ( const C &c )
         assert ( *(c.begin() + static_cast<typename C::difference_type>(i)) == *(std::addressof(*c.begin()) + i));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -49,4 +48,6 @@ int main()
     test_contiguous(C(9, 11.0, A{}));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/iterators.pass.cpp b/test/std/containers/sequences/vector/iterators.pass.cpp
index 33093e151..296c551f7 100644
--- a/test/std/containers/sequences/vector/iterators.pass.cpp
+++ b/test/std/containers/sequences/vector/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct A
     int second;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -167,4 +166,6 @@ int main()
         assert (ii1 - cii == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/types.pass.cpp b/test/std/containers/sequences/vector/types.pass.cpp
index 2080ac09f..0a04c2552 100644
--- a/test/std/containers/sequences/vector/types.pass.cpp
+++ b/test/std/containers/sequences/vector/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -79,7 +78,7 @@ test()
         std::reverse_iterator<typename C::const_iterator> >::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<int, test_allocator<int> >();
     test<int*, std::allocator<int*> >();
@@ -105,4 +104,6 @@ int main()
 //         typename std::iterator_traits<typename C::const_iterator>::difference_type>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/capacity.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/capacity.pass.cpp
index a87b84061..a8ee9f229 100644
--- a/test/std/containers/sequences/vector/vector.capacity/capacity.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/capacity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v;
@@ -45,4 +44,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/empty.fail.cpp b/test/std/containers/sequences/vector/vector.capacity/empty.fail.cpp
index abfdfbfb9..0f7dc6c64 100644
--- a/test/std/containers/sequences/vector/vector.capacity/empty.fail.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::vector<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp
index d81683133..cce2602bd 100644
--- a/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<int> C;
@@ -43,4 +42,6 @@ int main()
     assert(c.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp
index 3ab5cc6a8..c9cc6d582 100644
--- a/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "test_macros.h"
 
 
-int main() {
+int main(int, char**) {
   {
     typedef limited_allocator<int, 10> A;
     typedef std::vector<int, A> C;
@@ -45,4 +44,6 @@ int main() {
     assert(c.max_size() <= max_dist);
     assert(c.max_size() <= alloc_max_size(c.get_allocator()));
   }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp
index abaa709d4..4cf3b2d33 100644
--- a/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/reserve.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v;
@@ -67,4 +66,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp
index 273bdad9a..41188acb7 100644
--- a/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/resize_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v(100);
@@ -81,4 +80,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp
index 0bb909710..4d9f7931d 100644
--- a/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/resize_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v(100);
@@ -74,4 +73,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
index daf9b092f..36125bb93 100644
--- a/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v(100);
@@ -59,4 +58,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp
index 71f531c48..373a7069f 100644
--- a/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<int> C;
@@ -59,4 +58,6 @@ int main()
     assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp b/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp
index 59529a6df..e2fa0d8b9 100644
--- a/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.capacity/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v1(100);
@@ -47,4 +46,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp b/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp
index d15d24dd9..f6d8dd50b 100644
--- a/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int, test_allocator<int> > l(3, 2, test_allocator<int>(5));
@@ -41,4 +40,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<int>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/assign_initializer_list.pass.cpp b/test/std/containers/sequences/vector/vector.cons/assign_initializer_list.pass.cpp
index 853f75583..4673df955 100644
--- a/test/std/containers/sequences/vector/vector.cons/assign_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/assign_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ void test ( Vec &v )
     assert(v[3] == 6);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<int> V;
@@ -49,4 +48,6 @@ int main()
     test(d1);
     test(d2);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp b/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp
index f07495637..df8450210 100644
--- a/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/assign_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,9 @@ void test_emplaceable_concept() {
 
 
 
-int main()
+int main(int, char**)
 {
     test_emplaceable_concept();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp b/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp
index c2b6b8378..4b70c7843 100644
--- a/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<MoveOnly, test_allocator<MoveOnly> > l(test_allocator<MoveOnly>(5));
@@ -96,4 +95,6 @@ int main()
         assert(l2.get_allocator() == lo.get_allocator());
         assert(is_contiguous_container_asan_correct(l2));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/assign_size_value.pass.cpp b/test/std/containers/sequences/vector/vector.cons/assign_size_value.pass.cpp
index 8e5d2766c..b85238db9 100644
--- a/test/std/containers/sequences/vector/vector.cons/assign_size_value.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/assign_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ void test ( Vec &v )
     assert(std::all_of(v.begin(), v.end(), is6));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<int> V;
@@ -51,4 +50,6 @@ int main()
     test(d2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/construct_default.pass.cpp b/test/std/containers/sequences/vector/vector.cons/construct_default.pass.cpp
index a71f5b32c..346c357d3 100644
--- a/test/std/containers/sequences/vector/vector.cons/construct_default.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/construct_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ test1(const typename C::allocator_type& a)
     LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
 }
 
-int main()
+int main(int, char**)
 {
     {
     test0<std::vector<int> >();
@@ -99,4 +98,6 @@ int main()
         assert(v.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp b/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
index 21a7df4a7..8f8ffa82c 100644
--- a/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -146,9 +145,42 @@ void test_ctor_under_alloc() {
 #endif
 }
 
+// Initialize a vector with a different value type.
+void test_ctor_with_different_value_type() {
+  {
+    // Make sure initialization is performed with each element value, not with
+    // a memory blob.
+    float array[3] = {0.0f, 1.0f, 2.0f};
+    std::vector<int> v(array, array + 3);
+    assert(v[0] == 0);
+    assert(v[1] == 1);
+    assert(v[2] == 2);
+  }
+  struct X { int x; };
+  struct Y { int y; };
+  struct Z : X, Y { int z; };
+  {
+    Z z;
+    Z *array[1] = { &z };
+    // Though the types Z* and Y* are very similar, initialization still cannot
+    // be done with `memcpy`.
+    std::vector<Y*> v(array, array + 1);
+    assert(v[0] == &z);
+  }
+  {
+    // Though the types are different, initialization can be done with `memcpy`.
+    int32_t array[1] = { -1 };
+    std::vector<uint32_t> v(array, array + 1);
+    assert(v[0] == 4294967295);
+  }
+}
+
 
-int main() {
+int main(int, char**) {
   basic_test_cases();
   emplaceable_concept_tests(); // See PR34898
   test_ctor_under_alloc();
+  test_ctor_with_different_value_type();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp b/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
index 15498ba41..3a97b43b7 100644
--- a/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -163,8 +162,10 @@ void test_ctor_under_alloc() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   basic_tests();
   emplaceable_concept_tests(); // See PR34898
   test_ctor_under_alloc();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp b/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp
index 7416a6ac9..f111220d3 100644
--- a/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/construct_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ test(typename C::size_type n)
     test2<C> ( n );
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int> >(50);
     test<std::vector<DefaultOnly> >(500);
@@ -72,4 +71,6 @@ int main()
     test2<std::vector<DefaultOnly, test_allocator<DefaultOnly>> >( 100, test_allocator<DefaultOnly>(23));
     assert(DefaultOnly::count == 0);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp b/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp
index dcaaa2cd4..0839883a9 100644
--- a/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/construct_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(typename C::size_type n, const typename C::value_type& x)
         assert(*i == x);
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int> >(50, 3);
     // Add 1 for implementations that dynamically allocate a container proxy.
@@ -39,4 +38,6 @@ int main()
 #if TEST_STD_VER >= 11
     test<std::vector<int, min_allocator<int>> >(50, 3);
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp b/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp
index 4713aa157..1de088534 100644
--- a/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/construct_size_value_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,10 +31,12 @@ test(typename C::size_type n, const typename C::value_type& x,
         assert(*i == x);
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int> >(50, 3, std::allocator<int>());
 #if TEST_STD_VER >= 11
     test<std::vector<int, min_allocator<int>> >(50, 3, min_allocator<int>());
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp b/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp
index 887444c81..844da3841 100644
--- a/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(const C& x)
     LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
 }
 
-int main()
+int main(int, char**)
 {
     {
         int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 1, 0};
@@ -75,4 +74,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp b/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp
index bf910df05..79b484f78 100644
--- a/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(const C& x, const typename C::allocator_type& a)
     LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
 }
 
-int main()
+int main(int, char**)
 {
     {
         int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 1, 0};
@@ -63,4 +62,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<int>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/deduct.fail.cpp b/test/std/containers/sequences/vector/vector.cons/deduct.fail.cpp
index d47980012..beb10498c 100644
--- a/test/std/containers/sequences/vector/vector.cons/deduct.fail.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <cstddef>
 
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
 
@@ -37,4 +36,6 @@ int main()
 //      deque<allocator<int>, allocator<allocator<int>>>
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/deduct.pass.cpp b/test/std/containers/sequences/vector/vector.cons/deduct.pass.cpp
index 175fede78..e6b59b40c 100644
--- a/test/std/containers/sequences/vector/vector.cons/deduct.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -113,4 +112,6 @@ int main()
     static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<bool>>, "");
     assert(vec.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/default.recursive.pass.cpp b/test/std/containers/sequences/vector/vector.cons/default.recursive.pass.cpp
index 1a4a1898c..1558ea4b6 100644
--- a/test/std/containers/sequences/vector/vector.cons/default.recursive.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/default.recursive.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,6 +17,8 @@ struct X
     std::vector<X> q;
 };
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp b/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp
index f8c932a02..91434964b 100644
--- a/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03
@@ -30,7 +29,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<MoveOnly> C;
@@ -48,4 +47,6 @@ int main()
         typedef std::vector<MoveOnly, some_alloc<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp b/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp
index 172086694..f4c05b6e2 100644
--- a/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct some_alloc
     ~some_alloc() noexcept(false);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<MoveOnly> C;
@@ -48,4 +47,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp b/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp
index edbad8c0d..168e3b58b 100644
--- a/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<int> d = {3, 4, 5, 6};
@@ -38,4 +37,6 @@ int main()
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp b/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp
index ac5d0178e..633b5c5e2 100644
--- a/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/initializer_list_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<int, test_allocator<int>> d({3, 4, 5, 6}, test_allocator<int>(3));
@@ -42,4 +41,6 @@ int main()
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/move.pass.cpp b/test/std/containers/sequences/vector/vector.cons/move.pass.cpp
index 330bcda8b..938857458 100644
--- a/test/std/containers/sequences/vector/vector.cons/move.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<MoveOnly, test_allocator<MoveOnly> > l(test_allocator<MoveOnly>(5));
@@ -130,4 +129,6 @@ int main()
         assert(a.get_data() == 42);
       }
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp b/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp
index 767a0ce3d..2f15a14e8 100644
--- a/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<MoveOnly, test_allocator<MoveOnly> > l(test_allocator<MoveOnly>(5));
@@ -94,4 +93,6 @@ int main()
         assert(l2.get_allocator() == min_allocator<MoveOnly>());
         assert(is_contiguous_container_asan_correct(l2));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp b/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp
index 14ca7155b..c5c5e29cd 100644
--- a/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ struct some_alloc3
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<MoveOnly> C;
@@ -92,4 +91,6 @@ int main()
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp b/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp
index a1e3a632f..122841428 100644
--- a/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct some_alloc
     some_alloc(const some_alloc&);
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<MoveOnly> C;
@@ -52,4 +51,6 @@ int main()
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.cons/op_equal_initializer_list.pass.cpp b/test/std/containers/sequences/vector/vector.cons/op_equal_initializer_list.pass.cpp
index 21dd5c384..61c20b7c7 100644
--- a/test/std/containers/sequences/vector/vector.cons/op_equal_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.cons/op_equal_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<int> d;
@@ -41,4 +40,6 @@ int main()
     assert(d[2] == 5);
     assert(d[3] == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.data/data.pass.cpp b/test/std/containers/sequences/vector/vector.data/data.pass.cpp
index 0fc335f15..3477c5eb1 100644
--- a/test/std/containers/sequences/vector/vector.data/data.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.data/data.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct Nasty {
     int i_;
     };
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v;
@@ -60,4 +59,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp b/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp
index fa8b6a8af..ec5016d2f 100644
--- a/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.data/data_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct Nasty {
     int i_;
     };
 
-int main()
+int main(int, char**)
 {
     {
         const std::vector<int> v;
@@ -60,4 +59,6 @@ int main()
         assert(is_contiguous_container_asan_correct(v));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp b/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp
index e88252f1d..00676b52d 100644
--- a/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,1}), opt(3), S({1,2,1}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int>>();
     test<std::vector<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::vector<long>>();
     test<std::vector<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp b/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp
index 8025a3407..10d66a29b 100644
--- a/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -67,7 +66,7 @@ void test()
     test0(S({1,2,3}), False, S({1,2,3}));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int>>();
     test<std::vector<int, min_allocator<int>>> ();
@@ -75,4 +74,6 @@ int main()
 
     test<std::vector<long>>();
     test<std::vector<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp
index 5357ba4cb..334c67adc 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
     int a[] = {1, 2, 3};
@@ -40,4 +39,6 @@ int main()
     LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp
index d08f4e3c4..1279fba4c 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ public:
     double getd() const {return d_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<A> c;
@@ -133,4 +132,6 @@ int main()
         assert(c.back().geti() == 3);
         assert(c.back().getd() == 4.5);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp
index f70c9b9ab..435be207b 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/emplace_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
     double getd() const {return d_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<A> c;
@@ -145,4 +144,6 @@ int main()
         assert(c.size() == 2);
         assert(is_contiguous_container_asan_correct(c));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp
index e5e0277fa..ec5f77856 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/emplace_extra.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v;
@@ -57,4 +56,6 @@ int main()
         assert(v[0] == 3);
         assert(is_contiguous_container_asan_correct(v));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/erase_iter.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/erase_iter.pass.cpp
index 785a5be8b..aac35f9f8 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/erase_iter.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/erase_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct Throws {
 bool Throws::sThrows = false;
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -100,4 +99,6 @@ int main()
     assert(v.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/erase_iter_iter.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/erase_iter_iter.pass.cpp
index 2fc4981b6..7682000d7 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/erase_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/erase_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct Throws {
 bool Throws::sThrows = false;
 #endif
 
-int main()
+int main(int, char**)
 {
     int a1[] = {1, 2, 3};
     {
@@ -153,4 +152,6 @@ int main()
     assert(v.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_initializer_list.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_initializer_list.pass.cpp
index 9072d427c..30d0cd686 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_initializer_list.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::vector<int> d(10, 1);
@@ -63,4 +62,6 @@ int main()
     assert(d[12] == 1);
     assert(d[13] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp
index b54a96d0b..74cb612aa 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<int> V;
@@ -172,4 +171,6 @@ int main()
             assert(v[j] == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp
index 8794d9245..780bd9c48 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<MoveOnly> v(100);
@@ -63,4 +62,6 @@ int main()
         for (++j; j < 101; ++j)
             assert(v[j] == MoveOnly());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp
index b6fc9ac73..5b182f44d 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_size_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v(100);
@@ -112,4 +111,6 @@ int main()
             assert(v[j] == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_value.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_value.pass.cpp
index 5010f8949..2edadd0fe 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/insert_iter_value.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/insert_iter_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> v(100);
@@ -94,4 +93,6 @@ int main()
             assert(v[j] == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/pop_back.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/pop_back.pass.cpp
index c44023827..db2337c27 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/pop_back.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/pop_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "min_allocator.h"
 
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> c;
@@ -38,4 +37,6 @@ int main()
         assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/push_back.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/push_back.pass.cpp
index 3b568b7e0..d22136ddb 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/push_back.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/push_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<int> c;
@@ -109,4 +108,6 @@ int main()
             assert(c[j] == j);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/push_back_exception_safety.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/push_back_exception_safety.pass.cpp
index eabe029a3..9e2561129 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/push_back_exception_safety.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/push_back_exception_safety.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ CMyClass::~CMyClass() {
 
 bool operator==(const CMyClass &lhs, const CMyClass &rhs) { return lhs.equal(rhs); }
 
-int main()
+int main(int, char**)
 {
     CMyClass instance(42);
     std::vector<CMyClass> vec;
@@ -86,4 +85,6 @@ int main()
         assert(is_contiguous_container_asan_correct(vec));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.modifiers/push_back_rvalue.pass.cpp b/test/std/containers/sequences/vector/vector.modifiers/push_back_rvalue.pass.cpp
index ac1fffd9d..d876eb617 100644
--- a/test/std/containers/sequences/vector/vector.modifiers/push_back_rvalue.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.modifiers/push_back_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::vector<MoveOnly> c;
@@ -110,4 +109,6 @@ int main()
         for (int j = 0; static_cast<std::size_t>(j) < c.size(); ++j)
             assert(c[j] == MoveOnly(j));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.special/swap.pass.cpp b/test/std/containers/sequences/vector/vector.special/swap.pass.cpp
index 0f42d891a..2ded4fe75 100644
--- a/test/std/containers/sequences/vector/vector.special/swap.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "min_allocator.h"
 #include "asan_testing.h"
 
-int main()
+int main(int, char**)
 {
     {
         int a1[] = {1, 3, 7, 9, 10};
@@ -179,4 +178,6 @@ int main()
         assert(is_contiguous_container_asan_correct(c2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/sequences/vector/vector.special/swap_noexcept.pass.cpp b/test/std/containers/sequences/vector/vector.special/swap_noexcept.pass.cpp
index 062ee22c3..40205b67c 100644
--- a/test/std/containers/sequences/vector/vector.special/swap_noexcept.pass.cpp
+++ b/test/std/containers/sequences/vector/vector.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ struct some_alloc2
     typedef std::true_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::vector<MoveOnly> C;
@@ -86,4 +85,6 @@ int main()
         static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/set_allocator_requirement_test_templates.h b/test/std/containers/set_allocator_requirement_test_templates.h
index 517c36d8e..992b32b9b 100644
--- a/test/std/containers/set_allocator_requirement_test_templates.h
+++ b/test/std/containers/set_allocator_requirement_test_templates.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SET_ALLOCATOR_REQUIREMENT_TEST_TEMPLATES_H
diff --git a/test/std/containers/test_compare.h b/test/std/containers/test_compare.h
index 32d831d40..3ce680d03 100644
--- a/test/std/containers/test_compare.h
+++ b/test/std/containers/test_compare.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/containers/test_hash.h b/test/std/containers/test_hash.h
index 1a70e7cbd..b37b24908 100644
--- a/test/std/containers/test_hash.h
+++ b/test/std/containers/test_hash.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/containers/unord/iterator_difference_type.pass.cpp b/test/std/containers/unord/iterator_difference_type.pass.cpp
index 35bcc2794..fc5ccbee3 100644
--- a/test/std/containers/unord/iterator_difference_type.pass.cpp
+++ b/test/std/containers/unord/iterator_difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,10 +51,10 @@ void testUnorderedMap() {
 
 template <class Set, class ValueTp, class CPtrT>
 void testUnorderedSet() {
-  static_assert((std::is_same<typename Set::iterator,
-                             typename Set::const_iterator>::value), "");
-  static_assert((std::is_same<typename Set::local_iterator,
-                             typename Set::const_local_iterator>::value), "");
+  static_assert((std::is_convertible<typename Set::iterator,
+                                     typename Set::const_iterator>::value), "");
+  static_assert((std::is_convertible<typename Set::local_iterator,
+                                     typename Set::const_local_iterator>::value), "");
   typedef typename Set::difference_type Diff;
   {
     typedef typename Set::iterator It;
@@ -74,7 +73,7 @@ void testUnorderedSet() {
   }
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef std::unordered_map<int, int> Map;
     typedef std::pair<const int, int> ValueTp;
@@ -151,4 +150,6 @@ int main() {
     testUnorderedSet<Set, ValueTp, min_pointer<const ValueTp>>();
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/allocator_mismatch.fail.cpp b/test/std/containers/unord/unord.map/allocator_mismatch.fail.cpp
index 39fcb11ad..705922042 100644
--- a/test/std/containers/unord/unord.map/allocator_mismatch.fail.cpp
+++ b/test/std/containers/unord/unord.map/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <unordered_map>
 
-int main()
+int main(int, char**)
 {
     std::unordered_map<int, int, std::hash<int>, std::less<int>, std::allocator<long> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/bucket.pass.cpp b/test/std/containers/unord/unord.map/bucket.pass.cpp
index 8931fdf64..522b70976 100644
--- a/test/std/containers/unord/unord.map/bucket.pass.cpp
+++ b/test/std/containers/unord/unord.map/bucket.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -75,4 +74,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/bucket_count.pass.cpp b/test/std/containers/unord/unord.map/bucket_count.pass.cpp
index 9ab8bfd19..ee1a12523 100644
--- a/test/std/containers/unord/unord.map/bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.map/bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -72,4 +71,6 @@ int main()
         assert(c.bucket_count() >= 8);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/bucket_size.pass.cpp b/test/std/containers/unord/unord.map/bucket_size.pass.cpp
index af25de4db..439d2b533 100644
--- a/test/std/containers/unord/unord.map/bucket_size.pass.cpp
+++ b/test/std/containers/unord/unord.map/bucket_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -79,4 +78,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/compare.pass.cpp b/test/std/containers/unord/unord.map/compare.pass.cpp
index cffc1dbd4..7d6cbf9a8 100644
--- a/test/std/containers/unord/unord.map/compare.pass.cpp
+++ b/test/std/containers/unord/unord.map/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,8 +32,7 @@ namespace std
     };
 }
 
-int
-main()
+int main(int, char**)
 {
     typedef std::unordered_map<Key, int> MapT;
     typedef MapT::iterator Iter;
@@ -44,4 +42,6 @@ main()
     std::pair<Iter, bool> result = map.insert(std::make_pair(Key(0), 42));
     assert(result.second);
     assert(result.first->second == 42);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/count.pass.cpp b/test/std/containers/unord/unord.map/count.pass.cpp
index 68661b56d..1a1bea90b 100644
--- a/test/std/containers/unord/unord.map/count.pass.cpp
+++ b/test/std/containers/unord/unord.map/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -62,4 +61,6 @@ int main()
         assert(c.count(5) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/empty.fail.cpp b/test/std/containers/unord/unord.map/empty.fail.cpp
index 1c67169bb..283d6fa3e 100644
--- a/test/std/containers/unord/unord.map/empty.fail.cpp
+++ b/test/std/containers/unord/unord.map/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::unordered_map<int, int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/empty.pass.cpp b/test/std/containers/unord/unord.map/empty.pass.cpp
index 4488b20b3..da6d48df2 100644
--- a/test/std/containers/unord/unord.map/empty.pass.cpp
+++ b/test/std/containers/unord/unord.map/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_map<int, double> M;
@@ -43,4 +42,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/eq.pass.cpp b/test/std/containers/unord/unord.map/eq.pass.cpp
index 5dcea6a73..d284e822a 100644
--- a/test/std/containers/unord/unord.map/eq.pass.cpp
+++ b/test/std/containers/unord/unord.map/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -160,4 +159,6 @@ int main()
         assert(!(c1 != c2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/equal_range_const.pass.cpp b/test/std/containers/unord/unord.map/equal_range_const.pass.cpp
index 46e04fde2..b9dd9a64e 100644
--- a/test/std/containers/unord/unord.map/equal_range_const.pass.cpp
+++ b/test/std/containers/unord/unord.map/equal_range_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -72,4 +71,6 @@ int main()
         assert(std::distance(r.first, r.second) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/equal_range_non_const.pass.cpp b/test/std/containers/unord/unord.map/equal_range_non_const.pass.cpp
index 8d7f34a0b..029222d5c 100644
--- a/test/std/containers/unord/unord.map/equal_range_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.map/equal_range_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -72,4 +71,6 @@ int main()
         assert(std::distance(r.first, r.second) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/erase_if.pass.cpp b/test/std/containers/unord/unord.map/erase_if.pass.cpp
index f6a580c21..5498f4543 100644
--- a/test/std/containers/unord/unord.map/erase_if.pass.cpp
+++ b/test/std/containers/unord/unord.map/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -68,7 +67,7 @@ void test()
     test0<S>({1,2,3}, False, {1,2,3});
 }
 
-int main()
+int main(int, char**)
 {
     test<std::unordered_map<int, int>>();
     test<std::unordered_map<int, int, std::hash<int>, std::equal_to<int>, min_allocator<std::pair<const int, int>>>> ();
@@ -76,5 +75,7 @@ int main()
 
     test<std::unordered_map<long, short>>();
     test<std::unordered_map<short, double>>();
+
+  return 0;
 }
 
diff --git a/test/std/containers/unord/unord.map/find_const.pass.cpp b/test/std/containers/unord/unord.map/find_const.pass.cpp
index 0f0ea68bd..1d63b4be2 100644
--- a/test/std/containers/unord/unord.map/find_const.pass.cpp
+++ b/test/std/containers/unord/unord.map/find_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -68,4 +67,6 @@ int main()
         assert(i == c.cend());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/find_non_const.pass.cpp b/test/std/containers/unord/unord.map/find_non_const.pass.cpp
index cbce62dab..58a9cd35a 100644
--- a/test/std/containers/unord/unord.map/find_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.map/find_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -68,4 +67,6 @@ int main()
         assert(i == c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/incomplete_type.pass.cpp b/test/std/containers/unord/unord.map/incomplete_type.pass.cpp
index 9fc0fd471..ddcd6e14c 100644
--- a/test/std/containers/unord/unord.map/incomplete_type.pass.cpp
+++ b/test/std/containers/unord/unord.map/incomplete_type.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,6 +31,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/iterators.pass.cpp b/test/std/containers/unord/unord.map/iterators.pass.cpp
index f99adb52b..0b4e02e33 100644
--- a/test/std/containers/unord/unord.map/iterators.pass.cpp
+++ b/test/std/containers/unord/unord.map/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -127,4 +126,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/load_factor.pass.cpp b/test/std/containers/unord/unord.map/load_factor.pass.cpp
index 2d6162f28..7a5fde8a4 100644
--- a/test/std/containers/unord/unord.map/load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.map/load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -74,4 +73,6 @@ int main()
         assert(c.load_factor() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/local_iterators.pass.cpp b/test/std/containers/unord/unord.map/local_iterators.pass.cpp
index 33a428a4f..e24e1811a 100644
--- a/test/std/containers/unord/unord.map/local_iterators.pass.cpp
+++ b/test/std/containers/unord/unord.map/local_iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -418,4 +417,6 @@ int main()
         assert(i->second == "four");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/max_bucket_count.pass.cpp b/test/std/containers/unord/unord.map/max_bucket_count.pass.cpp
index 08f014da2..eb8f3e9d2 100644
--- a/test/std/containers/unord/unord.map/max_bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.map/max_bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -37,4 +36,6 @@ int main()
         assert(c.max_bucket_count() > 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/max_load_factor.pass.cpp b/test/std/containers/unord/unord.map/max_load_factor.pass.cpp
index d9e1d057a..8620dd1bd 100644
--- a/test/std/containers/unord/unord.map/max_load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.map/max_load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -66,4 +65,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/max_size.pass.cpp b/test/std/containers/unord/unord.map/max_size.pass.cpp
index d01b52683..7c2ec58de 100644
--- a/test/std/containers/unord/unord.map/max_size.pass.cpp
+++ b/test/std/containers/unord/unord.map/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
   typedef std::pair<const int, int> KV;
   {
@@ -50,4 +49,6 @@ int main()
       assert(c.max_size() <= max_dist);
       assert(c.max_size() <= alloc_max_size(c.get_allocator()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/rehash.pass.cpp b/test/std/containers/unord/unord.map/rehash.pass.cpp
index 41015726e..c8f079fb6 100644
--- a/test/std/containers/unord/unord.map/rehash.pass.cpp
+++ b/test/std/containers/unord/unord.map/rehash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ void test(const C& c)
     assert(c.at(4) == "four");
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -101,4 +100,6 @@ int main()
         test(c);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/reserve.pass.cpp b/test/std/containers/unord/unord.map/reserve.pass.cpp
index 1836c2a41..622a9691e 100644
--- a/test/std/containers/unord/unord.map/reserve.pass.cpp
+++ b/test/std/containers/unord/unord.map/reserve.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void reserve_invariant(size_t n) // LWG #2156
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -105,4 +104,6 @@ int main()
     }
 #endif
     reserve_invariant(20);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/size.pass.cpp b/test/std/containers/unord/unord.map/size.pass.cpp
index 5bf75648f..d4e7cb97f 100644
--- a/test/std/containers/unord/unord.map/size.pass.cpp
+++ b/test/std/containers/unord/unord.map/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_map<int, double> M;
@@ -59,4 +58,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/swap_member.pass.cpp b/test/std/containers/unord/unord.map/swap_member.pass.cpp
index 86a068cd3..ff9b32e3e 100644
--- a/test/std/containers/unord/unord.map/swap_member.pass.cpp
+++ b/test/std/containers/unord/unord.map/swap_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -568,4 +567,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/types.pass.cpp b/test/std/containers/unord/unord.map/types.pass.cpp
index ecdc53c54..e194f69f8 100644
--- a/test/std/containers/unord/unord.map/types.pass.cpp
+++ b/test/std/containers/unord/unord.map/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<char, short> C;
@@ -69,4 +68,6 @@ int main()
         static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/allocator.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/allocator.pass.cpp
index 6caa59728..8f1d7561b 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/allocator.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<NotConstructible, NotConstructible,
@@ -127,4 +126,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/assign_copy.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/assign_copy.pass.cpp
index c6b92744e..a5a67bcc2 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/assign_copy.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<std::pair<const int, std::string> > A;
@@ -186,4 +185,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/assign_init.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/assign_init.pass.cpp
index 6bfb7bc18..e9e628988 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/assign_init.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/assign_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "../../../test_hash.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::allocator<std::pair<const int, std::string> > A;
@@ -94,4 +93,6 @@ int main()
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/assign_move.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/assign_move.pass.cpp
index af98b923d..87b80cef1 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/assign_move.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<std::pair<const int, std::string> > A;
@@ -215,4 +214,6 @@ int main()
         assert(c.max_load_factor() == 1);
         assert(c0.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/compare_copy_constructible.fail.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/compare_copy_constructible.fail.cpp
index 8f6f16c62..2591c99f4 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_map<int, int, std::hash<int>, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/copy.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/copy.pass.cpp
index 0b1d460ef..ee4bc43a5 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/copy.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -149,4 +148,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/copy_alloc.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/copy_alloc.pass.cpp
index cf83074ae..8e7a3a079 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/copy_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -149,4 +148,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/default.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/default.pass.cpp
index 04d172e4d..bda7d24a6 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/default.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<NotConstructible, NotConstructible,
@@ -109,4 +108,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/default_noexcept.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/default_noexcept.pass.cpp
index 7ef7f47ff..a4af74a89 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/default_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -73,4 +72,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/dtor_noexcept.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/dtor_noexcept.pass.cpp
index 0fe98abe7..4f4331fa0 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/dtor_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<MoveOnly, MoveOnly> C;
@@ -66,4 +65,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/hash_copy_constructible.fail.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/hash_copy_constructible.fail.cpp
index aca2a5aa3..026e319fc 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/hash_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/hash_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@ private:
 };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_map<int, int, Hash<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/init.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/init.pass.cpp
index 1979dd326..00b4a2f0b 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/init.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -160,4 +159,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif // TEST_STD_VER > 11
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size.pass.cpp
index ca48808f4..f1dbad9fe 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -98,4 +97,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash.pass.cpp
index 02360f8ac..c0c3d5c5b 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -100,4 +99,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal.pass.cpp
index c6a397656..5c87af0a1 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -103,4 +102,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal_allocator.pass.cpp
index 5acc4c34b..5ab0366da 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -141,4 +140,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/move.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/move.pass.cpp
index 808d8946a..d4eed3c03 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/move.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -177,4 +176,6 @@ int main()
         assert(s2.size() == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/move_alloc.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/move_alloc.pass.cpp
index 296363166..be72227da 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/move_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, std::string> P;
@@ -196,4 +195,6 @@ int main()
 
         assert(c0.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/move_assign_noexcept.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/move_assign_noexcept.pass.cpp
index 4191102a8..78ac7d787 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<MoveOnly, MoveOnly> C;
@@ -72,4 +71,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/move_noexcept.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/move_noexcept.pass.cpp
index 2eb8c9467..62175145d 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/move_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -69,4 +68,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/range.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/range.pass.cpp
index 94c4bca9b..a6d871508 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/range.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -170,4 +169,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size.pass.cpp
index 426b5dac1..66e0ac3a7 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -105,4 +104,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash.pass.cpp
index ea058bdff..62a590736 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -108,4 +107,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal.pass.cpp
index 1fdde2b12..70e391d46 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -110,4 +109,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal_allocator.pass.cpp
index f95efbe5f..1f29c5414 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string,
@@ -151,4 +150,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/size.fail.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/size.fail.cpp
index 94833c232..9a715b6a1 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/size.fail.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/size.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<NotConstructible, NotConstructible,
@@ -67,4 +66,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/size.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/size.pass.cpp
index acf6b11fe..41cfc7104 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/size.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<NotConstructible, NotConstructible,
@@ -67,4 +66,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash.pass.cpp
index 42a248cc1..f97ee39fb 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<NotConstructible, NotConstructible,
@@ -71,4 +70,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal.pass.cpp
index 820a3652e..8c306364e 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<NotConstructible, NotConstructible,
@@ -73,4 +72,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal_allocator.pass.cpp
index 58c397c2b..40b9d01a2 100644
--- a/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.cnstr/size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<NotConstructible, NotConstructible,
@@ -97,4 +96,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.elem/at.pass.cpp b/test/std/containers/unord/unord.map/unord.map.elem/at.pass.cpp
index a17c49d59..fe6ef8bc7 100644
--- a/test/std/containers/unord/unord.map/unord.map.elem/at.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.elem/at.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "min_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -141,4 +140,6 @@ int main()
 #endif
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.elem/index.pass.cpp b/test/std/containers/unord/unord.map/unord.map.elem/index.pass.cpp
index f7f3a22d5..ff83f1d68 100644
--- a/test/std/containers/unord/unord.map/unord.map.elem/index.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.elem/index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "container_test_types.h"
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -160,4 +159,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.elem/index_tuple.pass.cpp b/test/std/containers/unord/unord.map/unord.map.elem/index_tuple.pass.cpp
index 400e0283f..4719b5583 100644
--- a/test/std/containers/unord/unord.map/unord.map.elem/index_tuple.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.elem/index_tuple.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,8 +28,10 @@ struct my_hash
     size_t operator()(const tuple<int,int>&) const {return 0;}
 };
 
-int main()
+int main(int, char**)
 {
     unordered_map<tuple<int,int>, size_t, my_hash> m;
     m[make_tuple(2,3)]=7;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/clear.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/clear.pass.cpp
index 9212a5e3d..64fe72ecd 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/clear.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -61,4 +60,6 @@ int main()
         assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/emplace.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/emplace.pass.cpp
index 18c83dd31..63a269601 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/emplace.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "../../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, Emplaceable> C;
@@ -75,4 +74,6 @@ int main()
         assert(r.first->first == 5);
         assert(r.first->second == Emplaceable(6, 7));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/emplace_hint.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/emplace_hint.pass.cpp
index ce7fa835c..01e8d9c6f 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/emplace_hint.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "../../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, Emplaceable> C;
@@ -72,4 +71,6 @@ int main()
         assert(r->first == 5);
         assert(r->second == Emplaceable(6, 7));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
index 803ecb5ad..1d0b18bf1 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct TemplateConstructor
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -90,4 +89,6 @@ int main()
             m.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db1.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db1.pass.cpp
index 60b093553..38ba03d5e 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <unordered_map>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -32,8 +31,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db2.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db2.pass.cpp
index 05046f5de..887f7859b 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cstdlib>
 #include <exception>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -35,8 +34,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db1.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db1.pass.cpp
index 81a8d3de1..15c6745ad 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db2.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db2.pass.cpp
index 4b103a0ad..0ae0674ad 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db3.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db3.pass.cpp
index 6ef1e07ad..134d075ec 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db3.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db4.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db4.pass.cpp
index 1185ddf8f..17745175b 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db4.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_iter_iter_db4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_key.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_key.pass.cpp
index cdd19eb34..305d149a5 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_key.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ bool only_deletions ( const Unordered &whole, const Unordered &part ) {
 #endif
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -175,4 +174,6 @@ int main()
     assert (only_deletions (m, m2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_range.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_range.pass.cpp
index 820b12a9b..839d65733 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_range.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -96,4 +95,6 @@ int main()
         assert(k == c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp
index 4cc13ded2..3ad30510f 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using map_type = std::unordered_map<int, int>;
@@ -64,4 +63,6 @@ int main()
         min_alloc_map m = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}, {6, 6}};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp
index 25aa24888..4d6c24e6e 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_map<int, int> m = {{1,1}, {2,2}, {3,3}, {4,4}, {5,5}, {6,6}};
@@ -73,4 +72,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp
index 00c47182c..71d456e66 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_and_emplace_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 #include "container_test_types.h"
 #include "../../../map_allocator_requirement_test_templates.h"
 
-int main()
+int main(int, char**)
 {
   testMapInsert<TCT::unordered_map<> >();
   testMapInsertHint<TCT::unordered_map<> >();
   testMapEmplace<TCT::unordered_map<> >();
   testMapEmplaceHint<TCT::unordered_map<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_const_lvalue.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_const_lvalue.pass.cpp
index a191ad703..eb505218f 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ void do_insert_cv_test()
     assert(r.first->second == 3);
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<double, int> M;
@@ -79,4 +78,6 @@ int main()
         do_insert_cv_test<M>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_const_lvalue.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_const_lvalue.pass.cpp
index 5c653ee8f..b1b77eb9c 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ void do_insert_hint_const_lvalue_test()
     assert(r->second == 4);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_hint_const_lvalue_test<std::unordered_map<double, int> >();
 #if TEST_STD_VER >= 11
@@ -81,4 +80,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_rvalue.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_rvalue.pass.cpp
index 471040a33..b7374d1a6 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_hint_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<double, int> C;
@@ -174,4 +173,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_init.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_init.pass.cpp
index 477a229d0..27e874734 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_init.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -67,4 +66,6 @@ int main()
         assert(c.at(3) == "three");
         assert(c.at(4) == "four");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type.pass.cpp
index d43486488..24d0a23a5 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,10 +74,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_map<int, int> m;
     test(m);
     std::unordered_map<int, int, std::hash<int>, std::equal_to<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp
index ef98453b6..21ccb88ca 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,10 +54,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_map<int, int> m;
     test(m);
     std::unordered_map<int, int, std::hash<int>, std::equal_to<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp
index e84301e9e..7fc3ff187 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_or_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -62,7 +61,7 @@ namespace std {
     };
 }
 
-int main()
+int main(int, char**)
 {
 
     { // pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj);
@@ -189,4 +188,6 @@ int main()
         assert(r->second.get() == 5);  // value
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_range.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_range.pass.cpp
index b722b4a5b..1d51bdb4f 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_range.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<int, std::string> C;
@@ -68,4 +67,6 @@ int main()
         assert(c.at(4) == "four");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_rvalue.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_rvalue.pass.cpp
index 8c8551e74..1f8528ab5 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/insert_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/insert_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_map<double, int> C;
@@ -173,4 +172,6 @@ int main()
         assert(r.first->first == 5.5);
         assert(r.first->second == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp
index 2d5e1843f..1437d46d2 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_hasher
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_map<int, int> src{{1, 0}, {3, 0}, {5, 0}};
@@ -154,4 +153,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp
index adc4d6944..c3ee0050a 100644
--- a/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/try.emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -61,7 +60,7 @@ namespace std {
     };
 }
 
-int main()
+int main(int, char**)
 {
 
     { // pair<iterator, bool> try_emplace(const key_type& k, Args&&... args);
@@ -186,4 +185,6 @@ int main()
         assert(r->first.get()  == 3); // key
         assert(r->second.get() == 4); // value
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.swap/db_swap_1.pass.cpp b/test/std/containers/unord/unord.map/unord.map.swap/db_swap_1.pass.cpp
index 6ab9c923d..67a49d4bb 100644
--- a/test/std/containers/unord/unord.map/unord.map.swap/db_swap_1.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.swap/db_swap_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <unordered_map>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if _LIBCPP_DEBUG >= 1
     {
@@ -41,4 +40,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.swap/swap_noexcept.pass.cpp b/test/std/containers/unord/unord.map/unord.map.swap/swap_noexcept.pass.cpp
index 9497b1523..44ee7be49 100644
--- a/test/std/containers/unord/unord.map/unord.map.swap/swap_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.swap/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -120,7 +119,7 @@ struct some_alloc3
 };
 
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> MapType;
     {
@@ -189,4 +188,6 @@ int main()
     }
 #endif // _LIBCPP_VERSION
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.map/unord.map.swap/swap_non_member.pass.cpp b/test/std/containers/unord/unord.map/unord.map.swap/swap_non_member.pass.cpp
index 2044f42cf..7852394cd 100644
--- a/test/std/containers/unord/unord.map/unord.map.swap/swap_non_member.pass.cpp
+++ b/test/std/containers/unord/unord.map/unord.map.swap/swap_non_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -568,4 +567,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/allocator_mismatch.fail.cpp b/test/std/containers/unord/unord.multimap/allocator_mismatch.fail.cpp
index 3c740950d..ba24ca3cc 100644
--- a/test/std/containers/unord/unord.multimap/allocator_mismatch.fail.cpp
+++ b/test/std/containers/unord/unord.multimap/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <unordered_map>
 
-int main()
+int main(int, char**)
 {
     std::unordered_multimap<int, int, std::hash<int>, std::less<int>, std::allocator<long> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/bucket.pass.cpp b/test/std/containers/unord/unord.multimap/bucket.pass.cpp
index 425c63f9d..c6c8b217c 100644
--- a/test/std/containers/unord/unord.multimap/bucket.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/bucket.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -75,4 +74,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/bucket_count.pass.cpp b/test/std/containers/unord/unord.multimap/bucket_count.pass.cpp
index 5cb60f6a6..9c0735719 100644
--- a/test/std/containers/unord/unord.multimap/bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -45,4 +44,6 @@ int main()
         const C c(std::begin(a), std::end(a));
         assert(c.bucket_count() >= 8);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/bucket_size.pass.cpp b/test/std/containers/unord/unord.multimap/bucket_size.pass.cpp
index 30c0e5e3c..f49197521 100644
--- a/test/std/containers/unord/unord.multimap/bucket_size.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/bucket_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -83,4 +82,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/count.pass.cpp b/test/std/containers/unord/unord.multimap/count.pass.cpp
index c93a2237c..4a6ec5d65 100644
--- a/test/std/containers/unord/unord.multimap/count.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -68,4 +67,6 @@ int main()
         assert(c.count(5) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/db_iterators_7.pass.cpp b/test/std/containers/unord/unord.multimap/db_iterators_7.pass.cpp
index 8a23edd17..463b49938 100644
--- a/test/std/containers/unord/unord.multimap/db_iterators_7.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/db_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multimap<int, std::string> C;
@@ -53,8 +52,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/db_iterators_8.pass.cpp b/test/std/containers/unord/unord.multimap/db_iterators_8.pass.cpp
index e5a9ce961..38395e5f9 100644
--- a/test/std/containers/unord/unord.multimap/db_iterators_8.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/db_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multimap<int, std::string> C;
@@ -49,8 +48,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/db_local_iterators_7.pass.cpp b/test/std/containers/unord/unord.multimap/db_local_iterators_7.pass.cpp
index 2bd161f75..04d8b3ff0 100644
--- a/test/std/containers/unord/unord.multimap/db_local_iterators_7.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/db_local_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multimap<int, std::string> C;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/db_local_iterators_8.pass.cpp b/test/std/containers/unord/unord.multimap/db_local_iterators_8.pass.cpp
index 78b40e14e..69ef06993 100644
--- a/test/std/containers/unord/unord.multimap/db_local_iterators_8.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/db_local_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multimap<int, std::string> C;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/empty.fail.cpp b/test/std/containers/unord/unord.multimap/empty.fail.cpp
index 7e3a6f4b9..4eb7bfc9c 100644
--- a/test/std/containers/unord/unord.multimap/empty.fail.cpp
+++ b/test/std/containers/unord/unord.multimap/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::unordered_multimap<int, int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/empty.pass.cpp b/test/std/containers/unord/unord.multimap/empty.pass.cpp
index 68405f229..6189b7f0e 100644
--- a/test/std/containers/unord/unord.multimap/empty.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multimap<int, double> M;
@@ -43,4 +42,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/eq.pass.cpp b/test/std/containers/unord/unord.multimap/eq.pass.cpp
index f95bea3da..575191687 100644
--- a/test/std/containers/unord/unord.multimap/eq.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -178,4 +177,6 @@ int main()
         assert(!(c1 != c2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/equal_range_const.pass.cpp b/test/std/containers/unord/unord.multimap/equal_range_const.pass.cpp
index 382ed7c98..148081be7 100644
--- a/test/std/containers/unord/unord.multimap/equal_range_const.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/equal_range_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,12 @@
 
 #include <unordered_map>
 #include <string>
+#include <set>
 #include <cassert>
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -48,14 +48,17 @@ int main()
         r = c.equal_range(5);
         assert(std::distance(r.first, r.second) == 0);
         r = c.equal_range(50);
-        assert(r.first->first == 50);
-        assert(r.first->second == "fifty");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyA");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyB");
+        std::set<std::string> s;
+        s.insert("fifty");
+        s.insert("fiftyA");
+        s.insert("fiftyB");
+        for ( int i = 0; i < 3; ++i )
+        {
+            assert(r.first->first == 50);
+            assert(s.find(r.first->second) != s.end());
+            s.erase(s.find(r.first->second));
+            ++r.first;
+        }
     }
 #if TEST_STD_VER >= 11
     {
@@ -84,14 +87,19 @@ int main()
         r = c.equal_range(5);
         assert(std::distance(r.first, r.second) == 0);
         r = c.equal_range(50);
-        assert(r.first->first == 50);
-        assert(r.first->second == "fifty");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyA");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyB");
+        std::set<std::string> s;
+        s.insert("fifty");
+        s.insert("fiftyA");
+        s.insert("fiftyB");
+        for ( int i = 0; i < 3; ++i )
+        {
+            assert(r.first->first == 50);
+            assert(s.find(r.first->second) != s.end());
+            s.erase(s.find(r.first->second));
+            ++r.first;
+        }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/equal_range_non_const.pass.cpp b/test/std/containers/unord/unord.multimap/equal_range_non_const.pass.cpp
index 17eb14e44..5da87166b 100644
--- a/test/std/containers/unord/unord.multimap/equal_range_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/equal_range_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,12 @@
 
 #include <unordered_map>
 #include <string>
+#include <set>
 #include <cassert>
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -48,14 +48,17 @@ int main()
         r = c.equal_range(5);
         assert(std::distance(r.first, r.second) == 0);
         r = c.equal_range(50);
-        assert(r.first->first == 50);
-        assert(r.first->second == "fifty");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyA");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyB");
+        std::set<std::string> s;
+        s.insert("fifty");
+        s.insert("fiftyA");
+        s.insert("fiftyB");
+        for ( int i = 0; i < 3; ++i )
+        {
+            assert(r.first->first == 50);
+            assert(s.find(r.first->second) != s.end());
+            s.erase(s.find(r.first->second));
+            ++r.first;
+        }
     }
 #if TEST_STD_VER >= 11
     {
@@ -84,14 +87,19 @@ int main()
         r = c.equal_range(5);
         assert(std::distance(r.first, r.second) == 0);
         r = c.equal_range(50);
-        assert(r.first->first == 50);
-        assert(r.first->second == "fifty");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyA");
-        ++r.first;
-        assert(r.first->first == 50);
-        assert(r.first->second == "fiftyB");
+        std::set<std::string> s;
+        s.insert("fifty");
+        s.insert("fiftyA");
+        s.insert("fiftyB");
+        for ( int i = 0; i < 3; ++i )
+        {
+            assert(r.first->first == 50);
+            assert(s.find(r.first->second) != s.end());
+            s.erase(s.find(r.first->second));
+            ++r.first;
+        }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/erase_if.pass.cpp b/test/std/containers/unord/unord.multimap/erase_if.pass.cpp
index dc613269a..2cec09205 100644
--- a/test/std/containers/unord/unord.multimap/erase_if.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -79,7 +78,7 @@ void test()
     test0<S>({1,2,3}, False, {1,2,3});
 }
 
-int main()
+int main(int, char**)
 {
     test<std::unordered_multimap<int, int>>();
     test<std::unordered_multimap<int, int, std::hash<int>, std::equal_to<int>, min_allocator<std::pair<const int, int>>>> ();
@@ -87,4 +86,6 @@ int main()
 
     test<std::unordered_multimap<long, short>>();
     test<std::unordered_multimap<short, double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/find_const.pass.cpp b/test/std/containers/unord/unord.multimap/find_const.pass.cpp
index 70c2b45ef..271bf9d0c 100644
--- a/test/std/containers/unord/unord.multimap/find_const.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/find_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -68,4 +67,6 @@ int main()
         assert(i == c.cend());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/find_non_const.pass.cpp b/test/std/containers/unord/unord.multimap/find_non_const.pass.cpp
index 0510d1441..3e642e346 100644
--- a/test/std/containers/unord/unord.multimap/find_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/find_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -68,4 +67,6 @@ int main()
         assert(i == c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/incomplete.pass.cpp b/test/std/containers/unord/unord.multimap/incomplete.pass.cpp
index 67bff9419..6ea493129 100644
--- a/test/std/containers/unord/unord.multimap/incomplete.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/incomplete.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,6 +31,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/iterators.fail.cpp b/test/std/containers/unord/unord.multimap/iterators.fail.cpp
index 5ecaba4e5..0c1b50fac 100644
--- a/test/std/containers/unord/unord.multimap/iterators.fail.cpp
+++ b/test/std/containers/unord/unord.multimap/iterators.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -68,4 +67,6 @@ int main()
         assert(std::distance(c.begin(), c.end()) == c.size());
         assert(std::distance(c.cbegin(), c.cend()) == c.size());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/iterators.pass.cpp b/test/std/containers/unord/unord.multimap/iterators.pass.cpp
index 22aa3a0c0..5fd52beeb 100644
--- a/test/std/containers/unord/unord.multimap/iterators.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -133,4 +132,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/load_factor.pass.cpp b/test/std/containers/unord/unord.multimap/load_factor.pass.cpp
index ff3bc0105..ae8a8403b 100644
--- a/test/std/containers/unord/unord.multimap/load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -73,4 +72,6 @@ int main()
         assert(c.load_factor() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/local_iterators.fail.cpp b/test/std/containers/unord/unord.multimap/local_iterators.fail.cpp
index 064e1b1bd..f5af79180 100644
--- a/test/std/containers/unord/unord.multimap/local_iterators.fail.cpp
+++ b/test/std/containers/unord/unord.multimap/local_iterators.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -285,4 +284,6 @@ int main()
         j = c.cend(b);
         assert(std::distance(i, j) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/local_iterators.pass.cpp b/test/std/containers/unord/unord.multimap/local_iterators.pass.cpp
index 504fe54de..b5dd2d4b0 100644
--- a/test/std/containers/unord/unord.multimap/local_iterators.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/local_iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,11 +21,12 @@
 
 #include <unordered_map>
 #include <string>
+#include <set>
 #include <cassert>
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -52,21 +52,35 @@ int main()
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.begin(b);
@@ -116,21 +130,35 @@ int main()
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.begin(b);
@@ -180,21 +208,35 @@ int main()
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.cbegin(b);
@@ -244,21 +286,35 @@ int main()
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.cbegin(b);
@@ -310,21 +366,35 @@ int main()
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.begin(b);
@@ -375,21 +445,35 @@ int main()
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.begin(b);
         j = c.end(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.begin(b);
@@ -440,21 +524,35 @@ int main()
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.cbegin(b);
@@ -505,21 +603,35 @@ int main()
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 1);
-        assert(i->second == "one");
-        ++i;
-        assert(i->first == 1);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 1);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(2);
         i = c.cbegin(b);
         j = c.cend(b);
         assert(std::distance(i, j) == 2);
-        assert(i->first == 2);
-        assert(i->second == "two");
-        ++i;
-        assert(i->first == 2);
-        assert(i->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            for ( int n = 0; n < 2; ++n )
+            {
+                assert(i->first == 2);
+                assert(s.find(i->second) != s.end());
+                s.erase(s.find(i->second));
+                ++i;
+            }
+        }
 
         b = c.bucket(3);
         i = c.cbegin(b);
@@ -546,4 +658,6 @@ int main()
         assert(std::distance(i, j) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/max_bucket_count.pass.cpp b/test/std/containers/unord/unord.multimap/max_bucket_count.pass.cpp
index 3e9a10ab7..c55f4de8d 100644
--- a/test/std/containers/unord/unord.multimap/max_bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/max_bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -36,4 +35,6 @@ int main()
         assert(c.max_bucket_count() > 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/max_load_factor.pass.cpp b/test/std/containers/unord/unord.multimap/max_load_factor.pass.cpp
index 38c8285f5..ed46b681b 100644
--- a/test/std/containers/unord/unord.multimap/max_load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/max_load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -64,4 +63,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/max_size.pass.cpp b/test/std/containers/unord/unord.multimap/max_size.pass.cpp
index 228575c2e..d03cf67ae 100644
--- a/test/std/containers/unord/unord.multimap/max_size.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
   typedef std::pair<const int, int> KV;
   {
@@ -52,4 +51,6 @@ int main()
       assert(c.max_size() <= max_dist);
       assert(c.max_size() <= alloc_max_size(c.get_allocator()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/rehash.pass.cpp b/test/std/containers/unord/unord.multimap/rehash.pass.cpp
index 22202ccb6..99538e32d 100644
--- a/test/std/containers/unord/unord.multimap/rehash.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/rehash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,7 @@
 
 #include <unordered_map>
 #include <string>
+#include <set>
 #include <cassert>
 #include <cfloat>
 #include <cmath>
@@ -39,20 +39,33 @@ void test(const C& c)
     Eq eq = c.equal_range(1);
     assert(std::distance(eq.first, eq.second) == 2);
     typename C::const_iterator i = eq.first;
-    assert(i->first == 1);
-    assert(i->second == "one");
-    ++i;
-    assert(i->first == 1);
-    assert(i->second == "four");
+    {
+        std::set<std::string> s;
+        s.insert("one");
+        s.insert("four");
+        for ( int n = 0; n < 2; ++n )
+        {
+            assert(i->first == 1);
+            assert(s.find(i->second) != s.end());
+            s.erase(s.find(i->second));
+            ++i;
+        }
+    }
     eq = c.equal_range(2);
     assert(std::distance(eq.first, eq.second) == 2);
     i = eq.first;
-    assert(i->first == 2);
-    assert(i->second == "two");
-    ++i;
-    assert(i->first == 2);
-    assert(i->second == "four");
-
+    {
+        std::set<std::string> s;
+        s.insert("two");
+        s.insert("four");
+        for ( int n = 0; n < 2; ++n )
+        {
+            assert(i->first == 2);
+            assert(s.find(i->second) != s.end());
+            s.erase(s.find(i->second));
+            ++i;
+        }
+    }
     eq = c.equal_range(3);
     assert(std::distance(eq.first, eq.second) == 1);
     i = eq.first;
@@ -68,7 +81,7 @@ void test(const C& c)
     assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -131,4 +144,6 @@ int main()
         test(c);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/reserve.pass.cpp b/test/std/containers/unord/unord.multimap/reserve.pass.cpp
index d86c69c88..811ac97fb 100644
--- a/test/std/containers/unord/unord.multimap/reserve.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/reserve.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,10 +12,11 @@
 //           class Alloc = allocator<pair<const Key, T>>>
 // class unordered_multimap
 
-// void rehash(size_type n);
+// void reserve(size_type n);
 
 #include <unordered_map>
 #include <string>
+#include <set>
 #include <cassert>
 
 #include "test_macros.h"
@@ -26,10 +26,22 @@ template <class C>
 void test(const C& c)
 {
     assert(c.size() == 6);
-    assert(c.find(1)->second == "one");
-    assert(next(c.find(1))->second == "four");
-    assert(c.find(2)->second == "two");
-    assert(next(c.find(2))->second == "four");
+    {
+        std::set<std::string> s;
+        s.insert("one");
+        s.insert("four");
+        assert(s.find(c.find(1)->second) != s.end());
+        s.erase(s.find(c.find(1)->second));
+        assert(s.find(next(c.find(1))->second) != s.end());
+    }
+    {
+        std::set<std::string> s;
+        s.insert("two");
+        s.insert("four");
+        assert(s.find(c.find(2)->second) != s.end());
+        s.erase(s.find(c.find(2)->second));
+        assert(s.find(next(c.find(2))->second) != s.end());
+    }
     assert(c.find(3)->second == "three");
     assert(c.find(4)->second == "four");
 }
@@ -49,7 +61,7 @@ void reserve_invariant(size_t n) // LWG #2156
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -107,4 +119,6 @@ int main()
     }
 #endif
     reserve_invariant(20);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/scary.pass.cpp b/test/std/containers/unord/unord.multimap/scary.pass.cpp
index ad32ff713..4c4b1cd11 100644
--- a/test/std/containers/unord/unord.multimap/scary.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/scary.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 
 #include <unordered_map>
 
-int main()
+int main(int, char**)
 {
     typedef std::unordered_map<int, int> M1;
     typedef std::unordered_multimap<int, int> M2;
     M2::iterator i;
     M1::iterator j = i;
     ((void)j);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/size.pass.cpp b/test/std/containers/unord/unord.multimap/size.pass.cpp
index b12966240..493b8d757 100644
--- a/test/std/containers/unord/unord.multimap/size.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multimap<int, double> M;
@@ -59,4 +58,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/swap_member.pass.cpp b/test/std/containers/unord/unord.multimap/swap_member.pass.cpp
index 8c5ddab05..75806df97 100644
--- a/test/std/containers/unord/unord.multimap/swap_member.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/swap_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,7 @@
 
 #include <unordered_map>
 #include <string>
+#include <set>
 #include <cassert>
 #include <cstddef>
 
@@ -27,7 +27,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -136,10 +136,22 @@ int main()
 
         assert(c2.bucket_count() >= 6);
         assert(c2.size() == 6);
-        assert(c2.find(1)->second == "one");
-        assert(next(c2.find(1))->second == "four");
-        assert(c2.find(2)->second == "two");
-        assert(next(c2.find(2))->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            assert(s.find(c2.find(1)->second) != s.end());
+            s.erase(s.find(c2.find(1)->second));
+            assert(s.find(next(c2.find(1))->second) != s.end());
+        }
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            assert(s.find(c2.find(2)->second) != s.end());
+            s.erase(s.find(c2.find(2)->second));
+            assert(s.find(next(c2.find(2))->second) != s.end());
+        }
         assert(c2.find(3)->second == "three");
         assert(c2.find(4)->second == "four");
         assert(c2.hash_function() == Hash(1));
@@ -199,10 +211,22 @@ int main()
 
         assert(c2.bucket_count() >= 6);
         assert(c2.size() == 6);
-        assert(c2.find(1)->second == "one");
-        assert(next(c2.find(1))->second == "four");
-        assert(c2.find(2)->second == "two");
-        assert(next(c2.find(2))->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            assert(s.find(c2.find(1)->second) != s.end());
+            s.erase(s.find(c2.find(1)->second));
+            assert(s.find(next(c2.find(1))->second) != s.end());
+        }
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            assert(s.find(c2.find(2)->second) != s.end());
+            s.erase(s.find(c2.find(2)->second));
+            assert(s.find(next(c2.find(2))->second) != s.end());
+        }
         assert(c2.find(3)->second == "three");
         assert(c2.find(4)->second == "four");
         assert(c2.hash_function() == Hash(1));
@@ -320,10 +344,22 @@ int main()
 
         assert(c2.bucket_count() >= 6);
         assert(c2.size() == 6);
-        assert(c2.find(1)->second == "one");
-        assert(next(c2.find(1))->second == "four");
-        assert(c2.find(2)->second == "two");
-        assert(next(c2.find(2))->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            assert(s.find(c2.find(1)->second) != s.end());
+            s.erase(s.find(c2.find(1)->second));
+            assert(s.find(next(c2.find(1))->second) != s.end());
+        }
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            assert(s.find(c2.find(2)->second) != s.end());
+            s.erase(s.find(c2.find(2)->second));
+            assert(s.find(next(c2.find(2))->second) != s.end());
+        }
         assert(c2.find(3)->second == "three");
         assert(c2.find(4)->second == "four");
         assert(c2.hash_function() == Hash(1));
@@ -383,10 +419,22 @@ int main()
 
         assert(c2.bucket_count() >= 6);
         assert(c2.size() == 6);
-        assert(c2.find(1)->second == "one");
-        assert(next(c2.find(1))->second == "four");
-        assert(c2.find(2)->second == "two");
-        assert(next(c2.find(2))->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            assert(s.find(c2.find(1)->second) != s.end());
+            s.erase(s.find(c2.find(1)->second));
+            assert(s.find(next(c2.find(1))->second) != s.end());
+        }
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            assert(s.find(c2.find(2)->second) != s.end());
+            s.erase(s.find(c2.find(2)->second));
+            assert(s.find(next(c2.find(2))->second) != s.end());
+        }
         assert(c2.find(3)->second == "three");
         assert(c2.find(4)->second == "four");
         assert(c2.hash_function() == Hash(1));
@@ -504,10 +552,22 @@ int main()
 
         assert(c2.bucket_count() >= 6);
         assert(c2.size() == 6);
-        assert(c2.find(1)->second == "one");
-        assert(next(c2.find(1))->second == "four");
-        assert(c2.find(2)->second == "two");
-        assert(next(c2.find(2))->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            assert(s.find(c2.find(1)->second) != s.end());
+            s.erase(s.find(c2.find(1)->second));
+            assert(s.find(next(c2.find(1))->second) != s.end());
+        }
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            assert(s.find(c2.find(2)->second) != s.end());
+            s.erase(s.find(c2.find(2)->second));
+            assert(s.find(next(c2.find(2))->second) != s.end());
+        }
         assert(c2.find(3)->second == "three");
         assert(c2.find(4)->second == "four");
         assert(c2.hash_function() == Hash(1));
@@ -567,10 +627,22 @@ int main()
 
         assert(c2.bucket_count() >= 6);
         assert(c2.size() == 6);
-        assert(c2.find(1)->second == "one");
-        assert(next(c2.find(1))->second == "four");
-        assert(c2.find(2)->second == "two");
-        assert(next(c2.find(2))->second == "four");
+        {
+            std::set<std::string> s;
+            s.insert("one");
+            s.insert("four");
+            assert(s.find(c2.find(1)->second) != s.end());
+            s.erase(s.find(c2.find(1)->second));
+            assert(s.find(next(c2.find(1))->second) != s.end());
+        }
+        {
+            std::set<std::string> s;
+            s.insert("two");
+            s.insert("four");
+            assert(s.find(c2.find(2)->second) != s.end());
+            s.erase(s.find(c2.find(2)->second));
+            assert(s.find(next(c2.find(2))->second) != s.end());
+        }
         assert(c2.find(3)->second == "three");
         assert(c2.find(4)->second == "four");
         assert(c2.hash_function() == Hash(1));
@@ -581,4 +653,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/types.pass.cpp b/test/std/containers/unord/unord.multimap/types.pass.cpp
index e14123490..2cb74a154 100644
--- a/test/std/containers/unord/unord.multimap/types.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<char, short> C;
@@ -69,4 +68,6 @@ int main()
         static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/allocator.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/allocator.pass.cpp
index 19877738a..e15999f18 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<NotConstructible, NotConstructible,
@@ -127,4 +126,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_copy.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_copy.pass.cpp
index d5729e350..191dec98e 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_copy.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<std::pair<const int, std::string> > A;
@@ -228,4 +227,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_init.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_init.pass.cpp
index f06ed700f..5947905a6 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_init.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<std::pair<const int, std::string> > A;
@@ -143,4 +142,6 @@ int main()
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_move.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_move.pass.cpp
index 11a1759bb..21c791a81 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_move.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<std::pair<const int, std::string> > A;
@@ -292,4 +291,6 @@ int main()
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/compare_copy_constructible.fail.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/compare_copy_constructible.fail.cpp
index cb0ce522d..fe288035f 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_multimap<int, int, std::hash<int>, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy.pass.cpp
index 5e314db06..d57016222 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -191,4 +190,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy_alloc.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy_alloc.pass.cpp
index cb221abd4..ebd047184 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -191,4 +190,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default.pass.cpp
index 8418c885e..dea7a4604 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<NotConstructible, NotConstructible,
@@ -109,4 +108,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default_noexcept.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default_noexcept.pass.cpp
index d924ef15c..5a54f61b5 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -72,4 +71,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/dtor_noexcept.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/dtor_noexcept.pass.cpp
index 2fbe7a674..8f677edcb 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/dtor_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<MoveOnly, MoveOnly> C;
@@ -65,4 +64,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/hash_copy_constructible.fail.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/hash_copy_constructible.fail.cpp
index f5f42e5d2..2681710c9 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/hash_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/hash_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_multimap<int, int, Hash<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init.pass.cpp
index b3519fd50..aba32bfeb 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -252,4 +251,6 @@ int main()
         assert(!(c.get_allocator() == A()));
     }
 #endif // TEST_STD_VER > 11
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size.pass.cpp
index ef75b6ce0..194daf9f9 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -142,4 +141,6 @@ int main()
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert((c.get_allocator() == min_allocator<std::pair<const int, std::string> >()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash.pass.cpp
index 998125391..4613e3ca5 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -144,4 +143,6 @@ int main()
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert((c.get_allocator() == min_allocator<std::pair<const int, std::string> >()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal.pass.cpp
index 1ca94641c..582b68b94 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -147,4 +146,6 @@ int main()
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert((c.get_allocator() == min_allocator<std::pair<const int, std::string> >()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal_allocator.pass.cpp
index e8efefbee..9019d9221 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -208,4 +207,6 @@ int main()
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A{});
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move.pass.cpp
index df69b5287..bfa2327e5 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -222,4 +221,6 @@ int main()
         assert(s2.size() == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_alloc.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_alloc.pass.cpp
index 0e004522c..d99c2ad9d 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, std::string> P;
@@ -290,4 +289,6 @@ int main()
 
         assert(c0.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_assign_noexcept.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_assign_noexcept.pass.cpp
index 2d5766946..e6f7f4c99 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<MoveOnly, MoveOnly> C;
@@ -71,4 +70,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_noexcept.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_noexcept.pass.cpp
index 7f3a337bd..68ec2600a 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -68,4 +67,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range.pass.cpp
index 7baf11f52..4b916fa41 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -263,4 +262,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size.pass.cpp
index bc16de5a2..aa45e0747 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -149,4 +148,6 @@ int main()
         assert((c.get_allocator() == min_allocator<std::pair<const int, std::string> >()));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash.pass.cpp
index 9ecfc5b79..ee9de7a4e 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -152,4 +151,6 @@ int main()
         assert((c.get_allocator() == min_allocator<std::pair<const int, std::string> >()));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal.pass.cpp
index 7c4c53578..54c1f1e9d 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -154,4 +153,6 @@ int main()
         assert((c.get_allocator() == min_allocator<std::pair<const int, std::string> >()));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal_allocator.pass.cpp
index 782105cb0..68181d714 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string,
@@ -218,4 +217,6 @@ int main()
         assert(c.get_allocator() == A{});
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.fail.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.fail.cpp
index b76fbc0ba..122e3aec3 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.fail.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<NotConstructible, NotConstructible,
@@ -67,4 +66,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.pass.cpp
index ae3d4f816..9b58de89d 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<NotConstructible, NotConstructible,
@@ -67,4 +66,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash.pass.cpp
index 742d4f291..8dceccf59 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<NotConstructible, NotConstructible,
@@ -71,4 +70,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal.pass.cpp
index 88cce517c..5d32ec29b 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<NotConstructible, NotConstructible,
@@ -73,4 +72,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal_allocator.pass.cpp
index 2b3b0e2ab..254d89d99 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.cnstr/size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<NotConstructible, NotConstructible,
@@ -97,4 +96,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/clear.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/clear.pass.cpp
index 15c78208a..71c3c57c2 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/clear.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -61,4 +60,6 @@ int main()
         assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace.pass.cpp
index 68e5267a9..1a20fb876 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "../../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, Emplaceable> C;
@@ -69,4 +68,6 @@ int main()
         assert(r->first == 5);
         assert(r->second == Emplaceable(6, 7));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace_hint.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace_hint.pass.cpp
index 86950e289..ef2904f36 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace_hint.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "min_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, Emplaceable> C;
@@ -89,4 +88,6 @@ int main()
         assert(r->first == 3);
         LIBCPP_ASSERT(r->second == Emplaceable(5, 6));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
index 092f3dd91..5ab975077 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct TemplateConstructor
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -144,4 +143,6 @@ int main()
             m.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db1.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db1.pass.cpp
index 83ccf3b73..30fae95f7 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <unordered_map>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -32,8 +31,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db2.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db2.pass.cpp
index fffcfa691..3c0418497 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cstdlib>
 #include <exception>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -35,8 +34,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db1.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db1.pass.cpp
index be6caba59..6c3a2cf38 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db2.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db2.pass.cpp
index a6d54084e..6b0ea3528 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db3.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db3.pass.cpp
index 301cfb440..0b53c1cdf 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db3.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db4.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db4.pass.cpp
index b53b486a5..7cea5e789 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db4.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_iter_iter_db4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<int, int> P;
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_key.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_key.pass.cpp
index 0da6f8a56..5e19c970a 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_key.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ bool only_deletions ( const Unordered &whole, const Unordered &part ) {
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -386,4 +385,6 @@ int main()
     assert (only_deletions (m, m2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_range.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_range.pass.cpp
index f239af4af..50f058422 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_range.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -177,4 +176,6 @@ int main()
         assert(k == c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp
index adb2ddb2b..a06aca774 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using map_type = std::unordered_multimap<int, int>;
@@ -64,4 +63,6 @@ int main()
         min_alloc_map m = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}, {6, 6}};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp
index 8cf26fc77..272d5acfb 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_multimap<int, int> m =
@@ -74,4 +73,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_allocator_requirements.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_allocator_requirements.pass.cpp
index 30f78936f..73fe6b49b 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_allocator_requirements.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,8 +19,10 @@
 #include "container_test_types.h"
 #include "../../../map_allocator_requirement_test_templates.h"
 
-int main()
+int main(int, char**)
 {
   testMultimapInsert<TCT::unordered_multimap<> >();
   testMultimapInsertHint<TCT::unordered_multimap<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_const_lvalue.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_const_lvalue.pass.cpp
index b87b7e372..8eaa69509 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ void do_insert_const_lvalue_test()
     assert(r->second == 4);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_const_lvalue_test<std::unordered_multimap<double, int> >();
 #if TEST_STD_VER >= 11
@@ -62,4 +61,6 @@ int main()
         do_insert_const_lvalue_test<C>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_const_lvalue.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_const_lvalue.pass.cpp
index 34cb1b293..83cf7b86a 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ void do_insert_const_lvalue_test()
     assert(r->second == 4);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_const_lvalue_test<std::unordered_multimap<double, int> >();
 #if TEST_STD_VER >= 11
@@ -80,4 +79,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_rvalue.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_rvalue.pass.cpp
index 94faa8f7f..2993fe757 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_hint_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<double, int> C;
@@ -174,4 +173,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_init.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_init.pass.cpp
index ef1577170..3a3f98785 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_init.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -118,4 +117,6 @@ int main()
         assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
         assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type.pass.cpp
index 93c0462b3..fd1cfa114 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,10 +67,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_multimap<int, int> m;
     test(m);
     std::unordered_multimap<int, int, std::hash<int>, std::equal_to<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp
index 99a47cabb..70d207551 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,10 +53,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_multimap<int, int> m;
     test(m);
     std::unordered_multimap<int, int, std::hash<int>, std::equal_to<int>, min_allocator<std::pair<const int, int>>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_range.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_range.pass.cpp
index 483f22050..333392af9 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_range.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<int, std::string> C;
@@ -119,4 +118,6 @@ int main()
         assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_rvalue.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_rvalue.pass.cpp
index 0c8ffeb10..92b91b07c 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multimap<double, int> C;
@@ -153,4 +152,6 @@ int main()
         assert(r->first == 5.5);
         assert(r->second == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp
index b7f61ca5a..1ce1c8361 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.modifiers/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_hasher
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_multimap<int, int> src{{1, 0}, {3, 0}, {5, 0}};
@@ -154,4 +153,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.swap/db_swap_1.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.swap/db_swap_1.pass.cpp
index a332b6fa4..3e15211d5 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.swap/db_swap_1.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.swap/db_swap_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <unordered_map>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if _LIBCPP_DEBUG >= 1
     {
@@ -41,4 +40,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_noexcept.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_noexcept.pass.cpp
index 33d8e3c36..971fff793 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -119,7 +118,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<const MoveOnly, MoveOnly> V;
     {
@@ -188,4 +187,6 @@ int main()
     }
 #endif // _LIBCPP_VERSION
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp b/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp
index 644af867d..406978241 100644
--- a/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp
+++ b/test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -580,4 +579,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/allocator_mismatch.fail.cpp b/test/std/containers/unord/unord.multiset/allocator_mismatch.fail.cpp
index 5836cb366..6183761a3 100644
--- a/test/std/containers/unord/unord.multiset/allocator_mismatch.fail.cpp
+++ b/test/std/containers/unord/unord.multiset/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <unordered_set>
 
-int main()
+int main(int, char**)
 {
     std::unordered_multiset<int, std::hash<int>, std::less<int>, std::allocator<long> > v;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/bucket.pass.cpp b/test/std/containers/unord/unord.multiset/bucket.pass.cpp
index b0fb9b334..4aeb84933 100644
--- a/test/std/containers/unord/unord.multiset/bucket.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/bucket.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -74,4 +73,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/bucket_count.pass.cpp b/test/std/containers/unord/unord.multiset/bucket_count.pass.cpp
index c60a81167..8f389ebc2 100644
--- a/test/std/containers/unord/unord.multiset/bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -71,4 +70,6 @@ int main()
         assert(c.bucket_count() >= 8);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/bucket_size.pass.cpp b/test/std/containers/unord/unord.multiset/bucket_size.pass.cpp
index 237b89036..99b76972a 100644
--- a/test/std/containers/unord/unord.multiset/bucket_size.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/bucket_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -82,4 +81,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/clear.pass.cpp b/test/std/containers/unord/unord.multiset/clear.pass.cpp
index b699d0624..01ff04593 100644
--- a/test/std/containers/unord/unord.multiset/clear.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -60,4 +59,6 @@ int main()
         assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/count.pass.cpp b/test/std/containers/unord/unord.multiset/count.pass.cpp
index 9f61845fa..40cef2af2 100644
--- a/test/std/containers/unord/unord.multiset/count.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -67,4 +66,6 @@ int main()
         assert(c.count(5) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/db_iterators_7.pass.cpp b/test/std/containers/unord/unord.multiset/db_iterators_7.pass.cpp
index 91f083b24..8da630233 100644
--- a/test/std/containers/unord/unord.multiset/db_iterators_7.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/db_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -51,8 +50,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/db_iterators_8.pass.cpp b/test/std/containers/unord/unord.multiset/db_iterators_8.pass.cpp
index 3d78ed4c0..8bc1e5c16 100644
--- a/test/std/containers/unord/unord.multiset/db_iterators_8.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/db_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/db_local_iterators_7.pass.cpp b/test/std/containers/unord/unord.multiset/db_local_iterators_7.pass.cpp
index cf8874803..fbf40ca6e 100644
--- a/test/std/containers/unord/unord.multiset/db_local_iterators_7.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/db_local_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/db_local_iterators_8.pass.cpp b/test/std/containers/unord/unord.multiset/db_local_iterators_8.pass.cpp
index 46e5ba7d5..53c9c9bd5 100644
--- a/test/std/containers/unord/unord.multiset/db_local_iterators_8.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/db_local_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/emplace.pass.cpp b/test/std/containers/unord/unord.multiset/emplace.pass.cpp
index 5d925c8d4..67c5d1642 100644
--- a/test/std/containers/unord/unord.multiset/emplace.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<Emplaceable> C;
@@ -59,4 +58,6 @@ int main()
         assert(c.size() == 3);
         assert(*r == Emplaceable(5, 6));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/emplace_hint.pass.cpp b/test/std/containers/unord/unord.multiset/emplace_hint.pass.cpp
index d9bab1f49..61f06edd4 100644
--- a/test/std/containers/unord/unord.multiset/emplace_hint.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<Emplaceable> C;
@@ -62,4 +61,6 @@ int main()
         assert(c.size() == 3);
         assert(*r == Emplaceable(5, 6));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/empty.fail.cpp b/test/std/containers/unord/unord.multiset/empty.fail.cpp
index 8e068a4e1..449b2116a 100644
--- a/test/std/containers/unord/unord.multiset/empty.fail.cpp
+++ b/test/std/containers/unord/unord.multiset/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::unordered_multiset<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/empty.pass.cpp b/test/std/containers/unord/unord.multiset/empty.pass.cpp
index 8c65bc23b..078f95f56 100644
--- a/test/std/containers/unord/unord.multiset/empty.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multiset<int> M;
@@ -43,4 +42,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/eq.pass.cpp b/test/std/containers/unord/unord.multiset/eq.pass.cpp
index 9c59d0cf5..761ad7051 100644
--- a/test/std/containers/unord/unord.multiset/eq.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -177,4 +176,6 @@ int main()
         assert(!(c1 != c2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/equal_range_const.pass.cpp b/test/std/containers/unord/unord.multiset/equal_range_const.pass.cpp
index e89410e61..ddfd77e18 100644
--- a/test/std/containers/unord/unord.multiset/equal_range_const.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/equal_range_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -87,4 +86,6 @@ int main()
         assert(*r.first == 50);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/equal_range_non_const.pass.cpp b/test/std/containers/unord/unord.multiset/equal_range_non_const.pass.cpp
index a9373cec6..a148f65b1 100644
--- a/test/std/containers/unord/unord.multiset/equal_range_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/equal_range_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -87,4 +86,6 @@ int main()
         assert(*r.first == 50);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp b/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
index 362697b2c..0a92f7d06 100644
--- a/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct TemplateConstructor
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -97,4 +96,6 @@ int main()
             m.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/erase_if.pass.cpp b/test/std/containers/unord/unord.multiset/erase_if.pass.cpp
index 7a9d93d43..bd587473c 100644
--- a/test/std/containers/unord/unord.multiset/erase_if.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -80,7 +79,7 @@ void test()
     test0<S>({1,2,3}, False, {1,2,3});
 }
 
-int main()
+int main(int, char**)
 {
     test<std::unordered_multiset<int>>();
     test<std::unordered_multiset<int, std::hash<int>, std::equal_to<int>, min_allocator<int>>> ();
@@ -88,4 +87,6 @@ int main()
 
     test<std::unordered_multiset<long>>();
     test<std::unordered_multiset<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/erase_iter_db1.pass.cpp b/test/std/containers/unord/unord.multiset/erase_iter_db1.pass.cpp
index baad3858b..073043f5a 100644
--- a/test/std/containers/unord/unord.multiset/erase_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <unordered_set>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -31,8 +30,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/erase_iter_db2.pass.cpp b/test/std/containers/unord/unord.multiset/erase_iter_db2.pass.cpp
index a21f29ef7..28768eaf5 100644
--- a/test/std/containers/unord/unord.multiset/erase_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cstdlib>
 #include <exception>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/erase_iter_iter_db1.pass.cpp b/test/std/containers/unord/unord.multiset/erase_iter_iter_db1.pass.cpp
index 03c9ec5d0..0a9853d66 100644
--- a/test/std/containers/unord/unord.multiset/erase_iter_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_iter_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/erase_iter_iter_db2.pass.cpp b/test/std/containers/unord/unord.multiset/erase_iter_iter_db2.pass.cpp
index 4c6f209f1..cc1ec0096 100644
--- a/test/std/containers/unord/unord.multiset/erase_iter_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_iter_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/erase_iter_iter_db3.pass.cpp b/test/std/containers/unord/unord.multiset/erase_iter_iter_db3.pass.cpp
index 5ce378974..a1de8cb7c 100644
--- a/test/std/containers/unord/unord.multiset/erase_iter_iter_db3.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_iter_iter_db3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/erase_iter_iter_db4.pass.cpp b/test/std/containers/unord/unord.multiset/erase_iter_iter_db4.pass.cpp
index 7c362a2a2..a82ecfc3c 100644
--- a/test/std/containers/unord/unord.multiset/erase_iter_iter_db4.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_iter_iter_db4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -32,8 +31,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.multiset/erase_key.pass.cpp b/test/std/containers/unord/unord.multiset/erase_key.pass.cpp
index e8ff71d03..ba7248d74 100644
--- a/test/std/containers/unord/unord.multiset/erase_key.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ bool only_deletions ( const Unordered &whole, const Unordered &part ) {
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -173,4 +172,6 @@ int main()
     assert (only_deletions (m, m2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/erase_range.pass.cpp b/test/std/containers/unord/unord.multiset/erase_range.pass.cpp
index 14eb7c477..c6bb4b597 100644
--- a/test/std/containers/unord/unord.multiset/erase_range.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -92,4 +91,6 @@ int main()
         assert(k == c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp b/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp
index 1595c55a4..01994120c 100644
--- a/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using set_type = std::unordered_multiset<int>;
@@ -57,4 +56,6 @@ int main()
         min_alloc_set m = {1, 2, 3, 4, 5, 6};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/extract_key.pass.cpp b/test/std/containers/unord/unord.multiset/extract_key.pass.cpp
index ffe46fb30..380b39f85 100644
--- a/test/std/containers/unord/unord.multiset/extract_key.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_multiset<int> m = {1, 2, 3, 4, 5, 6};
@@ -68,4 +67,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/find_const.pass.cpp b/test/std/containers/unord/unord.multiset/find_const.pass.cpp
index 505266b1f..efa8bfc12 100644
--- a/test/std/containers/unord/unord.multiset/find_const.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/find_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -65,4 +64,6 @@ int main()
         assert(i == c.cend());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/find_non_const.pass.cpp b/test/std/containers/unord/unord.multiset/find_non_const.pass.cpp
index 32ee79aa7..4eeb8ac6a 100644
--- a/test/std/containers/unord/unord.multiset/find_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/find_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -65,4 +64,6 @@ int main()
         assert(i == c.cend());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/incomplete.pass.cpp b/test/std/containers/unord/unord.multiset/incomplete.pass.cpp
index 1b3c1492c..0aeb246ca 100644
--- a/test/std/containers/unord/unord.multiset/incomplete.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/incomplete.pass.cpp
@@ -2,10 +2,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,6 +32,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_const_lvalue.pass.cpp b/test/std/containers/unord/unord.multiset/insert_const_lvalue.pass.cpp
index 414e8fa48..8200dc2fc 100644
--- a/test/std/containers/unord/unord.multiset/insert_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void do_insert_const_lvalue_test()
     assert(*r == 5.5);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_const_lvalue_test<std::unordered_multiset<double> >();
 #if TEST_STD_VER >= 11
@@ -57,4 +56,6 @@ int main()
         do_insert_const_lvalue_test<C>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_emplace_allocator_requirements.pass.cpp b/test/std/containers/unord/unord.multiset/insert_emplace_allocator_requirements.pass.cpp
index 4b6e2f769..d7474f24e 100644
--- a/test/std/containers/unord/unord.multiset/insert_emplace_allocator_requirements.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_emplace_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 #include "container_test_types.h"
 #include "../../set_allocator_requirement_test_templates.h"
 
-int main()
+int main(int, char**)
 {
   testMultisetInsert<TCT::unordered_multiset<> >();
   testMultisetEmplace<TCT::unordered_multiset<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_hint_const_lvalue.pass.cpp b/test/std/containers/unord/unord.multiset/insert_hint_const_lvalue.pass.cpp
index 8ce6a5efb..ede013ef9 100644
--- a/test/std/containers/unord/unord.multiset/insert_hint_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_hint_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ void do_insert_hint_const_lvalue_test()
     assert(*r == 5.5);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_hint_const_lvalue_test<std::unordered_multiset<double> >();
 #if TEST_STD_VER >= 11
@@ -75,4 +74,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_hint_rvalue.pass.cpp b/test/std/containers/unord/unord.multiset/insert_hint_rvalue.pass.cpp
index ffe6534b2..ab5302462 100644
--- a/test/std/containers/unord/unord.multiset/insert_hint_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_hint_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<double> C;
@@ -116,4 +115,6 @@ int main()
         assert(*r == 5);
     }
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_init.pass.cpp b/test/std/containers/unord/unord.multiset/insert_init.pass.cpp
index 88661b569..4467c74b4 100644
--- a/test/std/containers/unord/unord.multiset/insert_init.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -66,4 +65,6 @@ int main()
         assert(c.count(3) == 1);
         assert(c.count(4) == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_node_type.pass.cpp b/test/std/containers/unord/unord.multiset/insert_node_type.pass.cpp
index c3d4cd2a0..c660ab22d 100644
--- a/test/std/containers/unord/unord.multiset/insert_node_type.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,10 +66,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_multiset<int> m;
     test(m);
     std::unordered_multiset<int, std::hash<int>, std::equal_to<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp b/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp
index 79712d3de..e95dd31e3 100644
--- a/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,10 +49,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_multiset<int> m;
     test(m);
     std::unordered_multiset<int, std::hash<int>, std::equal_to<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_range.pass.cpp b/test/std/containers/unord/unord.multiset/insert_range.pass.cpp
index 3d36ff9d4..b8742f520 100644
--- a/test/std/containers/unord/unord.multiset/insert_range.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -67,4 +66,6 @@ int main()
         assert(c.count(4) == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/insert_rvalue.pass.cpp b/test/std/containers/unord/unord.multiset/insert_rvalue.pass.cpp
index 893949010..1bec2b7e6 100644
--- a/test/std/containers/unord/unord.multiset/insert_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/insert_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<double> C;
@@ -112,4 +111,6 @@ int main()
         assert(*r == 5);
     }
 #endif  // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/iterators.fail.cpp b/test/std/containers/unord/unord.multiset/iterators.fail.cpp
index 9f309a234..2c282fdba 100644
--- a/test/std/containers/unord/unord.multiset/iterators.fail.cpp
+++ b/test/std/containers/unord/unord.multiset/iterators.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -66,4 +65,6 @@ int main()
         assert(std::distance(c.begin(), c.end()) == c.size());
         assert(std::distance(c.cbegin(), c.cend()) == c.size());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/iterators.pass.cpp b/test/std/containers/unord/unord.multiset/iterators.pass.cpp
index d87099cda..2c0cd496d 100644
--- a/test/std/containers/unord/unord.multiset/iterators.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -126,4 +125,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/load_factor.pass.cpp b/test/std/containers/unord/unord.multiset/load_factor.pass.cpp
index df2cb7bef..bb3350e86 100644
--- a/test/std/containers/unord/unord.multiset/load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -72,4 +71,6 @@ int main()
         assert(c.load_factor() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/local_iterators.fail.cpp b/test/std/containers/unord/unord.multiset/local_iterators.fail.cpp
index a43e49357..d6f1a55fd 100644
--- a/test/std/containers/unord/unord.multiset/local_iterators.fail.cpp
+++ b/test/std/containers/unord/unord.multiset/local_iterators.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -260,4 +259,6 @@ int main()
         j = c.cend(b);
         assert(std::distance(i, j) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/local_iterators.pass.cpp b/test/std/containers/unord/unord.multiset/local_iterators.pass.cpp
index 8ba9f0f95..5aa657563 100644
--- a/test/std/containers/unord/unord.multiset/local_iterators.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/local_iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -497,4 +496,6 @@ int main()
         assert(std::distance(i, j) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/max_bucket_count.pass.cpp b/test/std/containers/unord/unord.multiset/max_bucket_count.pass.cpp
index 510ba5fe4..7fb76c41c 100644
--- a/test/std/containers/unord/unord.multiset/max_bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/max_bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -35,4 +34,6 @@ int main()
         assert(c.max_bucket_count() > 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/max_load_factor.pass.cpp b/test/std/containers/unord/unord.multiset/max_load_factor.pass.cpp
index f7ebaaf65..c89aa6d33 100644
--- a/test/std/containers/unord/unord.multiset/max_load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/max_load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -63,4 +62,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/max_size.pass.cpp b/test/std/containers/unord/unord.multiset/max_size.pass.cpp
index e76624e5c..d08cdb622 100644
--- a/test/std/containers/unord/unord.multiset/max_size.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
       typedef limited_allocator<int, 10> A;
@@ -51,4 +50,6 @@ int main()
       assert(c.max_size() <= max_dist);
       assert(c.max_size() <= alloc_max_size(c.get_allocator()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/merge.pass.cpp b/test/std/containers/unord/unord.multiset/merge.pass.cpp
index 7913f9564..e951b33d2 100644
--- a/test/std/containers/unord/unord.multiset/merge.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_hasher
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_multiset<int> src{1, 3, 5};
@@ -151,4 +150,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/rehash.pass.cpp b/test/std/containers/unord/unord.multiset/rehash.pass.cpp
index 83fb58d8a..8c6699b18 100644
--- a/test/std/containers/unord/unord.multiset/rehash.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/rehash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test(const C& c)
     assert(c.count(4) == 1);
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -100,4 +99,6 @@ int main()
         test(c);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/reserve.pass.cpp b/test/std/containers/unord/unord.multiset/reserve.pass.cpp
index 28187e9ca..54eada5a7 100644
--- a/test/std/containers/unord/unord.multiset/reserve.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/reserve.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void reserve_invariant(size_t n) // LWG #2156
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int> C;
@@ -104,4 +103,6 @@ int main()
     }
 #endif
     reserve_invariant(20);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/scary.pass.cpp b/test/std/containers/unord/unord.multiset/scary.pass.cpp
index aec6950c4..670c6406a 100644
--- a/test/std/containers/unord/unord.multiset/scary.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/scary.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 
 #include <unordered_set>
 
-int main()
+int main(int, char**)
 {
     typedef std::unordered_set<int> M1;
     typedef std::unordered_multiset<int> M2;
     M2::iterator i;
     M1::iterator j = i;
     ((void)j);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/size.pass.cpp b/test/std/containers/unord/unord.multiset/size.pass.cpp
index 2c23202ce..12a4733cc 100644
--- a/test/std/containers/unord/unord.multiset/size.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_multiset<int> M;
@@ -59,4 +58,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/swap_member.pass.cpp b/test/std/containers/unord/unord.multiset/swap_member.pass.cpp
index 9ffe3ad48..bad8df9d9 100644
--- a/test/std/containers/unord/unord.multiset/swap_member.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/swap_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -567,4 +566,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/types.pass.cpp b/test/std/containers/unord/unord.multiset/types.pass.cpp
index ee5c2c38a..81f8334c2 100644
--- a/test/std/containers/unord/unord.multiset/types.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<short> C;
@@ -66,4 +65,6 @@ int main()
         static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/allocator.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/allocator.pass.cpp
index 867ca93fb..2a3b867b5 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<NotConstructible,
@@ -107,4 +106,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_copy.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_copy.pass.cpp
index e1794c0d8..1fcd71002 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_copy.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<int> A;
@@ -210,4 +209,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_init.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_init.pass.cpp
index 5ab0209ce..795370c44 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_init.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<int> A;
@@ -94,4 +93,6 @@ int main()
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_move.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_move.pass.cpp
index 17ac618fa..1ed77851c 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_move.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<int> A;
@@ -264,4 +263,6 @@ int main()
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/compare_copy_constructible.fail.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/compare_copy_constructible.fail.cpp
index 1b81905b6..4b8d55cac 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_multiset<int, std::hash<int>, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy.pass.cpp
index 3ba35d7a5..f3ca15241 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -169,4 +168,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy_alloc.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy_alloc.pass.cpp
index 2c018e077..4e99490ea 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -123,4 +122,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default.pass.cpp
index 4b4487f00..bb762b576 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<NotConstructible,
@@ -105,4 +104,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default_noexcept.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default_noexcept.pass.cpp
index 3b69c1eed..4acda3255 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -72,4 +71,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/dtor_noexcept.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/dtor_noexcept.pass.cpp
index 1e927b9b3..1d963b6be 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/dtor_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<MoveOnly> C;
@@ -65,4 +64,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/hash_copy_constructible.fail.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/hash_copy_constructible.fail.cpp
index cae8ab973..9e24ce2ec 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/hash_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/hash_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_multiset<int, Hash<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init.pass.cpp
index d98b9a7d0..d8fc0c002 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -161,4 +160,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif // TEST_STD_VER > 11
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size.pass.cpp
index b83507934..bda874ce5 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -95,4 +94,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash.pass.cpp
index 92edfc35b..5c81a3461 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -98,4 +97,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal.pass.cpp
index 877306db6..c77d85057 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -100,4 +99,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal_allocator.pass.cpp
index e77be8463..8a26b3948 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -102,4 +101,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move.pass.cpp
index 9fbb773a4..196044f21 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -172,4 +171,6 @@ int main()
         assert(s2.size() == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_alloc.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_alloc.pass.cpp
index fb144d9b1..eb567a9da 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int P;
@@ -203,4 +202,6 @@ int main()
 
         assert(c0.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_assign_noexcept.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_assign_noexcept.pass.cpp
index 7336bb5af..4b0051a9b 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<MoveOnly> C;
@@ -71,4 +70,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_noexcept.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_noexcept.pass.cpp
index fcf2a5af3..3941940f9 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -68,4 +67,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range.pass.cpp
index fd3b76316..953e702a6 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -167,4 +166,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size.pass.cpp
index f09f9c860..2b7e911cd 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -101,4 +100,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash.pass.cpp
index 167216bf6..1b3944130 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -104,4 +103,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal.pass.cpp
index 8720f59a8..d83555f57 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -106,4 +105,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal_allocator.pass.cpp
index 3373dd0d4..10c69c27a 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<int,
@@ -109,4 +108,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.fail.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.fail.cpp
index c3056d2f9..45d67f33a 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.fail.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<NotConstructible,
@@ -63,4 +62,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.pass.cpp
index c6f12e9ac..ba32ec370 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<NotConstructible,
@@ -63,4 +62,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash.pass.cpp
index 10d48b73e..47d0867f0 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<NotConstructible,
@@ -67,4 +66,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal.pass.cpp
index 6b545a1da..f9cc2503b 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<NotConstructible,
@@ -69,4 +68,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal_allocator.pass.cpp
index 5c87a3a20..8e25bf00e 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.cnstr/size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<NotConstructible,
@@ -71,4 +70,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.swap/db_swap_1.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.swap/db_swap_1.pass.cpp
index 9470b1a6f..a546d0d7d 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.swap/db_swap_1.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.swap/db_swap_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <unordered_set>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if _LIBCPP_DEBUG >= 1
     {
@@ -40,4 +39,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_noexcept.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_noexcept.pass.cpp
index 4afef42e6..3586e8d5b 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -119,7 +118,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_multiset<MoveOnly> C;
@@ -187,4 +186,6 @@ int main()
     }
 #endif // _LIBCPP_VERSION
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_non_member.pass.cpp b/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_non_member.pass.cpp
index ce290ff1c..706c995f3 100644
--- a/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_non_member.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_non_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -567,4 +566,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/allocator_mismatch.fail.cpp b/test/std/containers/unord/unord.set/allocator_mismatch.fail.cpp
index b87c9a24d..0d1341e69 100644
--- a/test/std/containers/unord/unord.set/allocator_mismatch.fail.cpp
+++ b/test/std/containers/unord/unord.set/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <unordered_set>
 
-int main()
+int main(int, char**)
 {
     std::unordered_set<int, std::hash<int>, std::less<int>, std::allocator<long> > v;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/bucket.pass.cpp b/test/std/containers/unord/unord.set/bucket.pass.cpp
index 3903d96c1..2215b9949 100644
--- a/test/std/containers/unord/unord.set/bucket.pass.cpp
+++ b/test/std/containers/unord/unord.set/bucket.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -73,4 +72,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/bucket_count.pass.cpp b/test/std/containers/unord/unord.set/bucket_count.pass.cpp
index 227d9e123..3a1a78cb3 100644
--- a/test/std/containers/unord/unord.set/bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.set/bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -69,4 +68,6 @@ int main()
         assert(c.bucket_count() >= 8);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/bucket_size.pass.cpp b/test/std/containers/unord/unord.set/bucket_size.pass.cpp
index 10dc099ea..6ca89d572 100644
--- a/test/std/containers/unord/unord.set/bucket_size.pass.cpp
+++ b/test/std/containers/unord/unord.set/bucket_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -77,4 +76,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/clear.pass.cpp b/test/std/containers/unord/unord.set/clear.pass.cpp
index 2f2239129..ab04cdd91 100644
--- a/test/std/containers/unord/unord.set/clear.pass.cpp
+++ b/test/std/containers/unord/unord.set/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -59,4 +58,6 @@ int main()
         assert(c.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/count.pass.cpp b/test/std/containers/unord/unord.set/count.pass.cpp
index 18cac7cf9..971e126fd 100644
--- a/test/std/containers/unord/unord.set/count.pass.cpp
+++ b/test/std/containers/unord/unord.set/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -66,4 +65,6 @@ int main()
         assert(c.count(5) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/db_iterators_7.pass.cpp b/test/std/containers/unord/unord.set/db_iterators_7.pass.cpp
index 647e30b80..8420de60d 100644
--- a/test/std/containers/unord/unord.set/db_iterators_7.pass.cpp
+++ b/test/std/containers/unord/unord.set/db_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -51,8 +50,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/db_iterators_8.pass.cpp b/test/std/containers/unord/unord.set/db_iterators_8.pass.cpp
index 4c303194c..14dccf97d 100644
--- a/test/std/containers/unord/unord.set/db_iterators_8.pass.cpp
+++ b/test/std/containers/unord/unord.set/db_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/db_local_iterators_7.pass.cpp b/test/std/containers/unord/unord.set/db_local_iterators_7.pass.cpp
index 9dbd43d2f..ac066af7f 100644
--- a/test/std/containers/unord/unord.set/db_local_iterators_7.pass.cpp
+++ b/test/std/containers/unord/unord.set/db_local_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -50,8 +49,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/db_local_iterators_8.pass.cpp b/test/std/containers/unord/unord.set/db_local_iterators_8.pass.cpp
index 1212321fe..a1595cd36 100644
--- a/test/std/containers/unord/unord.set/db_local_iterators_8.pass.cpp
+++ b/test/std/containers/unord/unord.set/db_local_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef int T;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/emplace.pass.cpp b/test/std/containers/unord/unord.set/emplace.pass.cpp
index c09ad1505..6616aa51c 100644
--- a/test/std/containers/unord/unord.set/emplace.pass.cpp
+++ b/test/std/containers/unord/unord.set/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<Emplaceable> C;
@@ -65,4 +64,6 @@ int main()
         assert(*r.first == Emplaceable(5, 6));
         assert(!r.second);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/emplace_hint.pass.cpp b/test/std/containers/unord/unord.set/emplace_hint.pass.cpp
index 16f9eff19..55b3ccbc9 100644
--- a/test/std/containers/unord/unord.set/emplace_hint.pass.cpp
+++ b/test/std/containers/unord/unord.set/emplace_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "../../Emplaceable.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<Emplaceable> C;
@@ -62,4 +61,6 @@ int main()
         assert(c.size() == 2);
         assert(*r == Emplaceable(5, 6));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/empty.fail.cpp b/test/std/containers/unord/unord.set/empty.fail.cpp
index 23603c261..11273f44f 100644
--- a/test/std/containers/unord/unord.set/empty.fail.cpp
+++ b/test/std/containers/unord/unord.set/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::unordered_set<int> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/empty.pass.cpp b/test/std/containers/unord/unord.set/empty.pass.cpp
index de28cb256..ce9cfdcf5 100644
--- a/test/std/containers/unord/unord.set/empty.pass.cpp
+++ b/test/std/containers/unord/unord.set/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_set<int> M;
@@ -43,4 +42,6 @@ int main()
     assert(m.empty());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/eq.pass.cpp b/test/std/containers/unord/unord.set/eq.pass.cpp
index 8ff4ac5df..5362f57f4 100644
--- a/test/std/containers/unord/unord.set/eq.pass.cpp
+++ b/test/std/containers/unord/unord.set/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -156,4 +155,6 @@ int main()
         assert(!(c1 != c2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/equal_range_const.pass.cpp b/test/std/containers/unord/unord.set/equal_range_const.pass.cpp
index 9fa4129c3..9489deaf2 100644
--- a/test/std/containers/unord/unord.set/equal_range_const.pass.cpp
+++ b/test/std/containers/unord/unord.set/equal_range_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -78,4 +77,6 @@ int main()
         assert(*r.first == 50);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/equal_range_non_const.pass.cpp b/test/std/containers/unord/unord.set/equal_range_non_const.pass.cpp
index c6a42acea..6713dbd91 100644
--- a/test/std/containers/unord/unord.set/equal_range_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.set/equal_range_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -78,4 +77,6 @@ int main()
         assert(*r.first == 50);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp b/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp
index b584dbb2b..3d9cfe683 100644
--- a/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_const_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct TemplateConstructor
 bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
 struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -95,4 +94,6 @@ int main()
             m.erase(it);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/erase_if.pass.cpp b/test/std/containers/unord/unord.set/erase_if.pass.cpp
index e060fda1f..cbd2ebb1a 100644
--- a/test/std/containers/unord/unord.set/erase_if.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -70,7 +69,7 @@ void test()
     test0<S>({1,2,3}, False, {1,2,3});
 }
 
-int main()
+int main(int, char**)
 {
     test<std::unordered_set<int>>();
     test<std::unordered_set<int, std::hash<int>, std::equal_to<int>, min_allocator<int>>> ();
@@ -78,4 +77,6 @@ int main()
 
     test<std::unordered_set<long>>();
     test<std::unordered_set<double>>();
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/erase_iter_db1.pass.cpp b/test/std/containers/unord/unord.set/erase_iter_db1.pass.cpp
index 231152d14..a65086ee8 100644
--- a/test/std/containers/unord/unord.set/erase_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <unordered_set>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -31,8 +30,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/erase_iter_db2.pass.cpp b/test/std/containers/unord/unord.set/erase_iter_db2.pass.cpp
index 06d61db01..c7f64da35 100644
--- a/test/std/containers/unord/unord.set/erase_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cstdlib>
 #include <exception>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -34,8 +33,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/erase_iter_iter_db1.pass.cpp b/test/std/containers/unord/unord.set/erase_iter_iter_db1.pass.cpp
index 92c77f556..002a24bf1 100644
--- a/test/std/containers/unord/unord.set/erase_iter_iter_db1.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_iter_iter_db1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/erase_iter_iter_db2.pass.cpp b/test/std/containers/unord/unord.set/erase_iter_iter_db2.pass.cpp
index d60665896..59bf0cc33 100644
--- a/test/std/containers/unord/unord.set/erase_iter_iter_db2.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_iter_iter_db2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/erase_iter_iter_db3.pass.cpp b/test/std/containers/unord/unord.set/erase_iter_iter_db3.pass.cpp
index f7ff42621..c522fce26 100644
--- a/test/std/containers/unord/unord.set/erase_iter_iter_db3.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_iter_iter_db3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -33,8 +32,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/erase_iter_iter_db4.pass.cpp b/test/std/containers/unord/unord.set/erase_iter_iter_db4.pass.cpp
index 6cde216f4..a7c3c0020 100644
--- a/test/std/containers/unord/unord.set/erase_iter_iter_db4.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_iter_iter_db4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <exception>
 #include <cstdlib>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {1, 2, 3};
@@ -32,8 +31,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/containers/unord/unord.set/erase_key.pass.cpp b/test/std/containers/unord/unord.set/erase_key.pass.cpp
index ea0323ba2..912a4ae6b 100644
--- a/test/std/containers/unord/unord.set/erase_key.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ bool only_deletions ( const Unordered &whole, const Unordered &part ) {
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -172,4 +171,6 @@ int main()
     assert (only_deletions (m, m2));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/erase_range.pass.cpp b/test/std/containers/unord/unord.set/erase_range.pass.cpp
index ca8250c1e..907063c6a 100644
--- a/test/std/containers/unord/unord.set/erase_range.pass.cpp
+++ b/test/std/containers/unord/unord.set/erase_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -91,4 +90,6 @@ int main()
         assert(k == c.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/extract_iterator.pass.cpp b/test/std/containers/unord/unord.set/extract_iterator.pass.cpp
index 40feb0e2f..03dfcc602 100644
--- a/test/std/containers/unord/unord.set/extract_iterator.pass.cpp
+++ b/test/std/containers/unord/unord.set/extract_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test(Container& c)
     assert(c.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         using set_type = std::unordered_set<int>;
@@ -57,4 +56,6 @@ int main()
         min_alloc_set m = {1, 2, 3, 4, 5, 6};
         test(m);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/extract_key.pass.cpp b/test/std/containers/unord/unord.set/extract_key.pass.cpp
index f686342b2..b2a6f0493 100644
--- a/test/std/containers/unord/unord.set/extract_key.pass.cpp
+++ b/test/std/containers/unord/unord.set/extract_key.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ void test(Container& c, KeyTypeIter first, KeyTypeIter last)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_set<int> m = {1, 2, 3, 4, 5, 6};
@@ -68,4 +67,6 @@ int main()
         int keys[] = {1, 2, 3, 4, 5, 6};
         test(m, std::begin(keys), std::end(keys));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/find_const.pass.cpp b/test/std/containers/unord/unord.set/find_const.pass.cpp
index bd4542c87..f226a6960 100644
--- a/test/std/containers/unord/unord.set/find_const.pass.cpp
+++ b/test/std/containers/unord/unord.set/find_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -64,4 +63,6 @@ int main()
         assert(i == c.cend());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/find_non_const.pass.cpp b/test/std/containers/unord/unord.set/find_non_const.pass.cpp
index 4c81fc60a..4b24b2f44 100644
--- a/test/std/containers/unord/unord.set/find_non_const.pass.cpp
+++ b/test/std/containers/unord/unord.set/find_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -64,4 +63,6 @@ int main()
         assert(i == c.cend());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/incomplete.pass.cpp b/test/std/containers/unord/unord.set/incomplete.pass.cpp
index 4f7a00c99..b77f679fe 100644
--- a/test/std/containers/unord/unord.set/incomplete.pass.cpp
+++ b/test/std/containers/unord/unord.set/incomplete.pass.cpp
@@ -2,10 +2,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,6 +32,8 @@ struct A {
 
 inline bool operator==(A const& L, A const& R) { return &L == &R; }
 
-int main() {
+int main(int, char**) {
     A a;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_and_emplace_allocator_requirements.pass.cpp b/test/std/containers/unord/unord.set/insert_and_emplace_allocator_requirements.pass.cpp
index e85e94538..34905e3c8 100644
--- a/test/std/containers/unord/unord.set/insert_and_emplace_allocator_requirements.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_and_emplace_allocator_requirements.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@
 #include "../../set_allocator_requirement_test_templates.h"
 
 
-int main()
+int main(int, char**)
 {
   testSetInsert<TCT::unordered_set<> >();
   testSetEmplace<TCT::unordered_set<> >();
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_const_lvalue.pass.cpp b/test/std/containers/unord/unord.set/insert_const_lvalue.pass.cpp
index 712176ede..097b221a6 100644
--- a/test/std/containers/unord/unord.set/insert_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ void do_insert_const_lvalue_test()
     assert(r.second);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_const_lvalue_test<std::unordered_set<double> >();
 #if TEST_STD_VER >= 11
@@ -61,4 +60,6 @@ int main()
         do_insert_const_lvalue_test<C>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_hint_const_lvalue.pass.cpp b/test/std/containers/unord/unord.set/insert_hint_const_lvalue.pass.cpp
index 50f0f6bc8..e3765ca02 100644
--- a/test/std/containers/unord/unord.set/insert_hint_const_lvalue.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_hint_const_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ void do_insert_hint_const_lvalue_test()
     assert(*r == 5.5);
 }
 
-int main()
+int main(int, char**)
 {
     do_insert_hint_const_lvalue_test<std::unordered_set<double> >();
 #if TEST_STD_VER >= 11
@@ -75,4 +74,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_hint_rvalue.pass.cpp b/test/std/containers/unord/unord.set/insert_hint_rvalue.pass.cpp
index 676c39527..071708e1e 100644
--- a/test/std/containers/unord/unord.set/insert_hint_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_hint_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<double> C;
@@ -116,4 +115,6 @@ int main()
         assert(*r == 5);
     }
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_init.pass.cpp b/test/std/containers/unord/unord.set/insert_init.pass.cpp
index c106fed10..c60fcb16b 100644
--- a/test/std/containers/unord/unord.set/insert_init.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -66,4 +65,6 @@ int main()
         assert(c.count(3) == 1);
         assert(c.count(4) == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_node_type.pass.cpp b/test/std/containers/unord/unord.set/insert_node_type.pass.cpp
index 6c91b5393..f41c93685 100644
--- a/test/std/containers/unord/unord.set/insert_node_type.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_node_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,10 +73,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_set<int> m;
     test(m);
     std::unordered_set<int, std::hash<int>, std::equal_to<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp b/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp
index 626f27271..ae5e8976e 100644
--- a/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_node_type_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,10 +51,12 @@ void test(Container& c)
     }
 }
 
-int main()
+int main(int, char**)
 {
     std::unordered_set<int> m;
     test(m);
     std::unordered_set<int, std::hash<int>, std::equal_to<int>, min_allocator<int>> m2;
     test(m2);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_range.pass.cpp b/test/std/containers/unord/unord.set/insert_range.pass.cpp
index 41b2c0e14..cb365483a 100644
--- a/test/std/containers/unord/unord.set/insert_range.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_iterators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -67,4 +66,6 @@ int main()
         assert(c.count(4) == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/insert_rvalue.pass.cpp b/test/std/containers/unord/unord.set/insert_rvalue.pass.cpp
index 45b168d89..9edab2740 100644
--- a/test/std/containers/unord/unord.set/insert_rvalue.pass.cpp
+++ b/test/std/containers/unord/unord.set/insert_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "MoveOnly.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<double> C;
@@ -128,4 +127,6 @@ int main()
         assert(r.second);
     }
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/iterators.fail.cpp b/test/std/containers/unord/unord.set/iterators.fail.cpp
index 2bb180b6e..de5f88e79 100644
--- a/test/std/containers/unord/unord.set/iterators.fail.cpp
+++ b/test/std/containers/unord/unord.set/iterators.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <unordered_set>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -64,4 +63,6 @@ int main()
         assert(std::distance(c.begin(), c.end()) == c.size());
         assert(std::distance(c.cbegin(), c.cend()) == c.size());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/iterators.pass.cpp b/test/std/containers/unord/unord.set/iterators.pass.cpp
index 9c780e109..eb8459101 100644
--- a/test/std/containers/unord/unord.set/iterators.pass.cpp
+++ b/test/std/containers/unord/unord.set/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -126,4 +125,6 @@ int main()
         assert (!(cii != ii1 ));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/load_factor.pass.cpp b/test/std/containers/unord/unord.set/load_factor.pass.cpp
index 94eb5d1bd..c5857b7b4 100644
--- a/test/std/containers/unord/unord.set/load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.set/load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -72,4 +71,6 @@ int main()
         assert(c.load_factor() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/local_iterators.fail.cpp b/test/std/containers/unord/unord.set/local_iterators.fail.cpp
index eb671a442..7bacd2f6f 100644
--- a/test/std/containers/unord/unord.set/local_iterators.fail.cpp
+++ b/test/std/containers/unord/unord.set/local_iterators.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <unordered_set>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -258,4 +257,6 @@ int main()
         j = c.cend(b);
         assert(std::distance(i, j) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/local_iterators.pass.cpp b/test/std/containers/unord/unord.set/local_iterators.pass.cpp
index 55c80e4cb..ad3de5b0a 100644
--- a/test/std/containers/unord/unord.set/local_iterators.pass.cpp
+++ b/test/std/containers/unord/unord.set/local_iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -385,4 +384,6 @@ int main()
         assert(*i == 4);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/max_bucket_count.pass.cpp b/test/std/containers/unord/unord.set/max_bucket_count.pass.cpp
index dab13ea5a..121147a08 100644
--- a/test/std/containers/unord/unord.set/max_bucket_count.pass.cpp
+++ b/test/std/containers/unord/unord.set/max_bucket_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -35,4 +34,6 @@ int main()
         assert(c.max_bucket_count() > 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/max_load_factor.pass.cpp b/test/std/containers/unord/unord.set/max_load_factor.pass.cpp
index e9e04bca8..ac345a1d4 100644
--- a/test/std/containers/unord/unord.set/max_load_factor.pass.cpp
+++ b/test/std/containers/unord/unord.set/max_load_factor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -63,4 +62,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/max_size.pass.cpp b/test/std/containers/unord/unord.set/max_size.pass.cpp
index eb695ae97..aeb1354da 100644
--- a/test/std/containers/unord/unord.set/max_size.pass.cpp
+++ b/test/std/containers/unord/unord.set/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_allocator.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
       typedef limited_allocator<int, 10> A;
@@ -47,4 +46,6 @@ int main()
       assert(c.max_size() <= max_dist);
       assert(c.max_size() <= alloc_max_size(c.get_allocator()));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/merge.pass.cpp b/test/std/containers/unord/unord.set/merge.pass.cpp
index 519d7f138..4a11867ed 100644
--- a/test/std/containers/unord/unord.set/merge.pass.cpp
+++ b/test/std/containers/unord/unord.set/merge.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct throw_hasher
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::unordered_set<int> src{1, 3, 5};
@@ -151,4 +150,5 @@ int main()
             first.merge(std::move(second));
         }
     }
+    return 0;
 }
diff --git a/test/std/containers/unord/unord.set/rehash.pass.cpp b/test/std/containers/unord/unord.set/rehash.pass.cpp
index dc3adccc6..e45327ad7 100644
--- a/test/std/containers/unord/unord.set/rehash.pass.cpp
+++ b/test/std/containers/unord/unord.set/rehash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test(const C& c)
     assert(c.count(4) == 1);
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -100,4 +99,6 @@ int main()
         test(c);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/reserve.pass.cpp b/test/std/containers/unord/unord.set/reserve.pass.cpp
index c48a72560..7ea358e88 100644
--- a/test/std/containers/unord/unord.set/reserve.pass.cpp
+++ b/test/std/containers/unord/unord.set/reserve.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void reserve_invariant(size_t n) // LWG #2156
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int> C;
@@ -104,4 +103,6 @@ int main()
     }
 #endif
     reserve_invariant(20);
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/size.pass.cpp b/test/std/containers/unord/unord.set/size.pass.cpp
index c127ddf26..f7967fcd5 100644
--- a/test/std/containers/unord/unord.set/size.pass.cpp
+++ b/test/std/containers/unord/unord.set/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unordered_set<int> M;
@@ -59,4 +58,6 @@ int main()
     assert(m.size() == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/swap_member.pass.cpp b/test/std/containers/unord/unord.set/swap_member.pass.cpp
index 597662112..0877b14f7 100644
--- a/test/std/containers/unord/unord.set/swap_member.pass.cpp
+++ b/test/std/containers/unord/unord.set/swap_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -567,4 +566,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/types.pass.cpp b/test/std/containers/unord/unord.set/types.pass.cpp
index fdda2b807..7b1531dc2 100644
--- a/test/std/containers/unord/unord.set/types.pass.cpp
+++ b/test/std/containers/unord/unord.set/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<short> C;
@@ -66,4 +65,6 @@ int main()
         static_assert((std::is_same<C::difference_type, std::ptrdiff_t>::value), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/allocator.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/allocator.pass.cpp
index 9cd03809d..920244aae 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/allocator.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<NotConstructible,
@@ -107,4 +106,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/assign_copy.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/assign_copy.pass.cpp
index cf473a930..109529542 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/assign_copy.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/assign_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<int> A;
@@ -185,4 +184,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/assign_init.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/assign_init.pass.cpp
index 4e0f68c71..bbb2045cb 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/assign_init.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/assign_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<int> A;
@@ -94,4 +93,6 @@ int main()
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/assign_move.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/assign_move.pass.cpp
index f89c45caf..15741254d 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/assign_move.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_allocator<int> A;
@@ -211,4 +210,6 @@ int main()
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/compare_copy_constructible.fail.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/compare_copy_constructible.fail.cpp
index 411731479..0638027fd 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/compare_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/compare_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_set<int, std::hash<int>, Comp<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/copy.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/copy.pass.cpp
index 06dcc552d..179e6e473 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/copy.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -145,4 +144,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/copy_alloc.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/copy_alloc.pass.cpp
index 538e34960..970da0877 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/copy_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -107,4 +106,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/default.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/default.pass.cpp
index caa4bef02..1fa2932e5 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/default.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<NotConstructible,
@@ -105,4 +104,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/default_noexcept.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/default_noexcept.pass.cpp
index b8d06dbfd..5d6508d46 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/default_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -72,4 +71,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/dtor_noexcept.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/dtor_noexcept.pass.cpp
index 4c10ed2d6..2225469e9 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/dtor_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<MoveOnly> C;
@@ -65,4 +64,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/hash_copy_constructible.fail.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/hash_copy_constructible.fail.cpp
index da368a154..92550a096 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/hash_copy_constructible.fail.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/hash_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ private:
     };
 
 
-int main() {
+int main(int, char**) {
     std::unordered_set<int, Hash<int> > m;
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/init.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/init.pass.cpp
index ff46e08f4..8bf0453c3 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/init.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
   {
         typedef std::unordered_set<int,
@@ -161,4 +160,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size.pass.cpp
index 0ca9b4857..3e58ce928 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -95,4 +94,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash.pass.cpp
index 45ed588a7..3761cc33d 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -98,4 +97,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal.pass.cpp
index 8ace22a58..7123e3415 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -100,4 +99,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal_allocator.pass.cpp
index 4fd50a818..94aa74f24 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -102,4 +101,6 @@ int main()
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
index 0910bf15f..5b599ae71 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -172,4 +171,6 @@ int main()
         assert(s2.size() == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/move_alloc.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/move_alloc.pass.cpp
index bcd10b077..bc6629acd 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/move_alloc.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int P;
@@ -153,4 +152,6 @@ int main()
 
         assert(c0.empty());
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/move_assign_noexcept.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/move_assign_noexcept.pass.cpp
index 670a3484d..dba99837d 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/move_assign_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<MoveOnly> C;
@@ -71,4 +70,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/move_noexcept.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/move_noexcept.pass.cpp
index 43e06bd50..49802f689 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/move_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct some_hash
     std::size_t operator()(T const&) const;
 };
 
-int main()
+int main(int, char**)
 {
 #if defined(_LIBCPP_VERSION)
     {
@@ -68,4 +67,6 @@ int main()
                                                          some_comp<MoveOnly>> C;
         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/range.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/range.pass.cpp
index b6ad0e2a1..dfa46ec56 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/range.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -168,4 +167,6 @@ int main()
 
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size.pass.cpp
index 8900cafc4..1115044e0 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -101,4 +100,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash.pass.cpp
index 315ded7a0..2acbb2d18 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -104,4 +103,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal.pass.cpp
index 3f5c829f7..245e12476 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -106,4 +105,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal_allocator.pass.cpp
index f0d063d2c..002466496 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<int,
@@ -109,4 +108,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/size.fail.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/size.fail.cpp
index b1ee87f8f..da3dc1855 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/size.fail.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/size.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "../../../test_hash.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<NotConstructible,
@@ -43,4 +42,6 @@ int main()
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/size.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/size.pass.cpp
index 5b5e861cd..12ba6201a 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/size.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<NotConstructible,
@@ -63,4 +62,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash.pass.cpp
index 5c77839ff..60134b7fa 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<NotConstructible,
@@ -67,4 +66,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal.pass.cpp
index db49bd0e7..49e12ea29 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<NotConstructible,
@@ -69,4 +68,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal_allocator.pass.cpp b/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal_allocator.pass.cpp
index 3958ce467..43eb1f717 100644
--- a/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal_allocator.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.cnstr/size_hash_equal_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<NotConstructible,
@@ -71,4 +70,6 @@ int main()
         assert(c.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.swap/db_swap_1.pass.cpp b/test/std/containers/unord/unord.set/unord.set.swap/db_swap_1.pass.cpp
index 2e8250ef7..f14f0ddeb 100644
--- a/test/std/containers/unord/unord.set/unord.set.swap/db_swap_1.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.swap/db_swap_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <unordered_set>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if _LIBCPP_DEBUG >= 1
     {
@@ -40,4 +39,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.swap/swap_noexcept.pass.cpp b/test/std/containers/unord/unord.set/unord.set.swap/swap_noexcept.pass.cpp
index 7187f94a2..40bf1894d 100644
--- a/test/std/containers/unord/unord.set/unord.set.swap/swap_noexcept.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.swap/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -119,7 +118,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unordered_set<MoveOnly> C;
@@ -187,4 +186,6 @@ int main()
     }
 #endif // _LIBCPP_VERSION
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/unord/unord.set/unord.set.swap/swap_non_member.pass.cpp b/test/std/containers/unord/unord.set/unord.set.swap/swap_non_member.pass.cpp
index 9ca2f80f0..8f1d9f0c3 100644
--- a/test/std/containers/unord/unord.set/unord.set.swap/swap_non_member.pass.cpp
+++ b/test/std/containers/unord/unord.set/unord.set.swap/swap_non_member.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef test_hash<std::hash<int> > Hash;
@@ -567,4 +566,6 @@ int main()
         assert(c2.max_load_factor() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/array.fail.cpp b/test/std/containers/views/span.cons/array.fail.cpp
index e1e5deea5..f61649771 100644
--- a/test/std/containers/views/span.cons/array.fail.cpp
+++ b/test/std/containers/views/span.cons/array.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -35,7 +34,7 @@ const          int  carr[] = {4,5,6};
       volatile int  varr[] = {7,8,9};
 const volatile int cvarr[] = {1,3,5};
 
-int main ()
+int main(int, char**)
 {
 //  Size wrong
     {
@@ -69,4 +68,6 @@ int main ()
     std::span<      volatile int,3> s6{ carr};  // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
     std::span<      volatile int,3> s7{cvarr};  // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/array.pass.cpp b/test/std/containers/views/span.cons/array.pass.cpp
index 72a86654e..5ac7e1a4a 100644
--- a/test/std/containers/views/span.cons/array.pass.cpp
+++ b/test/std/containers/views/span.cons/array.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -106,7 +105,7 @@ void testRuntimeSpan()
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan<int>(),    "");
     static_assert(testConstexprSpan<long>(),   "");
@@ -120,4 +119,6 @@ int main ()
     testRuntimeSpan<A>();
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/assign.pass.cpp b/test/std/containers/views/span.cons/assign.pass.cpp
index cb2100461..3f8d5f418 100644
--- a/test/std/containers/views/span.cons/assign.pass.cpp
+++ b/test/std/containers/views/span.cons/assign.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -38,7 +37,7 @@ constexpr int carr3[] = {7,8};
 std::string strs[] = {"ABC", "DEF", "GHI"};
 
 
-int main ()
+int main(int, char**)
 {
 
 //  constexpr dynamically sized assignment
@@ -290,4 +289,6 @@ int main ()
             for (size_t j = i; j < std::size(spans); ++j)
                 assert((doAssign(spans[i], spans[j])));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/container.fail.cpp b/test/std/containers/views/span.cons/container.fail.cpp
index c8f6830fb..d0fb5656d 100644
--- a/test/std/containers/views/span.cons/container.fail.cpp
+++ b/test/std/containers/views/span.cons/container.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,9 +26,10 @@
 
 #include <span>
 #include <cassert>
-#include <list>
-#include <forward_list>
 #include <deque>
+#include <forward_list>
+#include <list>
+#include <vector>
 
 #include "test_macros.h"
 
@@ -63,55 +63,72 @@ private:
 };
 
 
-int main ()
+int main(int, char**)
 {
 
-//  Missing size and/or data
+//  Making non-const spans from const sources (a temporary binds to `const &`)
     {
     std::span<int>    s1{IsAContainer<int>()};          // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s2{IsAContainer<int>()};          // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
-    std::span<int>    s3{NotAContainerNoData<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s4{NotAContainerNoData<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
-    std::span<int>    s5{NotAContainerNoSize<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s6{NotAContainerNoSize<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
-    std::span<int>    s7{NotAContainerPrivate<int>()};  // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s8{NotAContainerPrivate<int>()};  // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+    std::span<int, 0> s2{IsAContainer<int>()};          // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}} 
+    std::span<int>    s3{std::vector<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<int, 0> s4{std::vector<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}} 
+    }
+
+//  Missing size and/or data
+    {
+    std::span<const int>    s1{NotAContainerNoData<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const int, 0> s2{NotAContainerNoData<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+    std::span<const int>    s3{NotAContainerNoSize<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const int, 0> s4{NotAContainerNoSize<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+    std::span<const int>    s5{NotAContainerPrivate<int>()};  // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const int, 0> s6{NotAContainerPrivate<int>()};  // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
 
 //  Again with the standard containers
-    std::span<int>    s11{std::deque<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s12{std::deque<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
-    std::span<int>    s13{std::list<int>()};            // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s14{std::list<int>()};            // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
-    std::span<int>    s15{std::forward_list<int>()};    // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s16{std::forward_list<int>()};    // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
+    std::span<const int>    s11{std::deque<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const int, 0> s12{std::deque<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+    std::span<const int>    s13{std::list<int>()};            // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const int, 0> s14{std::list<int>()};            // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
+    std::span<const int>    s15{std::forward_list<int>()};    // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const int, 0> s16{std::forward_list<int>()};    // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
     }
 
 //  Not the same type
     {
-    std::span<float>    s1{IsAContainer<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
-    std::span<float, 0> s2{IsAContainer<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
+    IsAContainer<int> c;
+    std::span<float>    s1{c};   // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
+    std::span<float, 0> s2{c};   // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
     }
 
 //  CV wrong (dynamically sized)
     {
-    std::span<               int> s1{IsAContainer<const          int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<               int> s2{IsAContainer<      volatile int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<               int> s3{IsAContainer<const volatile int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<const          int> s4{IsAContainer<      volatile int>()};   // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
-    std::span<const          int> s5{IsAContainer<const volatile int>()};   // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
-    std::span<      volatile int> s6{IsAContainer<const          int>()};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
-    std::span<      volatile int> s7{IsAContainer<const volatile int>()};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
+    IsAContainer<const          int> c;
+    IsAContainer<const volatile int> cv;
+    IsAContainer<      volatile int> v;
+    
+    std::span<               int> s1{c};    // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<               int> s2{v};    // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<               int> s3{cv};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
+    std::span<const          int> s4{v};    // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<const          int> s5{cv};   // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
+    std::span<      volatile int> s6{c};    // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
+    std::span<      volatile int> s7{cv};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
     }
 
 //  CV wrong (statically sized)
     {
-    std::span<               int,1> s1{IsAContainer<const          int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
-    std::span<               int,1> s2{IsAContainer<      volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
-    std::span<               int,1> s3{IsAContainer<const volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
-    std::span<const          int,1> s4{IsAContainer<      volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 1>'}}
-    std::span<const          int,1> s5{IsAContainer<const volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 1>'}}
-    std::span<      volatile int,1> s6{IsAContainer<const          int>()}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 1>'}}
-    std::span<      volatile int,1> s7{IsAContainer<const volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 1>'}}
+    IsAContainer<const          int> c;
+    IsAContainer<const volatile int> cv;
+    IsAContainer<      volatile int> v;
+
+    std::span<               int,1> s1{c};  // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
+    std::span<               int,1> s2{v};  // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
+    std::span<               int,1> s3{cv}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
+    std::span<const          int,1> s4{v};  // expected-error {{no matching constructor for initialization of 'std::span<const int, 1>'}}
+    std::span<const          int,1> s5{cv}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 1>'}}
+    std::span<      volatile int,1> s6{c};  // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 1>'}}
+    std::span<      volatile int,1> s7{cv}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 1>'}}
     }
 
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/container.pass.cpp b/test/std/containers/views/span.cons/container.pass.cpp
index 401f41e07..07aac9229 100644
--- a/test/std/containers/views/span.cons/container.pass.cpp
+++ b/test/std/containers/views/span.cons/container.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -74,6 +73,18 @@ void checkCV()
     std::span<      volatile int,3> s3{v};  // a span<      volatile int> pointing at const int.
     std::span<const volatile int,3> s4{v};  // a span<const volatile int> pointing at int.
     }
+
+//  Constructing a const view from a temporary
+    {
+    std::span<const int>    s1{IsAContainer<int>()};
+    std::span<const int, 0> s2{IsAContainer<int>()};
+    std::span<const int>    s3{std::vector<int>()};
+    std::span<const int, 0> s4{std::vector<int>()};
+    (void) s1;
+    (void) s2;
+    (void) s3;
+    (void) s4;
+    }
 }
 
 
@@ -93,15 +104,20 @@ template <typename T>
 void testRuntimeSpan()
 {
     IsAContainer<T> val{};
-    std::span<const T>    s1{val};
-    std::span<const T, 1> s2{val};
-    assert(s1.data() == val.getV() && s1.size() == 1);
-    assert(s2.data() == val.getV() && s2.size() == 1);
+    const IsAContainer<T> cVal;
+    std::span<T>          s1{val};
+    std::span<const T>    s2{cVal};
+    std::span<T, 1>       s3{val};
+    std::span<const T, 1> s4{cVal};
+    assert(s1.data() == val.getV()  && s1.size() == 1);
+    assert(s2.data() == cVal.getV() && s2.size() == 1);
+    assert(s3.data() == val.getV()  && s3.size() == 1);
+    assert(s4.data() == cVal.getV() && s4.size() == 1);
 }
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan<int>(),    "");
     static_assert(testConstexprSpan<long>(),   "");
@@ -115,4 +131,6 @@ int main ()
     testRuntimeSpan<A>();
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/copy.pass.cpp b/test/std/containers/views/span.cons/copy.pass.cpp
index c123acb6a..2ad1cded2 100644
--- a/test/std/containers/views/span.cons/copy.pass.cpp
+++ b/test/std/containers/views/span.cons/copy.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -43,7 +42,7 @@ void testCV ()
 }
 
 
-int main ()
+int main(int, char**)
 {
     constexpr int carr[] = {1,2,3};
 
@@ -68,4 +67,6 @@ int main ()
     testCV<const          int>();
     testCV<      volatile int>();
     testCV<const volatile int>();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/deduct.pass.cpp b/test/std/containers/views/span.cons/deduct.pass.cpp
index 098215c83..188463bc3 100644
--- a/test/std/containers/views/span.cons/deduct.pass.cpp
+++ b/test/std/containers/views/span.cons/deduct.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -41,7 +40,7 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
-int main ()
+int main(int, char**)
 {
     {
     int arr[] = {1,2,3};
@@ -84,4 +83,6 @@ int main ()
     assert((size_t)s.size() == str.size());
     assert((std::equal(s.begin(), s.end(), std::begin(s), std::end(s))));
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/default.fail.cpp b/test/std/containers/views/span.cons/default.fail.cpp
index 813939f39..24ff77477 100644
--- a/test/std/containers/views/span.cons/default.fail.cpp
+++ b/test/std/containers/views/span.cons/default.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -23,10 +22,12 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::span<int, 2> s; // expected-error-re@span:* {{static_assert failed{{( due to requirement '2[LL]{0,2} == 0')?}} "Can't default construct a statically sized span with size > 0"}}
 
 //  TODO: This is what I want:
 // eXpected-error {{no matching constructor for initialization of 'std::span<int, 2>'}}
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/default.pass.cpp b/test/std/containers/views/span.cons/default.pass.cpp
index b7d01c9e2..867026bd9 100644
--- a/test/std/containers/views/span.cons/default.pass.cpp
+++ b/test/std/containers/views/span.cons/default.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -65,7 +64,7 @@ void testRuntimeSpan()
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan<int>(),    "");
     static_assert(testConstexprSpan<long>(),   "");
@@ -79,4 +78,6 @@ int main ()
     testRuntimeSpan<A>();
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/ptr_len.fail.cpp b/test/std/containers/views/span.cons/ptr_len.fail.cpp
index 9ab87f541..d407ae779 100644
--- a/test/std/containers/views/span.cons/ptr_len.fail.cpp
+++ b/test/std/containers/views/span.cons/ptr_len.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -28,7 +27,7 @@ const          int  carr[] = {4,5,6};
       volatile int  varr[] = {7,8,9};
 const volatile int cvarr[] = {1,3,5};
 
-int main ()
+int main(int, char**)
 {
 //  We can't check that the size doesn't match - because that's a runtime property
 //  std::span<int, 2>   s1(arr, 3);
@@ -60,4 +59,6 @@ int main ()
     std::span<      volatile int,3> s6{ carr, 3};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
     std::span<      volatile int,3> s7{cvarr, 3};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/ptr_len.pass.cpp b/test/std/containers/views/span.cons/ptr_len.pass.cpp
index c4e9545e9..2a4b260c8 100644
--- a/test/std/containers/views/span.cons/ptr_len.pass.cpp
+++ b/test/std/containers/views/span.cons/ptr_len.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -96,7 +95,7 @@ void testRuntimeSpan()
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan<int>(),    "");
     static_assert(testConstexprSpan<long>(),   "");
@@ -110,4 +109,6 @@ int main ()
     testRuntimeSpan<A>();
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/ptr_ptr.fail.cpp b/test/std/containers/views/span.cons/ptr_ptr.fail.cpp
index bd4dbab8f..9c15ea58c 100644
--- a/test/std/containers/views/span.cons/ptr_ptr.fail.cpp
+++ b/test/std/containers/views/span.cons/ptr_ptr.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -28,7 +27,7 @@ const          int  carr[] = {4,5,6};
       volatile int  varr[] = {7,8,9};
 const volatile int cvarr[] = {1,3,5};
 
-int main ()
+int main(int, char**)
 {
 //  We can't check that the size doesn't match - because that's a runtime property
 //  std::span<int, 2>   s1(arr, arr + 3);
@@ -60,4 +59,6 @@ int main ()
     std::span<      volatile int,3> s6{ carr,  carr + 3};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
     std::span<      volatile int,3> s7{cvarr, cvarr + 3};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/ptr_ptr.pass.cpp b/test/std/containers/views/span.cons/ptr_ptr.pass.cpp
index c2bceec48..15c9f303e 100644
--- a/test/std/containers/views/span.cons/ptr_ptr.pass.cpp
+++ b/test/std/containers/views/span.cons/ptr_ptr.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -96,7 +95,7 @@ void testRuntimeSpan()
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan<int>(),    "");
     static_assert(testConstexprSpan<long>(),   "");
@@ -110,4 +109,6 @@ int main ()
     testRuntimeSpan<A>();
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/span.fail.cpp b/test/std/containers/views/span.cons/span.fail.cpp
index 69e879e2e..f559b1fb0 100644
--- a/test/std/containers/views/span.cons/span.fail.cpp
+++ b/test/std/containers/views/span.cons/span.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -90,7 +89,7 @@ void checkCV ()
     }
 }
 
-int main ()
+int main(int, char**)
 {
     std::span<int>      sp;
     std::span<int, 0>   sp0;
@@ -101,4 +100,6 @@ int main ()
     std::span<float, 0> s4{sp0};    // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/span.pass.cpp b/test/std/containers/views/span.cons/span.pass.cpp
index 5fdbab227..74da3fce8 100644
--- a/test/std/containers/views/span.cons/span.pass.cpp
+++ b/test/std/containers/views/span.cons/span.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -122,7 +121,7 @@ bool testConversionSpan()
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan<int>(),    "");
     static_assert(testConstexprSpan<long>(),   "");
@@ -139,4 +138,6 @@ int main ()
 //  assert((testConversionSpan<unsigned char, char>()));
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.cons/stdarray.pass.cpp b/test/std/containers/views/span.cons/stdarray.pass.cpp
index 27623a4c9..03fdd2534 100644
--- a/test/std/containers/views/span.cons/stdarray.pass.cpp
+++ b/test/std/containers/views/span.cons/stdarray.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -97,7 +96,7 @@ void testRuntimeSpan()
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan<int>(),    "");
     static_assert(testConstexprSpan<long>(),   "");
@@ -111,4 +110,6 @@ int main ()
     testRuntimeSpan<A>();
 
     checkCV();
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.elem/data.pass.cpp b/test/std/containers/views/span.elem/data.pass.cpp
index ceb2eca17..c858a7e11 100644
--- a/test/std/containers/views/span.elem/data.pass.cpp
+++ b/test/std/containers/views/span.elem/data.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -41,7 +40,7 @@ struct A{};
 constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
-int main ()
+int main(int, char**)
 {
 
 //  dynamic size
@@ -118,4 +117,6 @@ int main ()
     testRuntimeSpan(std::span<std::string>(&s, 1), &s);
     testRuntimeSpan(std::span<std::string, 1>(&s, 1), &s);
 
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.elem/op_idx.pass.cpp b/test/std/containers/views/span.elem/op_idx.pass.cpp
index 801eca428..c56be7d3e 100644
--- a/test/std/containers/views/span.elem/op_idx.pass.cpp
+++ b/test/std/containers/views/span.elem/op_idx.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -52,7 +51,7 @@ struct A{};
 constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), 0), "");
 
@@ -116,4 +115,6 @@ int main ()
     std::string s;
     testRuntimeSpan(std::span<std::string>   (&s, 1), 0);
     testRuntimeSpan(std::span<std::string, 1>(&s, 1), 0);
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.iterators/begin.pass.cpp b/test/std/containers/views/span.iterators/begin.pass.cpp
index cd8d70958..e4532ade5 100644
--- a/test/std/containers/views/span.iterators/begin.pass.cpp
+++ b/test/std/containers/views/span.iterators/begin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -71,7 +70,7 @@ constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
 
-int main()
+int main(int, char**)
 {
     static_assert(testConstexprSpan(std::span<int>()),            "");
     static_assert(testConstexprSpan(std::span<long>()),           "");
@@ -113,4 +112,6 @@ int main()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0));
     testRuntimeSpan(std::span<std::string>(&s, 1));
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.iterators/end.pass.cpp b/test/std/containers/views/span.iterators/end.pass.cpp
index 54ff8ebf7..c52c8bc60 100644
--- a/test/std/containers/views/span.iterators/end.pass.cpp
+++ b/test/std/containers/views/span.iterators/end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -79,7 +78,7 @@ constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
 
-int main()
+int main(int, char**)
 {
     static_assert(testConstexprSpan(std::span<int>()),            "");
     static_assert(testConstexprSpan(std::span<long>()),           "");
@@ -121,4 +120,6 @@ int main()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0));
     testRuntimeSpan(std::span<std::string>(&s, 1));
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.iterators/rbegin.pass.cpp b/test/std/containers/views/span.iterators/rbegin.pass.cpp
index 258908d6c..fc7d3c8e0 100644
--- a/test/std/containers/views/span.iterators/rbegin.pass.cpp
+++ b/test/std/containers/views/span.iterators/rbegin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -72,7 +71,7 @@ constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
 
-int main()
+int main(int, char**)
 {
     static_assert(testConstexprSpan(std::span<int>()),            "");
     static_assert(testConstexprSpan(std::span<long>()),           "");
@@ -114,4 +113,6 @@ int main()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, static_cast<std::ptrdiff_t>(0)));
     testRuntimeSpan(std::span<std::string>(&s, 1));
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.iterators/rend.pass.cpp b/test/std/containers/views/span.iterators/rend.pass.cpp
index 367ea8866..056fe2a7d 100644
--- a/test/std/containers/views/span.iterators/rend.pass.cpp
+++ b/test/std/containers/views/span.iterators/rend.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -73,7 +72,7 @@ constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
 
-int main()
+int main(int, char**)
 {
     static_assert(testConstexprSpan(std::span<int>()),            "");
     static_assert(testConstexprSpan(std::span<long>()),           "");
@@ -115,4 +114,6 @@ int main()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0));
     testRuntimeSpan(std::span<std::string>(&s, 1));
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.objectrep/as_bytes.pass.cpp b/test/std/containers/views/span.objectrep/as_bytes.pass.cpp
index e4a240f8d..3e6a7d79f 100644
--- a/test/std/containers/views/span.objectrep/as_bytes.pass.cpp
+++ b/test/std/containers/views/span.objectrep/as_bytes.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -46,7 +45,7 @@ void testRuntimeSpan(Span sp)
 struct A{};
 int iArr2[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
 
-int main ()
+int main(int, char**)
 {
     testRuntimeSpan(std::span<int>        ());
     testRuntimeSpan(std::span<long>       ());
@@ -75,4 +74,6 @@ int main ()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0));
     testRuntimeSpan(std::span<std::string>(&s, 1));
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.objectrep/as_writeable_bytes.fail.cpp b/test/std/containers/views/span.objectrep/as_writeable_bytes.fail.cpp
index 63d79c923..b987edb30 100644
--- a/test/std/containers/views/span.objectrep/as_writeable_bytes.fail.cpp
+++ b/test/std/containers/views/span.objectrep/as_writeable_bytes.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -29,7 +28,7 @@ const int iArr2[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
 
 struct A {};
 
-int main ()
+int main(int, char**)
 {
     std::as_writeable_bytes(std::span<const int>());            // expected-error {{no matching function for call to 'as_writeable_bytes'}}
     std::as_writeable_bytes(std::span<const long>());           // expected-error {{no matching function for call to 'as_writeable_bytes'}}
@@ -45,4 +44,6 @@ int main ()
 
     std::as_writeable_bytes(std::span<const int>   (iArr2, 1));     // expected-error {{no matching function for call to 'as_writeable_bytes'}}
     std::as_writeable_bytes(std::span<const int, 1>(iArr2 + 5, 1)); // expected-error {{no matching function for call to 'as_writeable_bytes'}}
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.objectrep/as_writeable_bytes.pass.cpp b/test/std/containers/views/span.objectrep/as_writeable_bytes.pass.cpp
index 54216c297..96bb40ec4 100644
--- a/test/std/containers/views/span.objectrep/as_writeable_bytes.pass.cpp
+++ b/test/std/containers/views/span.objectrep/as_writeable_bytes.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -46,7 +45,7 @@ void testRuntimeSpan(Span sp)
 struct A{};
 int iArr2[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
 
-int main ()
+int main(int, char**)
 {
     testRuntimeSpan(std::span<int>        ());
     testRuntimeSpan(std::span<long>       ());
@@ -75,4 +74,6 @@ int main ()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0));
     testRuntimeSpan(std::span<std::string>(&s, 1));
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.obs/empty.pass.cpp b/test/std/containers/views/span.obs/empty.pass.cpp
index 23e55bb76..9db8c8ab7 100644
--- a/test/std/containers/views/span.obs/empty.pass.cpp
+++ b/test/std/containers/views/span.obs/empty.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,7 +24,7 @@ struct A{};
 constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
-int main ()
+int main(int, char**)
 {
     static_assert( noexcept(std::span<int>   ().empty()), "");
     static_assert( noexcept(std::span<int, 0>().empty()), "");
@@ -70,4 +69,6 @@ int main ()
     std::string s;
     assert( ((std::span<std::string>(&s, (std::ptrdiff_t) 0)).empty()));
     assert(!((std::span<std::string>(&s, 1).empty())));
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.obs/size.pass.cpp b/test/std/containers/views/span.obs/size.pass.cpp
index 16f1b6a7e..f1dbc1fd9 100644
--- a/test/std/containers/views/span.obs/size.pass.cpp
+++ b/test/std/containers/views/span.obs/size.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -41,7 +40,7 @@ struct A{};
 constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan(std::span<int>(), 0),            "");
     static_assert(testConstexprSpan(std::span<long>(), 0),           "");
@@ -88,4 +87,6 @@ int main ()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0), 0);
     testRuntimeSpan(std::span<std::string>(&s, 1), 1);
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.obs/size_bytes.pass.cpp b/test/std/containers/views/span.obs/size_bytes.pass.cpp
index 3b6c5b0e2..1d423527c 100644
--- a/test/std/containers/views/span.obs/size_bytes.pass.cpp
+++ b/test/std/containers/views/span.obs/size_bytes.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -42,7 +41,7 @@ struct A{};
 constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
           int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
 
-int main ()
+int main(int, char**)
 {
     static_assert(testConstexprSpan(std::span<int>(), 0),            "");
     static_assert(testConstexprSpan(std::span<long>(), 0),           "");
@@ -89,4 +88,6 @@ int main ()
     std::string s;
     testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0), 0);
     testRuntimeSpan(std::span<std::string>(&s, 1), 1);
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.sub/first.pass.cpp b/test/std/containers/views/span.sub/first.pass.cpp
index e745fd77d..f9da9fdc2 100644
--- a/test/std/containers/views/span.sub/first.pass.cpp
+++ b/test/std/containers/views/span.sub/first.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -69,7 +68,7 @@ constexpr int carr1[] = {1,2,3,4};
           int   arr[] = {5,6,7};
 std::string   sarr [] = { "ABC", "DEF", "GHI", "JKL", "MNO"};
 
-int main ()
+int main(int, char**)
 {
     {
     using Sp = std::span<const int>;
@@ -133,4 +132,6 @@ int main ()
     testRuntimeSpan<Sp, 4>(Sp{sarr});
     testRuntimeSpan<Sp, 5>(Sp{sarr});
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.sub/last.pass.cpp b/test/std/containers/views/span.sub/last.pass.cpp
index 94d41430b..e0a399ff9 100644
--- a/test/std/containers/views/span.sub/last.pass.cpp
+++ b/test/std/containers/views/span.sub/last.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -69,7 +68,7 @@ constexpr int carr1[] = {1,2,3,4};
           int   arr[] = {5,6,7};
 std::string   sarr [] = { "ABC", "DEF", "GHI", "JKL", "MNO"};
 
-int main ()
+int main(int, char**)
 {
     {
     using Sp = std::span<const int>;
@@ -133,4 +132,6 @@ int main ()
     testRuntimeSpan<Sp, 4>(Sp{sarr});
     testRuntimeSpan<Sp, 5>(Sp{sarr});
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/span.sub/subspan.pass.cpp b/test/std/containers/views/span.sub/subspan.pass.cpp
index 012fc2b5f..9cb731093 100644
--- a/test/std/containers/views/span.sub/subspan.pass.cpp
+++ b/test/std/containers/views/span.sub/subspan.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -107,7 +106,7 @@ void testRuntimeSpan(Span sp)
 constexpr int carr1[] = {1,2,3,4};
           int  arr1[] = {5,6,7};
 
-int main ()
+int main(int, char**)
 {
     {
     using Sp = std::span<const int>;
@@ -207,4 +206,6 @@ int main ()
     testRuntimeSpan<Sp, 2>(Sp{arr1});
     testRuntimeSpan<Sp, 3>(Sp{arr1});
     }
+
+  return 0;
 }
diff --git a/test/std/containers/views/types.pass.cpp b/test/std/containers/views/types.pass.cpp
index c519fbf76..ac6f47fa8 100644
--- a/test/std/containers/views/types.pass.cpp
+++ b/test/std/containers/views/types.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===------------------------------ span ---------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===---------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -97,11 +96,13 @@ void test()
 
 struct A{};
 
-int main ()
+int main(int, char**)
 {
     test<int>();
     test<long>();
     test<double>();
     test<std::string>();
     test<A>();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/A.h b/test/std/depr/depr.auto.ptr/auto.ptr/A.h
index cc16abe06..102624dfe 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/A.h
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/A.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/AB.h b/test/std/depr/depr.auto.ptr/auto.ptr/AB.h
index b7ec9882a..6e270b49f 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/AB.h
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/AB.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.fail.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.fail.cpp
index 88f0904ab..2fa102e27 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.fail.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.pass.cpp
index a5d52a6ef..31eb1f67d 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.fail.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.fail.cpp
index d5f38c1e2..2a7fe6640 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.fail.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ test()
     assert(B::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.pass.cpp
index cce3c79ef..3d574de34 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,9 @@ test()
     assert(B::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.fail.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.fail.cpp
index be95d2c19..23f6a1999 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.fail.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,9 @@ test()
     assert(B::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.pass.cpp
index b83c266fb..dc363c1e9 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/convert_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,9 @@ test()
     assert(B::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.fail.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.fail.cpp
index 78423e518..3684da493 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.fail.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.pass.cpp
index 10a432647..0e674f21a 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/explicit.fail.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/explicit.fail.cpp
index 54eb162f0..e91abaf5a 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/explicit.fail.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/explicit.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/pointer.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/pointer.pass.cpp
index 3dfd200fa..7423c3b73 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/pointer.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.cons/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,9 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/assign_from_auto_ptr_ref.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/assign_from_auto_ptr_ref.pass.cpp
index 91801efac..0486e02fb 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/assign_from_auto_ptr_ref.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/assign_from_auto_ptr_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_from_auto_ptr_ref.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_from_auto_ptr_ref.pass.cpp
index e08df6437..7dd37f760 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_from_auto_ptr_ref.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_from_auto_ptr_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,9 @@ test()
     assert(B::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr.pass.cpp
index 572e5e686..809f6b37e 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,9 @@ test()
     std::auto_ptr<A> ap2(source());
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr_ref.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr_ref.pass.cpp
index cd9fed2fb..a75f13492 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr_ref.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.conv/convert_to_auto_ptr_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,9 @@ test()
     delete p1;
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/arrow.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/arrow.pass.cpp
index 305cf025c..7878f50f7 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/arrow.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/deref.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/deref.pass.cpp
index 7174b27fb..1e41c8a9d 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/deref.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/deref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/release.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/release.pass.cpp
index 650da2ef8..61b6bbcc6 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/release.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/release.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/reset.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/reset.pass.cpp
index 55772b688..d2ebd5668 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/reset.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/auto.ptr.members/reset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,9 @@ test()
     assert(A::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/auto.ptr/element_type.pass.cpp b/test/std/depr/depr.auto.ptr/auto.ptr/element_type.pass.cpp
index 1895828af..a4dac7615 100644
--- a/test/std/depr/depr.auto.ptr/auto.ptr/element_type.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/auto.ptr/element_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,9 +30,11 @@ test()
     ((void)p);
 }
 
-int main()
+int main(int, char**)
 {
     test<int>();
     test<double>();
     test<void>();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.auto.ptr/nothing_to_do.pass.cpp b/test/std/depr/depr.auto.ptr/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/depr/depr.auto.ptr/nothing_to_do.pass.cpp
+++ b/test/std/depr/depr.auto.ptr/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/assert_h.pass.cpp b/test/std/depr/depr.c.headers/assert_h.pass.cpp
index 39a73467d..d680f33ef 100644
--- a/test/std/depr/depr.c.headers/assert_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/assert_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error assert not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/ciso646.pass.cpp b/test/std/depr/depr.c.headers/ciso646.pass.cpp
index 6a686dc0c..3eb4064e6 100644
--- a/test/std/depr/depr.c.headers/ciso646.pass.cpp
+++ b/test/std/depr/depr.c.headers/ciso646.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,6 +10,8 @@
 
 #include <ciso646>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/complex.h.pass.cpp b/test/std/depr/depr.c.headers/complex.h.pass.cpp
index 4effd9653..d92ddb67b 100644
--- a/test/std/depr/depr.c.headers/complex.h.pass.cpp
+++ b/test/std/depr/depr.c.headers/complex.h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,8 +10,10 @@
 
 #include <complex.h>
 
-int main()
+int main(int, char**)
 {
     std::complex<double> d;
     (void)d;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/ctype_h.pass.cpp b/test/std/depr/depr.c.headers/ctype_h.pass.cpp
index 042084e98..61b539d40 100644
--- a/test/std/depr/depr.c.headers/ctype_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/ctype_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,7 +68,7 @@
 #error toupper defined
 #endif
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<decltype(isalnum(0)), int>::value), "");
     static_assert((std::is_same<decltype(isalpha(0)), int>::value), "");
@@ -100,4 +99,6 @@ int main()
     assert(isxdigit('a'));
     assert(tolower('A') == 'a');
     assert(toupper('a') == 'A');
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/errno_h.pass.cpp b/test/std/depr/depr.c.headers/errno_h.pass.cpp
index 4d955a5b4..985cdc7f5 100644
--- a/test/std/depr/depr.c.headers/errno_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/errno_h.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,6 +27,8 @@
 #error errno not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/fenv_h.pass.cpp b/test/std/depr/depr.c.headers/fenv_h.pass.cpp
index 0da4c9d86..6b38f4e6c 100644
--- a/test/std/depr/depr.c.headers/fenv_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/fenv_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -58,19 +57,21 @@
 #error FE_DFL_ENV not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     fenv_t fenv = {};
     fexcept_t fex = 0;
-    static_assert((std::is_same<decltype(feclearexcept(0)), int>::value), "");
-    static_assert((std::is_same<decltype(fegetexceptflag(&fex, 0)), int>::value), "");
-    static_assert((std::is_same<decltype(feraiseexcept(0)), int>::value), "");
-    static_assert((std::is_same<decltype(fesetexceptflag(&fex, 0)), int>::value), "");
-    static_assert((std::is_same<decltype(fetestexcept(0)), int>::value), "");
-    static_assert((std::is_same<decltype(fegetround()), int>::value), "");
-    static_assert((std::is_same<decltype(fesetround(0)), int>::value), "");
-    static_assert((std::is_same<decltype(fegetenv(&fenv)), int>::value), "");
-    static_assert((std::is_same<decltype(feholdexcept(&fenv)), int>::value), "");
-    static_assert((std::is_same<decltype(fesetenv(&fenv)), int>::value), "");
-    static_assert((std::is_same<decltype(feupdateenv(&fenv)), int>::value), "");
+    static_assert((std::is_same<decltype(::feclearexcept(0)), int>::value), "");
+    static_assert((std::is_same<decltype(::fegetexceptflag(&fex, 0)), int>::value), "");
+    static_assert((std::is_same<decltype(::feraiseexcept(0)), int>::value), "");
+    static_assert((std::is_same<decltype(::fesetexceptflag(&fex, 0)), int>::value), "");
+    static_assert((std::is_same<decltype(::fetestexcept(0)), int>::value), "");
+    static_assert((std::is_same<decltype(::fegetround()), int>::value), "");
+    static_assert((std::is_same<decltype(::fesetround(0)), int>::value), "");
+    static_assert((std::is_same<decltype(::fegetenv(&fenv)), int>::value), "");
+    static_assert((std::is_same<decltype(::feholdexcept(&fenv)), int>::value), "");
+    static_assert((std::is_same<decltype(::fesetenv(&fenv)), int>::value), "");
+    static_assert((std::is_same<decltype(::feupdateenv(&fenv)), int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/float_h.pass.cpp b/test/std/depr/depr.c.headers/float_h.pass.cpp
index 84e89c4db..779fbc66f 100644
--- a/test/std/depr/depr.c.headers/float_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/float_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -179,6 +178,8 @@
 #endif
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/inttypes_h.pass.cpp b/test/std/depr/depr.c.headers/inttypes_h.pass.cpp
index 5b0bb3bff..a08873311 100644
--- a/test/std/depr/depr.c.headers/inttypes_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/inttypes_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -878,7 +877,7 @@ template <class T> void test()
     ((void)t); // Prevent unused warning
 }
 
-int main()
+int main(int, char**)
 {
     test<int8_t >();
     test<int16_t>();
@@ -928,4 +927,6 @@ int main()
     static_assert((std::is_same<decltype(strtoumax("", (char**)0, 0)), uintmax_t>::value), "");
     static_assert((std::is_same<decltype(wcstoimax(L"", (wchar_t**)0, 0)), intmax_t>::value), "");
     static_assert((std::is_same<decltype(wcstoumax(L"", (wchar_t**)0, 0)), uintmax_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/iso646_h.pass.cpp b/test/std/depr/depr.c.headers/iso646_h.pass.cpp
index b40a4e06c..77ca12627 100644
--- a/test/std/depr/depr.c.headers/iso646_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/iso646_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 
 #include <iso646.h>
 
-int main()
+int main(int, char**)
 {
     // Nothing to test
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/limits_h.pass.cpp b/test/std/depr/depr.c.headers/limits_h.pass.cpp
index 3b78a835d..5dba10edf 100644
--- a/test/std/depr/depr.c.headers/limits_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/limits_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -87,6 +86,8 @@
 #error ULLONG_MAX not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/locale_h.pass.cpp b/test/std/depr/depr.c.headers/locale_h.pass.cpp
index f5735b6ea..fd2419bb7 100644
--- a/test/std/depr/depr.c.headers/locale_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/locale_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,9 +39,11 @@
 #error NULL not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     lconv lc; ((void)lc);
     static_assert((std::is_same<decltype(setlocale(0, "")), char*>::value), "");
     static_assert((std::is_same<decltype(localeconv()), lconv*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/math_h.pass.cpp b/test/std/depr/depr.c.headers/math_h.pass.cpp
index e8341a07f..b0b6c0cb3 100644
--- a/test/std/depr/depr.c.headers/math_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/math_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1464,7 +1463,7 @@ void test_trunc()
     assert(trunc(1) == 1);
 }
 
-int main()
+int main(int, char**)
 {
     test_abs();
     test_acos();
@@ -1536,4 +1535,6 @@ int main()
     test_scalbn();
     test_tgamma();
     test_trunc();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/setjmp_h.pass.cpp b/test/std/depr/depr.c.headers/setjmp_h.pass.cpp
index 9663d8892..1878f4f84 100644
--- a/test/std/depr/depr.c.headers/setjmp_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/setjmp_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #error setjmp not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     jmp_buf jb;
     ((void)jb); // Prevent unused warning
     static_assert((std::is_same<decltype(longjmp(jb, 0)), void>::value),
                   "std::is_same<decltype(longjmp(jb, 0)), void>::value");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/signal_h.pass.cpp b/test/std/depr/depr.c.headers/signal_h.pass.cpp
index 83f45c9b1..463d670ba 100644
--- a/test/std/depr/depr.c.headers/signal_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/signal_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,10 +47,12 @@
 #error SIGTERM not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     sig_atomic_t sig; ((void)sig);
     typedef void (*func)(int);
     static_assert((std::is_same<decltype(signal(0, (func)0)), func>::value), "");
     static_assert((std::is_same<decltype(raise(0)), int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/stdarg_h.pass.cpp b/test/std/depr/depr.c.headers/stdarg_h.pass.cpp
index e3c38801e..feb9c4a46 100644
--- a/test/std/depr/depr.c.headers/stdarg_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/stdarg_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,8 +30,10 @@
 #error va_start not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     va_list va;
     ((void)va);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/stdbool_h.pass.cpp b/test/std/depr/depr.c.headers/stdbool_h.pass.cpp
index cd4d4c4b2..132ad9c5c 100644
--- a/test/std/depr/depr.c.headers/stdbool_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/stdbool_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@
 #error false should not be defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/stddef_h.pass.cpp b/test/std/depr/depr.c.headers/stddef_h.pass.cpp
index 68f70b80e..c54c976ee 100644
--- a/test/std/depr/depr.c.headers/stddef_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/stddef_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #error offsetof not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     void *p = NULL;
     assert(!p);
@@ -66,4 +65,6 @@ int main()
                   std::alignment_of<void*>::value,
                   "std::alignment_of<max_align_t>::value >= "
                   "std::alignment_of<void*>::value");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/stdint_h.pass.cpp b/test/std/depr/depr.c.headers/stdint_h.pass.cpp
index 3d49111fd..68efe7992 100644
--- a/test/std/depr/depr.c.headers/stdint_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/stdint_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     // typedef int8_t
     static_assert(sizeof(int8_t)*CHAR_BIT == 8,
@@ -288,4 +287,6 @@ int main()
 #ifndef UINTMAX_C
 #error UINTMAX_C not defined
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/stdio_h.pass.cpp b/test/std/depr/depr.c.headers/stdio_h.pass.cpp
index 36c37a3be..97ea0d415 100644
--- a/test/std/depr/depr.c.headers/stdio_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/stdio_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -104,7 +103,7 @@
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations" // for tmpnam
 #endif
 
-int main()
+int main(int, char**)
 {
     FILE* fp = 0;
     fpos_t fpos = fpos_t();
@@ -166,4 +165,6 @@ int main()
     static_assert((std::is_same<decltype(feof(fp)), int>::value), "");
     static_assert((std::is_same<decltype(ferror(fp)), int>::value), "");
     static_assert((std::is_same<decltype(perror("")), void>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/stdlib_h.pass.cpp b/test/std/depr/depr.c.headers/stdlib_h.pass.cpp
index cc566d069..4c0218d6e 100644
--- a/test/std/depr/depr.c.headers/stdlib_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/stdlib_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@
 #error RAND_MAX not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     size_t s = 0; ((void)s);
     div_t d; ((void)d);
@@ -117,4 +116,6 @@ int main()
     static_assert((std::is_same<decltype(wctomb(pc,L' ')), int>::value), "");
     static_assert((std::is_same<decltype(mbstowcs(pw,"",0)), size_t>::value), "");
     static_assert((std::is_same<decltype(wcstombs(pc,pwc,0)), size_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/string_h.pass.cpp b/test/std/depr/depr.c.headers/string_h.pass.cpp
index db0308b7e..8ed1513b3 100644
--- a/test/std/depr/depr.c.headers/string_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/string_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #error NULL not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     size_t s = 0;
     void* vp = 0;
@@ -58,4 +57,6 @@ int main()
     static_assert((std::is_same<decltype(strstr(cpc, cpc)), const char*>::value), "");
     static_assert((std::is_same<decltype(memchr(vpc, 0, s)), const void*>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/tgmath_h.pass.cpp b/test/std/depr/depr.c.headers/tgmath_h.pass.cpp
index 91727b6cc..28cf93ada 100644
--- a/test/std/depr/depr.c.headers/tgmath_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/tgmath_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,10 +10,12 @@
 
 #include <tgmath.h>
 
-int main()
+int main(int, char**)
 {
     std::complex<double> cd;
     (void)cd;
     double x = sin(1.0);
     (void)x; // to placate scan-build
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/time_h.pass.cpp b/test/std/depr/depr.c.headers/time_h.pass.cpp
index a2639383c..5c2cc57bc 100644
--- a/test/std/depr/depr.c.headers/time_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/time_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #error CLOCKS_PER_SEC not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     clock_t c = 0; ((void)c);
     size_t s = 0;
@@ -37,4 +36,6 @@ int main()
     char* c1 = 0;
     const char* c2 = 0;
     static_assert((std::is_same<decltype(strftime(c1,s,c2,&tmv)), size_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/uchar_h.pass.cpp b/test/std/depr/depr.c.headers/uchar_h.pass.cpp
index be4ea0dae..cddf7a284 100644
--- a/test/std/depr/depr.c.headers/uchar_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/uchar_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,6 +15,8 @@
 
 #include <uchar.h>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/wchar_h.pass.cpp b/test/std/depr/depr.c.headers/wchar_h.pass.cpp
index f2e42a328..b964ea76f 100644
--- a/test/std/depr/depr.c.headers/wchar_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/wchar_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #error WEOF not defined
 #endif
 
-int main()
+int main(int, char**)
 {
 // mbstate_t comes from the underlying C library; it is defined (in C99) as:
 //    a complete object type other than an array type that can hold the conversion
@@ -127,4 +126,6 @@ int main()
     static_assert((std::is_same<decltype(vwprintf(L"", va)), int>::value), "");
     static_assert((std::is_same<decltype(wprintf(L"")), int>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.c.headers/wctype_h.pass.cpp b/test/std/depr/depr.c.headers/wctype_h.pass.cpp
index ad3107100..1774a7f08 100644
--- a/test/std/depr/depr.c.headers/wctype_h.pass.cpp
+++ b/test/std/depr/depr.c.headers/wctype_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -88,7 +87,7 @@
 #error wctrans defined
 #endif
 
-int main()
+int main(int, char**)
 {
     wint_t w = 0;
     wctrans_t wctr = 0;
@@ -111,4 +110,6 @@ int main()
     static_assert((std::is_same<decltype(towupper(w)), wint_t>::value), "");
     static_assert((std::is_same<decltype(towctrans(w, wctr)), wint_t>::value), "");
     static_assert((std::is_same<decltype(wctrans("")), wctrans_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.cxx1z.fail.cpp
index fc37c9a59..feb345b9a 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 double binary_f(int i, short j) {return i - j + .75;}
 
-int main()
+int main(int, char**)
 {
     typedef std::pointer_to_binary_function<int, short, double> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.pass.cpp
index e47731a65..53df5f348 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_binary_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 
 double binary_f(int i, short j) {return i - j + .75;}
 
-int main()
+int main(int, char**)
 {
     typedef std::pointer_to_binary_function<int, short, double> F;
     static_assert((std::is_base_of<std::binary_function<int, short, double>, F>::value), "");
     const F f(binary_f);
     assert(f(36, 27) == 9.75);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.cxx1z.fail.cpp
index 687a819a3..9d2d891bb 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 double unary_f(int i) {return 0.5 - i;}
 
-int main()
+int main(int, char**)
 {
     typedef std::pointer_to_unary_function<int, double> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.pass.cpp
index 2d713b3be..776fd309b 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/pointer_to_unary_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 
 double unary_f(int i) {return 0.5 - i;}
 
-int main()
+int main(int, char**)
 {
     typedef std::pointer_to_unary_function<int, double> F;
     static_assert((std::is_base_of<std::unary_function<int, double>, F>::value), "");
     const F f(unary_f);
     assert(f(36) == -35.5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.cxx1z.fail.cpp
index 2d2321936..e0e7889e9 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,9 @@
 
 double unary_f(int i) {return 0.5 - i;}
 
-int main()
+int main(int, char**)
 {
     assert(std::ptr_fun(unary_f)(36) == -35.5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.pass.cpp
index 65f2a8d34..b356be2e9 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 double unary_f(int i) {return 0.5 - i;}
 
-int main()
+int main(int, char**)
 {
     assert(std::ptr_fun(unary_f)(36) == -35.5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.cxx1z.fail.cpp
index 202abe25e..d97507296 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,9 @@
 
 double binary_f(int i, short j) {return i - j + .75;}
 
-int main()
+int main(int, char**)
 {
     assert(std::ptr_fun(binary_f)(36, 27) == 9.75);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.pass.cpp
index 5628c026c..885f7db67 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.function.pointer.adaptors/ptr_fun2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 double binary_f(int i, short j) {return i - j + .75;}
 
-int main()
+int main(int, char**)
 {
     assert(std::ptr_fun(binary_f)(36, 27) == 9.75);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.cxx1z.fail.cpp
index c77ecf92f..e346f07cc 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun(&A::a3)(&a) == 1);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.pass.cpp
index 4693c816c..d7052ee5a 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun(&A::a3)(&a) == 1);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.cxx1z.fail.cpp
index 24b86f542..e489a558e 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun(&A::a4)(&a, 6) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.pass.cpp
index 9f0b605d9..f3c35f257 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun(&A::a4)(&a, 6) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.cxx1z.fail.cpp
index b89aeb8cc..14368e6e9 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun1_ref_t<double, A, unsigned> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.pass.cpp
index 65fc8c07e..50782e09a 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_ref_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun1_ref_t<double, A, unsigned> F;
     static_assert((std::is_base_of<std::binary_function<A, unsigned, double>, F>::value), "");
     const F f(&A::a4);
     const A a = A();
     assert(f(a, 6) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.cxx1z.fail.cpp
index bb583aa37..afa0b781f 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun1_t<double, A, unsigned> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.pass.cpp
index 71588fa1f..cf0218e8f 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun1_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun1_t<double, A, unsigned> F;
     static_assert((std::is_base_of<std::binary_function<const A*, unsigned, double>, F>::value), "");
     const F f(&A::a4);
     const A a = A();
     assert(f(&a, 6) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.cxx1z.fail.cpp
index db4606adb..1217cfe59 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun_ref(&A::a3)(a) == 1);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.pass.cpp
index 22f44c65c..776531990 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun_ref(&A::a3)(a) == 1);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.cxx1z.fail.cpp
index cce5c4427..58251d130 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun_ref(&A::a4)(a, 6) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.pass.cpp
index 267b80681..4015675f8 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     const A a = A();
     assert(std::mem_fun_ref(&A::a4)(a, 6) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.cxx1z.fail.cpp
index 85ee737d8..577cfe537 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun_ref_t<int, A> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.pass.cpp
index 6f80993cb..61382dc40 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_ref_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun_ref_t<int, A> F;
     static_assert((std::is_base_of<std::unary_function<A, int>, F>::value), "");
     const F f(&A::a3);
     const A a = A();
     assert(f(a) == 1);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.cxx1z.fail.cpp
index 5bce7099c..ee24e4116 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun_t<int, A> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.pass.cpp
index 01945fc46..ca1065abf 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/const_mem_fun_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::const_mem_fun_t<int, A> F;
     static_assert((std::is_base_of<std::unary_function<const A*, int>, F>::value), "");
     const F f(&A::a3);
     const A a = A();
     assert(f(&a) == 1);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.cxx1z.fail.cpp
index 523a2a612..a000ac5ee 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun(&A::a1)(&a) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.pass.cpp
index f3c12973f..6b707c4ad 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun(&A::a1)(&a) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.cxx1z.fail.cpp
index 9b7101f58..626c9102e 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun(&A::a2)(&a, 5) == 6);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.pass.cpp
index 30f3c9422..5abf157a6 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun(&A::a2)(&a, 5) == 6);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.cxx1z.fail.cpp
index 2713b2f8d..4ac39e764 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun1_ref_t<short, A, int> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.pass.cpp
index 0b63bb76d..ec21c42c9 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_ref_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun1_ref_t<short, A, int> F;
     static_assert((std::is_base_of<std::binary_function<A, int, short>, F>::value), "");
     const F f(&A::a2);
     A a;
     assert(f(a, 5) == 6);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.cxx1z.fail.cpp
index 22e7fd6b9..6471f8e91 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun1_t<short, A, int> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.pass.cpp
index 79895c4b4..d696bae06 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun1_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun1_t<short, A, int> F;
     static_assert((std::is_base_of<std::binary_function<A*, int, short>, F>::value), "");
     const F f(&A::a2);
     A a;
     assert(f(&a, 5) == 6);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.cxx1z.fail.cpp
index 6f85dae41..e6227509f 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun_ref(&A::a1)(a) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.pass.cpp
index 8a6a8b943..e22a7f03d 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun_ref(&A::a1)(a) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.cxx1z.fail.cpp
index b881cb71f..c633e769d 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun_ref(&A::a2)(a, 5) == 6);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.pass.cpp
index 142b16a6b..1ff7a9af9 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     A a;
     assert(std::mem_fun_ref(&A::a2)(a, 5) == 6);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.cxx1z.fail.cpp
index 62e8daed1..02c3213be 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun_ref_t<char, A> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.pass.cpp
index 5af028b39..037454ed2 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_ref_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun_ref_t<char, A> F;
     static_assert((std::is_base_of<std::unary_function<A, char>, F>::value), "");
     const F f(&A::a1);
     A a;
     assert(f(a) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.cxx1z.fail.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.cxx1z.fail.cpp
index b2d6db84c..ec379d724 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.cxx1z.fail.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.cxx1z.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun_t<char, A> F;
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.pass.cpp
index c33e2f7d7..e14ea14d1 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/depr.member.pointer.adaptors/mem_fun_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
     double a4(unsigned i) const {return i-1;}
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::mem_fun_t<char, A> F;
     static_assert((std::is_base_of<std::unary_function<A*, char>, F>::value), "");
     const F f(&A::a1);
     A a;
     assert(f(&a) == 5);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.adaptors/nothing_to_do.pass.cpp b/test/std/depr/depr.function.objects/depr.adaptors/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/depr/depr.function.objects/depr.adaptors/nothing_to_do.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.adaptors/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.base/binary_function.pass.cpp b/test/std/depr/depr.function.objects/depr.base/binary_function.pass.cpp
index 0ae3b00d2..dbe6d1eb9 100644
--- a/test/std/depr/depr.function.objects/depr.base/binary_function.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.base/binary_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,9 +21,11 @@
 #include <functional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::binary_function<int, unsigned, char>::first_argument_type, int>::value), "");
     static_assert((std::is_same<std::binary_function<int, unsigned, char>::second_argument_type, unsigned>::value), "");
     static_assert((std::is_same<std::binary_function<int, unsigned, char>::result_type, char>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/depr.base/unary_function.pass.cpp b/test/std/depr/depr.function.objects/depr.base/unary_function.pass.cpp
index ededc5376..0aaf3fc13 100644
--- a/test/std/depr/depr.function.objects/depr.base/unary_function.pass.cpp
+++ b/test/std/depr/depr.function.objects/depr.base/unary_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 #include <functional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::unary_function<unsigned, char>::argument_type, unsigned>::value), "");
     static_assert((std::is_same<std::unary_function<unsigned, char>::result_type, char>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.function.objects/nothing_to_do.pass.cpp b/test/std/depr/depr.function.objects/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/depr/depr.function.objects/nothing_to_do.pass.cpp
+++ b/test/std/depr/depr.function.objects/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.ios.members/io_state.pass.cpp b/test/std/depr/depr.ios.members/io_state.pass.cpp
index 6b362d016..37b23fc5e 100644
--- a/test/std/depr/depr.ios.members/io_state.pass.cpp
+++ b/test/std/depr/depr.ios.members/io_state.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER <= 14
     std::strstream::io_state b = std::strstream::eofbit;
     assert(b == std::ios::eofbit);
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.ios.members/open_mode.pass.cpp b/test/std/depr/depr.ios.members/open_mode.pass.cpp
index cf91e7c9d..57a88c957 100644
--- a/test/std/depr/depr.ios.members/open_mode.pass.cpp
+++ b/test/std/depr/depr.ios.members/open_mode.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER <= 14
     std::strstream::open_mode b = std::strstream::app;
     assert(b == std::ios::app);
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.ios.members/seek_dir.pass.cpp b/test/std/depr/depr.ios.members/seek_dir.pass.cpp
index 0dd70c101..5b48073bd 100644
--- a/test/std/depr/depr.ios.members/seek_dir.pass.cpp
+++ b/test/std/depr/depr.ios.members/seek_dir.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER <= 14
     std::strstream::seek_dir b = std::strstream::cur;
     assert(b == std::ios::cur);
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.ios.members/streamoff.pass.cpp b/test/std/depr/depr.ios.members/streamoff.pass.cpp
index 0c237b354..8abced55e 100644
--- a/test/std/depr/depr.ios.members/streamoff.pass.cpp
+++ b/test/std/depr/depr.ios.members/streamoff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 #include <ios>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER <= 14
     static_assert((std::is_integral<std::ios_base::streamoff>::value), "");
     static_assert((std::is_signed<std::ios_base::streamoff>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.ios.members/streampos.pass.cpp b/test/std/depr/depr.ios.members/streampos.pass.cpp
index 863905f71..7e9572703 100644
--- a/test/std/depr/depr.ios.members/streampos.pass.cpp
+++ b/test/std/depr/depr.ios.members/streampos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,9 +20,11 @@
 #include <ios>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER <= 14
     static_assert((std::is_same<std::ios_base::streampos, std::streampos>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.fail.cpp b/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.fail.cpp
index 652f53181..e00cfe7c3 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.fail.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@
 #include "../test_func.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::bind1st(test_func(1), 5); // expected-error{{'bind1st<test_func, int>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.pass.cpp b/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.pass.cpp
index 796e4ad87..5d89f369f 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.pass.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include "../test_func.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::bind1st(test_func(1), 5)(10.) == -5.);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.fail.cpp b/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.fail.cpp
index 95cf150cc..d31189b0b 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.fail.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@
 #include "../test_func.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::bind2nd(test_func(1), 5); // expected-error{{'bind2nd<test_func, int>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.pass.cpp b/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.pass.cpp
index cbf1dbf9f..243ffd116 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.pass.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include "../test_func.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::bind2nd(test_func(1), 5)(10) == 5.);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.fail.cpp b/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.fail.cpp
index 8f57eba4d..92d93b01f 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.fail.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@
 #include "../test_func.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::binder1st<test_func> B1ST; // expected-error{{'binder1st<test_func>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.pass.cpp b/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.pass.cpp
index 480148b76..66df2614e 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.pass.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,8 +51,10 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     t.do_test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.fail.cpp b/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.fail.cpp
index c49334fa0..f2dd19072 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.fail.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@
 #include "../test_func.h"
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::binder2nd<test_func> B2ND; // expected-error{{'binder2nd<test_func>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.pass.cpp b/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.pass.cpp
index 3dfb1f02d..f8cb7d467 100644
--- a/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.pass.cpp
+++ b/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,8 +51,10 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     t.do_test();
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/nothing_to_do.pass.cpp b/test/std/depr/depr.lib.binders/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/depr/depr.lib.binders/nothing_to_do.pass.cpp
+++ b/test/std/depr/depr.lib.binders/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/depr.lib.binders/test_func.h b/test/std/depr/depr.lib.binders/test_func.h
index 1c1a46774..57a208196 100644
--- a/test/std/depr/depr.lib.binders/test_func.h
+++ b/test/std/depr/depr.lib.binders/test_func.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp.pass.cpp b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp.pass.cpp
index 078d8911d..90288578f 100644
--- a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     {
         const char buf[] = "123 4.5 dog";
@@ -41,4 +40,6 @@ int main()
         assert(buf[9] == 'o');
         assert(buf[10] == 'g');
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp_size.pass.cpp b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp_size.pass.cpp
index 8b4ae722f..867225bf8 100644
--- a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp_size.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     {
         const char buf[] = "123 4.5 dog";
@@ -41,4 +40,6 @@ int main()
         assert(buf[5] == '.');
         assert(buf[6] == '5');
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp.pass.cpp b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp.pass.cpp
index 23068f5fd..106aaa768 100644
--- a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "123 4.5 dog";
@@ -41,4 +40,6 @@ int main()
         assert(buf[9] == 'g');
         assert(buf[10] == 'g');
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp_size.pass.cpp b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp_size.pass.cpp
index ff797e092..79a0bfeec 100644
--- a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp_size.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "123 4.5 dog";
@@ -41,4 +40,6 @@ int main()
         assert(buf[5] == '5');
         assert(buf[6] == '5');
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/rdbuf.pass.cpp b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/rdbuf.pass.cpp
index 0c273b346..68b2ee8c4 100644
--- a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/rdbuf.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const char buf[] = "123 4.5 dog";
@@ -24,4 +23,6 @@ int main()
         std::strstreambuf* sb = in.rdbuf();
         assert(sb->sgetc() == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/str.pass.cpp b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/str.pass.cpp
index deb43d6f6..bae107838 100644
--- a/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/str.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const char buf[] = "123 4.5 dog";
         std::istrstream in(buf);
         assert(in.str() == std::string("123 4.5 dog"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.istrstream/types.pass.cpp b/test/std/depr/depr.str.strstreams/depr.istrstream/types.pass.cpp
index 4e158c6f0..80f5af082 100644
--- a/test/std/depr/depr.str.strstreams/depr.istrstream/types.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.istrstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 #include <strstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::istream, std::istrstream>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/cp_size_mode.pass.cpp b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/cp_size_mode.pass.cpp
index b6519de8e..81c84fe32 100644
--- a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/cp_size_mode.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/cp_size_mode.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "123 4.5 dog";
@@ -39,4 +38,6 @@ int main()
         out << i << ' ' << d << ' ' << s << std::ends;
         assert(out.str() == std::string("123 4.5 dog321 5.5 cat"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/default.pass.cpp b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/default.pass.cpp
index 29debf187..5f9e9e6a8 100644
--- a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/default.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     std::ostrstream out;
     int i = 123;
@@ -26,4 +25,6 @@ int main()
     out << i << ' ' << d << ' ' << s << std::ends;
     assert(out.str() == std::string("123 4.5 dog"));
     out.freeze(false);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/freeze.pass.cpp b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/freeze.pass.cpp
index a60c7cba6..4b3412edc 100644
--- a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/freeze.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/freeze.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostrstream out;
@@ -31,4 +30,6 @@ int main()
         assert(out.str() == std::string("a"));
         out.freeze(false);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/pcount.pass.cpp b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/pcount.pass.cpp
index 4a752d659..73a4bb81e 100644
--- a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/pcount.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/pcount.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostrstream out;
@@ -24,4 +23,6 @@ int main()
         out << 123 << ' ' << 4.5 << ' ' << "dog";
         assert(out.pcount() == 11);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/rdbuf.pass.cpp b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/rdbuf.pass.cpp
index b8a23b227..ff58af45b 100644
--- a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/rdbuf.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "123 4.5 dog";
@@ -25,4 +24,6 @@ int main()
         assert(sb->sputc('a') == 'a');
         assert(buf == std::string("a23 4.5 dog"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/str.pass.cpp b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/str.pass.cpp
index 9a7160f45..60ec02f34 100644
--- a/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/str.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostrstream out;
@@ -24,4 +23,6 @@ int main()
         assert(out.str() == std::string("123 4.5 dog"));
         out.freeze(false);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.ostrstream/types.pass.cpp b/test/std/depr/depr.str.strstreams/depr.ostrstream/types.pass.cpp
index 88ab272a7..5fde85037 100644
--- a/test/std/depr/depr.str.strstreams/depr.ostrstream/types.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.ostrstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 #include <strstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::ostream, std::ostrstream>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/cp_size_mode.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/cp_size_mode.pass.cpp
index 1dc03b8aa..2387b1eeb 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/cp_size_mode.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/cp_size_mode.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "123 4.5 dog";
@@ -57,4 +56,6 @@ int main()
         inout << i << ' ' << d << ' ' << s;
         assert(inout.str() == std::string("123 4.5 dog321 5.5 cat"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/default.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/default.pass.cpp
index 6298fcac3..0e278490a 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/default.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,10 @@
 
 #include <strstream>
 #include <cassert>
+#include <cstring>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     std::strstream inout;
     int i = 123;
@@ -31,6 +31,8 @@ int main()
     inout >> i >> d >> s;
     assert(i == 123);
     assert(d == 4.5);
-    assert(strcmp(s.c_str(), "dog") == 0);
+    assert(std::strcmp(s.c_str(), "dog") == 0);
     inout.freeze(false);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.dest/rdbuf.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.dest/rdbuf.pass.cpp
index 4adb179b3..b4eb17397 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.dest/rdbuf.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.dest/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "123 4.5 dog";
@@ -25,4 +24,6 @@ int main()
         assert(sb->sputc('a') == 'a');
         assert(buf == std::string("a23 4.5 dog"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/freeze.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/freeze.pass.cpp
index 473433885..dab7c04a6 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/freeze.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/freeze.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::strstream out;
@@ -31,4 +30,6 @@ int main()
         assert(out.str() == std::string("a"));
         out.freeze(false);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/pcount.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/pcount.pass.cpp
index 18b6350d5..3a7641b23 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/pcount.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/pcount.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::strstream out;
@@ -24,4 +23,6 @@ int main()
         out << 123 << ' ' << 4.5 << ' ' << "dog";
         assert(out.pcount() == 11);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/str.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/str.pass.cpp
index 5c273dc45..f3482c756 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/str.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::strstream out;
@@ -24,4 +23,6 @@ int main()
         assert(out.str() == std::string("123 4.5 dog"));
         out.freeze(false);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstream/types.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstream/types.pass.cpp
index 67ea32432..7944b7899 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstream/types.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,11 +21,13 @@
 #include <strstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::iostream, std::strstream>::value), "");
     static_assert((std::is_same<std::strstream::char_type, char>::value), "");
     static_assert((std::is_same<std::strstream::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::strstream::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::strstream::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ccp_size.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ccp_size.pass.cpp
index 04eaab5ad..08cb61914 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ccp_size.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ccp_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const char buf[] = "abcd";
@@ -37,4 +36,6 @@ int main()
         assert(sb.snextc() == 'd');
         assert(sb.snextc() == EOF);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cp_size_cp.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cp_size_cp.pass.cpp
index 1bac82d30..19eb15f94 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cp_size_cp.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cp_size_cp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstring>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "abcd";
@@ -94,4 +93,6 @@ int main()
         assert(sb.snextc() == 'j');
         assert(sb.snextc() == EOF);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cscp_size.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cscp_size.pass.cpp
index 13ae427a1..8cba11fac 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cscp_size.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cscp_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const signed char buf[] = "abcd";
@@ -37,4 +36,6 @@ int main()
         assert(sb.snextc() == 'd');
         assert(sb.snextc() == EOF);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cucp_size.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cucp_size.pass.cpp
index 3a09711c0..9546b74db 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cucp_size.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cucp_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         unsigned char buf[] = "abcd";
@@ -37,4 +36,6 @@ int main()
         assert(sb.snextc() == 'd');
         assert(sb.snextc() == EOF);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp
index e466d50c6..d7587c005 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct test
         {return std::strstreambuf::overflow(c);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test s(my_alloc, my_free);
@@ -48,4 +47,6 @@ int main()
         assert(called == 1);
     }
     assert(called == 2);
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/default.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/default.pass.cpp
index 1e5635e46..2764efd0e 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/default.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::strstreambuf s;
@@ -28,4 +27,6 @@ int main()
         assert(s.str() == nullptr);
         assert(s.pcount() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/scp_size_scp.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/scp_size_scp.pass.cpp
index 289b61f43..fdd46164b 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/scp_size_scp.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/scp_size_scp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstring>
 
-int main()
+int main(int, char**)
 {
     {
         signed char buf[] = "abcd";
@@ -94,4 +93,6 @@ int main()
         assert(sb.snextc() == 'j');
         assert(sb.snextc() == EOF);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ucp_size_ucp.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ucp_size_ucp.pass.cpp
index b0920f7a7..80aafd448 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ucp_size_ucp.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ucp_size_ucp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstring>
 
-int main()
+int main(int, char**)
 {
     {
         unsigned char buf[] = "abcd";
@@ -94,4 +93,6 @@ int main()
         assert(sb.snextc() == 'j');
         assert(sb.snextc() == EOF);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/freeze.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/freeze.pass.cpp
index 9572ef30d..4cbb7b80a 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/freeze.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/freeze.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::strstreambuf sb;
@@ -25,4 +24,6 @@ int main()
         sb.freeze(false);
         assert(sb.sputc('a') == 'a');
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/overflow.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/overflow.pass.cpp
index 652100c97..b47a34ed8 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/overflow.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/overflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <string>
 #include <strstream>
 
-int main() {
+int main(int, char**) {
   std::ostrstream oss;
   std::string s;
 
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/pcount.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/pcount.pass.cpp
index d96f0f769..1d2f34d92 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/pcount.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/pcount.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::strstreambuf sb;
@@ -29,4 +28,6 @@ int main()
         assert(sb.pcount() == 2);
         sb.freeze(false);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/str.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/str.pass.cpp
index 27de56f2c..04ecb94cb 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/str.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::strstreambuf sb;
@@ -25,4 +24,6 @@ int main()
         assert(sb.str() == std::string("a"));
         sb.freeze(false);
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/overflow.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/overflow.pass.cpp
index 843450b71..19cb7abf1 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/overflow.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/overflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[12] = "abc";
@@ -44,4 +43,6 @@ int main()
         assert(sb.sputc('1') == '1');
         assert(sb.str() == std::string("12345678901"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/pbackfail.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/pbackfail.pass.cpp
index 2a3fe202e..59fdb640d 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/pbackfail.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/pbackfail.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct test
     virtual int_type pbackfail(int_type c = EOF) {return base::pbackfail(c);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const char buf[] = "123";
@@ -59,4 +58,6 @@ int main()
         assert(sb.pbackfail(EOF) == EOF);
         assert(sb.str() == std::string("133"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekoff.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekoff.pass.cpp
index 27d5d29db..8e1f22eeb 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekoff.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekoff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "0123456789";
@@ -54,4 +53,6 @@ int main()
         assert(sb.sputc('c') == 'c');
         assert(sb.str() == std::string("012a456c89"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekpos.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekpos.pass.cpp
index d412479d8..9d13dc4aa 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekpos.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekpos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "0123456789";
@@ -36,4 +35,6 @@ int main()
         assert(sb.sputc('a') == 'a');
         assert(sb.str() == std::string("012a456789"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/setbuf.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/setbuf.pass.cpp
index 99eb9e93a..c78004e21 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/setbuf.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/setbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <strstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         char buf[] = "0123456789";
@@ -24,4 +23,6 @@ int main()
         assert(sb.pubsetbuf(0, 0) == &sb);
         assert(sb.str() == std::string("0123456789"));
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.cpp
index 1b16a37aa..e8da2957c 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct test
     base::int_type underflow() {return base::underflow();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         char buf[10] = "123";
@@ -48,4 +47,6 @@ int main()
         assert(sb.underflow() == '4');
         assert(sb.underflow() == '4');
     }
+
+  return 0;
 }
diff --git a/test/std/depr/depr.str.strstreams/depr.strstreambuf/types.pass.cpp b/test/std/depr/depr.str.strstreams/depr.strstreambuf/types.pass.cpp
index c4a1562bf..398605af9 100644
--- a/test/std/depr/depr.str.strstreams/depr.strstreambuf/types.pass.cpp
+++ b/test/std/depr/depr.str.strstreams/depr.strstreambuf/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <strstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::streambuf, std::strstreambuf>::value), "");
+
+  return 0;
 }
diff --git a/test/std/depr/exception.unexpected/nothing_to_do.pass.cpp b/test/std/depr/exception.unexpected/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/depr/exception.unexpected/nothing_to_do.pass.cpp
+++ b/test/std/depr/exception.unexpected/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/depr/exception.unexpected/set.unexpected/get_unexpected.pass.cpp b/test/std/depr/exception.unexpected/set.unexpected/get_unexpected.pass.cpp
index 5c596da5a..7b11c3037 100644
--- a/test/std/depr/exception.unexpected/set.unexpected/get_unexpected.pass.cpp
+++ b/test/std/depr/exception.unexpected/set.unexpected/get_unexpected.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ void f3()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
 
     std::unexpected_handler old = std::get_unexpected();
@@ -38,4 +37,6 @@ int main()
     std::set_terminate(f3);
     (*old)();
     assert(0);
+
+  return 0;
 }
diff --git a/test/std/depr/exception.unexpected/set.unexpected/set_unexpected.pass.cpp b/test/std/depr/exception.unexpected/set.unexpected/set_unexpected.pass.cpp
index 9b9d726f7..38ae81ec9 100644
--- a/test/std/depr/exception.unexpected/set.unexpected/set_unexpected.pass.cpp
+++ b/test/std/depr/exception.unexpected/set.unexpected/set_unexpected.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ void f3()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     std::unexpected_handler old = std::set_unexpected(f1);
     // verify there is a previous unexpected handler
@@ -34,4 +33,6 @@ int main()
     std::set_terminate(f3);
     (*old)();
     assert(0);
+
+  return 0;
 }
diff --git a/test/std/depr/exception.unexpected/unexpected.handler/unexpected_handler.pass.cpp b/test/std/depr/exception.unexpected/unexpected.handler/unexpected_handler.pass.cpp
index f6bc5bc5a..e4d4869d7 100644
--- a/test/std/depr/exception.unexpected/unexpected.handler/unexpected_handler.pass.cpp
+++ b/test/std/depr/exception.unexpected/unexpected.handler/unexpected_handler.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
     std::unexpected_handler p = f;
     ((void)p);
+
+  return 0;
 }
diff --git a/test/std/depr/exception.unexpected/unexpected/unexpected.pass.cpp b/test/std/depr/exception.unexpected/unexpected/unexpected.pass.cpp
index 92d4d38e2..2562b7884 100644
--- a/test/std/depr/exception.unexpected/unexpected/unexpected.pass.cpp
+++ b/test/std/depr/exception.unexpected/unexpected/unexpected.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,9 +19,11 @@ void f1()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     std::set_unexpected(f1);
     std::unexpected();
     assert(false);
+
+  return 0;
 }
diff --git a/test/std/depr/nothing_to_do.pass.cpp b/test/std/depr/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/depr/nothing_to_do.pass.cpp
+++ b/test/std/depr/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/assertions/cassert.pass.cpp b/test/std/diagnostics/assertions/cassert.pass.cpp
index 3f886e7b9..a18a4d0df 100644
--- a/test/std/diagnostics/assertions/cassert.pass.cpp
+++ b/test/std/diagnostics/assertions/cassert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #error assert not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/diagnostics.general/nothing_to_do.pass.cpp b/test/std/diagnostics/diagnostics.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/diagnostics/diagnostics.general/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/diagnostics.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/errno/cerrno.pass.cpp b/test/std/diagnostics/errno/cerrno.pass.cpp
index 72c9371d1..452f99e33 100644
--- a/test/std/diagnostics/errno/cerrno.pass.cpp
+++ b/test/std/diagnostics/errno/cerrno.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -340,6 +339,8 @@
 #error errno not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/nothing_to_do.pass.cpp b/test/std/diagnostics/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/diagnostics/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/domain.error/domain_error.pass.cpp b/test/std/diagnostics/std.exceptions/domain.error/domain_error.pass.cpp
index 5769d2505..31a320d11 100644
--- a/test/std/diagnostics/std.exceptions/domain.error/domain_error.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/domain.error/domain_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::logic_error, std::domain_error>::value),
                  "std::is_base_of<std::logic_error, std::domain_error>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/invalid.argument/invalid_argument.pass.cpp b/test/std/diagnostics/std.exceptions/invalid.argument/invalid_argument.pass.cpp
index e360275a6..00d9a9296 100644
--- a/test/std/diagnostics/std.exceptions/invalid.argument/invalid_argument.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/invalid.argument/invalid_argument.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::logic_error, std::invalid_argument>::value),
                  "std::is_base_of<std::logic_error, std::invalid_argument>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/length.error/length_error.pass.cpp b/test/std/diagnostics/std.exceptions/length.error/length_error.pass.cpp
index 3a9144121..1e8f1e46c 100644
--- a/test/std/diagnostics/std.exceptions/length.error/length_error.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/length.error/length_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::logic_error, std::length_error>::value),
                  "std::is_base_of<std::logic_error, std::length_error>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/logic.error/logic_error.pass.cpp b/test/std/diagnostics/std.exceptions/logic.error/logic_error.pass.cpp
index 3c3d4f4f9..e30b3b9f8 100644
--- a/test/std/diagnostics/std.exceptions/logic.error/logic_error.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/logic.error/logic_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::logic_error>::value),
                  "std::is_base_of<std::exception, std::logic_error>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/out.of.range/out_of_range.pass.cpp b/test/std/diagnostics/std.exceptions/out.of.range/out_of_range.pass.cpp
index f358d2b76..01a5b46b4 100644
--- a/test/std/diagnostics/std.exceptions/out.of.range/out_of_range.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/out.of.range/out_of_range.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::logic_error, std::out_of_range>::value),
                  "std::is_base_of<std::logic_error, std::out_of_range>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/overflow.error/overflow_error.pass.cpp b/test/std/diagnostics/std.exceptions/overflow.error/overflow_error.pass.cpp
index 47f75eb0f..a9e7fb994 100644
--- a/test/std/diagnostics/std.exceptions/overflow.error/overflow_error.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/overflow.error/overflow_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::runtime_error, std::overflow_error>::value),
                  "std::is_base_of<std::runtime_error, std::overflow_error>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/range.error/range_error.pass.cpp b/test/std/diagnostics/std.exceptions/range.error/range_error.pass.cpp
index 8c82a9189..92d1151ff 100644
--- a/test/std/diagnostics/std.exceptions/range.error/range_error.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/range.error/range_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::runtime_error, std::range_error>::value),
                  "std::is_base_of<std::runtime_error, std::range_error>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/runtime.error/runtime_error.pass.cpp b/test/std/diagnostics/std.exceptions/runtime.error/runtime_error.pass.cpp
index 2b2fe20c6..c4b8eea74 100644
--- a/test/std/diagnostics/std.exceptions/runtime.error/runtime_error.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/runtime.error/runtime_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::runtime_error>::value),
                  "std::is_base_of<std::exception, std::runtime_error>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/std.exceptions/underflow.error/underflow_error.pass.cpp b/test/std/diagnostics/std.exceptions/underflow.error/underflow_error.pass.cpp
index 103c290ac..88a3f46fb 100644
--- a/test/std/diagnostics/std.exceptions/underflow.error/underflow_error.pass.cpp
+++ b/test/std/diagnostics/std.exceptions/underflow.error/underflow_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::runtime_error, std::underflow_error>::value),
                  "std::is_base_of<std::runtime_error, std::underflow_error>::value");
@@ -39,4 +38,6 @@ int main()
     e2 = e;
     assert(e2.what() == msg);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/errc.pass.cpp b/test/std/diagnostics/syserr/errc.pass.cpp
index 247e10bf8..201878d2d 100644
--- a/test/std/diagnostics/syserr/errc.pass.cpp
+++ b/test/std/diagnostics/syserr/errc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 
 #include <system_error>
 
-int main()
+int main(int, char**)
 {
     static_assert(static_cast<int>(std::errc::address_family_not_supported) == EAFNOSUPPORT, "");
     static_assert(static_cast<int>(std::errc::address_in_use) == EADDRINUSE, "");
@@ -101,4 +100,6 @@ int main()
     static_assert(static_cast<int>(std::errc::too_many_symbolic_link_levels) == ELOOP, "");
     static_assert(static_cast<int>(std::errc::value_too_large) == EOVERFLOW, "");
     static_assert(static_cast<int>(std::errc::wrong_protocol_type) == EPROTOTYPE, "");
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/is_error_code_enum.pass.cpp b/test/std/diagnostics/syserr/is_error_code_enum.pass.cpp
index a74bd2f6b..2a44b5ee3 100644
--- a/test/std/diagnostics/syserr/is_error_code_enum.pass.cpp
+++ b/test/std/diagnostics/syserr/is_error_code_enum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@ namespace std
 }
 
 
-int main()
+int main(int, char**)
 {
     test<false, void>();
     test<false, int>();
@@ -48,4 +47,6 @@ int main()
     test<false, std::string>();
 
     test<true, A>();
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp b/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp
index 1321dcc6b..df89fc334 100644
--- a/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp
+++ b/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ namespace std
 }
 
 
-int main()
+int main(int, char**)
 {
     test<false, void>();
     test<false, int>();
@@ -48,4 +47,6 @@ int main()
     test<false, std::string>();
 
     test<true, A>();
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.compare/eq_error_code_error_code.pass.cpp b/test/std/diagnostics/syserr/syserr.compare/eq_error_code_error_code.pass.cpp
index e2e7aeda8..0e2dbe552 100644
--- a/test/std/diagnostics/syserr/syserr.compare/eq_error_code_error_code.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.compare/eq_error_code_error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::error_code e_code1(5, std::generic_category());
     std::error_code e_code2(5, std::system_category());
@@ -103,4 +102,6 @@ int main()
     assert(e_condition4 != e_condition2);
     assert(e_condition4 != e_condition3);
     assert(e_condition4 == e_condition4);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/nothing_to_do.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.derived/message.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.derived/message.pass.cpp
index 82770fb43..ed580198e 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.derived/message.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.derived/message.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat1 = std::generic_category();
     const std::error_category& e_cat2 = std::system_category();
@@ -31,4 +30,6 @@ int main()
     assert(!m3.empty());
     assert(m1 == m2);
     assert(m1 != m3);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/default_ctor.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/default_ctor.pass.cpp
index f6a97ef92..185f96e26 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/default_ctor.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/default_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ public:
     virtual std::string message(int) const {return std::string();}
 };
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_nothrow_default_constructible<test1>::value,
                                  "error_category() must exist and be noexcept");
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/eq.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/eq.pass.cpp
index bec5e630a..ce09481e3 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/eq.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat1 = std::generic_category();
     const std::error_category& e_cat2 = std::generic_category();
     const std::error_category& e_cat3 = std::system_category();
     assert(e_cat1 == e_cat2);
     assert(!(e_cat1 == e_cat3));
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/lt.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/lt.pass.cpp
index 707604e48..db6b3b908 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/lt.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat1 = std::generic_category();
     const std::error_category& e_cat2 = std::generic_category();
     const std::error_category& e_cat3 = std::system_category();
     assert(!(e_cat1 < e_cat2) && !(e_cat2 < e_cat1));
     assert((e_cat1 < e_cat3) || (e_cat3 < e_cat1));
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/neq.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/neq.pass.cpp
index e74458f3f..2826018d3 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/neq.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.nonvirtuals/neq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat1 = std::generic_category();
     const std::error_category& e_cat2 = std::generic_category();
     const std::error_category& e_cat3 = std::system_category();
     assert(!(e_cat1 != e_cat2));
     assert(e_cat1 != e_cat3);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp
index cd76a9f5e..f04427381 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/generic_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test_message_for_bad_value() {
     assert(errno == E2BIG);
 }
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat1 = std::generic_category();
     std::string m1 = e_cat1.name();
@@ -44,4 +43,6 @@ int main()
     {
         test_message_for_bad_value();
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp
index c9c6d52e2..8374c8766 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.objects/system_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test_message_for_bad_value() {
     assert(errno == E2BIG);
 }
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat1 = std::system_category();
     std::error_condition e_cond = e_cat1.default_error_condition(5);
@@ -48,4 +47,6 @@ int main()
     {
         test_message_for_bad_value();
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.overview/error_category.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.overview/error_category.pass.cpp
index 79162ddaa..112c39448 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.overview/error_category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.overview/error_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,8 +12,10 @@
 
 #include <system_error>
 
-int main()
+int main(int, char**)
 {
     std::error_category* p = 0;
     ((void)p);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/default_error_condition.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/default_error_condition.pass.cpp
index dd5182712..07daf6f49 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/default_error_condition.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/default_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat = std::generic_category();
     std::error_condition e_cond = e_cat.default_error_condition(static_cast<int>(std::errc::not_a_directory));
     assert(e_cond.category() == e_cat);
     assert(e_cond.value() == static_cast<int>(std::errc::not_a_directory));
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_error_code_int.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_error_code_int.pass.cpp
index d26541d94..768222798 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_error_code_int.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_error_code_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat = std::generic_category();
     assert(e_cat.equivalent(std::error_code(5, e_cat), 5));
     assert(!e_cat.equivalent(std::error_code(5, e_cat), 6));
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_int_error_condition.pass.cpp b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_int_error_condition.pass.cpp
index d7cf844df..7e627d409 100644
--- a/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_int_error_condition.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.virtuals/equivalent_int_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat = std::generic_category();
     std::error_condition e_cond = e_cat.default_error_condition(5);
     assert(e_cat.equivalent(5, e_cond));
     assert(!e_cat.equivalent(6, e_cond));
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/nothing_to_do.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp
index 0100b1c77..bfebd012b 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/ErrorCodeEnum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,11 +33,13 @@ make_error_code(testing x)
     return std::error_code(static_cast<int>(x), std::generic_category());
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec(two);
         assert(ec.value() == 2);
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/default.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/default.pass.cpp
index 569681b75..3a7249ede 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/default.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::error_code ec;
     assert(ec.value() == 0);
     assert(ec.category() == std::system_category());
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/int_error_category.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/int_error_category.pass.cpp
index 56489bb71..5a2150fbf 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/int_error_category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.constructors/int_error_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec(6, std::system_category());
@@ -28,4 +27,6 @@ int main()
         assert(ec.value() == 8);
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp
index 6c073c9fd..a98e22944 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/ErrorCodeEnum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ make_error_code(testing x)
     return std::error_code(static_cast<int>(x), std::generic_category());
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec;
@@ -42,4 +41,6 @@ int main()
         assert(ec.value() == 2);
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/assign.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/assign.pass.cpp
index 967692a4f..998cfd354 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/assign.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec;
@@ -30,4 +29,6 @@ int main()
         assert(ec.value() == 8);
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/clear.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/clear.pass.cpp
index 83faa03d2..c4b7eca25 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/clear.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec;
@@ -27,4 +26,6 @@ int main()
         assert(ec.value() == 0);
         assert(ec.category() == std::system_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/lt.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/lt.pass.cpp
index 01abc42b3..9dc37fc34 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/lt.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_code ec1(6, std::generic_category());
         const std::error_code ec2(7, std::generic_category());
         assert(ec1 < ec2);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/make_error_code.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/make_error_code.pass.cpp
index fc4e0f2b2..1f4603f7c 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/make_error_code.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/make_error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec = make_error_code(std::errc::operation_canceled);
         assert(ec.value() == static_cast<int>(std::errc::operation_canceled));
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/stream_inserter.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/stream_inserter.pass.cpp
index 09c87e5ce..37e1d817d 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/stream_inserter.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.nonmembers/stream_inserter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ostringstream out;
     out << std::error_code(std::io_errc::stream);
     assert(out.str() == "iostream:1");
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.fail.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.fail.cpp
index 8a9a1a232..902e108a1 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.fail.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ bool test_func(void)
     return ec;   // conversion to bool is explicit; should fail.
 }
 
-int main()
+int main(int, char**)
 {
     return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.pass.cpp
index 0b2002401..11bea5a34 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_code ec(6, std::generic_category());
@@ -27,4 +26,6 @@ int main()
         const std::error_code ec(0, std::generic_category());
         assert(!static_cast<bool>(ec));
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/category.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/category.pass.cpp
index f2e50cf65..16197d934 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_code ec(6, std::generic_category());
     assert(ec.category() == std::generic_category());
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/default_error_condition.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/default_error_condition.pass.cpp
index 0a67cd5db..4c92b488e 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/default_error_condition.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/default_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_code ec(6, std::generic_category());
@@ -28,4 +27,6 @@ int main()
         std::error_condition e_cond = ec.default_error_condition();
         assert(e_cond == ec);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/message.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/message.pass.cpp
index 530f42ca9..513eeae77 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/message.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/message.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,8 +16,10 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_code ec(6, std::generic_category());
     assert(ec.message() == std::generic_category().message(6));
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/value.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/value.pass.cpp
index 1047b7d42..f1fcee414 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/value.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.observers/value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_code ec(6, std::system_category());
     assert(ec.value() == 6);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/types.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/types.pass.cpp
index 6c76a2552..b2441ac97 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/types.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,10 +14,12 @@
 #include <system_error>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::error_code x;
     TEST_IGNORE_NODISCARD  x.category();   // returns a std::error_category &
     TEST_IGNORE_NODISCARD  x.default_error_condition(); // std::error_condition
     TEST_IGNORE_NODISCARD  x.message();    // returns a std::string
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/nothing_to_do.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/ErrorConditionEnum.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/ErrorConditionEnum.pass.cpp
index fbc03f1aa..63e718dda 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/ErrorConditionEnum.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/ErrorConditionEnum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_condition ec(std::errc::not_a_directory);
         assert(ec.value() == static_cast<int>(std::errc::not_a_directory));
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/default.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/default.pass.cpp
index a430ee2f7..f39904a12 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/default.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::error_condition ec;
     assert(ec.value() == 0);
     assert(ec.category() == std::generic_category());
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/int_error_category.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/int_error_category.pass.cpp
index f3b9eada7..b30c23f19 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/int_error_category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.constructors/int_error_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_condition ec(6, std::system_category());
@@ -28,4 +27,6 @@ int main()
         assert(ec.value() == 8);
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/ErrorConditionEnum.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/ErrorConditionEnum.pass.cpp
index 3773872c7..129e30e3f 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/ErrorConditionEnum.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/ErrorConditionEnum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_condition ec;
@@ -24,4 +23,6 @@ int main()
         assert(ec.value() == static_cast<int>(std::errc::not_enough_memory));
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/assign.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/assign.pass.cpp
index 8fcfcc360..a0e27ee5e 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/assign.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_condition ec;
@@ -30,4 +29,6 @@ int main()
         assert(ec.value() == 8);
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/clear.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/clear.pass.cpp
index 509a8b981..5de51aa95 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/clear.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_condition ec;
@@ -27,4 +26,6 @@ int main()
         assert(ec.value() == 0);
         assert(ec.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/lt.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/lt.pass.cpp
index 7ab063853..f1c24514b 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/lt.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_condition ec1(6, std::generic_category());
         const std::error_condition ec2(7, std::generic_category());
         assert(ec1 < ec2);
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/make_error_condition.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/make_error_condition.pass.cpp
index acefc4655..e9e65db59 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/make_error_condition.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.nonmembers/make_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_condition ec1 = std::make_error_condition(std::errc::message_size);
         assert(ec1.value() == static_cast<int>(std::errc::message_size));
         assert(ec1.category() == std::generic_category());
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/bool.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/bool.pass.cpp
index edeca06d3..bccdf5fb0 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/bool.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_condition ec(6, std::generic_category());
@@ -27,4 +26,6 @@ int main()
         const std::error_condition ec(0, std::generic_category());
         assert(!static_cast<bool>(ec));
     }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/category.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/category.pass.cpp
index fd3e69856..f4710a722 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_condition ec(6, std::generic_category());
     assert(ec.category() == std::generic_category());
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/message.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/message.pass.cpp
index 6a60f50f4..e533e84ee 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/message.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/message.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,8 +16,10 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_condition ec(6, std::generic_category());
     assert(ec.message() == std::generic_category().message(6));
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/value.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/value.pass.cpp
index c75567312..d78b17874 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/value.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.observers/value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_condition ec(6, std::system_category());
     assert(ec.value() == 6);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/types.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/types.pass.cpp
index 62539ab3e..85a0155d7 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/types.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 #include <system_error>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::error_condition x = std::errc(0);
     TEST_IGNORE_NODISCARD  x.category();   // returns a std::error_condition &
     TEST_IGNORE_NODISCARD  x.message();    // returns a std::string
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.hash/enabled_hash.pass.cpp b/test/std/diagnostics/syserr/syserr.hash/enabled_hash.pass.cpp
index f1b460575..c127e900a 100644
--- a/test/std/diagnostics/syserr/syserr.hash/enabled_hash.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.hash/enabled_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
   {
     test_hash_enabled_for_type<std::error_code>();
     test_hash_enabled_for_type<std::error_condition>();
   }
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.hash/error_code.pass.cpp b/test/std/diagnostics/syserr/syserr.hash/error_code.pass.cpp
index dac13bdb8..f8c09775f 100644
--- a/test/std/diagnostics/syserr/syserr.hash/error_code.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.hash/error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,9 +36,11 @@ test(int i)
     ((void)result); // Prevent unused warning
 }
 
-int main()
+int main(int, char**)
 {
     test(0);
     test(2);
     test(10);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.hash/error_condition.pass.cpp b/test/std/diagnostics/syserr/syserr.hash/error_condition.pass.cpp
index eef37c68b..b9b0057b9 100644
--- a/test/std/diagnostics/syserr/syserr.hash/error_condition.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.hash/error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,9 +36,11 @@ test(int i)
     ((void)result); // Prevent unused warning
 }
 
-int main()
+int main(int, char**)
 {
     test(0);
     test(2);
     test(10);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/nothing_to_do.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code.pass.cpp
index c059ba325..3e721c2d2 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::system_error se(static_cast<int>(std::errc::not_a_directory),
                          std::generic_category(), "some text");
     assert(se.code() == std::make_error_code(std::errc::not_a_directory));
     std::string what_message(se.what());
     assert(what_message.find("Not a directory") != std::string::npos);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_const_char_pointer.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_const_char_pointer.pass.cpp
index cd8e3fefb..d15ff75bf 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_const_char_pointer.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_const_char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::string what_arg("test message");
     std::system_error se(make_error_code(std::errc::not_a_directory), what_arg.c_str());
@@ -27,4 +26,6 @@ int main()
     std::string what_message(se.what());
     assert(what_message.find(what_arg) != std::string::npos);
     assert(what_message.find("Not a directory") != std::string::npos);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_string.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_string.pass.cpp
index b891a6d97..8e2b07800 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_string.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_error_code_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::string what_arg("test message");
     std::system_error se(make_error_code(std::errc::not_a_directory), what_arg);
@@ -27,4 +26,6 @@ int main()
     std::string what_message(se.what());
     assert(what_message.find(what_arg) != std::string::npos);
     assert(what_message.find("Not a directory") != std::string::npos);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category.pass.cpp
index acf6387fc..b1ac08e66 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::system_error se(static_cast<int>(std::errc::not_a_directory),
                          std::generic_category());
     assert(se.code() == std::make_error_code(std::errc::not_a_directory));
     std::string what_message(se.what());
     assert(what_message.find("Not a directory") != std::string::npos);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_const_char_pointer.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_const_char_pointer.pass.cpp
index 4f697016c..a6d243267 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_const_char_pointer.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_const_char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::string what_arg("test message");
     std::system_error se(static_cast<int>(std::errc::not_a_directory),
@@ -28,4 +27,6 @@ int main()
     std::string what_message(se.what());
     assert(what_message.find(what_arg) != std::string::npos);
     assert(what_message.find("Not a directory") != std::string::npos);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_string.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_string.pass.cpp
index 87814b190..913c675b9 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_string.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.members/ctor_int_error_category_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::string what_arg("test message");
     std::system_error se(static_cast<int>(std::errc::not_a_directory),
@@ -28,4 +27,6 @@ int main()
     std::string what_message(se.what());
     assert(what_message.find(what_arg) != std::string::npos);
     assert(what_message.find("Not a directory") != std::string::npos);
+
+  return 0;
 }
diff --git a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.overview/nothing_to_do.pass.cpp b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.overview/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.overview/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.syserr/syserr.syserr.overview/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/experimental/algorithms/alg.search/search.pass.cpp b/test/std/experimental/algorithms/alg.search/search.pass.cpp
index 126f7c8a8..45b1f0972 100644
--- a/test/std/experimental/algorithms/alg.search/search.pass.cpp
+++ b/test/std/experimental/algorithms/alg.search/search.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,11 +35,13 @@ struct MySearcher {
 };
 
 
-int main() {
+int main(int, char**) {
     typedef int * RI;
     static_assert((std::is_same<RI, decltype(std::experimental::search(RI(), RI(), MySearcher()))>::value), "" );
 
     RI it(nullptr);
     assert(it == std::experimental::search(it, it, MySearcher()));
     assert(searcher_called == 1);
+
+  return 0;
 }
diff --git a/test/std/experimental/filesystem/fs.req.macros/feature_macro.pass.cpp b/test/std/experimental/filesystem/fs.req.macros/feature_macro.pass.cpp
index c82d558c1..595162d30 100644
--- a/test/std/experimental/filesystem/fs.req.macros/feature_macro.pass.cpp
+++ b/test/std/experimental/filesystem/fs.req.macros/feature_macro.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,4 +25,6 @@
 #endif
 #endif
 
-int main() { }
+int main(int, char**) { 
+  return 0;
+}
diff --git a/test/std/experimental/filesystem/fs.req.namespace/namespace.pass.cpp b/test/std/experimental/filesystem/fs.req.namespace/namespace.pass.cpp
index 77ae7b098..87086d429 100644
--- a/test/std/experimental/filesystem/fs.req.namespace/namespace.pass.cpp
+++ b/test/std/experimental/filesystem/fs.req.namespace/namespace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <experimental/filesystem>
 #include <type_traits>
 
-int main() {
+int main(int, char**) {
   static_assert(std::is_same<
           std::experimental::filesystem::path,
           std::experimental::filesystem::v1::path
       >::value, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/default.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/default.pass.cpp
index ae1b64222..35c5e50bb 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/default.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -122,7 +121,9 @@ test2()
     do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pass.cpp
index 68c786bc7..245b3ddfc 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -118,7 +117,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pred.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pred.pass.cpp
index fe03fa081..ad9095475 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pred.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/hash.pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -136,7 +135,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/pred.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/pred.pass.cpp
index c80ef7968..a361b90b8 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/pred.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore/pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -127,7 +126,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/default.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/default.pass.cpp
index cbf9b41d5..95426f81c 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/default.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -122,7 +121,9 @@ test2()
     do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pass.cpp
index e2d34df82..151a0f46b 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -117,7 +116,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pred.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pred.pass.cpp
index eaa5233d6..bcdaa87c4 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pred.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/hash.pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -130,7 +129,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/pred.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/pred.pass.cpp
index 4e961ec9e..06a93c5d7 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/pred.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.boyer_moore_horspool/pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -124,7 +123,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.default/default.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.default/default.pass.cpp
index 4eaf3a870..b3f6c6638 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.default/default.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.default/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -83,7 +82,7 @@ test()
     do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
 }
 
-int main() {
+int main(int, char**) {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<forward_iterator<const int*>, random_access_iterator<const int*> >();
@@ -93,4 +92,6 @@ int main() {
     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.default/default.pred.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.default/default.pred.pass.cpp
index a2f690d7b..f1573a2e0 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.default/default.pred.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.default/default.pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -90,7 +89,7 @@ test()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<forward_iterator<const int*>, random_access_iterator<const int*> >();
@@ -100,4 +99,6 @@ int main() {
     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pass.cpp
index 7798a6e73..5187569ec 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,7 +67,7 @@ test()
     do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
 }
 
-int main() {
+int main(int, char**) {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<forward_iterator<const int*>, random_access_iterator<const int*> >();
@@ -78,4 +77,6 @@ int main() {
     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pred.pass.cpp b/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pred.pass.cpp
index 21f50a397..a6996437e 100644
--- a/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pred.pass.cpp
+++ b/test/std/experimental/func/func.searchers/func.searchers.default/func.searchers.default.creation/make_default_searcher.pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ test()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<forward_iterator<const int*>, random_access_iterator<const int*> >();
@@ -85,4 +84,6 @@ int main() {
     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
+
+  return 0;
 }
diff --git a/test/std/experimental/func/func.searchers/nothing_to_do.pass.cpp b/test/std/experimental/func/func.searchers/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/experimental/func/func.searchers/nothing_to_do.pass.cpp
+++ b/test/std/experimental/func/func.searchers/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/experimental/func/header.functional.synop/includes.pass.cpp b/test/std/experimental/func/header.functional.synop/includes.pass.cpp
index 1b72d4a7a..4b913c2d7 100644
--- a/test/std/experimental/func/header.functional.synop/includes.pass.cpp
+++ b/test/std/experimental/func/header.functional.synop/includes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 
 #include <experimental/functional>
 
-int main()
+int main(int, char**)
 {
   std::function<int(int)> x;
+
+  return 0;
 }
diff --git a/test/std/experimental/func/nothing_to_do.pass.cpp b/test/std/experimental/func/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/experimental/func/nothing_to_do.pass.cpp
+++ b/test/std/experimental/func/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/experimental/iterator/nothing_to_do.pass.cpp b/test/std/experimental/iterator/nothing_to_do.pass.cpp
index 892d6895a..782c1a03e 100644
--- a/test/std/experimental/iterator/nothing_to_do.pass.cpp
+++ b/test/std/experimental/iterator/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include <experimental/iterator>
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.cons/ostream_joiner.cons.pass.cpp b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.cons/ostream_joiner.cons.pass.cpp
index 0bae57e1b..4e3994f95 100644
--- a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.cons/ostream_joiner.cons.pass.cpp
+++ b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.cons/ostream_joiner.cons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 namespace exp = std::experimental;
 
-int main () {
+int main(int, char**) {
     const char eight = '8';
     const std::string nine = "9";
     const std::wstring ten = L"10";
@@ -55,4 +54,6 @@ int main () {
     { exp::ostream_joiner<std::wstring, wchar_t> oj(std::wcout, ten); }
     { exp::ostream_joiner<int, wchar_t>          oj(std::wcout, eleven); }
 
-    }
+    
+  return 0;
+}
diff --git a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.creation/make_ostream_joiner.pass.cpp b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.creation/make_ostream_joiner.pass.cpp
index a8c1b286f..a2dab9afb 100644
--- a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.creation/make_ostream_joiner.pass.cpp
+++ b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.creation/make_ostream_joiner.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test (Delim &&d, Iter first, Iter last, const CharT *expected ) {
     assert(sstream.str() == expected);
     }
 
-int main () {
+int main(int, char**) {
     const char chars[] = "0123456789";
     const int  ints [] = { 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
 
@@ -50,4 +49,6 @@ int main () {
     test('x', ints,  ints+10,  "10x11x12x13x14x15x16x17x18x19");
     test("Z", chars, chars+10, "0Z1Z2Z3Z4Z5Z6Z7Z8Z9");
     test("z", ints,  ints+10,  "10z11z12z13z14z15z16z17z18z19");
-    }
+    
+  return 0;
+}
diff --git a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.assign.pass.cpp b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.assign.pass.cpp
index 87ab1e271..c1bf74afc 100644
--- a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.assign.pass.cpp
+++ b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,7 +67,7 @@ void test (Delim &&d, Iter first, Iter last, const CharT *expected ) {
     assert(sstream.str() == expected);
     }
 
-int main () {
+int main(int, char**) {
 {
     const char chars[] = "0123456789";
     const int  ints [] = { 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
@@ -117,4 +116,6 @@ int main () {
     test(mutating_delimiter(), chars, chars+10, L"0 1!2\"3#4$5%6&7'8(9");
     }
 
+
+  return 0;
 }
diff --git a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.postincrement.pass.cpp b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.postincrement.pass.cpp
index e3872c3e0..095020eb6 100644
--- a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.postincrement.pass.cpp
+++ b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.postincrement.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test ( exp::ostream_joiner<Delim, CharT, Traits> &oj ) {
     assert( &ret == &oj );
     }
 
-int main () {
+int main(int, char**) {
 
     { exp::ostream_joiner<char>         oj(std::cout, '8');                 test(oj); }
     { exp::ostream_joiner<std::string>  oj(std::cout, std::string("9"));    test(oj); }
@@ -43,4 +42,6 @@ int main () {
     { exp::ostream_joiner<std::string, wchar_t>  oj(std::wcout, std::string("9"));    test(oj); }
     { exp::ostream_joiner<std::wstring, wchar_t> oj(std::wcout, std::wstring(L"10")); test(oj); }
     { exp::ostream_joiner<int, wchar_t>          oj(std::wcout, 11);                  test(oj); }
-    }
+    
+  return 0;
+}
diff --git a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.pretincrement.pass.cpp b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.pretincrement.pass.cpp
index 87b493e63..2e305c2ff 100644
--- a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.pretincrement.pass.cpp
+++ b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.pretincrement.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test ( exp::ostream_joiner<Delim, CharT, Traits> &oj ) {
     assert( &ret == &oj );
     }
 
-int main () {
+int main(int, char**) {
 
     { exp::ostream_joiner<char>         oj(std::cout, '8');                 test(oj); }
     { exp::ostream_joiner<std::string>  oj(std::cout, std::string("9"));    test(oj); }
@@ -43,4 +42,6 @@ int main () {
     { exp::ostream_joiner<std::string, wchar_t>  oj(std::wcout, std::string("9"));    test(oj); }
     { exp::ostream_joiner<std::wstring, wchar_t> oj(std::wcout, std::wstring(L"10")); test(oj); }
     { exp::ostream_joiner<int, wchar_t>          oj(std::wcout, 11);                  test(oj); }
-    }
+    
+  return 0;
+}
diff --git a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.star.pass.cpp b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.star.pass.cpp
index 794346d75..74bf9c309 100644
--- a/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.star.pass.cpp
+++ b/test/std/experimental/iterator/ostream.joiner/ostream.joiner.ops/ostream_joiner.op.star.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test ( exp::ostream_joiner<Delim, CharT, Traits> &oj ) {
     assert( &ret == &oj );
     }
 
-int main () {
+int main(int, char**) {
 
     { exp::ostream_joiner<char>         oj(std::cout, '8');                 test(oj); }
     { exp::ostream_joiner<std::string>  oj(std::cout, std::string("9"));    test(oj); }
@@ -43,4 +42,6 @@ int main () {
     { exp::ostream_joiner<std::string, wchar_t>  oj(std::wcout, std::string("9"));    test(oj); }
     { exp::ostream_joiner<std::wstring, wchar_t> oj(std::wcout, std::wstring(L"10")); test(oj); }
     { exp::ostream_joiner<int, wchar_t>          oj(std::wcout, 11);                  test(oj); }
-    }
+    
+  return 0;
+}
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp
index 30081fc3a..b3fbd2763 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,8 +50,10 @@ void do_test() {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test<coro::coroutine_handle<>>();
   do_test<coro::coroutine_handle<int>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp
index 278ea9d06..f6290fdfa 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/equal_comp.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ void do_test(uintptr_t LHSVal, uintptr_t RHSVal) {
   }
 }
 
-int main()
+int main(int, char**)
 {
   std::pair<uintptr_t, uintptr_t> const TestCases[] = {
       {0, 0},
@@ -57,4 +56,6 @@ int main()
     do_test<coro::coroutine_handle<>>(TC.first, TC.second);
     do_test<coro::coroutine_handle<int>>(TC.first, TC.second);
   }
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp
index e92adf033..8152b53f9 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.compare/less_comp.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ void do_test(uintptr_t LHSVal, uintptr_t RHSVal) {
   }
 }
 
-int main()
+int main(int, char**)
 {
   std::pair<uintptr_t, uintptr_t> const TestCases[] = {
       {0, 0},
@@ -66,4 +65,6 @@ int main()
     do_test<coro::coroutine_handle<>>(TC.first, TC.second);
     do_test<coro::coroutine_handle<int>>(TC.first, TC.second);
   }
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp
index 240d93245..14ac3976e 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.completion/done.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,8 +36,10 @@ void do_test(coro::coroutine_handle<Promise> const& H) {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test(coro::coroutine_handle<>{});
   do_test(coro::coroutine_handle<int>{});
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp
index 0cd3d05c2..2af0b717e 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/assign.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,8 +46,10 @@ void do_test() {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test<coro::coroutine_handle<>>();
   do_test<coro::coroutine_handle<int>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp
index be5174dd3..7832856c1 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.con/construct.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,8 +45,10 @@ void do_test() {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test<coro::coroutine_handle<>>();
   do_test<coro::coroutine_handle<int>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp
index aba5eb663..3c63dbbeb 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/address.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,8 +43,10 @@ void do_test() {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test<coro::coroutine_handle<>>();
   do_test<coro::coroutine_handle<int>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.fail.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.fail.cpp
index 1c87b9443..e9dd0678f 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.fail.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 
 namespace coro = std::experimental;
 
-int main()
+int main(int, char**)
 {
   {
     using H = coro::coroutine_handle<>;
@@ -43,4 +42,6 @@ int main()
     // expected-error@experimental/coroutine:* 1 {{coroutine_handle<promise_type>::from_address cannot be called with non-void pointers}}
     H::from_address((int*)nullptr); // expected-note {{requested here}}
   }
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp
index 636d5da4e..9c4a647e5 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.export/from_address.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,8 +38,10 @@ void do_test() {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test<coro::coroutine_handle<>>();
   do_test<coro::coroutine_handle<int>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
index 342232962..612380b6d 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.hash/hash.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ void do_test(uintptr_t LHSVal, uintptr_t RHSVal) {
   }
 }
 
-int main()
+int main(int, char**)
 {
   std::pair<uintptr_t, uintptr_t> const TestCases[] = {
       {0, 0},
@@ -60,4 +59,6 @@ int main()
     do_test<coro::coroutine_handle<>>(TC.first, TC.second);
     do_test<coro::coroutine_handle<int>>(TC.first, TC.second);
   }
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp
index 030e7af07..27b83ce02 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.noop/noop_coroutine.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ static_assert(std::is_same<decltype(coro::noop_coroutine()), coro::noop_coroutin
 // // 18.11.2.10 noop address
 // constexpr void* address() const noexcept;
 
-int main()
+int main(int, char**)
 {
   auto h = coro::noop_coroutine();
   coro::coroutine_handle<> base = h;
@@ -66,10 +65,12 @@ int main()
   assert(h.address() == base.address());
   assert(h.address() != nullptr);
   assert(coro::coroutine_handle<>::from_address(h.address()) == base);
+
+  return 0;
 }
 
 #else
 
-int main() {}
+int main(int, char**) { return 0; }
 
 #endif //  __has_builtin(__builtin_coro_noop)
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp
index f996886c4..0f81fdca8 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.prom/promise.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,9 +75,11 @@ void do_test(coro::coroutine_handle<Promise>&& H) {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test(coro::coroutine_handle<int>{});
   do_test(coro::coroutine_handle<const int>{});
   do_runtime_test();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp
index df3337c4c..72ba9fee6 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/destroy.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,8 +53,10 @@ void do_test(coro::coroutine_handle<Promise>&& H) {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test(coro::coroutine_handle<>{});
   do_test(coro::coroutine_handle<int>{});
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp
index 21c05e2be..a3804ae43 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.resumption/resume.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,8 +72,10 @@ void do_test(coro::coroutine_handle<Promise>&& H) {
   }
 }
 
-int main()
+int main(int, char**)
 {
   do_test(coro::coroutine_handle<>{});
   do_test(coro::coroutine_handle<int>{});
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp
index 844d34cc4..8536e23d4 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.handle/void_handle.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,10 +41,12 @@ void check_type() {
   static_assert(std::is_same<P, Expect>::value, "");
 };
 
-int main()
+int main(int, char**)
 {
   check_type<A*, A>();
   check_type<int*, A, int>();
   check_type<B*, B>();
   check_type<void, C>();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp
index e26f333aa..781f264ff 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.traits/promise_type.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ void check_no_type() {
   static_assert(!has_promise_type<Traits>(), "");
 }
 
-int main()
+int main(int, char**)
 {
   {
     check_type<A*, A>();
@@ -74,4 +73,6 @@ int main()
     check_no_type<E>();
     check_no_type<C, int>();
   }
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp
index b10e72082..89f1619df 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_always.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ constexpr bool check_suspend_constexpr() {
   return true;
 }
 
-int main()
+int main(int, char**)
 {
   using H = coro::coroutine_handle<>;
   using S = SuspendT;
@@ -70,4 +69,6 @@ int main()
     // suppress unused warnings for the global constexpr test variable
     ((void)constexpr_sa);
   }
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp b/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp
index 9c2f39238..7986b2926 100644
--- a/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/coroutine.trivial.awaitables/suspend_never.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ constexpr bool check_suspend_constexpr() {
 }
 
 
-int main()
+int main(int, char**)
 {
   using H = coro::coroutine_handle<>;
   using S = SuspendT;
@@ -72,4 +71,6 @@ int main()
     // suppress unused warnings for the global constexpr test variable
     ((void)constexpr_sn);
   }
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/await_result.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/await_result.pass.cpp
index b8606317a..c540ca9fb 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/await_result.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/await_result.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,10 +59,12 @@ coro_t f(int n) {
 
 coro_t g() { B val = co_await B{}; }
 
-int main() {
+int main(int, char**) {
   last_value = -1;
   f(0);
   assert(last_value == 0);
   f(1);
   assert(last_value == 42);
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
index 12ab92ff3..fb15ade8b 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ coro_t g() {
   g_resumed = true;
 }
 
-int main() {
+int main(int, char**) {
   assert(!f_started && !f_resumed && !g_started && !g_resumed);
   auto fret = f();
   assert(f_started && !f_resumed);
@@ -66,4 +65,6 @@ int main() {
   assert(f_started && !f_resumed);
   g();
   assert(g_started && g_resumed);
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/expected.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/expected.pass.cpp
index 77070cc5a..a899092d0 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/expected.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/expected.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,7 +75,7 @@ expected<int> f2() {
   co_return 200;
 }
 
-int main() {
+int main(int, char**) {
   auto c1 = f1();
   assert(f1_started && f1_resumed);
   assert(c1.value() == 100);
@@ -86,4 +85,6 @@ int main() {
   assert(f2_started && !f2_resumed);
   assert(c2.value() == 0);
   assert(c2.error() == 42);
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp
index 83c9da66d..87d3c8f9d 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/fullexpr-dtor.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -109,9 +108,11 @@ coro2 d() {
   assert(dtor_called == 1);
 }
 
-int main() {
+int main(int, char**) {
   a();
   b();
   c();
   d();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
index c92e26184..84b4deb9c 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -96,8 +95,10 @@ void test_mini_generator() {
   assert(sum == 10);
 }
 
-int main() {
+int main(int, char**) {
   test_count();
   test_range();
   test_mini_generator();
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/go.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/go.pass.cpp
index 1fdf2c855..994bd87d6 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/go.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/go.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -165,7 +164,7 @@ goroutine pusher(channel& left, channel& right)
 const int N = 100;
 channel* c = new channel[N + 1];
 
-int main() {
+int main(int, char**) {
   for (int i = 0; i < N; ++i)
     goroutine::go(pusher(c[i], c[i + 1]));
 
@@ -173,4 +172,6 @@ int main() {
   int result = c[N].sync_pull();
 
   assert(result == 100);
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp
index e3c965303..fed97ea23 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/multishot_func.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -81,7 +80,9 @@ int Do(int acc, int n, func<int> f) {
   return acc;
 }
 
-int main() {
+int main(int, char**) {
   int result = Do(1, 10, [](int a, int b) {return a + b;});
   assert(result == 46);
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp
index ae0a950dc..4bab2dd3b 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/oneshot_func.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,11 +72,13 @@ float fyield(int x) { yielded_values.push_back(x); return static_cast<float>(x +
 void Do1(func<int> f) { yield(f()); }
 void Do2(func<double> f) { yield(static_cast<int>(f())); }
 
-int main() {
+int main(int, char**) {
   Do1([] { return yield(43); });
   assert((yielded_values == std::vector<int>{43, 44}));
 
   yielded_values = {};
   Do2([] { return fyield(44); });
   assert((yielded_values == std::vector<int>{44, 46}));
+
+  return 0;
 }
diff --git a/test/std/experimental/language.support/support.coroutines/includes.pass.cpp b/test/std/experimental/language.support/support.coroutines/includes.pass.cpp
index b30d8c7ed..440ffa113 100644
--- a/test/std/experimental/language.support/support.coroutines/includes.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/includes.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,11 @@
 
 #include <experimental/coroutine>
 
-int main(){
+int main(int, char**) {
   // std::nothrow is not implicitly defined by the compiler when the include is
   // missing, unlike other parts of <new>. Therefore we use std::nothrow to
   // test for #include <new>
   (void)std::nothrow;
 
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/assign.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/assign.pass.cpp
index c4309d909..35a98b789 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/assign.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,9 +20,11 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<void> T;
     static_assert(!std::is_copy_assignable<T>::value, "");
     static_assert(!std::is_move_assignable<T>::value, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/copy.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/copy.pass.cpp
index ba3710d4d..ce3c9be10 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/copy.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<void> A1;
     {
@@ -45,4 +44,6 @@ int main()
         assert(a.resource() == a2.resource());
         assert(a2.resource() == (ex::memory_resource*)42);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
index b696d0c13..6a60021e5 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     {
         static_assert(
@@ -46,4 +45,6 @@ int main()
         assert(a.resource() == &R1);
         assert(a2.resource() == ex::new_delete_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/memory_resource_convert.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/memory_resource_convert.pass.cpp
index 19d9646ad..77748ea12 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/memory_resource_convert.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/memory_resource_convert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     {
         typedef ex::polymorphic_allocator<void> A;
@@ -42,4 +41,6 @@ int main()
         A const a(&R);
         assert(a.resource() == &R);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/other_alloc.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/other_alloc.pass.cpp
index aadfbcc32..21a56f67b 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/other_alloc.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.ctor/other_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<void> A1;
     typedef ex::polymorphic_allocator<char> A2;
@@ -54,4 +53,6 @@ int main()
         assert(a.resource() == a2.resource());
         assert(a2.resource() == (ex::memory_resource*)42);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
index d4aea1cf5..6877885a7 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<void> A1;
     typedef ex::polymorphic_allocator<int> A2;
@@ -131,4 +130,6 @@ int main()
         assert(d1.checkIsEqualCalledEq(0));
         assert(d2.checkIsEqualCalledEq(1));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
index 7b9b1d385..39bc3e28f 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.eq/not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<void> A1;
     typedef ex::polymorphic_allocator<int> A2;
@@ -102,4 +101,6 @@ int main()
         assert(d1.checkIsEqualCalledEq(0));
         assert(d2.checkIsEqualCalledEq(1));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
index a7efad115..ce9c82fb4 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/allocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -81,7 +80,7 @@ void testAllocForSizeThrows() {
 }
 #endif // TEST_HAS_NO_EXCEPTIONS
 
-int main()
+int main(int, char**)
 {
     {
         ex::polymorphic_allocator<int> a;
@@ -109,4 +108,6 @@ int main()
         testAllocForSizeThrows<13>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
index 2b4359475..739d95126 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct default_constructible
     int x{0};
 };
 
-int main()
+int main(int, char**)
 {
     // pair<default_constructible, default_constructible> as T()
     {
@@ -50,4 +49,6 @@ int main()
         assert(ptr->second.x == 42);
         std::free(ptr);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
index 666d8f780..862657a31 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_const_lvalue_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -119,7 +118,7 @@ void test_pmr_not_uses_allocator(std::pair<TT, UU> const& p)
 template <class Tp>
 struct Print;
 
-int main()
+int main(int, char**)
 {
     using ERT = std::experimental::erased_type;
     using PMR = ex::memory_resource*;
@@ -140,4 +139,6 @@ int main()
         test_pmr_not_uses_allocator<PMR>(p);
         test_pmr_uses_allocator<PMA>(p);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
index 9e316991c..479587ed0 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -115,7 +114,7 @@ void test_pmr_not_uses_allocator(std::pair<TT, UU>&& p)
     }
 }
 
-int main()
+int main(int, char**)
 {
     using ERT = std::experimental::erased_type;
     using PMR = ex::memory_resource*;
@@ -136,4 +135,6 @@ int main()
         test_pmr_not_uses_allocator<PMR>(std::move(p));
         test_pmr_uses_allocator<PMA>(std::move(p));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
index f2f7712a4..9f558581a 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_pair_values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -122,7 +121,7 @@ void test_pmr_not_uses_allocator(TT&& t, UU&& u)
     }
 }
 
-int main()
+int main(int, char**)
 {
     using ERT = std::experimental::erased_type;
     using PMR = ex::memory_resource*;
@@ -141,4 +140,6 @@ int main()
         test_pmr_not_uses_allocator<PMR>(std::move(x), y);
         test_pmr_uses_allocator<PMA>(std::move(x), y);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
index 27807c1f4..91f315468 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -112,7 +111,7 @@ void test_pmr_not_uses_allocator(std::tuple<TTypes...> ttuple, std::tuple<UTypes
     }
 }
 
-int main()
+int main(int, char**)
 {
     using ERT = std::experimental::erased_type;
     using PMR = ex::memory_resource*;
@@ -160,4 +159,6 @@ int main()
         test_pmr_uses_allocator<PMA>(           t1, std::move(t2));
         test_pmr_uses_allocator<PMA>(std::move(t2),            t1);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
index 7dc8f3aac..4f30d13c8 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_piecewise_pair_evil.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -121,7 +120,7 @@ void test_evil()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_evil<WidgetV0, WidgetV0>();
     test_evil<WidgetV0, WidgetV1>();
@@ -139,4 +138,6 @@ int main()
     test_evil<WidgetV3, WidgetV1>();
     test_evil<WidgetV3, WidgetV2>();
     test_evil<WidgetV3, WidgetV3>();
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
index a619194fe..526988199 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/construct_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -188,7 +187,7 @@ void test_non_pmr_uses_alloc(AllocObj const& A, Args&&... args)
     }
 }
 
-int main()
+int main(int, char**)
 {
     using ET = std::experimental::erased_type;
     using PMR = ex::memory_resource*;
@@ -224,4 +223,6 @@ int main()
         test_non_pmr_uses_alloc<STDA>(std_alloc, cvalue, std::move(value));
         test_non_pmr_uses_alloc<TESTA>(test_alloc, cvalue, std::move(value));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
index d60c2f2d9..022478da7 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/deallocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ void testForSizeAndAlign() {
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         ex::polymorphic_allocator<int> a;
@@ -59,4 +58,6 @@ int main()
         testForSizeAndAlign<73, MA>();
         testForSizeAndAlign<13, MA>();
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
index 5d907660d..0a1b60dc2 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/destroy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct destroyable
     ~destroyable() { --count; }
 };
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<double> A;
     {
@@ -49,4 +48,6 @@ int main()
         assert(count == 0);
         std::free(ptr);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
index b59606b9e..b05f2b292 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/resource.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<void> A;
     {
@@ -54,4 +53,6 @@ int main()
         assert(a.resource() == mptr);
         assert(a.resource() == ex::get_default_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
index 353fcafed..92beab473 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.mem/select_on_container_copy_construction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::polymorphic_allocator<void> A;
     {
@@ -50,4 +49,6 @@ int main()
         assert(other.resource() == mptr);
         assert(a.resource() == nullptr);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.overview/nothing_to_do.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.overview/nothing_to_do.pass.cpp
index 86bf8cc11..796f3c353 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.overview/nothing_to_do.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/memory.polymorphic.allocator.overview/nothing_to_do.pass.cpp
@@ -1,10 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/memory/memory.polymorphic.allocator.class/nothing_to_do.pass.cpp b/test/std/experimental/memory/memory.polymorphic.allocator.class/nothing_to_do.pass.cpp
index 86bf8cc11..796f3c353 100644
--- a/test/std/experimental/memory/memory.polymorphic.allocator.class/nothing_to_do.pass.cpp
+++ b/test/std/experimental/memory/memory.polymorphic.allocator.class/nothing_to_do.pass.cpp
@@ -1,10 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_copy.pass.cpp b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_copy.pass.cpp
index 4de30bccb..4466b2b4e 100644
--- a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_copy.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef CountingAllocator<char> AllocT;
     typedef ex::resource_adaptor<AllocT> R;
@@ -50,4 +49,6 @@ int main()
         assert(P.move_constructed == 0);
         assert(r.get_allocator() == a);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_move.pass.cpp b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_move.pass.cpp
index f3ecc98ee..b6af85151 100644
--- a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_move.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/alloc_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef CountingAllocator<char> AllocT;
     typedef ex::resource_adaptor<AllocT> R;
@@ -41,4 +40,6 @@ int main()
         assert(P.move_constructed == 1);
         assert(r.get_allocator() == AllocT{P});
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/default.pass.cpp b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/default.pass.cpp
index 4abc69f0b..53481ab39 100644
--- a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/default.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.ctor/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     {
         typedef CountingAllocator<char> AllocT; // Not default constructible
@@ -37,4 +36,6 @@ int main()
         static_assert(std::is_default_constructible<R>::value, "");
         R r; ((void)r);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_allocate_and_deallocate.pass.cpp b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_allocate_and_deallocate.pass.cpp
index 16b726975..806fa6e95 100644
--- a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_allocate_and_deallocate.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_allocate_and_deallocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -107,9 +106,11 @@ void check_alloc_max_size() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     check_allocate_deallocate<CountingAllocator<char>>();
     check_allocate_deallocate<MinAlignedAllocator<char>>();
     check_alloc_max_size();
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_is_equal.pass.cpp b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_is_equal.pass.cpp
index ff4b3179a..71c36693c 100644
--- a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_is_equal.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.mem/do_is_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 using std::size_t;
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
 
     typedef CountingAllocator<char> Alloc1;
@@ -80,4 +79,6 @@ int main()
         assert(!m1.is_equal(m2));
         assert(!m2.is_equal(m1));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.overview/overview.pass.cpp b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.overview/overview.pass.cpp
index 898543fbc..873dfd939 100644
--- a/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.overview/overview.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.adaptor/memory.resource.adaptor.overview/overview.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     typedef ex::resource_adaptor<std::allocator<void>> R;
     typedef ex::resource_adaptor<std::allocator<long>> R2;
@@ -36,4 +35,6 @@ int main()
         static_assert(std::is_copy_assignable<R>::value, "");
         static_assert(std::is_move_assignable<R>::value, "");
    }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
index 5654a785a..2aba4431e 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_deque_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,11 +26,13 @@
 
 namespace pmr = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using StdDeque = std::deque<int, pmr::polymorphic_allocator<int>>;
     using PmrDeque = pmr::deque<int>;
     static_assert(std::is_same<StdDeque, PmrDeque>::value, "");
     PmrDeque d;
     assert(d.get_allocator().resource() == pmr::get_default_resource());
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
index e834be391..66adb0b51 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_forward_list_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,11 +26,13 @@
 
 namespace pmr = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using StdForwardList = std::forward_list<int, pmr::polymorphic_allocator<int>>;
     using PmrForwardList = pmr::forward_list<int>;
     static_assert(std::is_same<StdForwardList, PmrForwardList>::value, "");
     PmrForwardList d;
     assert(d.get_allocator().resource() == pmr::get_default_resource());
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
index a53b528e8..2884a3fbb 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_list_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,11 +26,13 @@
 
 namespace pmr = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using StdList = std::list<int, pmr::polymorphic_allocator<int>>;
     using PmrList = pmr::list<int>;
     static_assert(std::is_same<StdList, PmrList>::value, "");
     PmrList d;
     assert(d.get_allocator().resource() == pmr::get_default_resource());
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
index 4996d4e6d..5b221c539 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_map_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 
 namespace pmr = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using K = int;
     using V = char;
@@ -66,4 +65,6 @@ int main()
         pmr::multimap<int, int> m;
         assert(m.get_allocator().resource() == pmr::get_default_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
index f371c8a52..95f6d6f0c 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_regex_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ void test_match_result_typedef() {
     static_assert(std::is_same<PmrMR, PmrTypedef>::value, "");
 }
 
-int main()
+int main(int, char**)
 {
     {
         test_match_result_typedef<const char*, pmr::cmatch>();
@@ -54,4 +53,6 @@ int main()
         pmr::smatch s;
         assert(s.get_allocator().resource() == pmr::get_default_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
index 3af1d7005..4ee12d61a 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_set_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 
 namespace pmr = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using V = char;
     using DC = std::less<V>;
@@ -64,4 +63,6 @@ int main()
         pmr::multiset<int> m;
         assert(m.get_allocator().resource() == pmr::get_default_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
index 21889c2da..3a730fafe 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_string_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ void test_basic_string_alias() {
     static_assert(std::is_same<StdStr, PmrStr>::value, "");
 }
 
-int main()
+int main(int, char**)
 {
     {
         test_string_typedef<char,     pmr::string>();
@@ -70,4 +69,6 @@ int main()
         pmr::string s;
         assert(s.get_allocator().resource() == pmr::get_default_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
index 99c928b7a..8b07d68a0 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_unordered_map_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct MyHash : std::hash<T> {};
 template <class T>
 struct MyPred : std::equal_to<T> {};
 
-int main()
+int main(int, char**)
 {
     using K = int;
     using V = char;
@@ -84,4 +83,6 @@ int main()
         pmr::unordered_multimap<int, int> m;
         assert(m.get_allocator().resource() == pmr::get_default_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
index d427fe7c4..c4238dee1 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_unordered_set_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct MyHash : std::hash<T> {};
 template <class T>
 struct MyPred : std::equal_to<T> {};
 
-int main()
+int main(int, char**)
 {
     using V = char;
     using DH = std::hash<V>;
@@ -82,4 +81,6 @@ int main()
         pmr::unordered_multiset<int> m;
         assert(m.get_allocator().resource() == pmr::get_default_resource());
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp b/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
index 7dfd3b820..a5c0e8bbd 100644
--- a/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.aliases/header_vector_synop.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,11 +26,13 @@
 
 namespace pmr = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     using StdVector = std::vector<int, pmr::polymorphic_allocator<int>>;
     using PmrVector = pmr::vector<int>;
     static_assert(std::is_same<StdVector, PmrVector>::value, "");
     PmrVector d;
     assert(d.get_allocator().resource() == pmr::get_default_resource());
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp b/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
index 7aa16ab50..c3bf1a2fc 100644
--- a/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.global/default_resource.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@
 
 using namespace std::experimental::pmr;
 
-int main() {
+int main(int, char**) {
     TestResource R;
     { // Test (A) and (B)
         memory_resource* p = get_default_resource();
@@ -71,4 +70,6 @@ int main() {
         static_assert(noexcept(set_default_resource(nullptr)),
                       "set_default_resource() must be noexcept");
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp b/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
index 412e3323d..da340d7a0 100644
--- a/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.global/new_delete_resource.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -93,10 +92,12 @@ void test_allocate_deallocate()
 
 }
 
-int main()
+int main(int, char**)
 {
     static_assert(noexcept(ex::new_delete_resource()), "Must be noexcept");
     test_return();
     test_equality();
     test_allocate_deallocate();
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp b/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
index f263df30e..f7111b493 100644
--- a/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.global/null_memory_resource.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -109,10 +108,12 @@ void test_deallocate()
     assert(globalMemCounter.checkDeleteArrayCalledEq(0));
 }
 
-int main()
+int main(int, char**)
 {
     test_return();
     test_equality();
     test_allocate();
     test_deallocate();
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource.synop/nothing_to_do.pass.cpp b/test/std/experimental/memory/memory.resource.synop/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/experimental/memory/memory.resource.synop/nothing_to_do.pass.cpp
+++ b/test/std/experimental/memory/memory.resource.synop/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/construct.fail.cpp b/test/std/experimental/memory/memory.resource/construct.fail.cpp
index d990714ac..f4d57be8d 100644
--- a/test/std/experimental/memory/memory.resource/construct.fail.cpp
+++ b/test/std/experimental/memory/memory.resource/construct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     ex::memory_resource m; // expected-error {{variable type 'ex::memory_resource' is an abstract class}}
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.eq/equal.pass.cpp b/test/std/experimental/memory/memory.resource/memory.resource.eq/equal.pass.cpp
index 0ccdeed3c..f9d4d5beb 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.eq/equal.pass.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.eq/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     // check return types
     {
@@ -73,4 +72,6 @@ int main()
         assert(r1.checkIsEqualCalledEq(1));
         assert(r2.checkIsEqualCalledEq(1));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.eq/not_equal.pass.cpp b/test/std/experimental/memory/memory.resource/memory.resource.eq/not_equal.pass.cpp
index ede1bfdf9..037bb1a96 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.eq/not_equal.pass.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.eq/not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 namespace ex = std::experimental::pmr;
 
-int main()
+int main(int, char**)
 {
     // check return types
     {
@@ -72,4 +71,6 @@ int main()
         assert(!(mr2 != mr1));
         assert(r1.checkIsEqualCalledEq(0));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.overview/nothing_to_do.pass.cpp b/test/std/experimental/memory/memory.resource/memory.resource.overview/nothing_to_do.pass.cpp
index 86bf8cc11..796f3c353 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.overview/nothing_to_do.pass.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.overview/nothing_to_do.pass.cpp
@@ -1,10 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.priv/protected_members.fail.cpp b/test/std/experimental/memory/memory.resource/memory.resource.priv/protected_members.fail.cpp
index 8cce9d293..faa3a252e 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.priv/protected_members.fail.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.priv/protected_members.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 
 namespace ex = std::experimental::pmr;
 
-int main() {
+int main(int, char**) {
     ex::memory_resource *m = ex::new_delete_resource();
     m->do_allocate(0, 0); // expected-error{{'do_allocate' is a protected member}}
     m->do_deallocate(nullptr, 0, 0); // expected-error{{'do_deallocate' is a protected member}}
     m->do_is_equal(*m); // expected-error{{'do_is_equal' is a protected member}}
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.public/allocate.pass.cpp b/test/std/experimental/memory/memory.resource/memory.resource.public/allocate.pass.cpp
index efb529b3c..38f49743c 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.public/allocate.pass.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.public/allocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 
 using std::experimental::pmr::memory_resource;
 
-int main()
+int main(int, char**)
 {
     TestResource R(42);
     auto& P = R.getController();
@@ -86,4 +85,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.public/deallocate.pass.cpp b/test/std/experimental/memory/memory.resource/memory.resource.public/deallocate.pass.cpp
index d1a4ab2b8..e8c2d5bff 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.public/deallocate.pass.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.public/deallocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 
 using std::experimental::pmr::memory_resource;
 
-int main()
+int main(int, char**)
 {
     NullResource R(42);
     auto& P = R.getController();
@@ -71,4 +70,6 @@ int main()
         assert(P.dealloc_count == 2);
         assert(P.checkDealloc(p, s, a));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.public/dtor.pass.cpp b/test/std/experimental/memory/memory.resource/memory.resource.public/dtor.pass.cpp
index 9e1d28618..be5ea2fb0 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.public/dtor.pass.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.public/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 
 using std::experimental::pmr::memory_resource;
 
-int main()
+int main(int, char**)
 {
     static_assert(
         std::has_virtual_destructor<memory_resource>::value
@@ -56,4 +55,6 @@ int main()
         assert(TR::resource_constructed == 1);
         assert(TR::resource_destructed == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/memory.resource/memory.resource.public/is_equal.pass.cpp b/test/std/experimental/memory/memory.resource/memory.resource.public/is_equal.pass.cpp
index 32792cf86..f0e517870 100644
--- a/test/std/experimental/memory/memory.resource/memory.resource.public/is_equal.pass.cpp
+++ b/test/std/experimental/memory/memory.resource/memory.resource.public/is_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 
 using std::experimental::pmr::memory_resource;
 
-int main()
+int main(int, char**)
 {
     {
         memory_resource const* r1 = nullptr;
@@ -90,4 +89,6 @@ int main()
         assert(P2.checkIsEqualCalledEq(1));
         assert(P1.checkIsEqualCalledEq(1));
     }
+
+  return 0;
 }
diff --git a/test/std/experimental/memory/nothing_to_do.pass.cpp b/test/std/experimental/memory/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/experimental/memory/nothing_to_do.pass.cpp
+++ b/test/std/experimental/memory/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/experimental/nothing_to_do.pass.cpp b/test/std/experimental/nothing_to_do.pass.cpp
index 86bf8cc11..796f3c353 100644
--- a/test/std/experimental/nothing_to_do.pass.cpp
+++ b/test/std/experimental/nothing_to_do.pass.cpp
@@ -1,10 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp b/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp
index dd8436618..6bd56d2dd 100644
--- a/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp
+++ b/test/std/experimental/simd/simd.abi/vector_extension.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,4 +63,6 @@ static_assert(std::is_same<ex::simd_abi::compatible<int8_t>,
                            ex::__simd_abi<ex::_StorageKind::_Array, 16>>::value,
               "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.access/default.pass.cpp b/test/std/experimental/simd/simd.access/default.pass.cpp
index d799675a9..6e6e4fe9e 100644
--- a/test/std/experimental/simd/simd.access/default.pass.cpp
+++ b/test/std/experimental/simd/simd.access/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -211,7 +210,9 @@ void test_access() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_access<ex::native_simd<int>>();
   test_access<ex::fixed_size_simd<int, 4>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp b/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp
index d15f138d5..ec4a32bf9 100644
--- a/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp
+++ b/test/std/experimental/simd/simd.casts/simd_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,4 +42,6 @@ static_assert(
         ex::simd<int64_t, ex::simd_abi::scalar>>::value,
     "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.casts/static_simd_cast.pass.cpp b/test/std/experimental/simd/simd.casts/static_simd_cast.pass.cpp
index b73466477..40922ce11 100644
--- a/test/std/experimental/simd/simd.casts/static_simd_cast.pass.cpp
+++ b/test/std/experimental/simd/simd.casts/static_simd_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,4 +37,6 @@ static_assert(
         ex::simd<float, ex::simd_abi::scalar>>::value,
     "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.cons/broadcast.pass.cpp b/test/std/experimental/simd/simd.cons/broadcast.pass.cpp
index 49b2b5572..25dd8a4c5 100644
--- a/test/std/experimental/simd/simd.cons/broadcast.pass.cpp
+++ b/test/std/experimental/simd/simd.cons/broadcast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -79,8 +78,10 @@ void test_broadcast() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_broadcast<ex::native_simd<int>>();
   test_broadcast<ex::fixed_size_simd<int, 4>>();
   test_broadcast<ex::fixed_size_simd<int, 15>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/simd/simd.cons/default.pass.cpp b/test/std/experimental/simd/simd.cons/default.pass.cpp
index 0f12eced0..6eebe0ec0 100644
--- a/test/std/experimental/simd/simd.cons/default.pass.cpp
+++ b/test/std/experimental/simd/simd.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,10 +18,12 @@
 
 namespace ex = std::experimental::parallelism_v2;
 
-int main() {
+int main(int, char**) {
   static_assert(ex::native_simd<int32_t>().size() > 0, "");
   static_assert(ex::fixed_size_simd<int32_t, 4>().size() == 4, "");
   static_assert(ex::fixed_size_simd<int32_t, 5>().size() == 5, "");
   static_assert(ex::fixed_size_simd<int32_t, 1>().size() == 1, "");
   static_assert(ex::fixed_size_simd<char, 32>().size() == 32, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/simd/simd.cons/generator.pass.cpp b/test/std/experimental/simd/simd.cons/generator.pass.cpp
index 43273e896..19880e9d3 100644
--- a/test/std/experimental/simd/simd.cons/generator.pass.cpp
+++ b/test/std/experimental/simd/simd.cons/generator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -83,9 +82,11 @@ void test_generator() {
   }
 }
 
-int main() {
+int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
   assert(ex::native_simd<int32_t>::size() >= 4);
   test_generator<ex::native_simd<int32_t>>();
   test_generator<ex::fixed_size_simd<int32_t, 4>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/simd/simd.cons/load.pass.cpp b/test/std/experimental/simd/simd.cons/load.pass.cpp
index 8c87fe7a5..9440d5aef 100644
--- a/test/std/experimental/simd/simd.cons/load.pass.cpp
+++ b/test/std/experimental/simd/simd.cons/load.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -108,11 +107,13 @@ void test_converting_load_ctor() {
   assert(a[3] == 8);
 }
 
-int main() {
+int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
   assert(ex::native_simd<int32_t>::size() >= 4);
   test_load_ctor<ex::native_simd<int32_t>>();
   test_load_ctor<ex::fixed_size_simd<int32_t, 4>>();
   test_converting_load_ctor<ex::native_simd<int32_t>>();
   test_converting_load_ctor<ex::fixed_size_simd<int32_t, 4>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/simd/simd.mem/load.pass.cpp b/test/std/experimental/simd/simd.mem/load.pass.cpp
index b1a3a2b1d..1a56161c5 100644
--- a/test/std/experimental/simd/simd.mem/load.pass.cpp
+++ b/test/std/experimental/simd/simd.mem/load.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -112,11 +111,13 @@ void test_converting_load() {
   assert(a[3] == 8);
 }
 
-int main() {
+int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
   assert(ex::native_simd<int32_t>::size() >= 4);
   test_load<ex::native_simd<int32_t>>();
   test_load<ex::fixed_size_simd<int32_t, 4>>();
   test_converting_load<ex::native_simd<int32_t>>();
   test_converting_load<ex::fixed_size_simd<int32_t, 4>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/simd/simd.mem/store.pass.cpp b/test/std/experimental/simd/simd.mem/store.pass.cpp
index 2025a79f2..3cc3d1fa1 100644
--- a/test/std/experimental/simd/simd.mem/store.pass.cpp
+++ b/test/std/experimental/simd/simd.mem/store.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -86,10 +85,12 @@ void test_converting_store() {
   assert(buffer[3] == 8.);
 }
 
-int main() {
+int main(int, char**) {
   // TODO: adjust the tests when this assertion fails.
   test_store<ex::native_simd<int32_t>>();
   test_store<ex::fixed_size_simd<int32_t, 4>>();
   test_converting_store<ex::native_simd<int32_t>>();
   test_converting_store<ex::fixed_size_simd<int32_t, 4>>();
+
+  return 0;
 }
diff --git a/test/std/experimental/simd/simd.traits/abi_for_size.pass.cpp b/test/std/experimental/simd/simd.traits/abi_for_size.pass.cpp
index b3cd92add..2bf28dc8a 100644
--- a/test/std/experimental/simd/simd.traits/abi_for_size.pass.cpp
+++ b/test/std/experimental/simd/simd.traits/abi_for_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,4 +28,6 @@ static_assert(std::is_same<ex::abi_for_size_t<int, 4>,
                            ex::simd_abi::fixed_size<4>>::value,
               "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp b/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp
index e87eafbdb..db98dae2b 100644
--- a/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp
+++ b/test/std/experimental/simd/simd.traits/is_abi_tag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -110,4 +109,6 @@ static_assert(!ex::is_abi_tag_v<ex::simd<float>>, "");
 static_assert(!ex::is_abi_tag_v<ex::simd_mask<int>>, "");
 static_assert(!ex::is_abi_tag_v<ex::simd_mask<float>>, "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.traits/is_simd.pass.cpp b/test/std/experimental/simd/simd.traits/is_simd.pass.cpp
index 8d7c0946c..c465f0de6 100644
--- a/test/std/experimental/simd/simd.traits/is_simd.pass.cpp
+++ b/test/std/experimental/simd/simd.traits/is_simd.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -126,4 +125,6 @@ static_assert(!ex::is_simd_v<ex::simd_mask<int>>, "");
 static_assert(!ex::is_simd_v<ex::simd_mask<float>>, "");
 static_assert(!ex::is_simd_v<UserType>, "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp b/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp
index ecb68fb62..5fa208a3b 100644
--- a/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp
+++ b/test/std/experimental/simd/simd.traits/is_simd_flag_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,4 +47,6 @@ static_assert(!ex::is_simd_flag_type_v<UserType>, "");
 static_assert(!ex::is_simd_flag_type_v<ex::simd<int8_t>>, "");
 static_assert(!ex::is_simd_flag_type_v<ex::simd_mask<int8_t>>, "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp b/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp
index 736802443..348f2bfdf 100644
--- a/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp
+++ b/test/std/experimental/simd/simd.traits/is_simd_mask.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -149,4 +148,6 @@ static_assert(!ex::is_simd_mask_v<ex::simd<int>>, "");
 static_assert(!ex::is_simd_mask_v<ex::simd<float>>, "");
 static_assert(!ex::is_simd_mask_v<UserType>, "");
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/experimental/utilities/meta/meta.detect/detected_or.pass.cpp b/test/std/experimental/utilities/meta/meta.detect/detected_or.pass.cpp
index dffdb7885..3ad12b617 100644
--- a/test/std/experimental/utilities/meta/meta.detect/detected_or.pass.cpp
+++ b/test/std/experimental/utilities/meta/meta.detect/detected_or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ void test() {
     static_assert( std::is_same<Res, typename ex::detected_or_t<double, hasFoo, T>      >::value, "" );
 }
 
-int main () {
+int main(int, char**) {
     test<yesFoo, int>();
     test<noFoo, double>();
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/meta/meta.detect/detected_t.pass.cpp b/test/std/experimental/utilities/meta/meta.detect/detected_t.pass.cpp
index 333047511..ebb7ecc7d 100644
--- a/test/std/experimental/utilities/meta/meta.detect/detected_t.pass.cpp
+++ b/test/std/experimental/utilities/meta/meta.detect/detected_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,8 +40,10 @@ void test() {
     static_assert( std::is_same<Res, typename ex::detected_t<callFoo, T>>::value, "" );
 }
 
-int main () {
+int main(int, char**) {
     test<yesFoo, int>();
     test<noFoo, ex::nonesuch>();  // lookup failure returns nonesuch
     test<wrongFoo, std::string>();
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/meta/meta.detect/is_detected.pass.cpp b/test/std/experimental/utilities/meta/meta.detect/is_detected.pass.cpp
index ab4a54b7f..60b1acae8 100644
--- a/test/std/experimental/utilities/meta/meta.detect/is_detected.pass.cpp
+++ b/test/std/experimental/utilities/meta/meta.detect/is_detected.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,8 +29,10 @@ void test() {
     static_assert( b == ex::is_detected_v<copy_assign_t, T>, "" );
 }
 
-int main () {
+int main(int, char**) {
     test<int, true>();
     test<std::string, true>();
     test<not_assignable, false>();
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/meta/meta.detect/is_detected_convertible.pass.cpp b/test/std/experimental/utilities/meta/meta.detect/is_detected_convertible.pass.cpp
index c654a6a07..0944cb2d0 100644
--- a/test/std/experimental/utilities/meta/meta.detect/is_detected_convertible.pass.cpp
+++ b/test/std/experimental/utilities/meta/meta.detect/is_detected_convertible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,9 +41,11 @@ void test() {
     static_assert( b == ex::is_detected_convertible_v<int, callFoo, T>, "" );
 }
 
-int main () {
+int main(int, char**) {
     test<yesFoo, true>();
     test<noFoo, false>();
     test<wrongFoo, false>();
     test<convertibleFoo, true>();
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/meta/meta.detect/is_detected_exact.pass.cpp b/test/std/experimental/utilities/meta/meta.detect/is_detected_exact.pass.cpp
index b09763a59..c31564032 100644
--- a/test/std/experimental/utilities/meta/meta.detect/is_detected_exact.pass.cpp
+++ b/test/std/experimental/utilities/meta/meta.detect/is_detected_exact.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ void test() {
     static_assert( b == ex::is_detected_exact_v<int, callFoo, T>, "" );
 }
 
-int main () {
+int main(int, char**) {
     test<yesFoo, true>();
     test<noFoo, false>();
     test<wrongFoo, false>();
     test<convertibleFoo, false>();
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/nothing_to_do.pass.cpp b/test/std/experimental/utilities/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/experimental/utilities/nothing_to_do.pass.cpp
+++ b/test/std/experimental/utilities/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign.pass.cpp
index 33826383d..078c8c7f0 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,4 +20,6 @@ using std::experimental::propagate_const;
 
 typedef propagate_const<X> P;
 
-int main() { static_assert(!std::is_assignable<P, const P &>::value, ""); }
+int main(int, char**) { static_assert(!std::is_assignable<P, const P &>::value, ""); 
+  return 0;
+}
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_element_type.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_element_type.pass.cpp
index 6de6c63d6..512b59981 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_element_type.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_element_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<CopyConstructibleFromX> PY;
 
@@ -31,4 +30,6 @@ int main() {
   p = x1;
 
   assert(*p==1);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_propagate_const.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_propagate_const.pass.cpp
index ae6ef08d3..0da532ab4 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_propagate_const.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_convertible_propagate_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,4 +21,6 @@ using std::experimental::propagate_const;
 typedef propagate_const<X> PX;
 typedef propagate_const<CopyConstructibleFromX> PY;
 
-int main() { static_assert(!std::is_assignable<PY, const PX &>::value, ""); }
+int main(int, char**) { static_assert(!std::is_assignable<PY, const PX &>::value, ""); 
+  return 0;
+}
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_element_type.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_element_type.pass.cpp
index e4051325f..896ef9c90 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_element_type.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/assign_element_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -31,4 +30,6 @@ int main() {
   p = x1;
 
   assert(*p==1);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign.pass.cpp
index b112b078d..f1546afcc 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -29,4 +28,6 @@ int main() {
   p2=std::move(p1);
 
   assert(*p2==1);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible.pass.cpp
index 282f0aee6..dfff0bc93 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> PX;
   typedef propagate_const<MoveConstructibleFromX> PY;
@@ -30,4 +29,6 @@ int main() {
   py1=std::move(px2);
 
   assert(*py1==2);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible_propagate_const.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible_propagate_const.pass.cpp
index 743fc8eac..894910eaa 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible_propagate_const.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.assignment/move_assign_convertible_propagate_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> PX;
   typedef propagate_const<MoveConstructibleFromX> PY;
@@ -30,4 +29,6 @@ int main() {
   py1=std::move(px2);
 
   assert(*py1==2);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.explicit.ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.explicit.ctor.pass.cpp
index 10b0dd896..24e27cb6b 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.explicit.ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.explicit.ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@ using std::experimental::propagate_const;
 
 typedef propagate_const<ExplicitCopyConstructibleFromX> P;
 
-int main() {
+int main(int, char**) {
   static_assert(!std::is_convertible<P, X>::value, "");
   static_assert(std::is_constructible<P, X>::value, "");
+
+  return 0;
 }
 
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.non-explicit.ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.non-explicit.ctor.pass.cpp
index 8ba5261de..9cb325db0 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.non-explicit.ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_element_type.non-explicit.ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ void f(const P& p)
   assert(*p==2);
 }
 
-int main() {
+int main(int, char**) {
   f(X(2));
+
+  return 0;
 }
 
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.copy_ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.copy_ctor.pass.cpp
index ca65f3c47..e440245b5 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.copy_ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.copy_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,5 +21,7 @@ using std::experimental::propagate_const;
 typedef propagate_const<X> PX;
 typedef propagate_const<CopyConstructibleFromX> PY;
 
-int main() { static_assert(!std::is_constructible<PX, PY>::value, ""); }
+int main(int, char**) { static_assert(!std::is_constructible<PX, PY>::value, ""); 
+  return 0;
+}
 
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.explicit.move_ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.explicit.move_ctor.pass.cpp
index b021cbd5e..3166ebe70 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.explicit.move_ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.explicit.move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,9 @@ using std::experimental::propagate_const;
 typedef propagate_const<X> PX;
 typedef propagate_const<ExplicitMoveConstructibleFromX> PY;
 
-int main() {
+int main(int, char**) {
   static_assert(!std::is_convertible<PY, PX &&>::value, "");
   static_assert(std::is_constructible<PY, PX &&>::value, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.move_ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.move_ctor.pass.cpp
index ee104a525..ea1ac4262 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.move_ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/convertible_propagate_const.move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@ using std::experimental::propagate_const;
 typedef propagate_const<MoveConstructibleFromX> PY;
 typedef propagate_const<X> PX;
 
-int main() {
+int main(int, char**) {
   PX px(1);
   PY py(std::move(px));
 
   assert(*py==1);
+
+  return 0;
 }
 
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/copy_ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/copy_ctor.pass.cpp
index daefdf320..7c0558f39 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/copy_ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/copy_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,4 +20,6 @@ using std::experimental::propagate_const;
 
 typedef propagate_const<X> P;
 
-int main() { static_assert(!std::is_constructible<P, const P &>::value, ""); }
+int main(int, char**) { static_assert(!std::is_constructible<P, const P &>::value, ""); 
+  return 0;
+}
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.explicit.ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.explicit.ctor.pass.cpp
index 6a7289b2f..aee637620 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.explicit.ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.explicit.ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@ using std::experimental::propagate_const;
 
 typedef propagate_const<ExplicitX> P;
 
-int main() {
+int main(int, char**) {
   static_assert(!std::is_convertible<P, int>::value, "");
   static_assert(std::is_constructible<P, int>::value, "");
+
+  return 0;
 }
 
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.non-explicit.ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.non-explicit.ctor.pass.cpp
index 9c6ed89f6..93e50578a 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.non-explicit.ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/element_type.non-explicit.ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,4 +24,6 @@ void f(const P&)
 {
 }
 
-int main() { f(2); }
+int main(int, char**) { f(2); 
+  return 0;
+}
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/move_ctor.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/move_ctor.pass.cpp
index 0e46f91cf..662a605f4 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/move_ctor.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.ctors/move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
   P p1(2);
   P p2(std::move(p1));
   assert(*p2 == 2);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/dereference.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/dereference.pass.cpp
index 5e9e0434f..4e47bac37 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/dereference.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/dereference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ constexpr P f()
   return p;
 }
 
-int main() {
+int main(int, char**) {
   constexpr P p = f();
   static_assert(*p==2,"");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/explicit_operator_element_type_ptr.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/explicit_operator_element_type_ptr.pass.cpp
index 808eda0e3..6ce5d407c 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/explicit_operator_element_type_ptr.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/explicit_operator_element_type_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,4 +20,6 @@ using std::experimental::propagate_const;
 
 typedef propagate_const<X> P;
 
-int main() { static_assert(!std::is_convertible<P, int *>::value, ""); }
+int main(int, char**) { static_assert(!std::is_convertible<P, int *>::value, ""); 
+  return 0;
+}
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/get.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/get.pass.cpp
index 298389b7b..1a12c3bdd 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/get.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/get.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ constexpr P f()
   return p;
 }
 
-int main() {
+int main(int, char**) {
   constexpr P p = f();
   static_assert(*(p.get())==2,"");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/op_arrow.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/op_arrow.pass.cpp
index 810e86eea..bdc6c6937 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/op_arrow.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/op_arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ constexpr P f()
   return p;
 }
 
-int main() {
+int main(int, char**) {
   constexpr P p = f();
   static_assert(*(p.operator->())==2,"");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/operator_element_type_ptr.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/operator_element_type_ptr.pass.cpp
index 6bdf76c92..46244b391 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/operator_element_type_ptr.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.non-const_observers/operator_element_type_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<XWithImplicitIntStarConversion> P;
 
@@ -32,4 +31,6 @@ int main() {
   *ptr_1 = 2;
 
   assert(*ptr_1==2);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/dereference.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/dereference.pass.cpp
index 292335449..758bca469 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/dereference.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/dereference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
   constexpr P p(1);
 
   static_assert(*p==1,"");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/explicit_operator_element_type_ptr.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/explicit_operator_element_type_ptr.pass.cpp
index b9b6b3f90..1f98f03d2 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/explicit_operator_element_type_ptr.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/explicit_operator_element_type_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,6 +20,8 @@ using std::experimental::propagate_const;
 
 typedef propagate_const<X> P;
 
-int main() {
+int main(int, char**) {
   static_assert(!std::is_convertible<const P, const int *>::value, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/get.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/get.pass.cpp
index 8029ff474..71aea68ed 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/get.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/get.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
   constexpr P p(1);
 
   static_assert(*(p.get())==1, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/op_arrow.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/op_arrow.pass.cpp
index 4ceea8a1d..dcb1b9245 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/op_arrow.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/op_arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 using std::experimental::propagate_const;
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
   constexpr P p(1);
 
   static_assert(*(p.operator->())==1,"");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/operator_element_type_ptr.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/operator_element_type_ptr.pass.cpp
index 1ac6d254a..bfd295a1f 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/operator_element_type_ptr.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/propagate_const.observers/operator_element_type_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,4 +24,6 @@ constexpr P p(1);
 
 constexpr const int *ptr_1 = p;
 
-int main() { assert(*ptr_1 == 1); }
+int main(int, char**) { assert(*ptr_1 == 1); 
+  return 0;
+}
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.class/swap.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.class/swap.pass.cpp
index c5c832bbe..03b32dd0e 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.class/swap.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.class/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,11 +21,13 @@ using std::experimental::propagate_const;
 bool swap_called = false;
 void swap(X &, X &) { swap_called = true; }
 
-int main() {
+int main(int, char**) {
   typedef propagate_const<X> P;
   P p1(1);
   P p2(2);
   p1.swap(p2);
   assert(swap_called);
+
+  return 0;
 }
 
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp
index 488738d32..28ac9c224 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ template <> struct hash<X>
 };
 } // namespace std
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -41,4 +40,6 @@ int main() {
   auto h = std::hash<P>();
 
   assert(h(p)==99);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/equal_to.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/equal_to.pass.cpp
index d54222a97..85e400504 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/equal_to.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/equal_to.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ using std::experimental::propagate_const;
 
 constexpr bool operator==(const X &x1, const X &x2) { return x1.i_ == x2.i_; }
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -33,4 +32,6 @@ int main() {
 
   assert(c(p1_1,p2_1));
   assert(!c(p1_1,p3_2));
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater.pass.cpp
index fb8e1282f..ab7b5e9a2 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ using std::experimental::propagate_const;
 
 constexpr bool operator>(const X &x1, const X &x2) { return x1.i_ > x2.i_; }
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -35,4 +34,6 @@ int main() {
   assert(!c(p2_1,p1_1));
   assert(!c(p1_1,p3_2));
   assert(c(p3_2,p1_1));
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater_equal.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater_equal.pass.cpp
index 29a1868d6..f30e0e9d2 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater_equal.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/greater_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ using std::experimental::propagate_const;
 
 constexpr bool operator>=(const X &x1, const X &x2) { return x1.i_ >= x2.i_; }
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -35,4 +34,6 @@ int main() {
   assert(c(p2_1,p1_1));
   assert(!c(p1_1,p3_2));
   assert(c(p3_2,p1_1));
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less.pass.cpp
index 074a3914a..75afd95e1 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ using std::experimental::propagate_const;
 
 constexpr bool operator<(const X &x1, const X &x2) { return x1.i_ < x2.i_; }
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -35,4 +34,6 @@ int main() {
   assert(!c(p2_1,p1_1));
   assert(c(p1_1,p3_2));
   assert(!c(p3_2,p1_1));
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less_equal.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less_equal.pass.cpp
index a2082ec5c..4f6523a32 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less_equal.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/less_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ using std::experimental::propagate_const;
 
 constexpr bool operator<=(const X &x1, const X &x2) { return x1.i_ <= x2.i_; }
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -35,4 +34,6 @@ int main() {
   assert(c(p2_1,p1_1));
   assert(c(p1_1,p3_2));
   assert(!c(p3_2,p1_1));
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/not_equal_to.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/not_equal_to.pass.cpp
index 20756d984..1c303ae28 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/not_equal_to.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.comparison_function_objects/not_equal_to.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ using std::experimental::propagate_const;
 
 constexpr bool operator!=(const X &x1, const X &x2) { return x1.i_ != x2.i_; }
 
-int main() {
+int main(int, char**) {
 
   typedef propagate_const<X> P;
 
@@ -33,4 +32,6 @@ int main() {
 
   assert(!c(p1_1,p2_1));
   assert(c(p1_1,p3_2));
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/equal.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/equal.pass.cpp
index a4a28b48a..dafc355a4 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/equal.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ constexpr bool operator==(const nullptr_t &, const X &) {
   return false;
 }
 
-int main() {
+int main(int, char**) {
   constexpr X x1_1(1);
   constexpr X x2_1(1);
   constexpr X x3_2(2);
@@ -61,4 +60,6 @@ int main() {
 
   static_assert(!(p1_1==nullptr),"");
   static_assert(!(nullptr==p1_1),"");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_equal.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_equal.pass.cpp
index 4b5b42467..36f374730 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_equal.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_equal.pass.cpp
@@ -1,9 +1,8 @@
 //>==---------------------------------------------------------------------->==//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //>==---------------------------------------------------------------------->==//
 
@@ -25,7 +24,7 @@ constexpr bool operator>=(const X &lhs, const X &rhs) {
   return lhs.i_ >= rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   constexpr X x1_1(1);
   constexpr X x2_1(1);
   constexpr X x3_2(2);
@@ -51,4 +50,6 @@ int main() {
   static_assert(x1_1 >= p2_1, "");
   static_assert(!(x1_1 >= p3_2), "");
   static_assert(x3_2 >= p1_1, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_than.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_than.pass.cpp
index 3865b9370..6abadb39b 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_than.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/greater_than.pass.cpp
@@ -1,9 +1,8 @@
 //>=---------------------------------------------------------------------->=//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //>=---------------------------------------------------------------------->=//
 
@@ -25,7 +24,7 @@ constexpr bool operator>(const X &lhs, const X &rhs) {
   return lhs.i_ > rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   constexpr X x1_1(1);
   constexpr X x2_1(1);
   constexpr X x3_2(2);
@@ -47,4 +46,6 @@ int main() {
 
   static_assert(!(x1_1 > p2_1), "");
   static_assert(x3_2 > p1_1, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_equal.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_equal.pass.cpp
index 3ac12c27f..703faed74 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_equal.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_equal.pass.cpp
@@ -1,9 +1,8 @@
 //<==----------------------------------------------------------------------<==//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //<==----------------------------------------------------------------------<==//
 
@@ -25,7 +24,7 @@ constexpr bool operator<=(const X &lhs, const X &rhs) {
   return lhs.i_ <= rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   constexpr X x1_1(1);
   constexpr X x2_1(1);
   constexpr X x3_2(2);
@@ -52,4 +51,6 @@ int main() {
   static_assert(x1_1 <= p3_2, "");
   static_assert(!(x3_2 <= p1_1), "");
 
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_than.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_than.pass.cpp
index 42b2730c5..7481418d3 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_than.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_than.pass.cpp
@@ -1,9 +1,8 @@
 //<=----------------------------------------------------------------------<=//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //<=----------------------------------------------------------------------<=//
 
@@ -25,7 +24,7 @@ constexpr bool operator<(const X &lhs, const X &rhs) {
   return lhs.i_ < rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   constexpr X x1_1(1);
   constexpr X x2_1(1);
   constexpr X x3_2(2);
@@ -47,4 +46,6 @@ int main() {
 
   static_assert(!(p1_1 < x1_1), "");
   static_assert(p1_1 < x3_2, "");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/not_equal.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/not_equal.pass.cpp
index 1104abdec..ebfc62315 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/not_equal.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ constexpr bool operator!=(const nullptr_t &, const X &) {
   return true;
 }
 
-int main() {
+int main(int, char**) {
   constexpr X x1_1(1);
   constexpr X x2_1(1);
   constexpr X x3_2(2);
@@ -59,4 +58,6 @@ int main() {
 
   static_assert(p1_1!=nullptr,"");
   static_assert(nullptr!=p1_1,"");
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/swap.pass.cpp b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/swap.pass.cpp
index 6c3b60948..84923f78d 100644
--- a/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/swap.pass.cpp
+++ b/test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@ using std::experimental::propagate_const;
 bool swap_called = false;
 void swap(X &, X &) { swap_called = true; }
 
-int main() {
+int main(int, char**) {
   typedef propagate_const<X> P;
   P p1(1);
   P p2(2);
   swap(p1, p2);
   assert(swap_called);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/utility/utility.erased.type/erased_type.pass.cpp b/test/std/experimental/utilities/utility/utility.erased.type/erased_type.pass.cpp
index 7ac96d250..36bf4f793 100644
--- a/test/std/experimental/utilities/utility/utility.erased.type/erased_type.pass.cpp
+++ b/test/std/experimental/utilities/utility/utility.erased.type/erased_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,8 +10,10 @@
 
 #include <experimental/utility>
 
-int main()
+int main(int, char**)
 {
   std::experimental::erased_type e;
   ((void)e);
+
+  return 0;
 }
diff --git a/test/std/experimental/utilities/utility/utility.synop/includes.pass.cpp b/test/std/experimental/utilities/utility/utility.synop/includes.pass.cpp
index 2583d4345..ddf053f24 100644
--- a/test/std/experimental/utilities/utility/utility.synop/includes.pass.cpp
+++ b/test/std/experimental/utilities/utility/utility.synop/includes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,8 @@
 #   error "<experimental/utility> must include <utility>"
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/c.files/cinttypes.pass.cpp b/test/std/input.output/file.streams/c.files/cinttypes.pass.cpp
index ab2f15e95..e9e32bb67 100644
--- a/test/std/input.output/file.streams/c.files/cinttypes.pass.cpp
+++ b/test/std/input.output/file.streams/c.files/cinttypes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -878,7 +877,7 @@ template <class T> void test()
     ((void)t); // Prevent unused warning
 }
 
-int main()
+int main(int, char**)
 {
     test<std::int8_t >();
     test<std::int16_t>();
@@ -928,4 +927,6 @@ int main()
     static_assert((std::is_same<decltype(std::strtoumax("", (char**)0, 0)), std::uintmax_t>::value), "");
     static_assert((std::is_same<decltype(std::wcstoimax(L"", (wchar_t**)0, 0)), std::intmax_t>::value), "");
     static_assert((std::is_same<decltype(std::wcstoumax(L"", (wchar_t**)0, 0)), std::uintmax_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/c.files/cstdio.pass.cpp b/test/std/input.output/file.streams/c.files/cstdio.pass.cpp
index 1f1b0c3fa..af8dc97a5 100644
--- a/test/std/input.output/file.streams/c.files/cstdio.pass.cpp
+++ b/test/std/input.output/file.streams/c.files/cstdio.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -86,7 +85,7 @@
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 #endif
 
-int main()
+int main(int, char**)
 {
     std::FILE* fp = 0;
     std::fpos_t fpos = std::fpos_t();
@@ -155,4 +154,6 @@ int main()
     static_assert((std::is_same<decltype(std::puts("")), int>::value), "");
     static_assert((std::is_same<decltype(std::vprintf(" ",va)), int>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/c.files/gets.fail.cpp b/test/std/input.output/file.streams/c.files/gets.fail.cpp
index 064d72cd9..dae0e42ff 100644
--- a/test/std/input.output/file.streams/c.files/gets.fail.cpp
+++ b/test/std/input.output/file.streams/c.files/gets.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,9 @@
 
 #include <cstdio>
 
-int main()
+int main(int, char**)
 {
     (void) std::gets((char *) NULL);
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.assign/member_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.assign/member_swap.pass.cpp
index 86844343e..9bfcec0a4 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.assign/member_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -51,4 +50,6 @@ int main()
         assert(f2.sgetc() == L'2');
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.assign/move_assign.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.assign/move_assign.pass.cpp
index 66409543f..a397e6cc1 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.assign/move_assign.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -53,4 +52,6 @@ int main()
         assert(f2.sgetc() == L'2');
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.assign/nonmember_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.assign/nonmember_swap.pass.cpp
index 084d00103..f23c119af 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -53,4 +52,6 @@ int main()
         assert(f2.sgetc() == L'2');
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.cons/default.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.cons/default.pass.cpp
index f4fbbf69e..5efbb03c8 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.cons/default.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::filebuf f;
@@ -27,4 +26,6 @@ int main()
         std::wfilebuf f;
         assert(!f.is_open());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.cons/move.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.cons/move.pass.cpp
index 96806fbfe..922e514d7 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.cons/move.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -51,4 +50,6 @@ int main()
         assert(f2.sgetc() == L'2');
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
index 02e2b607e..ea244e1a3 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 namespace fs = std::filesystem;
 
-int main() {
+int main(int, char**) {
 
   fs::path p = get_temp_file_name();
   {
@@ -53,4 +52,6 @@ int main() {
     assert(f.sbumpc() == L'3');
   }
   remove(p.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.members/open_pointer.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.members/open_pointer.pass.cpp
index 9d2d56782..bd662a9f7 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.members/open_pointer.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.members/open_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -48,4 +47,6 @@ int main()
         assert(f.sbumpc() == L'3');
     }
     remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp
index 042fe03d4..6636a4223 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct test_buf
     virtual int_type overflow(int_type c = traits_type::eof()) {return base::overflow(c);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test_buf<char> f;
@@ -141,4 +140,6 @@ int main()
         assert(f.sbumpc() == -1);
     }
     std::remove("overflow.dat");
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/pbackfail.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/pbackfail.pass.cpp
index 3ac505e52..728eec293 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/pbackfail.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/pbackfail.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct test_buf
     virtual int_type pbackfail(int_type c = traits_type::eof()) {return base::pbackfail(c);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test_buf<char> f;
@@ -61,4 +60,6 @@ int main()
             assert(f.sgetc() == '2');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/seekoff.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/seekoff.pass.cpp
index d2780c627..6f50357a0 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/seekoff.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/seekoff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         char buf[10];
@@ -63,4 +62,6 @@ int main()
         assert(f.sgetc() == L'l');
     }
     std::remove("seekoff.dat");
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp
index 3c9c0d35d..47760a916 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct test_buf
     virtual int_type underflow() {return base::underflow();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test_buf<char> f;
@@ -122,4 +121,6 @@ int main()
         assert(f.sbumpc() == 0x4E53);
         assert(f.sbumpc() == static_cast<Traits::int_type>(-1));
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp
index 5d77e0054..40c010f6f 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <fstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_streambuf<char>, std::basic_filebuf<char> >::value), "");
     static_assert((std::is_same<std::basic_filebuf<char>::char_type, char>::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::basic_filebuf<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_filebuf<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_filebuf<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.assign/member_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.assign/member_swap.pass.cpp
index 949ea50d0..7c94de924 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ std::pair<std::string, std::string> get_temp_file_names() {
   return names;
 }
 
-int main()
+int main(int, char**)
 {
     std::pair<std::string, std::string> temp_files = get_temp_file_names();
     std::string& temp1 = temp_files.first;
@@ -88,4 +87,6 @@ int main()
     }
     std::remove(temp1.c_str());
     std::remove(temp2.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.assign/move_assign.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.assign/move_assign.pass.cpp
index b143bd4a5..d2cc6ce72 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.assign/move_assign.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -47,4 +46,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.assign/nonmember_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.assign/nonmember_swap.pass.cpp
index 4ff84f26c..071ca5d85 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ std::pair<std::string, std::string> get_temp_file_names() {
   return names;
 }
 
-int main()
+int main(int, char**)
 {
     std::pair<std::string, std::string> temp_files = get_temp_file_names();
     std::string& temp1 = temp_files.first;
@@ -90,4 +89,6 @@ int main()
     }
     std::remove(temp1.c_str());
     std::remove(temp2.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.cons/default.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.cons/default.pass.cpp
index cfd5a031f..b38bbb443 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.cons/default.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         std::fstream fs;
@@ -25,4 +24,6 @@ int main()
     {
         std::wfstream fs;
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.cons/move.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.cons/move.pass.cpp
index 556cc858a..fb639f1c5 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.cons/move.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -45,4 +44,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
index d9b4a8ccb..d86b4b6cc 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 namespace fs = std::filesystem;
 
-int main() {
+int main(int, char**) {
   fs::path p = get_temp_file_name();
   {
     std::fstream fs(p, std::ios_base::in | std::ios_base::out |
@@ -46,4 +45,6 @@ int main() {
     assert(x == 3.25);
   }
   std::remove(p.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.cons/pointer.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.cons/pointer.pass.cpp
index 06a6b7794..4cade955b 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.cons/pointer.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.cons/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -41,4 +40,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.cons/string.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.cons/string.pass.cpp
index 4b0819f8a..15a2c7023 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.cons/string.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -43,4 +42,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.members/close.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.members/close.pass.cpp
index 0e4bc7177..94a06c467 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.members/close.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.members/close.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -39,4 +38,6 @@ int main()
         assert(!fs.is_open());
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
index 69cbf3f5c..799829e2b 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main() {
+int main(int, char**) {
   std::filesystem::path p = get_temp_file_name();
   {
     std::fstream stream;
@@ -49,4 +48,6 @@ int main() {
     assert(x == 3.25);
   }
   std::remove(p.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.members/open_pointer.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.members/open_pointer.pass.cpp
index 231bb82c7..32f1d0096 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.members/open_pointer.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.members/open_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -47,4 +46,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.members/open_string.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.members/open_string.pass.cpp
index 182f12c47..90cd56117 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.members/open_string.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.members/open_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -47,4 +46,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream.members/rdbuf.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream.members/rdbuf.pass.cpp
index d83983269..0f39fc63b 100644
--- a/test/std/input.output/file.streams/fstreams/fstream.members/rdbuf.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream.members/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::fstream fs;
@@ -27,4 +26,6 @@ int main()
         std::wfstream fs;
         assert(fs.rdbuf());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp b/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp
index 6ced241f7..783cfa3a7 100644
--- a/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <fstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_iostream<char>, std::basic_fstream<char> >::value), "");
     static_assert((std::is_same<std::basic_fstream<char>::char_type, char>::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::basic_fstream<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_fstream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_fstream<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.assign/member_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.assign/member_swap.pass.cpp
index 18443cedb..17b88140d 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs1("test.dat");
@@ -39,4 +38,6 @@ int main()
         fs2 >> x;
         assert(x == 3.25);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.assign/move_assign.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.assign/move_assign.pass.cpp
index 36fa29a4e..d5fe0984e 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.assign/move_assign.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fso("test.dat");
@@ -37,4 +36,6 @@ int main()
         fs >> x;
         assert(x == 3.25);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.assign/nonmember_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.assign/nonmember_swap.pass.cpp
index 5700720a0..c4cd592d1 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs1("test.dat");
@@ -40,4 +39,6 @@ int main()
         fs2 >> x;
         assert(x == 3.25);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.cons/default.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.cons/default.pass.cpp
index 41e6780e8..7e76d6f8a 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.cons/default.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs;
@@ -25,4 +24,6 @@ int main()
     {
         std::wifstream fs;
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.cons/move.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.cons/move.pass.cpp
index eeb06e0e5..d8a58ac53 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.cons/move.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fso("test.dat");
@@ -35,4 +34,6 @@ int main()
         fs >> x;
         assert(x == 3.25);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
index 99eae3a28..8a3a361bb 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.cons/path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 namespace fs = std::filesystem;
 
-int main() {
+int main(int, char**) {
   {
     fs::path p;
     static_assert(!std::is_convertible<fs::path, std::ifstream>::value,
@@ -50,4 +49,6 @@ int main() {
   // std::wifstream(const fs::path&, std::ios_base::openmode) is tested in
   // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
   // which creates writable files.
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.cons/pointer.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.cons/pointer.pass.cpp
index ef3959cfc..d44b3be75 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.cons/pointer.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.cons/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs("test.dat");
@@ -37,4 +36,6 @@ int main()
     // std::wifstream(const char*, std::ios_base::openmode) is tested in
     // test/std/input.output/file.streams/fstreams/ofstream.cons/pointer.pass.cpp
     // which creates writable files.
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.cons/string.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.cons/string.pass.cpp
index d4155ea8e..c4e979e30 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.cons/string.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs(std::string("test.dat"));
@@ -37,4 +36,6 @@ int main()
     // std::wifstream(const std::string&, std::ios_base::openmode) is tested in
     // test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
     // which creates writable files.
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.members/close.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.members/close.pass.cpp
index 3e3933240..e72bd5487 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.members/close.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.members/close.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs;
@@ -35,4 +34,6 @@ int main()
         fs.close();
         assert(!fs.is_open());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
index 82f7c64eb..bce5fb97d 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.members/open_path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <filesystem>
 #include <cassert>
 
-int main() {
+int main(int, char**) {
   {
     std::ifstream fs;
     assert(!fs.is_open());
@@ -45,4 +44,6 @@ int main() {
     fs >> c;
     assert(c == L'r');
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.members/open_pointer.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.members/open_pointer.pass.cpp
index 47dc85fac..50ec53fdc 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.members/open_pointer.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.members/open_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs;
@@ -43,4 +42,6 @@ int main()
         fs >> c;
         assert(c == L'r');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.members/open_string.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.members/open_string.pass.cpp
index 619694e27..155ae0e63 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.members/open_string.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.members/open_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs;
@@ -43,4 +42,6 @@ int main()
         fs >> c;
         assert(c == L'r');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream.members/rdbuf.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream.members/rdbuf.pass.cpp
index 53fd294e7..455d2274e 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream.members/rdbuf.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream.members/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream fs("test.dat");
@@ -29,4 +28,6 @@ int main()
         std::wfilebuf* fb = fs.rdbuf();
         assert(fb->sgetc() == L'r');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ifstream/types.pass.cpp b/test/std/input.output/file.streams/fstreams/ifstream/types.pass.cpp
index dd39eee1a..620c39608 100644
--- a/test/std/input.output/file.streams/fstreams/ifstream/types.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ifstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <fstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_istream<char>, std::basic_ifstream<char> >::value), "");
     static_assert((std::is_same<std::basic_ifstream<char>::char_type, char>::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::basic_ifstream<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_ifstream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_ifstream<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.assign/member_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.assign/member_swap.pass.cpp
index 95224774c..fcfb94ecf 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ std::pair<std::string, std::string> get_temp_file_names() {
   return names;
 }
 
-int main()
+int main(int, char**)
 {
     std::pair<std::string, std::string> temp_files = get_temp_file_names();
     std::string& temp1 = temp_files.first;
@@ -96,4 +95,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp2.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.assign/move_assign.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.assign/move_assign.pass.cpp
index 094f55073..fbc3bf597 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.assign/move_assign.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -49,4 +48,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.assign/nonmember_swap.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.assign/nonmember_swap.pass.cpp
index 31f2153eb..3cbf508d9 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ std::pair<std::string, std::string> get_temp_file_names() {
   return names;
 }
 
-int main()
+int main(int, char**)
 {
     std::pair<std::string, std::string> temp_files = get_temp_file_names();
     std::string& temp1 = temp_files.first;
@@ -97,4 +96,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp2.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.cons/default.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.cons/default.pass.cpp
index f8308ab06..baa4bfe9d 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.cons/default.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <fstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         std::ofstream fs;
@@ -25,4 +24,6 @@ int main()
     {
         std::wofstream fs;
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.cons/move.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.cons/move.pass.cpp
index fe885cf40..3a3e11e91 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.cons/move.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -47,4 +46,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
index 9a23384b0..254d696aa 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 namespace fs = std::filesystem;
 
-int main() {
+int main(int, char**) {
   fs::path p = get_temp_file_name();
   {
     static_assert(!std::is_convertible<fs::path, std::ofstream>::value,
@@ -66,4 +65,6 @@ int main() {
     assert(x == 3.25);
   }
   std::remove(p.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.cons/pointer.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.cons/pointer.pass.cpp
index 60f925690..ce23d5e36 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.cons/pointer.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.cons/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -55,4 +54,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
index b95db6626..c19c278f4 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -55,4 +54,6 @@ int main()
         assert(x == 3.25);
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.members/close.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.members/close.pass.cpp
index b8c358d8e..3ea39985e 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.members/close.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.members/close.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -39,4 +38,6 @@ int main()
         assert(!fs.is_open());
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
index 867998bb7..1b783f6d5 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 namespace fs = std::filesystem;
 
-int main() {
+int main(int, char**) {
   fs::path p = get_temp_file_name();
   {
     std::ofstream fs;
@@ -59,4 +58,6 @@ int main() {
     assert(c == L'a');
   }
   std::remove(p.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.members/open_pointer.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.members/open_pointer.pass.cpp
index e5cddc9e1..5bf58814d 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.members/open_pointer.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.members/open_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -55,4 +54,6 @@ int main()
         assert(c == L'a');
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.members/open_string.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.members/open_string.pass.cpp
index d54aa1824..52db618e1 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.members/open_string.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.members/open_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -55,4 +54,6 @@ int main()
         assert(c == L'a');
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream.members/rdbuf.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream.members/rdbuf.pass.cpp
index d707e0a32..a7b51fb35 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream.members/rdbuf.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream.members/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     std::string temp = get_temp_file_name();
     {
@@ -33,4 +32,6 @@ int main()
         assert(fb->sputc(L'r') == L'r');
     }
     std::remove(temp.c_str());
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/fstreams/ofstream/types.pass.cpp b/test/std/input.output/file.streams/fstreams/ofstream/types.pass.cpp
index 243994add..231807195 100644
--- a/test/std/input.output/file.streams/fstreams/ofstream/types.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/ofstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <fstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_ostream<char>, std::basic_ofstream<char> >::value), "");
     static_assert((std::is_same<std::basic_ofstream<char>::char_type, char>::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::basic_ofstream<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_ofstream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_ofstream<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/file.streams/nothing_to_do.pass.cpp b/test/std/input.output/file.streams/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/file.streams/nothing_to_do.pass.cpp
+++ b/test/std/input.output/file.streams/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp
index a81d5ea79..717c766b9 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp
index 204207276..4040933e9 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default.pass.cpp
index 1d83cc69d..1cb88a351 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   // Default
   {
@@ -28,4 +27,6 @@ int main() {
     directory_entry e;
     assert(e.path() == path());
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default_const.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default_const.pass.cpp
index 240541d20..0f681531a 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default_const.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/default_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   // Default
   {
@@ -29,4 +28,6 @@ int main() {
     const directory_entry e;
     assert(e.path() == path());
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp
index 238a8549e..f4c7e44e9 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp
index f104980c9..38107da07 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp
index b06bd1293..aac7f76cb 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.cons/path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp
index d19c8c2ad..b2240ed76 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp
index 575f0d59b..859763b91 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/refresh.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp
index 4a9b76d63..e8ecdee32 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.mods/replace_filename.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/comparisons.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/comparisons.pass.cpp
index 7df36fed3..12158349e 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/comparisons.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,9 @@ void test_comparisons_simple() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_comparison_signatures();
   test_comparisons_simple();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp
index 04dec92c9..f61222bbb 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp
index 2a0d80ca6..036c87939 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/file_type_obs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp
index 17124c132..e89ccf9ec 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/hard_link_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp
index afdd47a51..8427fd181 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/last_write_time.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/path.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/path.pass.cpp
index 2abb13df1..28bd2752e 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/path.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -82,7 +81,9 @@ void test_path_conversion() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_path_method();
   test_path_conversion();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp
index ec654468b..2a59cdb18 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/status.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp
index e8850c3a7..55821af5e 100644
--- a/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_entry/directory_entry.obs/symlink_status.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp
index ac224ac7a..99da0c9ff 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp
index 3f08e4024..6dd81f291 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp
index 0a33544c5..8cbea9dfc 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/default_ctor.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/default_ctor.pass.cpp
index 21c4ed3b7..9f60ec286 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/default_ctor.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/default_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 
 
-int main() {
+int main(int, char**) {
     {
         static_assert(std::is_nothrow_default_constructible<fs::directory_iterator>::value, "");
     }
@@ -32,4 +31,6 @@ int main() {
         const fs::directory_iterator d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp
index a641e9237..71f7b2ada 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp
index a2bf2ac9f..7870d73b7 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp
index 1c7224344..2e41740ae 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.members/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp
index 1aa177505..2fd6abe29 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/directory_iterator.nonmembers/begin_end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.directory_iterator/types.pass.cpp b/test/std/input.output/filesystems/class.directory_iterator/types.pass.cpp
index 4619083e8..3932be021 100644
--- a/test/std/input.output/filesystems/class.directory_iterator/types.pass.cpp
+++ b/test/std/input.output/filesystems/class.directory_iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 
 
-int main() {
+int main(int, char**) {
     using namespace fs;
     using D = directory_iterator;
     ASSERT_SAME_TYPE(D::value_type, directory_entry);
@@ -34,4 +33,6 @@ int main() {
     ASSERT_SAME_TYPE(D::pointer, const directory_entry*);
     ASSERT_SAME_TYPE(D::reference, const directory_entry&);
     ASSERT_SAME_TYPE(D::iterator_category, std::input_iterator_tag);
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.file_status/file_status.cons.pass.cpp b/test/std/input.output/filesystems/class.file_status/file_status.cons.pass.cpp
index 6676c7b7d..74fdaaf20 100644
--- a/test/std/input.output/filesystems/class.file_status/file_status.cons.pass.cpp
+++ b/test/std/input.output/filesystems/class.file_status/file_status.cons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "test_convertible.hpp"
 
 
-int main() {
+int main(int, char**) {
  using namespace fs;
   // Default ctor
   {
@@ -57,4 +56,6 @@ int main() {
     assert(f.type()  == file_type::regular);
     assert(f.permissions() == perms::owner_read);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.file_status/file_status.mods.pass.cpp b/test/std/input.output/filesystems/class.file_status/file_status.mods.pass.cpp
index 4cbf2062a..0ee9f709b 100644
--- a/test/std/input.output/filesystems/class.file_status/file_status.mods.pass.cpp
+++ b/test/std/input.output/filesystems/class.file_status/file_status.mods.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
 
   file_status st;
@@ -46,4 +45,6 @@ int main() {
     st.permissions(perms::owner_read);
     assert(st.permissions() == perms::owner_read);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.file_status/file_status.obs.pass.cpp b/test/std/input.output/filesystems/class.file_status/file_status.obs.pass.cpp
index 89739b77d..ec4863139 100644
--- a/test/std/input.output/filesystems/class.file_status/file_status.obs.pass.cpp
+++ b/test/std/input.output/filesystems/class.file_status/file_status.obs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
 
   const file_status st(file_type::regular, perms::owner_read);
@@ -42,4 +41,6 @@ int main() {
                  "operation must return perms");
     assert(st.permissions() == perms::owner_read);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.filesystem_error/filesystem_error.members.pass.cpp b/test/std/input.output/filesystems/class.filesystem_error/filesystem_error.members.pass.cpp
index b7484df5c..d9d1a0333 100644
--- a/test/std/input.output/filesystems/class.filesystem_error/filesystem_error.members.pass.cpp
+++ b/test/std/input.output/filesystems/class.filesystem_error/filesystem_error.members.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -95,8 +94,10 @@ void test_signatures()
   }
 }
 
-int main() {
+int main(int, char**) {
   static_assert(std::is_base_of<std::system_error, fs::filesystem_error>::value, "");
   test_constructors();
   test_signatures();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.itr/iterator.pass.cpp b/test/std/input.output/filesystems/class.path/path.itr/iterator.pass.cpp
index b7a0383e0..558206d70 100644
--- a/test/std/input.output/filesystems/class.path/path.itr/iterator.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.itr/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -98,8 +97,10 @@ void checkBeginEndBasic() {
 
 }
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   checkIteratorConcepts();
   checkBeginEndBasic(); // See path.decompose.pass.cpp for more tests.
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
index a02ef18c4..2f468e595 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -312,7 +311,7 @@ void test_sfinae()
   }
 }
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   for (auto const & TC : Cases) {
@@ -336,4 +335,6 @@ int main()
     doAppendSourceAllocTest<wchar_t>(TC);
   }
   test_sfinae();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.assign/braced_init.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.assign/braced_init.pass.cpp
index fe677c3e6..aff89f27b 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.assign/braced_init.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.assign/braced_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,9 +22,11 @@
 #include "count_new.hpp"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   path p("abc");
   p = {};
   assert(p.native() == "");
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.assign/copy.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.assign/copy.pass.cpp
index a0575e649..9265c70f6 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.assign/copy.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.assign/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   static_assert(std::is_copy_assignable<path>::value, "");
   static_assert(!std::is_nothrow_copy_assignable<path>::value, "should not be noexcept");
@@ -33,4 +32,6 @@ int main() {
   assert(p.native() == s);
   assert(p2.native() == s);
   assert(&pref == &p2);
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.assign/move.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.assign/move.pass.cpp
index 71fa47d1b..5e5fb1e0e 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.assign/move.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "count_new.hpp"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   static_assert(std::is_nothrow_move_assignable<path>::value, "");
   assert(globalMemCounter.checkOutstandingNewEq(0));
@@ -39,4 +38,6 @@ int main() {
     assert(p.native() != s); // Testing moved from state
     assert(&pref == &p2);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
index 92eff6e07..9c23e3b3e 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -229,7 +228,7 @@ void RunStringMoveTest(const char* Expect) {
   }
 }
 
-int main() {
+int main(int, char**) {
   for (auto const& MS : PathList) {
     RunTestCase<char>(MS);
     RunTestCase<wchar_t>(MS);
@@ -238,4 +237,6 @@ int main() {
     RunStringMoveTest(MS);
   }
   test_sfinae();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
index 7791097dc..165e62fe4 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,6 +64,8 @@ const PathCompareTest CompareTestCases[] =
     {"//foo//bar///baz////", "//foo/bar/baz/", 0}, // duplicate separators
     {"///foo/bar", "/foo/bar", 0}, // "///" is not a root directory
     {"/foo/bar/", "/foo/bar", 1}, // trailing separator
+    {"foo", "/foo", -1}, // if !this->has_root_directory() and p.has_root_directory(), a value less than 0.
+    {"/foo", "foo", 1}, //  if this->has_root_directory() and !p.has_root_directory(), a value greater than 0.
     {"//" LONGA "////" LONGB "/" LONGC "///" LONGD, "//" LONGA "/" LONGB "/" LONGC "/" LONGD, 0},
     { LONGA "/" LONGB "/" LONGC, LONGA "/" LONGB "/" LONGB, 1}
 
@@ -79,7 +80,7 @@ static inline int normalize_ret(int ret)
   return ret < 0 ? -1 : (ret > 0 ? 1 : 0);
 }
 
-int main()
+void test_compare_basic()
 {
   using namespace fs;
   for (auto const & TC : CompareTestCases) {
@@ -136,3 +137,56 @@ int main()
     }
   }
 }
+
+int CompareElements(std::vector<std::string> const& LHS, std::vector<std::string> const& RHS) {
+  bool IsLess = std::lexicographical_compare(LHS.begin(), LHS.end(), RHS.begin(), RHS.end());
+  if (IsLess)
+    return -1;
+
+  bool IsGreater = std::lexicographical_compare(RHS.begin(), RHS.end(), LHS.begin(), LHS.end());
+  if (IsGreater)
+    return 1;
+
+  return 0;
+}
+
+void test_compare_elements() {
+  struct {
+    std::vector<std::string> LHSElements;
+    std::vector<std::string> RHSElements;
+    int Expect;
+  } TestCases[] = {
+      {{"a"}, {"a"}, 0},
+      {{"a"}, {"b"}, -1},
+      {{"b"}, {"a"}, 1},
+      {{"a", "b", "c"}, {"a", "b", "c"}, 0},
+      {{"a", "b", "c"}, {"a", "b", "d"}, -1},
+      {{"a", "b", "d"}, {"a", "b", "c"}, 1},
+      {{"a", "b"}, {"a", "b", "c"}, -1},
+      {{"a", "b", "c"}, {"a", "b"}, 1},
+
+  };
+
+  auto BuildPath = [](std::vector<std::string> const& Elems) {
+    fs::path p;
+    for (auto &E : Elems)
+      p /= E;
+    return p;
+  };
+
+  for (auto &TC : TestCases) {
+    fs::path LHS = BuildPath(TC.LHSElements);
+    fs::path RHS = BuildPath(TC.RHSElements);
+    const int ExpectCmp = CompareElements(TC.LHSElements, TC.RHSElements);
+    assert(ExpectCmp == TC.Expect);
+    const int GotCmp = normalize_ret(LHS.compare(RHS));
+    assert(GotCmp == TC.Expect);
+  }
+}
+
+int main(int, char**) {
+  test_compare_basic();
+  test_compare_elements();
+
+  return 0;
+}
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.concat.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.concat.pass.cpp
index 03d5134fe..b074e831e 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.concat.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.concat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -326,7 +325,7 @@ void test_sfinae() {
   }
 }
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   for (auto const & TC : Cases) {
@@ -385,4 +384,6 @@ int main()
     doConcatECharTest<char32_t>(TC);
   }
   test_sfinae();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.construct/copy.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.construct/copy.pass.cpp
index 69bdb7415..1490c0b9f 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.construct/copy.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.construct/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   static_assert(std::is_copy_constructible<path>::value, "");
   static_assert(!std::is_nothrow_copy_constructible<path>::value, "should not be noexcept");
@@ -31,4 +30,6 @@ int main() {
   path p2(p);
   assert(p.native() == s);
   assert(p2.native() == s);
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.construct/default.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.construct/default.pass.cpp
index aa4b03e9b..b31728da1 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.construct/default.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.construct/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,9 +21,11 @@
 #include "test_macros.h"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   static_assert(std::is_nothrow_default_constructible<path>::value, "");
   const path p;
   assert(p.empty());
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.construct/move.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.construct/move.pass.cpp
index 2e8cce228..494a77c3c 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.construct/move.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.construct/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "count_new.hpp"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   static_assert(std::is_nothrow_move_constructible<path>::value, "");
   assert(globalMemCounter.checkOutstandingNewEq(0));
@@ -37,4 +36,6 @@ int main() {
     assert(p2.native() == s);
     assert(p.native() != s); // Testing moved from state
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.construct/source.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.construct/source.pass.cpp
index 39d63f456..bcb9986ce 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.construct/source.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.construct/source.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -118,7 +117,7 @@ void test_sfinae() {
   }
 }
 
-int main() {
+int main(int, char**) {
   for (auto const& MS : PathList) {
     RunTestCase<char>(MS);
     RunTestCase<wchar_t>(MS);
@@ -126,4 +125,6 @@ int main() {
     RunTestCase<char32_t>(MS);
   }
   test_sfinae();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.fail.cpp b/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.fail.cpp
index 1a722d7a2..5248f6751 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.fail.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.decompose/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     fs::path c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.decompose/path.decompose.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.decompose/path.decompose.pass.cpp
index 4eb15cd0b..be9cefb76 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.decompose/path.decompose.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.decompose/path.decompose.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -209,8 +208,10 @@ void decompFilenameTest()
   }
 }
 
-int main()
+int main(int, char**)
 {
   decompPathTest();
   decompFilenameTest();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_normal.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_normal.pass.cpp
index 3e2fdd08d..f1e616542 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_normal.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_normal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main() {
+int main(int, char**) {
   // clang-format off
   struct {
     std::string input;
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_relative_and_proximate.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_relative_and_proximate.pass.cpp
index 52c577bc8..7e31956ee 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_relative_and_proximate.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.gen/lexically_relative_and_proximate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main() {
+int main(int, char**) {
   // clang-format off
   struct {
     std::string input;
@@ -40,8 +39,8 @@ int main() {
       {"a", "/", ""},
       {"//net", "a", ""},
       {"a", "//net", ""},
-      {"//net/", "//net", ""},
-      {"//net", "//net/", ".."},
+      {"//net/", "//net", "."},
+      {"//net", "//net/", "."},
       {"//base", "a", ""},
       {"a", "a", "."},
       {"a/b", "a/b", "."},
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/generic_string_alloc.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/generic_string_alloc.pass.cpp
index 93c49a6ab..707a7010f 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/generic_string_alloc.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/generic_string_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ MultiStringType longString = MKSTR("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQR
 // generic_string<C, T, A> forwards to string<C, T, A>. Tests for
 // string<C, T, A>() are in "path.native.op/string_alloc.pass.cpp".
 // generic_string is minimally tested here.
-int main()
+int main(int, char**)
 {
   using namespace fs;
   using CharT = wchar_t;
@@ -52,4 +51,6 @@ int main()
     assert(Alloc::alloc_count > 0);
     assert(Alloc::outstanding_alloc() == 1);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/named_overloads.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/named_overloads.pass.cpp
index d41ab619a..04ae673ac 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/named_overloads.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.generic.obs/named_overloads.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 
 MultiStringType longString = MKSTR("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/123456789/abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   auto const& MS = longString;
@@ -58,4 +57,6 @@ int main()
     std::u32string s = p.generic_u32string();
     assert(s == (const char32_t*)MS);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/clear.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/clear.pass.cpp
index fca642647..01538539f 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/clear.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   {
     path p;
@@ -41,4 +40,6 @@ int main() {
     p2.clear();
     assert(p2.empty());
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/make_preferred.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/make_preferred.pass.cpp
index ec914b1bc..4530ef875 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/make_preferred.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/make_preferred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ const MakePreferredTestcase TestCases[] =
     , {"\\foo\\/bar\\/baz\\"}
   };
 
-int main()
+int main(int, char**)
 {
   // This operation is an identity operation on linux.
   using namespace fs;
@@ -51,4 +50,6 @@ int main()
     assert(p.native() == TC.value);
     assert(&Ref == &p);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/remove_filename.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/remove_filename.pass.cpp
index b4019e7f2..7cb562c22 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/remove_filename.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/remove_filename.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ const RemoveFilenameTestcase TestCases[] =
     , {"bar/../baz/./file.txt", "bar/../baz/./"}
   };
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   for (auto const & TC : TestCases) {
@@ -70,4 +69,6 @@ int main()
     assert(&Ref == &p);
     assert(!p.has_filename());
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_extension.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_extension.pass.cpp
index c118b8714..6fec420ba 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_extension.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_extension.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ const ReplaceExtensionTestcase NoArgCases[] =
     , {"foo..cpp", "foo.", ""}
 };
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   for (auto const & TC : TestCases) {
@@ -69,4 +68,6 @@ int main()
     assert(p == TC.expect);
     assert(&Ref == &p);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_filename.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_filename.pass.cpp
index 07cd32772..8142e7907 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_filename.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/replace_filename.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ const ReplaceFilenameTestcase TestCases[] =
     , {"/foo\\baz/bong", "/foo\\baz/bar", "bar"}
   };
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   for (auto const & TC : TestCases) {
@@ -68,4 +67,6 @@ int main()
       ASSERT_EQ(p, p2);
     }
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/swap.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/swap.pass.cpp
index eecfe4252..2e9dac5e4 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.modifiers/swap.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.modifiers/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ const SwapTestcase TestCases[] =
 #undef LONG_STR1
 #undef LONG_STR2
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   {
@@ -77,4 +76,6 @@ int main()
     }
     assert(p1 == Val);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp
index e035764d2..8b35ee8c8 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/c_str.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   const char* const value = "hello world";
@@ -39,4 +38,6 @@ int main()
     assert(p.c_str() == str_value);
     assert(p.native().c_str() == p.c_str());
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/named_overloads.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/named_overloads.pass.cpp
index bb0f58cab..c06de9795 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/named_overloads.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/named_overloads.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 
 MultiStringType longString = MKSTR("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/123456789/abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   auto const& MS = longString;
@@ -59,4 +58,6 @@ int main()
     std::u32string s = p.u32string();
     assert(s == (const char32_t*)MS);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/native.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/native.pass.cpp
index ca02b8680..3b88b5d6c 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/native.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/native.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   const char* const value = "hello world";
@@ -36,4 +35,6 @@ int main()
     path p(value);
     assert(p.native() == value);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/operator_string.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/operator_string.pass.cpp
index 4f5f77df4..9f0069051 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/operator_string.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/operator_string.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   using string_type = path::string_type;
@@ -43,4 +42,6 @@ int main()
     assert(s == value);
     assert(p == value);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/string_alloc.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/string_alloc.pass.cpp
index 744ad4df8..4ace380b8 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.native.obs/string_alloc.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.native.obs/string_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -117,7 +116,7 @@ void doLongStringTest(MultiStringType const& MS) {
   /////////////////////////////////////////////////////////////////////////////
 }
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   {
@@ -134,4 +133,6 @@ int main()
     doLongStringTest<char16_t>(S);
     doLongStringTest<char32_t>(S);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.member/path.query/tested_in_path_decompose.pass.cpp b/test/std/input.output/filesystems/class.path/path.member/path.query/tested_in_path_decompose.pass.cpp
index be662fcb1..32c37e7f7 100644
--- a/test/std/input.output/filesystems/class.path/path.member/path.query/tested_in_path_decompose.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.member/path.query/tested_in_path_decompose.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,4 +28,6 @@
 // bool is_relative() const;
 
 // tested in path.decompose
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/append_op.fail.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/append_op.fail.cpp
new file mode 100644
index 000000000..bcc4758f4
--- /dev/null
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/append_op.fail.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03
+
+// <filesystem>
+
+#include "filesystem_include.hpp"
+
+using namespace fs;
+
+struct ConvToPath {
+  operator fs::path() const {
+    return "";
+  }
+};
+
+int main(int, char**) {
+  ConvToPath LHS, RHS;
+  (void)(LHS / RHS); // expected-error {{invalid operands to binary expression}}
+
+  return 0;
+}
\ No newline at end of file
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/append_op.pass.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/append_op.pass.cpp
index 09498bf21..67af37686 100644
--- a/test/std/input.output/filesystems/class.path/path.nonmember/append_op.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/append_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,13 +19,17 @@
 #include "test_macros.h"
 #include "filesystem_test_helper.hpp"
 
-
 // This is mainly tested via the member append functions.
-int main()
+int main(int, char**)
 {
   using namespace fs;
   path p1("abc");
   path p2("def");
   path p3 = p1 / p2;
   assert(p3 == "abc/def");
+
+  path p4 = p1 / "def";
+  assert(p4 == "abc/def");
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/comparison_ops.fail.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/comparison_ops.fail.cpp
new file mode 100644
index 000000000..8f1732186
--- /dev/null
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/comparison_ops.fail.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03
+
+// <filesystem>
+
+
+#include "filesystem_include.hpp"
+
+using namespace fs;
+
+struct ConvToPath {
+  operator fs::path() const {
+    return "";
+  }
+};
+
+int main(int, char**) {
+  ConvToPath LHS, RHS;
+  (void)(LHS == RHS); // expected-error {{invalid operands to binary expression}}
+  (void)(LHS != RHS); // expected-error {{invalid operands to binary expression}}
+  (void)(LHS < RHS); // expected-error {{invalid operands to binary expression}}
+  (void)(LHS <= RHS); // expected-error {{invalid operands to binary expression}}
+  (void)(LHS > RHS); // expected-error {{invalid operands to binary expression}}
+  (void)(LHS >= RHS); // expected-error {{invalid operands to binary expression}}
+
+  return 0;
+}
\ No newline at end of file
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/comparison_ops_tested_elsewhere.pass.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/comparison_ops_tested_elsewhere.pass.cpp
index 28867432c..c61a5a025 100644
--- a/test/std/input.output/filesystems/class.path/path.nonmember/comparison_ops_tested_elsewhere.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/comparison_ops_tested_elsewhere.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,4 +10,6 @@
 
 // The comparison operators are tested as part of [path.compare]
 // in class.path/path.members/path.compare.pass.cpp
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
index b03b8008b..49d28daf9 100644
--- a/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,4 +10,6 @@
 
 // The "hash_value" function is tested as part of [path.compare]
 // in class.path/path.members/path.compare.pass.cpp
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/path.factory.pass.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/path.factory.pass.cpp
index 96b8286d5..557849ca8 100644
--- a/test/std/input.output/filesystems/class.path/path.nonmember/path.factory.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/path.factory.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main()
+int main(int, char**)
 {
   using namespace fs;
   const char* In1 = "abcd/efg";
@@ -49,4 +48,6 @@ int main()
     path p = fs::u8path(In3, In3End);
     assert(p == In1);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/path.io.pass.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/path.io.pass.cpp
index 7902289ed..31eea925a 100644
--- a/test/std/input.output/filesystems/class.path/path.nonmember/path.io.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/path.io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -89,10 +88,12 @@ void test_LWG2989() {
   static_assert(!is_istreamable<decltype(std::wcin), std::string>::value, "");
 }
 
-int main() {
+int main(int, char**) {
   doIOTest<char>();
   doIOTest<wchar_t>();
   //doIOTest<char16_t>();
   //doIOTest<char32_t>();
   test_LWG2989();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/path.io.unicode_bug.pass.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/path.io.unicode_bug.pass.cpp
index 65be19fdc..c5bb6bf12 100644
--- a/test/std/input.output/filesystems/class.path/path.nonmember/path.io.unicode_bug.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/path.io.unicode_bug.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,9 @@ void doIOTest() {
 }
 
 
-int main() {
+int main(int, char**) {
   doIOTest<char16_t>();
   doIOTest<char32_t>();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/path.nonmember/swap.pass.cpp b/test/std/input.output/filesystems/class.path/path.nonmember/swap.pass.cpp
index 554b5129c..51bb03e9f 100644
--- a/test/std/input.output/filesystems/class.path/path.nonmember/swap.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/path.nonmember/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 
 // NOTE: this is tested in path.members/path.modifiers via the member swap.
-int main()
+int main(int, char**)
 {
   using namespace fs;
   const char* value1 = "foo/bar/baz";
@@ -46,4 +45,6 @@ int main()
     assert(p1.native() == value1);
     assert(p2.native() == value2);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.path/synop.pass.cpp b/test/std/input.output/filesystems/class.path/synop.pass.cpp
index 875f92fb6..8aa186e32 100644
--- a/test/std/input.output/filesystems/class.path/synop.pass.cpp
+++ b/test/std/input.output/filesystems/class.path/synop.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 
 
-int main() {
+int main(int, char**) {
   using namespace fs;
   ASSERT_SAME_TYPE(path::value_type, char);
   ASSERT_SAME_TYPE(path::string_type, std::basic_string<path::value_type>);
@@ -35,4 +34,6 @@ int main() {
     const char* dummy = &path::preferred_separator;
     ((void)dummy);
   }
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp
index 40ce491b7..9179908a6 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp
index 00c8c35fc..de97832c4 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp
index e02d6679c..114285e8f 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp
index 9b239c6bf..47b344a7f 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/depth.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp
index 799494f1b..a24559c68 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/disable_recursion_pending.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp
index 2d30cc3b8..ea9f4de5d 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp
index e258c45e3..c203106d8 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp
index 61bb8724b..7a41ada56 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp
index fe6ce5ff3..2cf363821 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/pop.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp
index 662c11446..1ffe664ca 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.members/recursion_pending.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp
index 9807309f4..91f20717a 100644
--- a/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp
+++ b/test/std/input.output/filesystems/class.rec.dir.itr/rec.dir.itr.nonmembers/begin_end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.enum/enum.copy_options.pass.cpp b/test/std/input.output/filesystems/fs.enum/enum.copy_options.pass.cpp
index 75477309f..b949960df 100644
--- a/test/std/input.output/filesystems/fs.enum/enum.copy_options.pass.cpp
+++ b/test/std/input.output/filesystems/fs.enum/enum.copy_options.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 constexpr fs::copy_options ME(int val) { return static_cast<fs::copy_options>(val); }
 
-int main() {
+int main(int, char**) {
   typedef fs::copy_options E;
   static_assert(std::is_enum<E>::value, "");
 
@@ -60,4 +59,6 @@ int main() {
           E::create_symlinks     == ME(128) &&
           E::create_hard_links   == ME(256),
         "Expected enumeration values do not match");
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.enum/enum.directory_options.pass.cpp b/test/std/input.output/filesystems/fs.enum/enum.directory_options.pass.cpp
index db40f6de9..43b094597 100644
--- a/test/std/input.output/filesystems/fs.enum/enum.directory_options.pass.cpp
+++ b/test/std/input.output/filesystems/fs.enum/enum.directory_options.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 constexpr fs::directory_options ME(int val) { return static_cast<fs::directory_options>(val); }
 
-int main() {
+int main(int, char**) {
   typedef fs::directory_options E;
   static_assert(std::is_enum<E>::value, "");
 
@@ -42,4 +41,6 @@ int main() {
         E::skip_permission_denied   == ME(2),
         "Expected enumeration values do not match");
 
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.enum/enum.file_type.pass.cpp b/test/std/input.output/filesystems/fs.enum/enum.file_type.pass.cpp
index 899ab6820..c1f16079a 100644
--- a/test/std/input.output/filesystems/fs.enum/enum.file_type.pass.cpp
+++ b/test/std/input.output/filesystems/fs.enum/enum.file_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 constexpr fs::file_type ME(int val) { return static_cast<fs::file_type>(val); }
 
-int main() {
+int main(int, char**) {
   typedef fs::file_type E;
   static_assert(std::is_enum<E>::value, "");
 
@@ -44,4 +43,6 @@ int main() {
           E::socket == ME(7) &&
           E::unknown == ME(8),
         "Expected enumeration values do not match");
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.enum/enum.path.format.pass.cpp b/test/std/input.output/filesystems/fs.enum/enum.path.format.pass.cpp
index d4ec48e84..d60225d4f 100644
--- a/test/std/input.output/filesystems/fs.enum/enum.path.format.pass.cpp
+++ b/test/std/input.output/filesystems/fs.enum/enum.path.format.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   typedef fs::path::format E;
   static_assert(std::is_enum<E>::value, "");
 
@@ -35,4 +34,6 @@ int main() {
           E::auto_format   != E::generic_format &&
           E::native_format != E::generic_format,
         "Expected enumeration values are not unique");
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.enum/enum.perm_options.pass.cpp b/test/std/input.output/filesystems/fs.enum/enum.perm_options.pass.cpp
index 5af504530..1fd353d04 100644
--- a/test/std/input.output/filesystems/fs.enum/enum.perm_options.pass.cpp
+++ b/test/std/input.output/filesystems/fs.enum/enum.perm_options.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ constexpr fs::perm_options ME(int val) {
   return static_cast<fs::perm_options>(val);
 }
 
-int main() {
+int main(int, char**) {
   typedef fs::perm_options E;
   static_assert(std::is_enum<E>::value, "");
 
@@ -45,4 +44,6 @@ int main() {
         E::remove   == ME(4) &&
         E::nofollow == ME(8),
         "Expected enumeration values do not match");
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.enum/enum.perms.pass.cpp b/test/std/input.output/filesystems/fs.enum/enum.perms.pass.cpp
index 9f2e4e214..93b5278fd 100644
--- a/test/std/input.output/filesystems/fs.enum/enum.perms.pass.cpp
+++ b/test/std/input.output/filesystems/fs.enum/enum.perms.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 constexpr fs::perms ME(int val) { return static_cast<fs::perms>(val); }
 
-int main() {
+int main(int, char**) {
   typedef fs::perms E;
   static_assert(std::is_enum<E>::value, "");
 
@@ -61,4 +60,6 @@ int main() {
         E::mask         == ME(07777) &&
         E::unknown      == ME(0xFFFF),
         "Expected enumeration values do not match");
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.error.report/tested_elsewhere.pass.cpp b/test/std/input.output/filesystems/fs.error.report/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/filesystems/fs.error.report/tested_elsewhere.pass.cpp
+++ b/test/std/input.output/filesystems/fs.error.report/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.filesystem.synopsis/file_time_type.pass.cpp b/test/std/input.output/filesystems/fs.filesystem.synopsis/file_time_type.pass.cpp
index 157083a30..e88ef1d12 100644
--- a/test/std/input.output/filesystems/fs.filesystem.synopsis/file_time_type.pass.cpp
+++ b/test/std/input.output/filesystems/fs.filesystem.synopsis/file_time_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,9 @@ void test_time_point_resolution_and_range() {
   ASSERT_SAME_TYPE(Period, std::nano);
 }
 
-int main() {
+int main(int, char**) {
   test_trivial_clock();
   test_time_point_resolution_and_range();
+
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp
index b2a5794a5..2f06fd165 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.absolute/absolute.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp
index eb10d9816..7717c261e 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.canonical/canonical.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp
index ba579d0af..c791a7436 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp
index a67b431fb..90da3b535 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp
index 61733d526..f419039fa 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_file/copy_file_large.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp
index ee4a9ed4b..e687ee5de 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.copy_symlink/copy_symlink.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp
index 6b651dfb0..c7a72038a 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directories/create_directories.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp
index e73e21ffb..f512a30ef 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp
index f013bbb20..796b7a72a 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory/create_directory_with_attributes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp
index f1d9ff041..e4bf09074 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_directory_symlink/create_directory_symlink.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp
index f1ffc74c2..b645ccbc2 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_hard_link/create_hard_link.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp
index e69aae186..a2658a51e 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.create_symlink/create_symlink.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp
index dd3736e08..41136a7a9 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.current_path/current_path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp
index 392f66c6d..ebe4fc67b 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.equivalent/equivalent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp
index 916052b74..2ae1c41e6 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.exists/exists.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp
index 60e0042cf..3d597b046 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.file_size/file_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp
index 2e9704a3d..55527c908 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.hard_lk_ct/hard_link_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp
index 36f1d6bbd..fbfb62c0e 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_block_file/is_block_file.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp
index b0c3fe542..e011dce07 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_char_file/is_character_file.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp
index bb578b9cf..049129834 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_directory/is_directory.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp
index cd4dd1748..8a8fc50f6 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_empty/is_empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp
index 3c86dc0e7..8cf036dfd 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_fifo/is_fifo.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp
index a2134c7c1..fb7107060 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_other/is_other.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp
index 0c3488635..55d97f2e2 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_regular_file/is_regular_file.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp
index 7273c6c2e..f0d894c99 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_socket/is_socket.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp
index e1ac98a80..8d1723571 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.is_symlink/is_symlink.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
index 11152e6ab..5e26e8e10 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -125,7 +124,7 @@ TimeSpec LastAccessTime(path const& p) { return GetTimes(p).access; }
 
 TimeSpec LastWriteTime(path const& p) { return GetTimes(p).write; }
 
-std::pair<TimeSpec, TimeSpec> GetSymlinkTimes(path const& p) {
+Times GetSymlinkTimes(path const& p) {
   StatT st;
   if (::lstat(p.c_str(), &st) == -1) {
     std::error_code ec(errno, std::generic_category());
@@ -136,7 +135,10 @@ std::pair<TimeSpec, TimeSpec> GetSymlinkTimes(path const& p) {
         std::exit(EXIT_FAILURE);
 #endif
     }
-    return {extract_atime(st), extract_mtime(st)};
+    Times res;
+    res.access = extract_atime(st);
+    res.write = extract_mtime(st);
+    return res;
 }
 
 namespace {
@@ -500,9 +502,8 @@ TEST_CASE(last_write_time_symlink_test)
 
     TEST_CHECK(CompareTime(LastWriteTime(file), new_time));
     TEST_CHECK(CompareTime(LastAccessTime(sym), old_times.access));
-    std::pair<TimeSpec, TimeSpec> sym_times = GetSymlinkTimes(sym);
-    TEST_CHECK(CompareTime(sym_times.first, old_sym_times.first));
-    TEST_CHECK(CompareTime(sym_times.second, old_sym_times.second));
+    Times sym_times = GetSymlinkTimes(sym);
+    TEST_CHECK(CompareTime(sym_times.write, old_sym_times.write));
 }
 
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp
index b5fb838dd..434fcea1d 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.permissions/permissions.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp
index 5f7b30dd6..a7c498434 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.proximate/proximate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,12 +74,12 @@ TEST_CASE(basic_test) {
       {"a", parent_cwd, "fs.op.proximate/a"},
       {"/", "a", dot_dot_to_root / ".."},
       {"/", "a/b", dot_dot_to_root / "../.."},
-      {"/", "a/b/", dot_dot_to_root / "../../.."},
+      {"/", "a/b/", dot_dot_to_root / "../.."},
       {"a", "/", relative_cwd / "a"},
       {"a/b", "/", relative_cwd / "a/b"},
       {"a", "/net", ".." / relative_cwd / "a"},
-      {"//foo/", "//foo", "/foo/"},
-      {"//foo", "//foo/", ".."},
+      {"//foo/", "//foo", "."},
+      {"//foo", "//foo/", "."},
       {"//foo", "//foo", "."},
       {"//foo/", "//foo/", "."},
       {"//base", "a", dot_dot_to_root / "../base"},
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp
index 43dfec834..488738eb5 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.read_symlink/read_symlink.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp
index e240c6496..fd9bac796 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.relative/relative.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,8 @@
 // path proximate(const path& p, const path& base, error_code& ec);
 
 #include "filesystem_include.hpp"
+#include <string>
 #include <type_traits>
-#include <vector>
-#include <iostream>
 #include <cassert>
 
 #include "test_macros.h"
@@ -30,49 +28,90 @@
 
 TEST_SUITE(filesystem_proximate_path_test_suite)
 
-TEST_CASE(test_signature) {
+TEST_CASE(test_signature_0) {
+  fs::path p("");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(fs::current_path()));
+}
+
+TEST_CASE(test_signature_1) {
+  fs::path p(".");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(fs::current_path()));
+}
 
+TEST_CASE(test_signature_2) {
+  fs::path p(StaticEnv::File);
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::File));
 }
-int main() {
-  // clang-format off
-  struct {
-    std::string input;
-    std::string expect;
-  } TestCases[] = {
-      {"", fs::current_path()},
-      {".", fs::current_path()},
-      {StaticEnv::File, StaticEnv::File},
-      {StaticEnv::Dir, StaticEnv::Dir},
-      {StaticEnv::SymlinkToDir, StaticEnv::Dir},
-      {StaticEnv::SymlinkToDir / "dir2/.", StaticEnv::Dir / "dir2"},
-      // FIXME? If the trailing separator occurs in a part of the path that exists,
-      // it is ommitted. Otherwise it is added to the end of the result.
-      {StaticEnv::SymlinkToDir / "dir2/./", StaticEnv::Dir / "dir2"},
-      {StaticEnv::SymlinkToDir / "dir2/DNE/./", StaticEnv::Dir / "dir2/DNE/"},
-      {StaticEnv::SymlinkToDir / "dir2", StaticEnv::Dir2},
-      {StaticEnv::SymlinkToDir / "dir2/../dir2/DNE/..", StaticEnv::Dir2 / ""},
-      {StaticEnv::SymlinkToDir / "dir2/dir3/../DNE/DNE2", StaticEnv::Dir2 / "DNE/DNE2"},
-      {StaticEnv::Dir / "../dir1", StaticEnv::Dir},
-      {StaticEnv::Dir / "./.", StaticEnv::Dir},
-      {StaticEnv::Dir / "DNE/../foo", StaticEnv::Dir / "foo"}
-  };
-  // clang-format on
-  int ID = 0;
-  bool Failed = false;
-  for (auto& TC : TestCases) {
-    ++ID;
-    fs::path p(TC.input);
-    const fs::path output = fs::weakly_canonical(p);
-    if (output != TC.expect) {
-      Failed = true;
-      std::cerr << "TEST CASE #" << ID << " FAILED: \n";
-      std::cerr << "  Input: '" << TC.input << "'\n";
-      std::cerr << "  Expected: '" << TC.expect << "'\n";
-      std::cerr << "  Output: '" << output.native() << "'";
-      std::cerr << std::endl;
-    }
-  }
-  return Failed;
+
+TEST_CASE(test_signature_3) {
+  fs::path p(StaticEnv::Dir);
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir));
+}
+
+TEST_CASE(test_signature_4) {
+  fs::path p(StaticEnv::SymlinkToDir);
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir));
+}
+
+TEST_CASE(test_signature_5) {
+  fs::path p(StaticEnv::SymlinkToDir / "dir2/.");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir / "dir2"));
+}
+
+TEST_CASE(test_signature_6) {
+  // FIXME? If the trailing separator occurs in a part of the path that exists,
+  // it is ommitted. Otherwise it is added to the end of the result.
+  fs::path p(StaticEnv::SymlinkToDir / "dir2/./");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir / "dir2"));
+}
+
+TEST_CASE(test_signature_7) {
+  fs::path p(StaticEnv::SymlinkToDir / "dir2/DNE/./");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir / "dir2/DNE/"));
+}
+
+TEST_CASE(test_signature_8) {
+  fs::path p(StaticEnv::SymlinkToDir / "dir2");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir2));
+}
+
+TEST_CASE(test_signature_9) {
+  fs::path p(StaticEnv::SymlinkToDir / "dir2/../dir2/DNE/..");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir2 / ""));
+}
+
+TEST_CASE(test_signature_10) {
+  fs::path p(StaticEnv::SymlinkToDir / "dir2/dir3/../DNE/DNE2");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir2 / "DNE/DNE2"));
+}
+
+TEST_CASE(test_signature_11) {
+  fs::path p(StaticEnv::Dir / "../dir1");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir));
+}
+
+TEST_CASE(test_signature_12) {
+  fs::path p(StaticEnv::Dir / "./.");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir));
+}
+
+TEST_CASE(test_signature_13) {
+  fs::path p(StaticEnv::Dir / "DNE/../foo");
+  const fs::path output = fs::weakly_canonical(p);
+  TEST_CHECK(output == std::string(StaticEnv::Dir / "foo"));
 }
 
 TEST_SUITE_END()
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp
index 37b47f151..3fb20524a 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove/remove.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp
index 0f015c387..523ce5f06 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp
index e2ebdc61f..8373d67b8 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.rename/rename.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp
index 1a2df47e6..43ce5b060 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.resize_file/resize_file.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp
index 2c2e75af6..7bb6c55fa 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp
index ab72f2e5d..93444bb00 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.status/status.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp
index d74ced643..93a251c84 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.status_known/status_known.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp
index fac630da1..a4d883dba 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.symlink_status/symlink_status.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp
index 523e429cf..fbce59168 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.temp_dir_path/temp_directory_path.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/input.output/filesystems/fs.op.funcs/fs.op.weakly_canonical/weakly_canonical.pass.cpp b/test/std/input.output/filesystems/fs.op.funcs/fs.op.weakly_canonical/weakly_canonical.pass.cpp
index 0fe058ffd..94a8e13bc 100644
--- a/test/std/input.output/filesystems/fs.op.funcs/fs.op.weakly_canonical/weakly_canonical.pass.cpp
+++ b/test/std/input.output/filesystems/fs.op.funcs/fs.op.weakly_canonical/weakly_canonical.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "filesystem_test_helper.hpp"
 
 
-int main() {
+int main(int, char**) {
   // clang-format off
   struct {
     std::string input;
diff --git a/test/std/input.output/filesystems/fs.req.macros/feature_macro.pass.cpp b/test/std/input.output/filesystems/fs.req.macros/feature_macro.pass.cpp
index 071fa800c..dad1868be 100644
--- a/test/std/input.output/filesystems/fs.req.macros/feature_macro.pass.cpp
+++ b/test/std/input.output/filesystems/fs.req.macros/feature_macro.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,4 +25,6 @@
 #endif
 #endif
 
-int main() { }
+int main(int, char**) { 
+  return 0;
+}
diff --git a/test/std/input.output/filesystems/fs.req.namespace/namespace.fail.cpp b/test/std/input.output/filesystems/fs.req.namespace/namespace.fail.cpp
index c61bb2e12..641621e73 100644
--- a/test/std/input.output/filesystems/fs.req.namespace/namespace.fail.cpp
+++ b/test/std/input.output/filesystems/fs.req.namespace/namespace.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,6 +23,8 @@ using namespace std::filesystem;
 // expected-error@-5 {{expected namespace name}}
 #endif
 
-int main() {
+int main(int, char**) {
+
 
+  return 0;
 }
diff --git a/test/std/input.output/filesystems/fs.req.namespace/namespace.pass.cpp b/test/std/input.output/filesystems/fs.req.namespace/namespace.pass.cpp
index 557de3488..658643369 100644
--- a/test/std/input.output/filesystems/fs.req.namespace/namespace.pass.cpp
+++ b/test/std/input.output/filesystems/fs.req.namespace/namespace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 using namespace std::filesystem;
 
-int main() {
+int main(int, char**) {
   static_assert(std::is_same<
           path,
           std::filesystem::path
       >::value, "");
+
+  return 0;
 }
diff --git a/test/std/input.output/input.output.general/nothing_to_do.pass.cpp b/test/std/input.output/input.output.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/input.output.general/nothing_to_do.pass.cpp
+++ b/test/std/input.output/input.output.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/ext.manip/get_money.pass.cpp b/test/std/input.output/iostream.format/ext.manip/get_money.pass.cpp
index 34b65f52d..cb1f2c68e 100644
--- a/test/std/input.output/iostream.format/ext.manip/get_money.pass.cpp
+++ b/test/std/input.output/iostream.format/ext.manip/get_money.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("  -$1,234,567.89");
@@ -73,4 +72,6 @@ int main()
         is >> std::get_money(x, true);
         assert(x == -123456789);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp b/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp
index 7c653f348..ebf62c08e 100644
--- a/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp
+++ b/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("  Sat Dec 31 23:55:59 2061");
@@ -73,4 +72,6 @@ int main()
         assert(is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/ext.manip/put_money.pass.cpp b/test/std/input.output/iostream.format/ext.manip/put_money.pass.cpp
index 92b6c726e..d924d77bc 100644
--- a/test/std/input.output/iostream.format/ext.manip/put_money.pass.cpp
+++ b/test/std/input.output/iostream.format/ext.manip/put_money.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -89,4 +88,6 @@ int main()
         os << std::put_money(x, true);
         assert(sb.str() == L"-USD 1,234,567.89");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp b/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp
index 915efd081..faa99e063 100644
--- a/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp
+++ b/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -84,4 +83,6 @@ int main()
         os << std::put_time(&t, L"%a %b %d %H:%M:%S %Y");
         assert(sb.str() == L"Sat Dec 31 23:55:59 2061");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/member_swap.pass.cpp b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/member_swap.pass.cpp
index f4d425728..44b394b8f 100644
--- a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct test_iostream
     void swap(test_iostream& s) {base::swap(s);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb1;
@@ -82,4 +81,6 @@ int main()
         assert(is2.precision() == 6);
         assert(is2.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/move_assign.pass.cpp b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/move_assign.pass.cpp
index cf6c8ae68..c7918ec8d 100644
--- a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/move_assign.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct test_iostream
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb1;
@@ -87,4 +86,6 @@ int main()
         assert(is2.precision() == 6);
         assert(is2.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/move.pass.cpp b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/move.pass.cpp
index e8fd00c7a..611a7a670 100644
--- a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/move.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct test_iostream
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -73,4 +72,6 @@ int main()
         assert(is.precision() == 6);
         assert(is.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/streambuf.pass.cpp b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/streambuf.pass.cpp
index dacc8d26d..c12abc0e2 100644
--- a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/streambuf.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.cons/streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -52,4 +51,6 @@ int main()
         assert(is.getloc().name() == "C");
         assert(is.gcount() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.dest/nothing_to_do.pass.cpp b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.dest/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.dest/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/iostreamclass/iostream.dest/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/iostreamclass/types.pass.cpp b/test/std/input.output/iostream.format/input.streams/iostreamclass/types.pass.cpp
index 6890f1cf7..46d7a16aa 100644
--- a/test/std/input.output/iostream.format/input.streams/iostreamclass/types.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/iostreamclass/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <istream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_istream<char>, std::basic_iostream<char> >::value), "");
     static_assert((std::is_base_of<std::basic_ostream<char>, std::basic_iostream<char> >::value), "");
@@ -34,4 +33,6 @@ int main()
     static_assert((std::is_same<std::basic_iostream<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_iostream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_iostream<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp
index beaebfe85..799ec5eae 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp
index 1c8716e86..9f9872d9e 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp
index f5ef23e65..c2b937a89 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/float.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp
index 8d1261137..702287be7 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -77,4 +76,6 @@ int main()
         assert(!is.eof());
         assert( is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp
index 4b4765452..9f9118cbc 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp
index cc70faed6..bdd30190a 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp
index c37e17516..1612468f4 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp
index eda490f8d..0893d8cde 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -98,4 +97,6 @@ int main()
         assert( is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp
index 22a760da6..a0d96c398 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/short.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -77,4 +76,6 @@ int main()
         assert(!is.eof());
         assert( is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp
index 6f1091690..578cfcf0c 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp
index eb8a7231f..f1c150d79 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp
index 1db250ed4..068d31ac8 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp
index 78fdc6638..9906bbeac 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.arithmetic/unsigned_short.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(!is.eof());
         assert(!is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.reqmts/tested_elsewhere.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.reqmts/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.reqmts/tested_elsewhere.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream.formatted.reqmts/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/basic_ios.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/basic_ios.pass.cpp
index 0d4516d55..704c4997d 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/basic_ios.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/basic_ios.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,11 +27,13 @@ f(std::basic_ios<CharT>& is)
     return is;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
         is >> f;
         assert(f_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/chart.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/chart.pass.cpp
index b5068220c..cbb606cdc 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/chart.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/chart.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("          ");
@@ -84,4 +83,6 @@ int main()
         assert(!is.fail());
         assert(c == L'c');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/ios_base.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/ios_base.pass.cpp
index d4cb2bb13..ec25dc5a7 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/ios_base.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/ios_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@ f(std::ios_base& is)
     return is;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
         is >> f;
         assert(f_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/istream.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/istream.pass.cpp
index 4c3aef491..f3829c25a 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/istream.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/istream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,11 +27,13 @@ f(std::basic_istream<CharT>& is)
     return is;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((std::streambuf*)0);
         is >> f;
         assert(f_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char.pass.cpp
index a02fe2c51..bd06de6a0 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("          ");
@@ -67,4 +66,6 @@ int main()
         assert(!is.fail());
         assert(c == 'c');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char_pointer.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char_pointer.pass.cpp
index b815246d6..d5128339a 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/signed_char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("   abcdefghijk    ");
@@ -104,4 +103,6 @@ int main()
         assert(std::string((char*)s) == "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp
index 5afc56d8a..9feb82690 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("testing...");
@@ -66,4 +65,6 @@ int main()
         assert(sb2.str() == "testing...");
         assert(is.gcount() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char.pass.cpp
index 8f19cea7b..3eceaaeb6 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("          ");
@@ -67,4 +66,6 @@ int main()
         assert(!is.fail());
         assert(c == 'c');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char_pointer.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char_pointer.pass.cpp
index 1e98b7dfd..14b299314 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/unsigned_char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("   abcdefghijk    ");
@@ -104,4 +103,6 @@ int main()
         assert(std::string((char*)s) == "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/wchar_t_pointer.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/wchar_t_pointer.pass.cpp
index 82e460db9..f0a9e0710 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/wchar_t_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/istream_extractors/wchar_t_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("   abcdefghijk    ");
@@ -115,4 +114,6 @@ int main()
         assert(std::string(s) == "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.formatted/nothing_to_do.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.formatted/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.formatted/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.formatted/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.manip/ws.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.manip/ws.pass.cpp
index 3c8159a6d..6786ebf4c 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.manip/ws.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.manip/ws.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("   123");
@@ -76,4 +75,6 @@ int main()
         assert(is.eof());
         assert(is.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.rvalue/rvalue.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.rvalue/rvalue.pass.cpp
index 230a59a88..8d0af7347 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.rvalue/rvalue.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.rvalue/rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ struct A{};
 bool called = false;
 void operator>>(std::istream&, A&&){ called = true; }
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("   123");
@@ -69,4 +68,6 @@ int main()
         assert(&out == &ss);
         assert(called);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
index 0f356e26d..40a041741 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("          ");
@@ -97,4 +96,6 @@ int main()
         assert(c == L'c');
         assert(is.gcount() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
index cf06e343b..ae31c9be0 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("          ");
@@ -100,4 +99,6 @@ int main()
         assert(c == L'c');
         assert(is.gcount() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp
index 83fd40bef..149392cae 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("  \n    \n ");
@@ -159,4 +158,6 @@ int main()
         assert(is.gcount() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp
index 8b42bae55..e7c96d6a2 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_pointer_size_chart.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("  *    * ");
@@ -159,4 +158,6 @@ int main()
         assert(is.gcount() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp
index 0a48393e0..dda59d7ff 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("testing\n...");
@@ -85,4 +84,6 @@ int main()
         assert(!is.fail());
         assert(is.gcount() == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp
index c6368b44a..a1e46c233 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/get_streambuf_chart.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("testing*...");
@@ -86,4 +85,6 @@ int main()
         assert(!is.fail());
         assert(is.gcount() == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp
index f17aa1623..9c91053eb 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("  \n    \n ");
@@ -143,4 +142,6 @@ int main()
         assert(is.gcount() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp
index 5c6a3c59f..bee1976e9 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/getline_pointer_size_chart.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("  *    * ");
@@ -143,4 +142,6 @@ int main()
         assert(is.gcount() == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp
index 9510961a4..7f6348b01 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 1\n2345\n6");
@@ -73,4 +72,6 @@ int main()
         assert(!is.fail());
         assert(is.gcount() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp
index 3095712b9..acf90e560 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int bad=-1;
     std::ostringstream os;
@@ -31,4 +30,6 @@ int main()
     is.ignore(ignoreLen);
     std::istringstream::pos_type b=is.tellg();
     assert((b-a)==ignoreLen);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp
index 4264849a0..17943463e 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/peek.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 1\n2345\n6");
@@ -66,4 +65,6 @@ int main()
         assert(!is.fail());
         assert(is.gcount() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/putback.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/putback.pass.cpp
index 3564d710b..4ca3a8c0e 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/putback.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/putback.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 123456789");
@@ -86,4 +85,6 @@ int main()
         assert(is.bad());
         assert(is.gcount() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
index 20e70cfbd..9296e0bfb 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 123456789");
@@ -78,4 +77,6 @@ int main()
         assert( is.fail());
         assert(is.gcount() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/readsome.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/readsome.pass.cpp
index 01eecb5d8..f99752cc1 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/readsome.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/readsome.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 1234567890");
@@ -82,4 +81,6 @@ int main()
         assert(std::wstring(s, 1) == L"0");
         assert(is.readsome(s, 5) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg.pass.cpp
index dc4e0ba0d..c16a63978 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 123456789");
@@ -72,4 +71,6 @@ int main()
         assert(is.good());
         assert(!is.eof());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
index 3b7417ab2..93a7f1912 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 123456789");
@@ -84,4 +83,6 @@ int main()
         assert(is.good());
         assert(!is.eof());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/sync.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/sync.pass.cpp
index 61db67cd5..43ddd8110 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/sync.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/sync.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 123456789");
@@ -61,4 +60,6 @@ int main()
         assert(is.sync() == 0);
         assert(sync_called == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/tellg.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/tellg.pass.cpp
index 799b46b97..918685b86 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/tellg.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/tellg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 123456789");
@@ -60,4 +59,6 @@ int main()
         std::wistream is(&sb);
         assert(is.tellg() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream.unformatted/unget.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream.unformatted/unget.pass.cpp
index adf0a6117..ca00af4e3 100644
--- a/test/std/input.output/iostream.format/input.streams/istream.unformatted/unget.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream.unformatted/unget.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
     CharT* egptr() const {return base::egptr();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb(" 123456789");
@@ -78,4 +77,6 @@ int main()
         assert(is.bad());
         assert(is.gcount() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream/istream.assign/member_swap.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream/istream.assign/member_swap.pass.cpp
index a0734b801..dbb2bb69e 100644
--- a/test/std/input.output/iostream.format/input.streams/istream/istream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream/istream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct test_istream
     void swap(test_istream& s) {base::swap(s);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb1;
@@ -82,4 +81,6 @@ int main()
         assert(is2.precision() == 6);
         assert(is2.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream/istream.assign/move_assign.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream/istream.assign/move_assign.pass.cpp
index 18887b75d..455edbf72 100644
--- a/test/std/input.output/iostream.format/input.streams/istream/istream.assign/move_assign.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream/istream.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct test_istream
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb1;
@@ -87,4 +86,6 @@ int main()
         assert(is2.precision() == 6);
         assert(is2.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream/istream.cons/copy.fail.cpp b/test/std/input.output/iostream.format/input.streams/istream/istream.cons/copy.fail.cpp
index c5721f211..017cc67a1 100644
--- a/test/std/input.output/iostream.format/input.streams/istream/istream.cons/copy.fail.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream/istream.cons/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,9 @@ struct test_istream
 };
 
 
-int main()
+int main(int, char**)
 {
 
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream/istream.cons/move.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream/istream.cons/move.pass.cpp
index 6e00f3993..4830d04d4 100644
--- a/test/std/input.output/iostream.format/input.streams/istream/istream.cons/move.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream/istream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct test_istream
         : base(std::move(s)) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -71,4 +70,6 @@ int main()
         assert(is.precision() == 6);
         assert(is.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream/istream.cons/streambuf.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream/istream.cons/streambuf.pass.cpp
index 74ed57dae..339489dfb 100644
--- a/test/std/input.output/iostream.format/input.streams/istream/istream.cons/streambuf.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream/istream.cons/streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -52,4 +51,6 @@ int main()
         assert(is.getloc().name() == "C");
         assert(is.gcount() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream/istream_sentry/ctor.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream/istream_sentry/ctor.pass.cpp
index 910b36931..fdebd66fb 100644
--- a/test/std/input.output/iostream.format/input.streams/istream/istream_sentry/ctor.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream/istream_sentry/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::istream is((testbuf<char>*)0);
@@ -125,4 +124,6 @@ int main()
         assert(sync_called == 0);
         assert(sb.gptr() == sb.eback());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/input.streams/istream/types.pass.cpp b/test/std/input.output/iostream.format/input.streams/istream/types.pass.cpp
index 36cc2029d..a5362d94b 100644
--- a/test/std/input.output/iostream.format/input.streams/istream/types.pass.cpp
+++ b/test/std/input.output/iostream.format/input.streams/istream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <istream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_ios<char>, std::basic_istream<char> >::value), "");
     static_assert((std::is_same<std::basic_istream<char>::char_type, char>::value), "");
@@ -32,4 +31,6 @@ int main()
     static_assert((std::is_same<std::basic_istream<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_istream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_istream<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/nothing_to_do.pass.cpp b/test/std/input.output/iostream.format/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostream.format/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostream.format/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.assign/member_swap.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.assign/member_swap.pass.cpp
index 8214d6c05..433d78ead 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct test_ostream
     void swap(test_ostream& s) {base::swap(s);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb1;
@@ -82,4 +81,6 @@ int main()
         assert(os2.precision() == 6);
         assert(os2.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.assign/move_assign.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.assign/move_assign.pass.cpp
index 1b58a9a52..4241b02a3 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.assign/move_assign.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct test_ostream
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb1;
@@ -87,4 +86,6 @@ int main()
         assert(os2.precision() == 6);
         assert(os2.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.cons/move.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.cons/move.pass.cpp
index 7d225d495..811b7fa85 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.cons/move.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct test_ostream
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -69,4 +68,6 @@ int main()
         assert(os.precision() == 6);
         assert(os.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.cons/streambuf.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.cons/streambuf.pass.cpp
index 7929e1845..78a3a53c7 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.cons/streambuf.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.cons/streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -50,4 +49,6 @@ int main()
         assert(os.precision() == 6);
         assert(os.getloc().name() == "C");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/nothing_to_do.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.formatted.reqmts/tested_elsewhere.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.formatted.reqmts/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.formatted.reqmts/tested_elsewhere.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.formatted.reqmts/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/bool.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/bool.pass.cpp
index 00332f773..a0622b365 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/bool.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -88,4 +87,6 @@ int main()
         os << b;
         assert(sb.str() == "false");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/double.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/double.pass.cpp
index 1ee2c565a..2c83723cb 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/double.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "-10.5");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/float.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/float.pass.cpp
index db64b6603..851086abe 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/float.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/float.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "-10.5");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/int.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/int.pass.cpp
index 5e601a90c..7dae78f9d 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/int.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fffffff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long.pass.cpp
index 125c0800a..8f2ec631c 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fffffff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_double.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_double.pass.cpp
index 4b235f405..b0c9950bd 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_double.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "-10.5");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_long.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_long.pass.cpp
index 44b189d50..d87096f72 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_long.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fffffffffffffff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp
index 9e602d4e7..6db1b55cc 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ static void test(std::ios_base::fmtflags fmt, const char *expected)
     assert(ss.str() == expected);
 }
 
-int main(void)
+int main(int, char**)
 {
     const std::ios_base::fmtflags o = std::ios_base::oct;
     const std::ios_base::fmtflags d = std::ios_base::dec;
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp
index 54c8a2838..c2b188a15 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minus1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ void test_hex(const char *expected)
     assert(str == expected);
 }
 
-int main()
+int main(int, char**)
 {
 
     test_octal<uint16_t>(                "177777");
@@ -111,4 +110,6 @@ int main()
         test_hex<unsigned long long>("FFFFFFFFFFFFFFFF");
         test_hex<         long long>("FFFFFFFFFFFFFFFF");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/pointer.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/pointer.pass.cpp
index a8bdaba86..f400f3354 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -88,4 +87,6 @@ int main()
         os << n;
         assert(os.good());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/short.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/short.pass.cpp
index 06b6e5c62..c45d5797b 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/short.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/short.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_int.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_int.pass.cpp
index e6070ef91..c24381923 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_int.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long.pass.cpp
index 7f8cf4608..03b639643 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fffffff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long_long.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long_long.pass.cpp
index 59be66fb6..3c12f1488 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long_long.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fffffffffffffff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_short.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_short.pass.cpp
index 6508f2dab..6cc4c71a0 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_short.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/unsigned_short.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -80,4 +79,6 @@ int main()
         os << n;
         assert(sb.str() == "fff6");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT.pass.cpp
index 26bfd89dc..127c0c7dc 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::wostream os((std::wstreambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == L"a    ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT_pointer.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT_pointer.pass.cpp
index 1f05684b5..85edde06d 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/CharT_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::wostream os((std::wstreambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == L"123  ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char.pass.cpp
index 0fe2c352e..5532a6865 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == "a    ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_pointer.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_pointer.pass.cpp
index f5e8ad40d..f6e2445fa 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == "123  ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide.pass.cpp
index 09784c034..f12478e53 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::wostream os((std::wstreambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == L"a    ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide_pointer.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide_pointer.pass.cpp
index 2e40cf406..1b11d8550 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/char_to_wide_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::wostream os((std::wstreambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == L"123  ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char.pass.cpp
index 8ed0bfbdb..26f295ec2 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == "a    ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char_pointer.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char_pointer.pass.cpp
index e3ff0470a..83143521b 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == "123  ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char.pass.cpp
index 32c044d72..e45281f86 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == "a    ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char_pointer.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char_pointer.pass.cpp
index 199c5dfd9..55b429b2d 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/unsigned_char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -85,4 +84,6 @@ int main()
         assert(sb.str() == "123  ");
         assert(os.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/basic_ios.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/basic_ios.pass.cpp
index 9d45af0fd..921311f99 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/basic_ios.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/basic_ios.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ f(std::basic_ios<CharT>& os)
     return os;
 }
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -67,4 +66,6 @@ int main()
         os << f;
         assert( (os.flags() & std::ios_base::uppercase));
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ios_base.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ios_base.pass.cpp
index 21260d364..b10330b7c 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ios_base.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ios_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -58,4 +57,6 @@ int main()
         os << std::uppercase;
         assert( (os.flags() & std::ios_base::uppercase));
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ostream.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ostream.pass.cpp
index d4516d2f8..e57e5412c 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ostream.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ostream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ f(std::basic_ostream<CharT>& os)
     return os;
 }
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -66,4 +65,6 @@ int main()
         os << f;
         assert(sb.str() == "testing...");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp
index e510825b6..d2935ca73 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -66,4 +65,6 @@ int main()
         os << &sb2;
         assert(sb.str() == "testing...");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.manip/endl.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.manip/endl.pass.cpp
index 9e8a5c8f0..03cd41129 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.manip/endl.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.manip/endl.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -77,4 +76,6 @@ int main()
         assert(sync_called == 2);
         assert(os.good());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.manip/ends.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.manip/ends.pass.cpp
index f37270150..5f18aecf9 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.manip/ends.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.manip/ends.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -68,4 +67,6 @@ int main()
         assert(sb.str().back() == 0);
         assert(os.good());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.manip/flush.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.manip/flush.pass.cpp
index 088826c3d..666a92532 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.manip/flush.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.manip/flush.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -55,4 +54,6 @@ int main()
         assert(sync_called == 2);
         assert(os.good());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.rvalue/CharT_pointer.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.rvalue/CharT_pointer.pass.cpp
index f04d468ad..724593f1a 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.rvalue/CharT_pointer.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.rvalue/CharT_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ protected:
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -67,4 +66,6 @@ int main()
         std::wostream(&sb) << L"123";
         assert(sb.str() == L"123");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp.pass.cpp
index bed0d72af..7be006f10 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         seekpos_called = 0;
@@ -65,4 +64,6 @@ int main()
         assert(seekpos_called == 1);
         assert(os.rdstate() == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp
index eb76cbf9d..dc8e5ed5c 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         seekoff_called = 0;
@@ -67,4 +66,6 @@ int main()
         assert(seekoff_called == 1);
         assert(os.rdstate() == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.seeks/tellp.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.seeks/tellp.pass.cpp
index 10a229d38..d9361e839 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.seeks/tellp.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.seeks/tellp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -51,4 +50,6 @@ int main()
         assert(os.tellp() == 10);
         assert(seekoff_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.unformatted/flush.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.unformatted/flush.pass.cpp
index 97791f4c7..15a3b59ea 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.unformatted/flush.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.unformatted/flush.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -51,4 +50,6 @@ int main()
         assert(os.bad());
         assert(sync_called == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.unformatted/put.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.unformatted/put.pass.cpp
index 87a94ed42..79f7d9f9f 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.unformatted/put.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.unformatted/put.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::wostream os((std::wstreambuf*)0);
@@ -73,4 +72,6 @@ int main()
         assert(sb.str() == "a");
         assert(os.good());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream.unformatted/write.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream.unformatted/write.pass.cpp
index 71f9ad66b..9ebfdf54b 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream.unformatted/write.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream.unformatted/write.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ protected:
         }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::wostream os((std::wstreambuf*)0);
@@ -73,4 +72,6 @@ int main()
         assert(sb.str() == s);
         assert(os.good());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream/types.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream/types.pass.cpp
index 41ce0346c..e0e9cddde 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream/types.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <ostream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_ios<char>, std::basic_ostream<char> >::value), "");
     static_assert((std::is_same<std::basic_ostream<char>::char_type, char>::value), "");
@@ -32,4 +31,6 @@ int main()
     static_assert((std::is_same<std::basic_ostream<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_ostream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_ostream<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream_sentry/construct.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream_sentry/construct.pass.cpp
index 991fdfb35..c21776a9a 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream_sentry/construct.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream_sentry/construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -58,4 +57,6 @@ int main()
         assert(bool(s));
         assert(sync_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/output.streams/ostream_sentry/destruct.pass.cpp b/test/std/input.output/iostream.format/output.streams/ostream_sentry/destruct.pass.cpp
index d351c565e..66ed0acba 100644
--- a/test/std/input.output/iostream.format/output.streams/ostream_sentry/destruct.pass.cpp
+++ b/test/std/input.output/iostream.format/output.streams/ostream_sentry/destruct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ostream os((std::streambuf*)0);
@@ -76,4 +75,6 @@ int main()
         assert(sync_called == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/quoted.manip/quoted.pass.cpp b/test/std/input.output/iostream.format/quoted.manip/quoted.pass.cpp
index 8f07742c6..b87797da5 100644
--- a/test/std/input.output/iostream.format/quoted.manip/quoted.pass.cpp
+++ b/test/std/input.output/iostream.format/quoted.manip/quoted.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03, c++11
+
 // <iomanip>
 
 // quoted
@@ -16,10 +17,6 @@
 #include <string>
 #include <cassert>
 
-#include "test_macros.h"
-
-#if TEST_STD_VER > 11
-
 template <class CharT, class Traits>
 bool is_skipws ( const std::basic_istream<CharT, Traits>& is ) {
     return ( is.flags() & std::ios_base::skipws ) != 0;
@@ -124,7 +121,7 @@ void test_padding () {
 }
 
 
-int main()
+int main(int, char**)
 {
     both_ways ( "" );   // This is a compilation check
 
@@ -174,8 +171,6 @@ int main()
     assert ( unquote (  "" ) ==  "" ); // nothing there
     assert ( unquote ( L"" ) == L"" ); // nothing there
     test_padding ();
-    }
 
-#else
-int main() {}
-#endif
+    return 0;
+}
diff --git a/test/std/input.output/iostream.format/quoted.manip/quoted_char.fail.cpp b/test/std/input.output/iostream.format/quoted.manip/quoted_char.fail.cpp
index 5a8369c2c..4b343013e 100644
--- a/test/std/input.output/iostream.format/quoted.manip/quoted_char.fail.cpp
+++ b/test/std/input.output/iostream.format/quoted.manip/quoted_char.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ void round_trip ( const char *p ) {
 
 
 
-int main()
+int main(int, char**)
 {
     round_trip ( "Hi Mom" );
 }
diff --git a/test/std/input.output/iostream.format/quoted.manip/quoted_traits.fail.cpp b/test/std/input.output/iostream.format/quoted.manip/quoted_traits.fail.cpp
index 9c0d3366c..b19eea376 100644
--- a/test/std/input.output/iostream.format/quoted.manip/quoted_traits.fail.cpp
+++ b/test/std/input.output/iostream.format/quoted.manip/quoted_traits.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void round_trip ( const char *p ) {
 
 
 
-int main()
+int main(int, char**)
 {
     round_trip ( "Hi Mom" );
 }
diff --git a/test/std/input.output/iostream.format/std.manip/resetiosflags.pass.cpp b/test/std/input.output/iostream.format/std.manip/resetiosflags.pass.cpp
index b0b3c31f7..637aa4ee3 100644
--- a/test/std/input.output/iostream.format/std.manip/resetiosflags.pass.cpp
+++ b/test/std/input.output/iostream.format/std.manip/resetiosflags.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -53,4 +52,6 @@ int main()
         os << std::resetiosflags(std::ios_base::skipws);
         assert(!(os.flags() & std::ios_base::skipws));
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/std.manip/setbase.pass.cpp b/test/std/input.output/iostream.format/std.manip/setbase.pass.cpp
index 0a2fb36ec..580ae4d24 100644
--- a/test/std/input.output/iostream.format/std.manip/setbase.pass.cpp
+++ b/test/std/input.output/iostream.format/std.manip/setbase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -73,4 +72,6 @@ int main()
         os << std::setbase(15);
         assert((os.flags() & std::ios_base::basefield) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/std.manip/setfill.pass.cpp b/test/std/input.output/iostream.format/std.manip/setfill.pass.cpp
index e8600972d..4398ff613 100644
--- a/test/std/input.output/iostream.format/std.manip/setfill.pass.cpp
+++ b/test/std/input.output/iostream.format/std.manip/setfill.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -36,4 +35,6 @@ int main()
         os << std::setfill(L'*');
         assert(os.fill() == L'*');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/std.manip/setiosflags.pass.cpp b/test/std/input.output/iostream.format/std.manip/setiosflags.pass.cpp
index 11532711a..ccf605ad7 100644
--- a/test/std/input.output/iostream.format/std.manip/setiosflags.pass.cpp
+++ b/test/std/input.output/iostream.format/std.manip/setiosflags.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -53,4 +52,6 @@ int main()
         os << std::setiosflags(std::ios_base::oct);
         assert(os.flags() & std::ios_base::oct);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/std.manip/setprecision.pass.cpp b/test/std/input.output/iostream.format/std.manip/setprecision.pass.cpp
index e04677fa3..e570faf7c 100644
--- a/test/std/input.output/iostream.format/std.manip/setprecision.pass.cpp
+++ b/test/std/input.output/iostream.format/std.manip/setprecision.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -49,4 +48,6 @@ int main()
         os << std::setprecision(10);
         assert(os.precision() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.format/std.manip/setw.pass.cpp b/test/std/input.output/iostream.format/std.manip/setw.pass.cpp
index 3242bcc94..44aa41e57 100644
--- a/test/std/input.output/iostream.format/std.manip/setw.pass.cpp
+++ b/test/std/input.output/iostream.format/std.manip/setw.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct testbuf
     testbuf() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb;
@@ -49,4 +48,6 @@ int main()
         os << std::setw(10);
         assert(os.width() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.forward/iosfwd.pass.cpp b/test/std/input.output/iostream.forward/iosfwd.pass.cpp
index 53d12ecfc..5c60dcca2 100644
--- a/test/std/input.output/iostream.forward/iosfwd.pass.cpp
+++ b/test/std/input.output/iostream.forward/iosfwd.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@ template <class Ptr> void test()
     ((void)p); // Prevent unused warning
 }
 
-int main()
+int main(int, char**)
 {
     test<std::char_traits<char>*          >();
     test<std::char_traits<wchar_t>*       >();
@@ -120,4 +119,6 @@ int main()
     test<std::fpos<std::mbstate_t>*>();
     test<std::streampos*           >();
     test<std::wstreampos*          >();
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.pass.cpp b/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.pass.cpp
index cdf53f862..ef3cbf676 100644
--- a/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.pass.cpp
+++ b/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <iostream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::cerr << "Hello World!\n";
@@ -26,4 +25,6 @@ int main()
 #endif
     assert(std::cerr.flags() & std::ios_base::unitbuf);
 #endif  // 0
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/narrow.stream.objects/cin.pass.cpp b/test/std/input.output/iostream.objects/narrow.stream.objects/cin.pass.cpp
index 1ce04ffb1..d28255043 100644
--- a/test/std/input.output/iostream.objects/narrow.stream.objects/cin.pass.cpp
+++ b/test/std/input.output/iostream.objects/narrow.stream.objects/cin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <iostream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::cout << "Hello World!\n";
@@ -31,4 +30,6 @@ int main()
     assert(std::cin.tie() == &std::cout);
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/narrow.stream.objects/clog.pass.cpp b/test/std/input.output/iostream.objects/narrow.stream.objects/clog.pass.cpp
index 3812b203a..97e67fddf 100644
--- a/test/std/input.output/iostream.objects/narrow.stream.objects/clog.pass.cpp
+++ b/test/std/input.output/iostream.objects/narrow.stream.objects/clog.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,11 +12,13 @@
 
 #include <iostream>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::clog << "Hello World!\n";
 #else
     (void)std::clog;
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/narrow.stream.objects/cout.pass.cpp b/test/std/input.output/iostream.objects/narrow.stream.objects/cout.pass.cpp
index e5887e162..44ae08577 100644
--- a/test/std/input.output/iostream.objects/narrow.stream.objects/cout.pass.cpp
+++ b/test/std/input.output/iostream.objects/narrow.stream.objects/cout.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <iostream>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::cout << "Hello World!\n";
@@ -26,4 +25,6 @@ int main()
 #else  // 0
     (void)std::cout;
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.pass.cpp b/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.pass.cpp
index b05078167..0af3f5ee7 100644
--- a/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.pass.cpp
+++ b/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <iostream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::wcerr << L"Hello World!\n";
@@ -26,4 +25,6 @@ int main()
 #endif
     assert(std::wcerr.flags() & std::ios_base::unitbuf);
 #endif  // 0
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/wide.stream.objects/wcin.pass.cpp b/test/std/input.output/iostream.objects/wide.stream.objects/wcin.pass.cpp
index 6abd6afa8..68c152860 100644
--- a/test/std/input.output/iostream.objects/wide.stream.objects/wcin.pass.cpp
+++ b/test/std/input.output/iostream.objects/wide.stream.objects/wcin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <iostream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::wcout << L"Hello World!\n";
@@ -31,4 +30,6 @@ int main()
     assert(std::wcin.tie() == &std::wcout);
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/wide.stream.objects/wclog.pass.cpp b/test/std/input.output/iostream.objects/wide.stream.objects/wclog.pass.cpp
index 61ff5fb50..ad7e35b51 100644
--- a/test/std/input.output/iostream.objects/wide.stream.objects/wclog.pass.cpp
+++ b/test/std/input.output/iostream.objects/wide.stream.objects/wclog.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,11 +12,13 @@
 
 #include <iostream>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::wclog << L"Hello World!\n";
 #else
     (void)std::wclog;
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostream.objects/wide.stream.objects/wcout.pass.cpp b/test/std/input.output/iostream.objects/wide.stream.objects/wcout.pass.cpp
index 6543e0aa5..5703c6163 100644
--- a/test/std/input.output/iostream.objects/wide.stream.objects/wcout.pass.cpp
+++ b/test/std/input.output/iostream.objects/wide.stream.objects/wcout.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 
 #include <iostream>
 
-int main()
+int main(int, char**)
 {
 #if 0
     std::wcout << L"Hello World!\n";
 #else
     (void)std::wcout;
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.members/state.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.members/state.pass.cpp
index 1da6d4406..3938d7980 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.members/state.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.members/state.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::fpos<int> f;
     f.state(3);
     assert(f.state() == 3);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.operations/addition.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.operations/addition.pass.cpp
index a602e3e94..30bdabc36 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.operations/addition.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.operations/addition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::fpos<std::mbstate_t> P;
     P p(5);
@@ -25,4 +24,6 @@ int main()
     assert(q == P(11));
     p += o;
     assert(p == q);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.operations/ctor_int.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.operations/ctor_int.pass.cpp
index 1b939d86e..e27c90687 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.operations/ctor_int.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.operations/ctor_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::fpos<std::mbstate_t> P;
     P p(5);
     assert(p == P(5));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.operations/difference.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.operations/difference.pass.cpp
index 47ce6870a..114e382a7 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.operations/difference.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.operations/difference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::fpos<std::mbstate_t> P;
     P p(11);
     P q(6);
     std::streamoff o = p - q;
     assert(o == 5);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.operations/eq_int.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.operations/eq_int.pass.cpp
index 76f8fa12a..1b1a5f33d 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.operations/eq_int.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.operations/eq_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::fpos<std::mbstate_t> P;
     P p(5);
     P q(6);
     assert(p == p);
     assert(p != q);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.operations/offset.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.operations/offset.pass.cpp
index 9c6ebd9f7..a8e763f72 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.operations/offset.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.operations/offset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::fpos<std::mbstate_t> P;
     P p(std::streamoff(7));
     std::streamoff offset(p);
     assert(offset == 7);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.operations/streamsize.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.operations/streamsize.pass.cpp
index eb738b492..9d9cd7902 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.operations/streamsize.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.operations/streamsize.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,11 +13,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::streamoff o(5);
     std::streamsize sz(o);
     assert(sz == 5);
     std::streamoff o2(sz);
     assert(o == o2);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/fpos.operations/subtraction.pass.cpp b/test/std/input.output/iostreams.base/fpos/fpos.operations/subtraction.pass.cpp
index f9e6513e4..b38378b7e 100644
--- a/test/std/input.output/iostreams.base/fpos/fpos.operations/subtraction.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/fpos.operations/subtraction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::fpos<std::mbstate_t> P;
     P p(11);
@@ -25,4 +24,6 @@ int main()
     assert(q == P(5));
     p -= o;
     assert(p == q);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/fpos/nothing_to_do.pass.cpp b/test/std/input.output/iostreams.base/fpos/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.base/fpos/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostreams.base/fpos/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags.pass.cpp
index 958fcb53d..da147bd82 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     const test t;
     assert(t.flags() == (test::skipws | test::dec));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags_fmtflags.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags_fmtflags.pass.cpp
index 36b579498..ed39a5424 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags_fmtflags.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/flags_fmtflags.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.flags() == (test::skipws | test::dec));
     test::fmtflags f = t.flags(test::hex | test::right);
     assert(f == (test::skipws | test::dec));
     assert(t.flags() == (test::hex | test::right));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision.pass.cpp
index 701e3de36..f6387c828 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     const test t;
     assert(t.precision() == 6);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision_streamsize.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision_streamsize.pass.cpp
index e0d6484c8..475ddc47f 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision_streamsize.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/precision_streamsize.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.precision() == 6);
     std::streamsize p = t.precision(10);
     assert(p == 6);
     assert(t.precision() == 10);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags.pass.cpp
index d9ec47b79..d8ca9cc82 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.flags() == (test::skipws | test::dec));
     test::fmtflags f = t.setf(test::hex | test::right);
     assert(f == (test::skipws | test::dec));
     assert(t.flags() == (test::skipws | test::dec | test::hex | test::right));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags_mask.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags_mask.pass.cpp
index b20137702..6793ced7f 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags_mask.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/setf_fmtflags_mask.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.flags() == (test::skipws | test::dec));
     test::fmtflags f = t.setf(test::hex | test::right, test::dec | test::right);
     assert(f == (test::skipws | test::dec));
     assert(t.flags() == (test::skipws | test::right));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/unsetf_mask.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/unsetf_mask.pass.cpp
index 163fc54a1..f20acff13 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/unsetf_mask.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/unsetf_mask.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,10 +25,12 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.flags() == (test::skipws | test::dec));
     t.unsetf(test::dec | test::right);
     assert(t.flags() == test::skipws);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width.pass.cpp
index 287c89d29..fc2601a45 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     const test t;
     assert(t.width() == 0);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width_streamsize.pass.cpp b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width_streamsize.pass.cpp
index 6e532dedd..3b389e5fd 100644
--- a/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width_streamsize.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/fmtflags.state/width_streamsize.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.width() == 0);
     std::streamsize w = t.width(4);
     assert(w == 0);
     assert(t.width() == 4);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp
index f4d541e2f..316d23a52 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ void f1(std::ios_base::event ev, std::ios_base& stream, int index)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test t;
     std::ios_base& b = t;
@@ -53,4 +52,6 @@ int main()
     b.register_callback(f1, 4);
     std::locale l = b.imbue(std::locale(LOCALE_en_US_UTF_8));
     assert(f1_called == 3);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.cons/dtor.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.cons/dtor.pass.cpp
index e6f334808..7c78ea566 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.cons/dtor.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.cons/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ void f3(std::ios_base::event ev, std::ios_base& stream, int index)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -83,4 +82,6 @@ int main()
     assert(f1_called);
     assert(f2_called);
     assert(f3_called);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.locales/getloc.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.locales/getloc.pass.cpp
index 8f265bc69..06b8d83c7 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.locales/getloc.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.locales/getloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     const test t;
     assert(t.getloc().name() == std::string("C"));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp
index 1cad020b0..ad8898a17 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ void f3(std::ios_base::event ev, std::ios_base& stream, int index)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test t;
     std::ios_base& b = t;
@@ -88,4 +87,6 @@ int main()
     assert(f1_called);
     assert(f2_called);
     assert(f3_called);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.storage/iword.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.storage/iword.pass.cpp
index 59f0bd478..84eb18370 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.storage/iword.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.storage/iword.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     std::ios_base& b = t;
@@ -42,4 +41,6 @@ int main()
         for (int j = 0; j <= i; ++j)
             assert(b.iword(j) == j);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.storage/pword.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.storage/pword.pass.cpp
index 45115823b..c4594615d 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.storage/pword.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.storage/pword.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     std::ios_base& b = t;
@@ -43,4 +42,6 @@ int main()
         for (std::intptr_t j = 0; j <= i; ++j)
             assert(b.pword(j) == (void*)j);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.storage/xalloc.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.storage/xalloc.pass.cpp
index eb737b1a7..2fcaddd6d 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.storage/xalloc.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.storage/xalloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::ios_base::xalloc() == 0);
     assert(std::ios_base::xalloc() == 1);
     assert(std::ios_base::xalloc() == 2);
     assert(std::ios_base::xalloc() == 3);
     assert(std::ios_base::xalloc() == 4);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
index 5dc72b1ed..cd219971e 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert( std::ios_base::sync_with_stdio(false));
     assert(!std::ios_base::sync_with_stdio(false));
@@ -24,4 +23,6 @@ int main()
     assert( std::ios_base::sync_with_stdio(false));
     assert(!std::ios_base::sync_with_stdio());
     assert( std::ios_base::sync_with_stdio());
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/tested_elsewhere.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/tested_elsewhere.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_Init/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_char_pointer_error_code.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_char_pointer_error_code.pass.cpp
index 44c55118d..382aeda4f 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_char_pointer_error_code.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_char_pointer_error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::string what_arg("io test message");
@@ -38,4 +37,6 @@ int main()
         assert(what_message.find(std::iostream_category().message(static_cast<int>
             (std::io_errc::stream))) != std::string::npos);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_string_error_code.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_string_error_code.pass.cpp
index 5711b55c7..610e6ad15 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_string_error_code.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_failure/ctor_string_error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <system_error>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     // LWG2462 std::ios_base::failure is overspecified
     static_assert((std::is_base_of<std::system_error, std::ios_base::failure>::value), "");
@@ -41,4 +40,6 @@ int main()
         assert(what_message.find(std::iostream_category().message(static_cast<int>
             (std::io_errc::stream))) != std::string::npos);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_fmtflags/fmtflags.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_fmtflags/fmtflags.pass.cpp
index 9f374598f..2eed477b0 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_fmtflags/fmtflags.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_fmtflags/fmtflags.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::ios_base::boolalpha);
     assert(std::ios_base::dec);
@@ -78,4 +77,6 @@ int main()
                                       | std::ios_base::hex));
     assert(std::ios_base::floatfield == (std::ios_base::scientific
                                        | std::ios_base::fixed));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_iostate/iostate.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_iostate/iostate.pass.cpp
index 55c02f38c..7e982f25f 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_iostate/iostate.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_iostate/iostate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::ios_base::badbit);
     assert(std::ios_base::eofbit);
@@ -33,4 +32,6 @@ int main()
     );
 
     assert(std::ios_base::goodbit == 0);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_openmode/openmode.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_openmode/openmode.pass.cpp
index 238593feb..ab21f96b7 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_openmode/openmode.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_openmode/openmode.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::ios_base::app);
     assert(std::ios_base::ate);
@@ -39,4 +38,6 @@ int main()
         & std::ios_base::out
         & std::ios_base::trunc) == 0
     );
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_seekdir/seekdir.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_seekdir/seekdir.pass.cpp
index 005fb61cc..dfa955c7f 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/ios_seekdir/seekdir.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/ios_seekdir/seekdir.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::ios_base::beg != std::ios_base::cur);
     assert(std::ios_base::beg != std::ios_base::end);
     assert(std::ios_base::cur != std::ios_base::end);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.types/nothing_to_do.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.types/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.types/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.types/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios.base/nothing_to_do.pass.cpp b/test/std/input.output/iostreams.base/ios.base/nothing_to_do.pass.cpp
index 760bfcb26..c4eff25bc 100644
--- a/test/std/input.output/iostreams.base/ios.base/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/nothing_to_do.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,6 +10,8 @@
 
 #include <ios>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.cons/ctor_streambuf.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.cons/ctor_streambuf.pass.cpp
index d86059ea6..01c0d4679 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.cons/ctor_streambuf.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.cons/ctor_streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <streambuf>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::streambuf* sb = 0;
@@ -45,4 +44,6 @@ int main()
         assert(ios.fill() == ' ');
         assert(ios.getloc() == std::locale());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/copyfmt.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/copyfmt.pass.cpp
index 77b433653..949c87e0b 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/copyfmt.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/copyfmt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -111,7 +110,7 @@ void g3(std::ios_base::event ev, std::ios_base& stream, int index)
     }
 }
 
-int main()
+int main(int, char**)
 {
     testbuf sb1;
     std::ios ios1(&sb1);
@@ -191,4 +190,6 @@ int main()
     assert(ios1.tie() == (std::ostream*)2);
     assert(ios1.fill() == '2');
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/fill.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/fill.pass.cpp
index f5c5aa22b..f45c6c8b2 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/fill.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/fill.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::ios ios(0);
     assert(ios.fill() == ' ');
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/fill_char_type.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/fill_char_type.pass.cpp
index 10dccca85..1c42a03fb 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/fill_char_type.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/fill_char_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     assert(ios.fill() == ' ');
     char c = ios.fill('*');
     assert(c == ' ');
     assert(ios.fill() == '*');
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp
index 1c1c8be95..ed0df788d 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,7 +68,7 @@ void f3(std::ios_base::event ev, std::ios_base& stream, int index)
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -100,4 +99,6 @@ int main()
         assert(f2_called);
         assert(f3_called);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/move.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/move.pass.cpp
index 0b068e0d4..5f99f3db0 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/move.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -78,7 +77,7 @@ void g3(std::ios_base::event ev, std::ios_base&, int index)
     }
 }
 
-int main()
+int main(int, char**)
 {
     testios ios1;
     testbuf sb2;
@@ -137,4 +136,6 @@ int main()
 
     assert(ios2.rdbuf() == &sb2);
     assert(ios2.tie() == 0);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/narrow.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/narrow.pass.cpp
index 3cdb434c4..afab4ec5d 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/narrow.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/narrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::wios ios(0);
     assert(ios.narrow(L'c', '*') == 'c');
     assert(ios.narrow(L'\u203C', '*') == '*');
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf.pass.cpp
index 7be92e72b..f104cada6 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <streambuf>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::ios ios(0);
@@ -28,4 +27,6 @@ int main()
         const std::ios ios(sb);
         assert(ios.rdbuf() == sb);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf_streambuf.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf_streambuf.pass.cpp
index cc0b3f3f1..5c4e24a82 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf_streambuf.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/rdbuf_streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <streambuf>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     assert(ios.rdbuf() == 0);
@@ -31,4 +30,6 @@ int main()
     assert(sb2 == (std::streambuf*)1);
     assert(ios.rdbuf() == 0);
     assert(ios.bad());
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/set_rdbuf.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/set_rdbuf.pass.cpp
index 8852c9b55..04b1b9ff6 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/set_rdbuf.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/set_rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct testios
     void set_rdbuf(std::streambuf* x) {std::ios::set_rdbuf(x);}
 };
 
-int main()
+int main(int, char**)
 {
     testbuf sb1;
     testbuf sb2;
@@ -61,4 +60,6 @@ int main()
 #endif
     ios.set_rdbuf(0);
     assert(ios.rdbuf() == 0);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/swap.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/swap.pass.cpp
index 2887ca100..40e95bae7 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/swap.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ void g3(std::ios_base::event, std::ios_base&, int index)
     g3_called = true;
 }
 
-int main()
+int main(int, char**)
 {
     testbuf sb1;
     testios ios1(&sb1);
@@ -165,4 +164,6 @@ int main()
     ios2.imbue(std::locale("C"));
     assert(f1_called);
     assert(f2_called);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/tie.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/tie.pass.cpp
index 71eb23846..c0d7ac173 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/tie.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/tie.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::basic_ios<char> ios(0);
     assert(ios.tie() == 0);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/tie_ostream.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/tie_ostream.pass.cpp
index acccbea2a..4ce5966ad 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/tie_ostream.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/tie_ostream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ostream* os = (std::ostream*)1;
     std::ostream* r = ios.tie(os);
     assert(r == 0);
     assert(ios.tie() == os);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/widen.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/widen.pass.cpp
index 68fdf6859..0ae563718 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/widen.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/widen.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::ios ios(0);
     assert(ios.widen('c') == 'c');
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/bad.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/bad.pass.cpp
index 1005df6ef..2308cfa92 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/bad.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/bad.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -38,4 +37,6 @@ int main()
         ios.setstate(std::ios::badbit);
         assert(ios.bad());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/bool.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/bool.pass.cpp
index 4e3faa27c..24fcbff39 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/bool.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     assert(static_cast<bool>(ios) == !ios.fail());
@@ -31,4 +30,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((!std::is_convertible<std::ios, bool>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/clear.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/clear.pass.cpp
index 3efe910b3..6fc38fde9 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/clear.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -67,4 +66,6 @@ int main()
         ios.clear(std::ios::eofbit);
         assert(ios.rdstate() == std::ios::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/eof.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/eof.pass.cpp
index 64d5a3018..bf1d0246d 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/eof.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -34,4 +33,6 @@ int main()
         ios.setstate(std::ios::eofbit);
         assert(ios.eof());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions.pass.cpp
index d5158a184..4632e0043 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         const std::ios ios(0);
@@ -30,4 +29,6 @@ int main()
         const std::ios ios(&sb);
         assert(ios.exceptions() == std::ios::goodbit);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions_iostate.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions_iostate.pass.cpp
index d99269be7..b8b6577b2 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions_iostate.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/exceptions_iostate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -49,4 +48,6 @@ int main()
         ios.exceptions(std::ios::badbit);
         assert(ios.exceptions() == std::ios::badbit);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/fail.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/fail.pass.cpp
index fa9f765bf..3ae215e45 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/fail.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/fail.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -38,4 +37,6 @@ int main()
         ios.setstate(std::ios::failbit);
         assert(ios.fail());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/good.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/good.pass.cpp
index 03f89506d..19c05edce 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/good.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/good.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -32,4 +31,6 @@ int main()
         ios.setstate(std::ios::eofbit);
         assert(!ios.good());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/not.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/not.pass.cpp
index ef534f6d0..20ddb35dc 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/not.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     assert(!ios == ios.fail());
     ios.setstate(std::ios::failbit);
     assert(!ios == ios.fail());
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/rdstate.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/rdstate.pass.cpp
index d09e2a62e..37886ac83 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/rdstate.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/rdstate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     assert(ios.rdstate() == std::ios::badbit);
     ios.setstate(std::ios::failbit);
     assert(ios.rdstate() == (std::ios::failbit | std::ios::badbit));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/iostate.flags/setstate.pass.cpp b/test/std/input.output/iostreams.base/ios/iostate.flags/setstate.pass.cpp
index 6d2fe0691..ea954bee0 100644
--- a/test/std/input.output/iostreams.base/ios/iostate.flags/setstate.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/iostate.flags/setstate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     {
         std::ios ios(0);
@@ -66,4 +65,6 @@ int main()
         ios.setstate(std::ios::failbit);
         assert(ios.rdstate() == (std::ios::eofbit | std::ios::failbit));
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/ios/types.pass.cpp b/test/std/input.output/iostreams.base/ios/types.pass.cpp
index 22e33f61f..b4a4d7c57 100644
--- a/test/std/input.output/iostreams.base/ios/types.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <ios>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::ios_base, std::basic_ios<char> >::value), "");
     static_assert((std::is_same<std::basic_ios<char>::char_type, char>::value), "");
@@ -30,4 +29,6 @@ int main()
     static_assert((std::is_same<std::basic_ios<char>::int_type, std::char_traits<char>::int_type>::value), "");
     static_assert((std::is_same<std::basic_ios<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_ios<char>::off_type, std::char_traits<char>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/is_error_code_enum_io_errc.pass.cpp b/test/std/input.output/iostreams.base/is_error_code_enum_io_errc.pass.cpp
index 5bba8bd3a..76eb83148 100644
--- a/test/std/input.output/iostreams.base/is_error_code_enum_io_errc.pass.cpp
+++ b/test/std/input.output/iostreams.base/is_error_code_enum_io_errc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,10 +15,12 @@
 #include <ios>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_error_code_enum  <std::io_errc>::value, "");
 #if TEST_STD_VER > 14
     static_assert(std::is_error_code_enum_v<std::io_errc>, "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/internal.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/internal.pass.cpp
index 461c77742..fba2e71ca 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/internal.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/internal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::internal(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::internal);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/left.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/left.pass.cpp
index aa2ca6f27..f89d6b9e7 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/left.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/left.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::left(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::left);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/right.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/right.pass.cpp
index 08056e8f3..399d3ba51 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/right.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/adjustfield.manip/right.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::right(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::right);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/dec.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/dec.pass.cpp
index cbe03bceb..98740cdc0 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/dec.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/dec.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::dec(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::dec);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/hex.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/hex.pass.cpp
index 281a59cda..39addcdcf 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/hex.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/hex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::hex(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::hex);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/oct.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/oct.pass.cpp
index 5ebfea86f..92b2d4ee7 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/oct.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/basefield.manip/oct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::oct(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::oct);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/iostream_category.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/iostream_category.pass.cpp
index a93c7b4c2..e017c632a 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/iostream_category.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/iostream_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 #include <cassert>
 #include <string>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat1 = std::iostream_category();
     std::string m1 = e_cat1.name();
     assert(m1 == "iostream");
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_code.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_code.pass.cpp
index f764fa6fd..060b6284c 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_code.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,11 +13,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec = make_error_code(std::io_errc::stream);
         assert(ec.value() == static_cast<int>(std::io_errc::stream));
         assert(ec.category() == std::iostream_category());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_condition.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_condition.pass.cpp
index 30931bae0..3970708bf 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_condition.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/error.reporting/make_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,11 +13,13 @@
 #include <ios>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_condition ec1 = std::make_error_condition(std::io_errc::stream);
         assert(ec1.value() == static_cast<int>(std::io_errc::stream));
         assert(ec1.category() == std::iostream_category());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/defaultfloat.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/defaultfloat.pass.cpp
index f202bc4c8..bb8c424a1 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/defaultfloat.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/defaultfloat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::fixed));
     assert(!(ios.flags() & std::ios::scientific));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/fixed.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/fixed.pass.cpp
index 55bf2648f..94cbf1a53 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/fixed.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/fixed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::fixed(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::fixed);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/hexfloat.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/hexfloat.pass.cpp
index 2920cca83..c24d7f999 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/hexfloat.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/hexfloat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     assert(&r == &ios);
     assert(ios.flags() & std::ios::fixed);
     assert(ios.flags() & std::ios::scientific);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/scientific.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/scientific.pass.cpp
index 53cfd8171..c8a481944 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/scientific.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/floatfield.manip/scientific.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::scientific(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::scientific);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/boolalpha.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/boolalpha.pass.cpp
index ca8cd93f0..176267dd6 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/boolalpha.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/boolalpha.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::boolalpha(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::boolalpha);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noboolalpha.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noboolalpha.pass.cpp
index ebc0aab67..27d61cee7 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noboolalpha.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noboolalpha.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     std::ios_base& r = std::noboolalpha(ios);
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::boolalpha));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowbase.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowbase.pass.cpp
index 91608f0f5..b730afa88 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowbase.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowbase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     std::ios_base& r = std::noshowbase(ios);
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::showbase));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpoint.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpoint.pass.cpp
index 6e26416c5..0d9f33ea5 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpoint.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpoint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     std::ios_base& r = std::noshowpoint(ios);
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::showpoint));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpos.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpos.pass.cpp
index 5e6911c22..fa54cd647 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpos.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noshowpos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     std::ios_base& r = std::noshowpos(ios);
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::showpos));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noskipws.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noskipws.pass.cpp
index e78f5f884..9ee5ea8e6 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noskipws.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/noskipws.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     std::ios_base& r = std::noskipws(ios);
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::skipws));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nounitbuf.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nounitbuf.pass.cpp
index 5708038e5..ce06e12bd 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nounitbuf.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nounitbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     std::ios_base& r = std::nounitbuf(ios);
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::unitbuf));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nouppercase.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nouppercase.pass.cpp
index 76fac604b..8e0554620 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nouppercase.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nouppercase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
@@ -27,4 +26,6 @@ int main()
     std::ios_base& r = std::nouppercase(ios);
     assert(&r == &ios);
     assert(!(ios.flags() & std::ios::uppercase));
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showbase.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showbase.pass.cpp
index ddf3a8550..7f1338c5d 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showbase.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showbase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::showbase(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::showbase);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpoint.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpoint.pass.cpp
index 79ae3b6e2..03cf312d0 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpoint.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpoint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::showpoint(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::showpoint);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpos.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpos.pass.cpp
index 226542614..2fb0d6511 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpos.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/showpos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::showpos(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::showpos);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/skipws.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/skipws.pass.cpp
index 4ea3e448f..2c64cb8df 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/skipws.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/skipws.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::skipws(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::skipws);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/unitbuf.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/unitbuf.pass.cpp
index 99a33c71c..6acedc6a5 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/unitbuf.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/unitbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::unitbuf(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::unitbuf);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/uppercase.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/uppercase.pass.cpp
index 1a19e2aa6..e97763fff 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/uppercase.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/uppercase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 
 struct testbuf : public std::streambuf {};
 
-int main()
+int main(int, char**)
 {
     testbuf sb;
     std::ios ios(&sb);
     std::ios_base& r = std::uppercase(ios);
     assert(&r == &ios);
     assert(ios.flags() & std::ios::uppercase);
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/std.ios.manip/nothing_to_do.pass.cpp b/test/std/input.output/iostreams.base/std.ios.manip/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.base/std.ios.manip/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostreams.base/std.ios.manip/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/stream.types/streamoff.pass.cpp b/test/std/input.output/iostreams.base/stream.types/streamoff.pass.cpp
index 0e9f1278e..20b953d55 100644
--- a/test/std/input.output/iostreams.base/stream.types/streamoff.pass.cpp
+++ b/test/std/input.output/iostreams.base/stream.types/streamoff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,8 +13,10 @@
 #include <ios>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_integral<std::streamoff>::value, "");
     static_assert(std::is_signed<std::streamoff>::value, "");
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.base/stream.types/streamsize.pass.cpp b/test/std/input.output/iostreams.base/stream.types/streamsize.pass.cpp
index 438c51138..50fa21e8d 100644
--- a/test/std/input.output/iostreams.base/stream.types/streamsize.pass.cpp
+++ b/test/std/input.output/iostreams.base/stream.types/streamsize.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,8 +13,10 @@
 #include <ios>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_integral<std::streamsize>::value, "");
     static_assert(std::is_signed<std::streamsize>::value, "");
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.requirements/iostream.limits.imbue/tested_elsewhere.pass.cpp b/test/std/input.output/iostreams.requirements/iostream.limits.imbue/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.requirements/iostream.limits.imbue/tested_elsewhere.pass.cpp
+++ b/test/std/input.output/iostreams.requirements/iostream.limits.imbue/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.requirements/iostreams.limits.pos/nothing_to_do.pass.cpp b/test/std/input.output/iostreams.requirements/iostreams.limits.pos/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.requirements/iostreams.limits.pos/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostreams.requirements/iostreams.limits.pos/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.requirements/iostreams.threadsafety/nothing_to_do.pass.cpp b/test/std/input.output/iostreams.requirements/iostreams.threadsafety/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.requirements/iostreams.threadsafety/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostreams.requirements/iostreams.threadsafety/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/iostreams.requirements/nothing_to_do.pass.cpp b/test/std/input.output/iostreams.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/iostreams.requirements/nothing_to_do.pass.cpp
+++ b/test/std/input.output/iostreams.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/nothing_to_do.pass.cpp b/test/std/input.output/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/nothing_to_do.pass.cpp
+++ b/test/std/input.output/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf.reqts/tested_elsewhere.pass.cpp b/test/std/input.output/stream.buffers/streambuf.reqts/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/stream.buffers/streambuf.reqts/tested_elsewhere.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf.reqts/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.fail.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.fail.cpp
index 03f6d7d0b..285485087 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.fail.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 std::streambuf &get();
 
-int main()
+int main(int, char**)
 {
     std::streambuf sb = get(); // expected-error {{calling a protected constructor}}
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp
index 7ca8f37fa..405c72995 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -83,4 +82,6 @@ int main()
         test<wchar_t> t;
         test<wchar_t> t2 = t;
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.fail.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.fail.cpp
index 7f57f3cf9..ec7650ae0 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.fail.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 
 #include <streambuf>
 
-int main()
+int main(int, char**)
 {
     std::basic_streambuf<char> sb;
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp
index 0572a9bbe..15475d3d6 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -55,4 +54,6 @@ int main()
         test<wchar_t> t;
         assert(t.getloc().name() == LOCALE_en_US_UTF_8);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/nothing_to_do.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/nothing_to_do.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekoff.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekoff.pass.cpp
index 2c77f25c2..b49fc2094 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekoff.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekoff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,11 +24,13 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
         assert(t.pubseekoff(0, std::ios_base::beg) == -1);
         assert(t.pubseekoff(0, std::ios_base::beg, std::ios_base::app) == -1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekpos.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekpos.pass.cpp
index 0b9ddff41..1095c9148 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekpos.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubseekpos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,10 +24,12 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
         assert(t.pubseekpos(0, std::ios_base::app) == -1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsetbuf.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsetbuf.pass.cpp
index 8cf62771e..c0efb1710 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsetbuf.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsetbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,10 +23,12 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
         assert(t.pubsetbuf(0, 0) == &t);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsync.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsync.pass.cpp
index cc1679071..8d7528ee2 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsync.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.buffer/pubsync.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,10 +23,12 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
         assert(t.pubsync() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.locales/locales.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.locales/locales.pass.cpp
index 95dd2db75..835944fcf 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.locales/locales.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.locales/locales.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -49,4 +48,6 @@ int main()
                LOCALE_en_US_UTF_8);
         assert(t.getloc().name() == LOCALE_fr_FR_UTF_8);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/in_avail.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/in_avail.pass.cpp
index 200150639..6d11a8e89 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/in_avail.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/in_avail.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -49,4 +48,6 @@ int main()
         t.setg(in, in+2, in+5);
         assert(t.in_avail() == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sbumpc.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sbumpc.pass.cpp
index ac6d0cc93..4ac2d6fe5 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sbumpc.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sbumpc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -53,4 +52,6 @@ int main()
         assert(t.sbumpc() == 'B');
         assert(uflow_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetc.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetc.pass.cpp
index c68930cfa..8baefb279 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetc.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -53,4 +52,6 @@ int main()
         assert(t.sgetc() == 'A');
         assert(underflow_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetn.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetn.pass.cpp
index 1935308de..9088ed846 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetn.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/sgetn.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,10 +31,12 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(xsgetn_called == 0);
     assert(t.sgetn(0, 0) == 10);
     assert(xsgetn_called == 1);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/snextc.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/snextc.pass.cpp
index 7f44245e2..54965bca2 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/snextc.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.get/snextc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -53,4 +52,6 @@ int main()
         assert(t.snextc() == 'C');
         assert(uflow_called == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sputbackc.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sputbackc.pass.cpp
index 2f4aad051..3b63ba3ce 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sputbackc.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sputbackc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -53,4 +52,6 @@ int main()
         assert(t.sputbackc('A') == 'a');
         assert(pbackfail_called == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sungetc.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sungetc.pass.cpp
index 36a19da85..07c1600b0 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sungetc.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.pback/sungetc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -53,4 +52,6 @@ int main()
         assert(t.sungetc() == 'a');
         assert(pbackfail_called == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputc.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputc.pass.cpp
index 5ea48c18d..989b61d4e 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputc.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -60,4 +59,6 @@ int main()
         assert(out[0] == 'A');
         assert(out[1] == 'B');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputn.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputn.pass.cpp
index 4ced690a2..01bd9d487 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputn.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.members/streambuf.pub.put/sputn.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,10 +31,12 @@ protected:
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(xsputn_called == 0);
     assert(t.sputn(0, 0) == 5);
     assert(xsputn_called == 1);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/nothing_to_do.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/nothing_to_do.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp
index fc1a18fe3..6109a6aa4 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -90,4 +89,6 @@ int main()
         test<wchar_t> t2;
         t2 = t;
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp
index 23867e63f..2809d6312 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -99,4 +98,6 @@ int main()
         test<wchar_t> t2;
         t2.swap(t);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/gbump.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/gbump.pass.cpp
index ce25a1919..161461dee 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/gbump.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/gbump.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -56,4 +55,6 @@ int main()
         t.setg(in, in+1, in+sizeof(in)/sizeof(in[0]));
         t.gbump(3);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/setg.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/setg.pass.cpp
index 68dcf6eab..b303465f0 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/setg.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.get.area/setg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -46,4 +45,6 @@ int main()
         wchar_t in[] = L"ABC";
         t.setg(in, in+1, in+sizeof(in)/sizeof(in[0]));
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump.pass.cpp
index 47ef93914..e151d3227 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -58,4 +57,6 @@ int main()
         t.pbump(3);
         t.pbump(1);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump2gig.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump2gig.pass.cpp
index 460e4c07e..eee48f3df 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump2gig.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/pbump2gig.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct SB : std::stringbuf
   const char* pubpptr() const { return pptr(); }
 };
 
-int main()
+int main(int, char**)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     try {
@@ -41,4 +40,6 @@ int main()
     catch (const std::length_error &) {} // maybe the string can't take 2GB
     catch (const std::bad_alloc    &) {} // maybe we don't have enough RAM
 #endif
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/setp.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/setp.pass.cpp
index fa4133a47..6ca36227b 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/setp.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.put.area/setp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test<char> t;
@@ -46,4 +45,6 @@ int main()
         wchar_t in[] = L"ABC";
         t.setp(in, in+sizeof(in)/sizeof(in[0]));
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/nothing_to_do.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/nothing_to_do.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.buffer/tested_elsewhere.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.buffer/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.buffer/tested_elsewhere.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.buffer/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/showmanyc.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/showmanyc.pass.cpp
index acaf1e846..5a238e884 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/showmanyc.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/showmanyc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     test<char> t;
     assert(t.in_avail() == 0);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/uflow.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/uflow.pass.cpp
index d25ae9b21..2f86c3b1a 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/uflow.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/uflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ struct test
 
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.sgetc() == -1);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/underflow.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/underflow.pass.cpp
index 1bdba0714..1d2ce7c5c 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/underflow.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/underflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,8 +22,10 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.sgetc() == -1);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/xsgetn.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/xsgetn.pass.cpp
index b1f154273..f5a95821b 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/xsgetn.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.get/xsgetn.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,6 +15,7 @@
 
 #include <streambuf>
 #include <cassert>
+#include <cstring>
 
 struct test
     : public std::basic_streambuf<char>
@@ -30,12 +30,14 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     char input[7] = "123456";
     t.setg(input, input, input+7);
     char output[sizeof(input)] = {0};
     assert(t.sgetn(output, 10) == 7);
-    assert(strcmp(input, output) == 0);
+    assert(std::strcmp(input, output) == 0);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.locales/nothing_to_do.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.locales/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.locales/nothing_to_do.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.locales/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.pback/pbackfail.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.pback/pbackfail.pass.cpp
index 3a10d8a70..217ff8c32 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.pback/pbackfail.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.pback/pbackfail.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.sputbackc('A') == -1);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/overflow.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/overflow.pass.cpp
index dcdd45f5f..e067088f5 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/overflow.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/overflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,8 +22,10 @@ struct test
     test() {}
 };
 
-int main()
+int main(int, char**)
 {
     test t;
     assert(t.sputc('A') == -1);
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/xsputn.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/xsputn.pass.cpp
index 93dc15401..1c30c8f28 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/xsputn.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/xsputn.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,6 +15,7 @@
 
 #include <streambuf>
 #include <cassert>
+#include <cstring>
 
 struct test
     : public std::basic_streambuf<char>
@@ -30,7 +30,7 @@ struct test
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         test t;
@@ -39,6 +39,8 @@ int main()
         char out[sizeof(in)] = {0};
         t.setp(out, out+sizeof(out));
         assert(t.sputn(in, sizeof(in)) == sizeof(in));
-        assert(strcmp(in, out) == 0);
+        assert(std::strcmp(in, out) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/stream.buffers/streambuf/types.pass.cpp b/test/std/input.output/stream.buffers/streambuf/types.pass.cpp
index 919caee36..434f8e3ec 100644
--- a/test/std/input.output/stream.buffers/streambuf/types.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <streambuf>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::streambuf::char_type, char>::value), "");
     static_assert((std::is_same<std::streambuf::traits_type, std::char_traits<char> >::value), "");
@@ -36,4 +35,6 @@ int main()
     static_assert((std::is_same<std::wstreambuf::int_type, std::char_traits<wchar_t>::int_type>::value), "");
     static_assert((std::is_same<std::wstreambuf::pos_type, std::char_traits<wchar_t>::pos_type>::value), "");
     static_assert((std::is_same<std::wstreambuf::off_type, std::char_traits<wchar_t>::off_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/istringstream.assign/member_swap.pass.cpp b/test/std/input.output/string.streams/istringstream/istringstream.assign/member_swap.pass.cpp
index fc5f2e7e9..d0a5863ed 100644
--- a/test/std/input.output/string.streams/istringstream/istringstream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/istringstream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream ss0(" 123 456");
@@ -53,4 +52,6 @@ int main()
         ss0 >> i;
         assert(i == 321);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp b/test/std/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp
index 2a428c5d9..567795943 100644
--- a/test/std/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream ss0(" 123 456");
@@ -83,4 +82,6 @@ int main()
         s1 >> s;
         assert(s == L"Dddddddddddddddddd");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/istringstream.assign/nonmember_swap.pass.cpp b/test/std/input.output/string.streams/istringstream/istringstream.assign/nonmember_swap.pass.cpp
index d72cef160..b8b00310d 100644
--- a/test/std/input.output/string.streams/istringstream/istringstream.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/istringstream.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream ss0(" 123 456");
@@ -56,4 +55,6 @@ int main()
         ss0 >> i;
         assert(i == 321);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/istringstream.cons/default.pass.cpp b/test/std/input.output/string.streams/istringstream/istringstream.cons/default.pass.cpp
index 5d44a50a3..414c22695 100644
--- a/test/std/input.output/string.streams/istringstream/istringstream.cons/default.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/istringstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream ss;
@@ -43,4 +42,6 @@ int main()
         assert(ss.good());
         assert(ss.str() == L"");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/istringstream.cons/move.pass.cpp b/test/std/input.output/string.streams/istringstream/istringstream.cons/move.pass.cpp
index 0a45b796b..27eb5a745 100644
--- a/test/std/input.output/string.streams/istringstream/istringstream.cons/move.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/istringstream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream ss0(" 123 456");
@@ -45,4 +44,6 @@ int main()
         ss >> i;
         assert(i == 456);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/istringstream.cons/string.pass.cpp b/test/std/input.output/string.streams/istringstream/istringstream.cons/string.pass.cpp
index 977923639..04733d604 100644
--- a/test/std/input.output/string.streams/istringstream/istringstream.cons/string.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/istringstream.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream ss(" 123 456");
@@ -64,4 +63,6 @@ int main()
         ss >> i;
         assert(i == 456);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/istringstream.members/str.pass.cpp b/test/std/input.output/string.streams/istringstream/istringstream.members/str.pass.cpp
index 448a6f89b..4c010e2b4 100644
--- a/test/std/input.output/string.streams/istringstream/istringstream.members/str.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/istringstream.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream ss(" 123 456");
@@ -53,4 +52,6 @@ int main()
         ss >> i;
         assert(i == 789);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/istringstream/types.pass.cpp b/test/std/input.output/string.streams/istringstream/types.pass.cpp
index 349bcae1a..973196442 100644
--- a/test/std/input.output/string.streams/istringstream/types.pass.cpp
+++ b/test/std/input.output/string.streams/istringstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <sstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_istream<char>, std::basic_istringstream<char> >::value), "");
     static_assert((std::is_same<std::basic_istringstream<char>::char_type, char>::value), "");
@@ -33,4 +32,6 @@ int main()
     static_assert((std::is_same<std::basic_istringstream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_istringstream<char>::off_type, std::char_traits<char>::off_type>::value), "");
     static_assert((std::is_same<std::basic_istringstream<char>::allocator_type, std::allocator<char> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/ostringstream.assign/member_swap.pass.cpp b/test/std/input.output/string.streams/ostringstream/ostringstream.assign/member_swap.pass.cpp
index 5e24542ab..01cc58ae6 100644
--- a/test/std/input.output/string.streams/ostringstream/ostringstream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/ostringstream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream ss0(" 123 456");
@@ -45,4 +44,6 @@ int main()
         ss0 << i << ' ' << 567;
         assert(ss0.str() == L"234 567");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/ostringstream.assign/move.pass.cpp b/test/std/input.output/string.streams/ostringstream/ostringstream.assign/move.pass.cpp
index 8801001f4..bad3c7316 100644
--- a/test/std/input.output/string.streams/ostringstream/ostringstream.assign/move.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/ostringstream.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream ss0(" 123 456");
@@ -43,4 +42,6 @@ int main()
         ss << i << ' ' << 567;
         assert(ss.str() == L"234 5676");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/ostringstream.assign/nonmember_swap.pass.cpp b/test/std/input.output/string.streams/ostringstream/ostringstream.assign/nonmember_swap.pass.cpp
index c98a2e367..d251e6e08 100644
--- a/test/std/input.output/string.streams/ostringstream/ostringstream.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/ostringstream.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream ss0(" 123 456");
@@ -45,4 +44,6 @@ int main()
         ss0 << i << ' ' << 567;
         assert(ss0.str() == L"234 567");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/ostringstream.cons/default.pass.cpp b/test/std/input.output/string.streams/ostringstream/ostringstream.cons/default.pass.cpp
index dde1dc719..f772a9040 100644
--- a/test/std/input.output/string.streams/ostringstream/ostringstream.cons/default.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/ostringstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream ss;
@@ -43,4 +42,6 @@ int main()
         assert(ss.good());
         assert(ss.str() == L"");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/ostringstream.cons/move.pass.cpp b/test/std/input.output/string.streams/ostringstream/ostringstream.cons/move.pass.cpp
index 67bfc50cd..3b562bafd 100644
--- a/test/std/input.output/string.streams/ostringstream/ostringstream.cons/move.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/ostringstream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream ss0(" 123 456");
@@ -41,4 +40,6 @@ int main()
         ss << i << ' ' << 567;
         assert(ss.str() == L"234 5676");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/ostringstream.cons/string.pass.cpp b/test/std/input.output/string.streams/ostringstream/ostringstream.cons/string.pass.cpp
index 8b90f72d4..98782dce1 100644
--- a/test/std/input.output/string.streams/ostringstream/ostringstream.cons/string.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/ostringstream.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream ss(" 123 456");
@@ -56,4 +55,6 @@ int main()
         ss << i << ' ' << 567;
         assert(ss.str() == L"234 5676");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/ostringstream.members/str.pass.cpp b/test/std/input.output/string.streams/ostringstream/ostringstream.members/str.pass.cpp
index ab277a2ee..56a85159c 100644
--- a/test/std/input.output/string.streams/ostringstream/ostringstream.members/str.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/ostringstream.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream ss(" 123 456");
@@ -49,4 +48,6 @@ int main()
         ss << L"abc";
         assert(ss.str() == L"abc9");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/ostringstream/types.pass.cpp b/test/std/input.output/string.streams/ostringstream/types.pass.cpp
index c9cb76378..0da5f98d4 100644
--- a/test/std/input.output/string.streams/ostringstream/types.pass.cpp
+++ b/test/std/input.output/string.streams/ostringstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <sstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_ostream<char>, std::basic_ostringstream<char> >::value), "");
     static_assert((std::is_same<std::basic_ostringstream<char>::char_type, char>::value), "");
@@ -33,4 +32,6 @@ int main()
     static_assert((std::is_same<std::basic_ostringstream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_ostringstream<char>::off_type, std::char_traits<char>::off_type>::value), "");
     static_assert((std::is_same<std::basic_ostringstream<char>::allocator_type, std::allocator<char> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.assign/member_swap.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.assign/member_swap.pass.cpp
index eaca72454..6977d3189 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.assign/member_swap.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf buf1("testing");
@@ -61,4 +60,6 @@ int main()
         assert(buf.str() == L"testing");
         assert(buf1.str() == L"");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.assign/move.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.assign/move.pass.cpp
index 716b6afa7..653edc0d1 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.assign/move.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf buf1("testing");
@@ -55,4 +54,6 @@ int main()
         buf = move(buf1);
         assert(buf.str() == L"testing");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.assign/nonmember_swap.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.assign/nonmember_swap.pass.cpp
index dca637d39..38562fc32 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf buf1("testing");
@@ -63,4 +62,6 @@ int main()
         assert(buf.str() == L"testing");
         assert(buf1.str() == L"");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.cons/default.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.cons/default.pass.cpp
index af2cccc96..836509f2f 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.cons/default.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct testbuf
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf buf;
@@ -50,4 +49,6 @@ int main()
         testbuf<wchar_t> buf;
         buf.check();
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.cons/move.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.cons/move.pass.cpp
index 14fd0caa5..a3cccd39c 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.cons/move.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf buf1("testing");
@@ -49,4 +48,6 @@ int main()
         std::wstringbuf buf(move(buf1));
         assert(buf.str() == L"testing");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.cons/string.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.cons/string.pass.cpp
index eae1b0b87..de211c80e 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.cons/string.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf buf("testing");
@@ -44,4 +43,6 @@ int main()
         std::wstringbuf buf(L"testing", std::ios_base::out);
         assert(buf.str() == L"testing");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.members/str.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.members/str.pass.cpp
index 712e0edd2..78b572454 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.members/str.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf buf("testing");
@@ -31,4 +30,6 @@ int main()
         buf.str(L"another test");
         assert(buf.str() == L"another test");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/overflow.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/overflow.pass.cpp
index 7eec80837..c9fdd0abc 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/overflow.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/overflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct testbuf
     void pbump(int n) {base::pbump(n);}
 };
 
-int main()
+int main(int, char**)
 {
     {  // sanity check
     testbuf<char> tb("");
@@ -98,4 +97,6 @@ int main()
         assert(sb.sputc('2') == '2');
         assert(sb.str() == "abc12");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/pbackfail.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/pbackfail.pass.cpp
index d6adf6964..458e393c8 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/pbackfail.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/pbackfail.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct testbuf
     void pbump(int n) {base::pbump(n);}
 };
 
-int main()
+int main(int, char**)
 {
     {  // sanity check
     testbuf<char> tb("");
@@ -93,4 +92,6 @@ int main()
         assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
         assert(sb.str() == L"133");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekoff.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekoff.pass.cpp
index 8ec69cb24..1bee5c216 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekoff.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekoff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf sb(std::ios_base::in);
@@ -164,4 +163,6 @@ int main()
         assert(sb.sputc(L'c') == L'c');
         assert(sb.str() == L"0123456c89");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekpos.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekpos.pass.cpp
index 2b809a887..fde91e74b 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekpos.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekpos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf sb("0123456789", std::ios_base::in);
@@ -74,4 +73,6 @@ int main()
         assert(sb.sputc(L'3') == L'3');
         assert(sb.str() == L"0123456789");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/setbuf.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/setbuf.pass.cpp
index 7130f5b86..f833debe3 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/setbuf.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/setbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringbuf sb("0123456789");
@@ -29,4 +28,6 @@ int main()
         assert(sb.pubsetbuf(0, 0) == &sb);
         assert(sb.str() == L"0123456789");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/underflow.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/underflow.pass.cpp
index 3641af239..23b77d229 100644
--- a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/underflow.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/underflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct testbuf
     void pbump(int n) {base::pbump(n);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         testbuf<char> sb("123");
@@ -67,4 +66,6 @@ int main()
         assert(sb.underflow() == L'4');
         assert(sb.underflow() == L'4');
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringbuf/types.pass.cpp b/test/std/input.output/string.streams/stringbuf/types.pass.cpp
index 067a3a29e..c27db8535 100644
--- a/test/std/input.output/string.streams/stringbuf/types.pass.cpp
+++ b/test/std/input.output/string.streams/stringbuf/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <sstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_streambuf<char>, std::basic_stringbuf<char> >::value), "");
     static_assert((std::is_same<std::basic_stringbuf<char>::char_type, char>::value), "");
@@ -33,4 +32,6 @@ int main()
     static_assert((std::is_same<std::basic_stringbuf<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_stringbuf<char>::off_type, std::char_traits<char>::off_type>::value), "");
     static_assert((std::is_same<std::basic_stringbuf<char>::allocator_type, std::allocator<char> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.cons/default.pass.cpp b/test/std/input.output/string.streams/stringstream.cons/default.pass.cpp
index b8905ade3..11cf288fc 100644
--- a/test/std/input.output/string.streams/stringstream.cons/default.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringstream ss;
@@ -43,4 +42,6 @@ int main()
         assert(ss.good());
         assert(ss.str() == L"");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.cons/move.pass.cpp b/test/std/input.output/string.streams/stringstream.cons/move.pass.cpp
index 436c76c5b..2a73ad9c2 100644
--- a/test/std/input.output/string.streams/stringstream.cons/move.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringstream ss0(" 123 456 ");
@@ -49,4 +48,6 @@ int main()
         ss << i << ' ' << 123;
         assert(ss.str() == L"456 1236 ");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.cons/move2.pass.cpp b/test/std/input.output/string.streams/stringstream.cons/move2.pass.cpp
index 94de61610..044e62824 100644
--- a/test/std/input.output/string.streams/stringstream.cons/move2.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.cons/move2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     std::vector<std::istringstream> vecis;
     vecis.push_back(std::istringstream());
@@ -35,4 +34,6 @@ int main()
         vecis[n].seekg(0, std::ios_base::beg);
         assert(vecis[n].str().size() == 31);
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp b/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp
index b87f7eb92..29c81b3be 100644
--- a/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct NoDefaultAllocator : std::allocator<T>
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         std::stringstream ss(" 123 456 ");
@@ -65,4 +64,6 @@ int main()
     //  This test is not required by the standard, but *where else* could it get the allocator?
         assert(sb.str().get_allocator() == s.get_allocator());
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/member_swap.pass.cpp b/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/member_swap.pass.cpp
index 95599dd25..2e0f4471a 100644
--- a/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/member_swap.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringstream ss0(" 123 456 ");
@@ -53,4 +52,6 @@ int main()
         ss0 << i << ' ' << 123;
         assert(ss0.str() == L"456 123");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp b/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp
index 3cce695c4..c3088679e 100644
--- a/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringstream ss0(" 123 456 ");
@@ -51,4 +50,6 @@ int main()
         ss << i << ' ' << 123;
         assert(ss.str() == L"456 1236 ");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/nonmember_swap.pass.cpp b/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/nonmember_swap.pass.cpp
index 3ec11cd9e..06a95dcb3 100644
--- a/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/nonmember_swap.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.cons/stringstream.assign/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringstream ss0(" 123 456 ");
@@ -56,4 +55,6 @@ int main()
         ss0 << i << ' ' << 123;
         assert(ss0.str() == L"456 123");
     }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream.members/str.pass.cpp b/test/std/input.output/string.streams/stringstream.members/str.pass.cpp
index 155a262e1..1dc655193 100644
--- a/test/std/input.output/string.streams/stringstream.members/str.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::stringstream ss(" 123 456 ");
@@ -59,4 +58,11 @@ int main()
         ss << i << ' ' << 321;
         assert(ss.str() == L"89 3219 ");
     }
+    {
+        std::stringstream ss;
+        ss.write("\xd1", 1);
+        assert(ss.str().length() == 1);
+    }
+
+  return 0;
 }
diff --git a/test/std/input.output/string.streams/stringstream/types.pass.cpp b/test/std/input.output/string.streams/stringstream/types.pass.cpp
index a89daa144..580ccb9a4 100644
--- a/test/std/input.output/string.streams/stringstream/types.pass.cpp
+++ b/test/std/input.output/string.streams/stringstream/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <sstream>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::basic_iostream<char>, std::basic_stringstream<char> >::value), "");
     static_assert((std::is_same<std::basic_stringstream<char>::char_type, char>::value), "");
@@ -33,4 +32,6 @@ int main()
     static_assert((std::is_same<std::basic_stringstream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
     static_assert((std::is_same<std::basic_stringstream<char>::off_type, std::char_traits<char>::off_type>::value), "");
     static_assert((std::is_same<std::basic_stringstream<char>::allocator_type, std::allocator<char> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.container/data.pass.cpp b/test/std/iterators/iterator.container/data.pass.cpp
index 12ca91295..952dc6870 100644
--- a/test/std/iterators/iterator.container/data.pass.cpp
+++ b/test/std/iterators/iterator.container/data.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ void test_const_array( const T (&array)[Sz] )
     assert ( std::data(array) == &array[0]);
 }
 
-int main()
+int main(int, char**)
 {
     std::vector<int> v; v.push_back(1);
     std::array<int, 1> a; a[0] = 3;
@@ -84,4 +83,6 @@ int main()
 
     static constexpr int arrA [] { 1, 2, 3 };
     test_const_array ( arrA );
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.container/empty.array.fail.cpp b/test/std/iterators/iterator.container/empty.array.fail.cpp
index a5925dee7..08014776c 100644
--- a/test/std/iterators/iterator.container/empty.array.fail.cpp
+++ b/test/std/iterators/iterator.container/empty.array.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     int c[5];
     std::empty(c);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.container/empty.container.fail.cpp b/test/std/iterators/iterator.container/empty.container.fail.cpp
index 1773b53e7..153ea13b6 100644
--- a/test/std/iterators/iterator.container/empty.container.fail.cpp
+++ b/test/std/iterators/iterator.container/empty.container.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::vector<int> c;
     std::empty(c);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.container/empty.initializer_list.fail.cpp b/test/std/iterators/iterator.container/empty.initializer_list.fail.cpp
index f66575268..5dafb5119 100644
--- a/test/std/iterators/iterator.container/empty.initializer_list.fail.cpp
+++ b/test/std/iterators/iterator.container/empty.initializer_list.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::initializer_list<int> c = { 4 };
     std::empty(c);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.container/empty.pass.cpp b/test/std/iterators/iterator.container/empty.pass.cpp
index f6fe2351d..5c46cd6fb 100644
--- a/test/std/iterators/iterator.container/empty.pass.cpp
+++ b/test/std/iterators/iterator.container/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ void test_const_array( const T (&array)[Sz] )
     assert (!std::empty(array));
 }
 
-int main()
+int main(int, char**)
 {
     std::vector<int> v; v.push_back(1);
     std::list<int>   l; l.push_back(2);
@@ -86,4 +85,6 @@ int main()
 
     static constexpr int arrA [] { 1, 2, 3 };
     test_const_array ( arrA );
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.container/size.pass.cpp b/test/std/iterators/iterator.container/size.pass.cpp
index 6d3bc5128..db215b854 100644
--- a/test/std/iterators/iterator.container/size.pass.cpp
+++ b/test/std/iterators/iterator.container/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ void test_const_array( const T (&array)[Sz] )
     assert ( std::size(array) == Sz );
 }
 
-int main()
+int main(int, char**)
 {
     std::vector<int> v; v.push_back(1);
     std::list<int>   l; l.push_back(2);
@@ -88,4 +87,6 @@ int main()
 
     static constexpr int arrA [] { 1, 2, 3 };
     test_const_array ( arrA );
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.basic/iterator.pass.cpp b/test/std/iterators/iterator.primitives/iterator.basic/iterator.pass.cpp
index 26d5c8660..b5929ca8c 100644
--- a/test/std/iterators/iterator.primitives/iterator.basic/iterator.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.basic/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,10 +72,12 @@ test5()
     static_assert((std::is_same<typename It::iterator_category, std::input_iterator_tag>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test2<A>();
     test3<A>();
     test4<A>();
     test5<A>();
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.operations/advance.pass.cpp b/test/std/iterators/iterator.primitives/iterator.operations/advance.pass.cpp
index ff1b3e7ea..454080563 100644
--- a/test/std/iterators/iterator.primitives/iterator.operations/advance.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.operations/advance.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ constepxr_test(It i, typename std::iterator_traits<It>::difference_type n, It x)
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     const char* s = "1234567890";
@@ -69,4 +68,6 @@ int main()
     static_assert( constepxr_test(s+5, -5, s), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.operations/distance.pass.cpp b/test/std/iterators/iterator.primitives/iterator.operations/distance.pass.cpp
index 2f16fcb38..bd1b02a48 100644
--- a/test/std/iterators/iterator.primitives/iterator.operations/distance.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.operations/distance.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ constexpr_test(It first, It last, typename std::iterator_traits<It>::difference_
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     const char* s = "1234567890";
@@ -58,4 +57,6 @@ int main()
     static_assert( constexpr_test(s, s+10, 10), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.operations/next.pass.cpp b/test/std/iterators/iterator.primitives/iterator.operations/next.pass.cpp
index 1743349a5..87f79fbd3 100644
--- a/test/std/iterators/iterator.primitives/iterator.operations/next.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.operations/next.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ constexpr_test(It i, It x)
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     const char* s = "1234567890";
@@ -84,4 +83,6 @@ int main()
     static_assert( constexpr_test(s, s+1), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.operations/prev.pass.cpp b/test/std/iterators/iterator.primitives/iterator.operations/prev.pass.cpp
index 554445c18..2ee0444ce 100644
--- a/test/std/iterators/iterator.primitives/iterator.operations/prev.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.operations/prev.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ constexpr_test(It i, It x)
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     const char* s = "1234567890";
@@ -75,4 +74,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.traits/const_pointer.pass.cpp b/test/std/iterators/iterator.primitives/iterator.traits/const_pointer.pass.cpp
index f40754fd9..5abf59bf3 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/const_pointer.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/const_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     typedef std::iterator_traits<const A*> It;
     static_assert((std::is_same<It::difference_type, std::ptrdiff_t>::value), "");
@@ -32,4 +31,6 @@ int main()
     static_assert((std::is_same<It::pointer, const A*>::value), "");
     static_assert((std::is_same<It::reference, const A&>::value), "");
     static_assert((std::is_same<It::iterator_category, std::random_access_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.traits/const_volatile_pointer.pass.cpp b/test/std/iterators/iterator.primitives/iterator.traits/const_volatile_pointer.pass.cpp
index a08f35fe9..358abb619 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/const_volatile_pointer.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/const_volatile_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     typedef std::iterator_traits<const volatile A*> It;
     static_assert((std::is_same<It::difference_type, std::ptrdiff_t>::value), "");
@@ -25,4 +24,6 @@ int main()
     static_assert((std::is_same<It::pointer, const volatile A*>::value), "");
     static_assert((std::is_same<It::reference, const volatile A&>::value), "");
     static_assert((std::is_same<It::iterator_category, std::random_access_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.traits/empty.fail.cpp b/test/std/iterators/iterator.primitives/iterator.traits/empty.fail.cpp
index 021523481..728909e69 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/empty.fail.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/empty.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,59 +63,61 @@ struct NotAnIteratorNoCategory
 //     typedef std::forward_iterator_tag iterator_category;
 };
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::iterator_traits<NotAnIteratorEmpty> T;
-    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::__1::iterator_traits<{{.+}}>}}
+    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
     }
 
     {
     typedef std::iterator_traits<NotAnIteratorNoDifference> T;
-    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::__1::iterator_traits<{{.+}}>}}
+    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
     }
 
     {
     typedef std::iterator_traits<NotAnIteratorNoValue> T;
-    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::__1::iterator_traits<{{.+}}>}}
+    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
     }
 
     {
     typedef std::iterator_traits<NotAnIteratorNoPointer> T;
-    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::__1::iterator_traits<{{.+}}>}}
+    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
     }
 
     {
     typedef std::iterator_traits<NotAnIteratorNoReference> T;
-    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::__1::iterator_traits<{{.+}}>}}
+    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
     }
 
     {
     typedef std::iterator_traits<NotAnIteratorNoCategory> T;
-    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::__1::iterator_traits<{{.+}}>}}
-    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::__1::iterator_traits<{{.+}}>}}
+    typedef T::difference_type   DT; // expected-error-re {{no type named 'difference_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::value_type        VT; // expected-error-re {{no type named 'value_type' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::pointer           PT; // expected-error-re {{no type named 'pointer' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::reference         RT; // expected-error-re {{no type named 'reference' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
+    typedef T::iterator_category CT; // expected-error-re {{no type named 'iterator_category' in 'std::{{.+}}::iterator_traits<{{.+}}>}}
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp b/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
index 179e5e762..35fc877f2 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,8 +30,10 @@ public:
     static const bool value = sizeof(test<T>(0)) == 1;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::iterator_traits<not_an_iterator> It;
     static_assert(!(has_value_type<It>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.traits/iterator.pass.cpp b/test/std/iterators/iterator.primitives/iterator.traits/iterator.pass.cpp
index 34f430ff3..1e4d87c75 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/iterator.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct test_iterator
     typedef std::forward_iterator_tag iterator_category;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::iterator_traits<test_iterator> It;
     static_assert((std::is_same<It::difference_type, int>::value), "");
@@ -41,4 +40,6 @@ int main()
     static_assert((std::is_same<It::pointer, A*>::value), "");
     static_assert((std::is_same<It::reference, A&>::value), "");
     static_assert((std::is_same<It::iterator_category, std::forward_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.traits/pointer.pass.cpp b/test/std/iterators/iterator.primitives/iterator.traits/pointer.pass.cpp
index 5a8fe6077..6016f6d40 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/pointer.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     typedef std::iterator_traits<A*> It;
     static_assert((std::is_same<It::difference_type, std::ptrdiff_t>::value), "");
@@ -32,4 +31,6 @@ int main()
     static_assert((std::is_same<It::pointer, A*>::value), "");
     static_assert((std::is_same<It::reference, A&>::value), "");
     static_assert((std::is_same<It::iterator_category, std::random_access_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/iterator.traits/volatile_pointer.pass.cpp b/test/std/iterators/iterator.primitives/iterator.traits/volatile_pointer.pass.cpp
index 1630feb25..035360645 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/volatile_pointer.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/volatile_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     typedef std::iterator_traits<volatile A*> It;
     static_assert((std::is_same<It::difference_type, std::ptrdiff_t>::value), "");
@@ -25,4 +24,6 @@ int main()
     static_assert((std::is_same<It::pointer, volatile A*>::value), "");
     static_assert((std::is_same<It::reference, volatile A&>::value), "");
     static_assert((std::is_same<It::iterator_category, std::random_access_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/nothing_to_do.pass.cpp b/test/std/iterators/iterator.primitives/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.primitives/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.primitives/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/std.iterator.tags/bidirectional_iterator_tag.pass.cpp b/test/std/iterators/iterator.primitives/std.iterator.tags/bidirectional_iterator_tag.pass.cpp
index ecda1d146..8380fb6b4 100644
--- a/test/std/iterators/iterator.primitives/std.iterator.tags/bidirectional_iterator_tag.pass.cpp
+++ b/test/std/iterators/iterator.primitives/std.iterator.tags/bidirectional_iterator_tag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::bidirectional_iterator_tag tag;
     ((void)tag); // Prevent unused warning
@@ -22,4 +21,6 @@ int main()
                                    std::bidirectional_iterator_tag>::value), "");
     static_assert((!std::is_base_of<std::output_iterator_tag,
                                     std::bidirectional_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/std.iterator.tags/forward_iterator_tag.pass.cpp b/test/std/iterators/iterator.primitives/std.iterator.tags/forward_iterator_tag.pass.cpp
index e11b8e9ba..0afdc3eca 100644
--- a/test/std/iterators/iterator.primitives/std.iterator.tags/forward_iterator_tag.pass.cpp
+++ b/test/std/iterators/iterator.primitives/std.iterator.tags/forward_iterator_tag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::forward_iterator_tag tag;
     ((void)tag); // Prevent unused warning
@@ -22,4 +21,6 @@ int main()
                                    std::forward_iterator_tag>::value), "");
     static_assert((!std::is_base_of<std::output_iterator_tag,
                                     std::forward_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/std.iterator.tags/input_iterator_tag.pass.cpp b/test/std/iterators/iterator.primitives/std.iterator.tags/input_iterator_tag.pass.cpp
index 19b517c32..26de37448 100644
--- a/test/std/iterators/iterator.primitives/std.iterator.tags/input_iterator_tag.pass.cpp
+++ b/test/std/iterators/iterator.primitives/std.iterator.tags/input_iterator_tag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::input_iterator_tag tag;
     ((void)tag); // Prevent unused warning
     static_assert((!std::is_base_of<std::output_iterator_tag,
                                     std::input_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/std.iterator.tags/output_iterator_tag.pass.cpp b/test/std/iterators/iterator.primitives/std.iterator.tags/output_iterator_tag.pass.cpp
index e315b2724..657e6f8ea 100644
--- a/test/std/iterators/iterator.primitives/std.iterator.tags/output_iterator_tag.pass.cpp
+++ b/test/std/iterators/iterator.primitives/std.iterator.tags/output_iterator_tag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::output_iterator_tag tag;
     ((void)tag); // Prevent unused warning
     static_assert((!std::is_base_of<std::input_iterator_tag,
                                     std::output_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.primitives/std.iterator.tags/random_access_iterator_tag.pass.cpp b/test/std/iterators/iterator.primitives/std.iterator.tags/random_access_iterator_tag.pass.cpp
index f16a3b74c..5448a6715 100644
--- a/test/std/iterators/iterator.primitives/std.iterator.tags/random_access_iterator_tag.pass.cpp
+++ b/test/std/iterators/iterator.primitives/std.iterator.tags/random_access_iterator_tag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::random_access_iterator_tag tag;
     ((void)tag); // Prevent unused warning
@@ -22,4 +21,6 @@ int main()
                                    std::random_access_iterator_tag>::value), "");
     static_assert((!std::is_base_of<std::output_iterator_tag,
                                     std::random_access_iterator_tag>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.range/begin-end.fail.cpp b/test/std/iterators/iterator.range/begin-end.fail.cpp
index 18c5943a4..69a278434 100644
--- a/test/std/iterators/iterator.range/begin-end.fail.cpp
+++ b/test/std/iterators/iterator.range/begin-end.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,11 +40,13 @@ namespace Foo {
 }
 
 
-int main(){
+int main(int, char**) {
 // Bug #28927 - shouldn't find these via ADL
     TEST_IGNORE_NODISCARD  std::cbegin (Foo::FakeContainer());
     TEST_IGNORE_NODISCARD  std::cend   (Foo::FakeContainer());
     TEST_IGNORE_NODISCARD  std::crbegin(Foo::FakeContainer());
     TEST_IGNORE_NODISCARD  std::crend  (Foo::FakeContainer());
+
+  return 0;
 }
 #endif
diff --git a/test/std/iterators/iterator.range/begin-end.pass.cpp b/test/std/iterators/iterator.range/begin-end.pass.cpp
index 201dd066b..7580b463d 100644
--- a/test/std/iterators/iterator.range/begin-end.pass.cpp
+++ b/test/std/iterators/iterator.range/begin-end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -136,7 +135,7 @@ void test_const_array( const T (&array)[Sz] ) {
 #endif
     }
 
-int main(){
+int main(int, char**) {
     std::vector<int> v; v.push_back(1);
     std::list<int> l;   l.push_back(2);
     std::array<int, 1> a; a[0] = 3;
@@ -198,4 +197,6 @@ int main(){
         static_assert ( *std::crbegin(c) == 4, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/bidirectional.iterators/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/bidirectional.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/bidirectional.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/bidirectional.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/forward.iterators/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/forward.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/forward.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/forward.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/input.iterators/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/input.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/input.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/input.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/iterator.iterators/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/iterator.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/iterator.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/iterator.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/iterator.requirements.general/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/iterator.requirements.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/iterator.requirements.general/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/iterator.requirements.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/output.iterators/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/output.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/output.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/output.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.requirements/random.access.iterators/nothing_to_do.pass.cpp b/test/std/iterators/iterator.requirements/random.access.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.requirements/random.access.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.requirements/random.access.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterator.synopsis/nothing_to_do.pass.cpp b/test/std/iterators/iterator.synopsis/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterator.synopsis/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterator.synopsis/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/iterators.general/gcc_workaround.pass.cpp b/test/std/iterators/iterators.general/gcc_workaround.pass.cpp
index 7578e7182..09b4d7628 100644
--- a/test/std/iterators/iterators.general/gcc_workaround.pass.cpp
+++ b/test/std/iterators/iterators.general/gcc_workaround.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,4 +17,6 @@ void f(const std::string &s) { TEST_IGNORE_NODISCARD s.begin(); }
 
 void AppendTo(const std::vector<char> &v) { TEST_IGNORE_NODISCARD v.begin(); }
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/iterators/iterators.general/nothing_to_do.pass.cpp b/test/std/iterators/iterators.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/iterators.general/nothing_to_do.pass.cpp
+++ b/test/std/iterators/iterators.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.fail.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.fail.cpp
index 5dd49a625..9aad14992 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.fail.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <iterator>
 #include <vector>
 
-int main()
+int main(int, char**)
 {
     std::back_insert_iterator<std::vector<int> > i = std::vector<int>();
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.pass.cpp
index f280adb73..2aad3fa3f 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.cons/container.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,8 +23,10 @@ test(C c)
     std::back_insert_iterator<C> i(c);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/post.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/post.pass.cpp
index c6ff0473f..d36b1ce06 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/post.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,8 +28,10 @@ test(C c)
     assert(c.back() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/pre.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/pre.pass.cpp
index 2b9f245a0..512eb1e56 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/pre.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op++/pre.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ test(C c)
     assert(&r == &i);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/lv_value.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/lv_value.pass.cpp
index d3d1fbbcb..2b76a2714 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/lv_value.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/lv_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,9 @@ public:
         {return x.data_ == y.data_;}
 };
 
-int main()
+int main(int, char**)
 {
     test(std::vector<Copyable>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/rv_value.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/rv_value.pass.cpp
index d5df1b7c0..506b7b6f0 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/rv_value.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op=/rv_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,9 @@ test(C c)
     assert(c.back() == typename C::value_type());
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<std::unique_ptr<int> >());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op_astrk/test.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op_astrk/test.pass.cpp
index f50f309e6..460f723a4 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op_astrk/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.insert.iter.op_astrk/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ test(C c)
     assert(&r == &i);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.inserter/test.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.inserter/test.pass.cpp
index 30e41407e..bd6df6448 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.inserter/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/back.inserter/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ test(C c)
     assert(c.back() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iter.ops/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iterator/types.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iterator/types.pass.cpp
index 7aa7f3443..470392bc5 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/back.insert.iterator/types.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/back.insert.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,9 @@ test()
     static_assert((std::is_same<typename R::iterator_category, std::output_iterator_tag>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int> >();
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.fail.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.fail.cpp
index 96d5d000d..eb3346b2e 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.fail.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <iterator>
 #include <list>
 
-int main()
+int main(int, char**)
 {
     std::front_insert_iterator<std::list<int> > i = std::list<int>();
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.pass.cpp
index 1a148e613..2ef4ba879 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.cons/container.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,8 +23,10 @@ test(C c)
     std::front_insert_iterator<C> i(c);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::list<int>());
     test(nasty_list<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/post.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/post.pass.cpp
index 74892272e..7c9b09ffd 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/post.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,8 +28,10 @@ test(C c)
     assert(c.back() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::list<int>());
     test(nasty_list<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/pre.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/pre.pass.cpp
index e6d6c0760..ea5c02410 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/pre.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op++/pre.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ test(C c)
     assert(&r == &i);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::list<int>());
     test(nasty_list<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/lv_value.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/lv_value.pass.cpp
index cdca9bf4b..5e1a86d57 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/lv_value.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/lv_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,8 +39,10 @@ public:
         {return x.data_ == y.data_;}
 };
 
-int main()
+int main(int, char**)
 {
     test(std::list<Copyable>());
     test(nasty_list<Copyable>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/rv_value.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/rv_value.pass.cpp
index af880f871..450f395d4 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/rv_value.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op=/rv_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,9 @@ test(C c)
     assert(c.front() == typename C::value_type());
 }
 
-int main()
+int main(int, char**)
 {
     test(std::list<std::unique_ptr<int> >());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op_astrk/test.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op_astrk/test.pass.cpp
index 1ff49dde4..3367229b4 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op_astrk/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.insert.iter.op_astrk/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ test(C c)
     assert(&r == &i);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::list<int>());
     test(nasty_list<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.inserter/test.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.inserter/test.pass.cpp
index c18f84baf..b7436778d 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.inserter/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/front.inserter/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ test(C c)
     assert(c.front() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::list<int>());
     test(nasty_list<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iter.ops/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iterator/types.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iterator/types.pass.cpp
index 7a7c678ed..c65a8e6f6 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/front.insert.iterator/types.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/front.insert.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,9 @@ test()
     static_assert((std::is_same<typename R::iterator_category, std::output_iterator_tag>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int> >();
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.cons/test.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.cons/test.pass.cpp
index 9f17240a7..531dac03c 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.cons/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.cons/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,8 +23,10 @@ test(C c)
     std::insert_iterator<C> i(c, c.begin());
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/post.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/post.pass.cpp
index 7d81a7b72..a3148e2e2 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/post.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,8 +28,10 @@ test(C c)
     assert(c.back() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/pre.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/pre.pass.cpp
index 08e6ced01..99c686095 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/pre.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op++/pre.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ test(C c)
     assert(&r == &i);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/lv_value.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/lv_value.pass.cpp
index 01eb35efc..fe8260b99 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/lv_value.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/lv_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ insert3at(C& c, typename C::iterator i,
     c.insert(++i, x3);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::vector<int> C;
@@ -82,4 +81,6 @@ int main()
     insert3at(c2, c2.begin()+3, 'a', 'b', 'c');
     test(c1, 3, 'a', 'b', 'c', c2);
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/rv_value.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/rv_value.pass.cpp
index ad1fa29ac..7a5addb1a 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/rv_value.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op=/rv_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct do_nothing
     void operator()(void*) const {}
 };
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::unique_ptr<int, do_nothing> Ptr;
@@ -92,4 +91,6 @@ int main()
     insert3at(c2, c2.begin()+3, Ptr(x+3), Ptr(x+4), Ptr(x+5));
     test(std::move(c1), 3, Ptr(x+3), Ptr(x+4), Ptr(x+5), c2);
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op_astrk/test.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op_astrk/test.pass.cpp
index 1a926b548..8ef0383ee 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op_astrk/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/insert.iter.op_astrk/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ test(C c)
     assert(&r == &i);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/inserter/test.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/inserter/test.pass.cpp
index 43f28d09b..e1ee829bc 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/inserter/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/inserter/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,8 +27,10 @@ test(C c)
     assert(c.back() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::vector<int>());
     test(nasty_vector<int>());
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iter.ops/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/insert.iterator/types.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/insert.iterator/types.pass.cpp
index e379b3057..1e199b305 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/insert.iterator/types.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/insert.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,9 @@ test()
     static_assert((std::is_same<typename R::iterator_category, std::output_iterator_tag>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::vector<int> >();
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/insert.iterators/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/insert.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/insert.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/insert.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/make_move_iterator.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/make_move_iterator.pass.cpp
index 99ff9641a..3a9b467e0 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/make_move_iterator.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/make_move_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i)
     assert(std::make_move_iterator(i) == r);
 }
 
-int main()
+int main(int, char**)
 {
     {
     char s[] = "1234567890";
@@ -54,4 +53,6 @@ int main()
     static_assert(iter.base() == p);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/minus.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/minus.pass.cpp
index 758ef0f21..e3b881edc 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/minus.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ test(It l, It r, typename std::iterator_traits<It>::difference_type x)
     assert(r1 - r2 == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s+5), random_access_iterator<char*>(s), 5);
@@ -50,4 +49,6 @@ int main()
     static_assert( it2 - it1 ==  1, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/plus.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/plus.pass.cpp
index 54b79b511..5e1965e19 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/plus.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(rr.base() == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s+5), 5, random_access_iterator<char*>(s+10));
@@ -50,4 +49,6 @@ int main()
     static_assert(it2 == it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+/difference_type.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+/difference_type.pass.cpp
index e74be5e24..1e3244e19 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(rr.base() == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
@@ -49,4 +48,6 @@ int main()
     static_assert(it2 == it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+=/difference_type.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+=/difference_type.pass.cpp
index 6b4396c83..863e06c0e 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+=/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+=/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
@@ -50,4 +49,6 @@ int main()
     static_assert(it2 == it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-/difference_type.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-/difference_type.pass.cpp
index 460636df7..3cf76f5da 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(rr.base() == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
@@ -49,4 +48,6 @@ int main()
     static_assert(it2 != it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-=/difference_type.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-=/difference_type.pass.cpp
index 1b2ce8f0d..5692f7088 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-=/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-=/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
@@ -46,4 +45,6 @@ int main()
     static_assert(it1 == it2, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_eq.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_eq.pass.cpp
index a365f08f3..ecf8f90ea 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_eq.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 == r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(input_iterator<char*>(s), input_iterator<char*>(s), true);
@@ -59,4 +58,6 @@ int main()
     static_assert(!(it2 == it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gt.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gt.pass.cpp
index ddd59a617..3da38b376 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gt.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 > r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s), false);
@@ -55,4 +54,6 @@ int main()
     static_assert( (it2 > it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gte.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gte.pass.cpp
index e78082e34..dceb41151 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gte.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gte.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 >= r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s), true);
@@ -55,4 +54,6 @@ int main()
     static_assert( (it2 >= it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lt.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lt.pass.cpp
index 37034d516..675e55f78 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lt.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 < r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s), false);
@@ -55,4 +54,6 @@ int main()
     static_assert(!(it2 < it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lte.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lte.pass.cpp
index 5074ee33a..a2ac0b7a6 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lte.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lte.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 <= r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s), true);
@@ -55,4 +54,6 @@ int main()
     static_assert(!(it2 <= it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_neq.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_neq.pass.cpp
index 8e6c827fd..01a7195d4 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_neq.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_neq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 != r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "1234567890";
     test(input_iterator<char*>(s), input_iterator<char*>(s), false);
@@ -59,4 +58,6 @@ int main()
     static_assert( (it2 != it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.fail.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.fail.cpp
index 22d267af9..b91767b08 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.fail.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,9 +29,11 @@ test(U u)
 struct base {};
 struct derived {};
 
-int main()
+int main(int, char**)
 {
     derived d;
 
     test<base*>(&d);
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.pass.cpp
index 36d365194..7f31920f7 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(U u)
 struct Base {};
 struct Derived : Base {};
 
-int main()
+int main(int, char**)
 {
     Derived d;
 
@@ -53,4 +52,6 @@ int main()
     static_assert(it2.base() == p);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/default.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/default.pass.cpp
index 404e02cd7..6dfa0d09d 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/default.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test()
     (void)r;
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<char*> >();
     test<forward_iterator<char*> >();
@@ -42,4 +41,6 @@ int main()
     (void)it;
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.fail.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.fail.cpp
index 188acff69..28648b815 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.fail.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,8 +23,10 @@ test(It i)
     std::move_iterator<It> r = i;
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "123";
     test(s);
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.pass.cpp
index 09a534b66..bed97700e 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(It i)
     assert(r.base() == i);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "123";
     test(input_iterator<char*>(s));
@@ -45,4 +44,6 @@ int main()
     static_assert(it.base() == p);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.conv/tested_elsewhere.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.conv/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.conv/tested_elsewhere.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.conv/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/post.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/post.pass.cpp
index f5f921a77..38d523297 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/post.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(rr.base() == i);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "123";
     test(bidirectional_iterator<char*>(s+1), bidirectional_iterator<char*>(s));
@@ -50,4 +49,6 @@ int main()
     static_assert(it2 == it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/pre.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/pre.pass.cpp
index c434b3082..e98fb6b09 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/pre.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/pre.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "123";
     test(bidirectional_iterator<char*>(s+1), bidirectional_iterator<char*>(s));
@@ -50,4 +49,6 @@ int main()
     static_assert(it2 != it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/post.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/post.pass.cpp
index 4ff511c13..50597a54b 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/post.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(rr.base() == i);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "123";
     test(input_iterator<char*>(s), input_iterator<char*>(s+1));
@@ -52,4 +51,6 @@ int main()
     static_assert(it2 != it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/pre.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/pre.pass.cpp
index e5d570429..101f5cdbc 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/pre.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/pre.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "123";
     test(input_iterator<char*>(s), input_iterator<char*>(s+1));
@@ -52,4 +51,6 @@ int main()
     static_assert(it2 == it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.index/difference_type.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.index/difference_type.pass.cpp
index bf7a8e33e..ecf3b6105 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.index/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.index/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct do_nothing
     void operator()(void*) const {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         char s[] = "1234567890";
@@ -65,4 +64,6 @@ int main()
     static_assert(it1[5] == '6', "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/op_arrow.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/op_arrow.pass.cpp
index ef87014cd..6024f99fe 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/op_arrow.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/op_arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(It i)
     assert(r.operator->() == i);
 }
 
-int main()
+int main(int, char**)
 {
     char s[] = "123";
     test(s);
@@ -43,4 +42,6 @@ int main()
     static_assert(it2.operator->() == p + 1, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.star/op_star.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.star/op_star.pass.cpp
index 4c5d816b8..e6e826d83 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.star/op_star.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.star/op_star.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ struct do_nothing
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         A a;
@@ -71,4 +70,6 @@ int main()
     static_assert(*it2 == p[1], "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.fail.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.fail.cpp
index 089cc29b2..94d012dfb 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.fail.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,8 +31,10 @@ test(U u)
 struct base {};
 struct derived {};
 
-int main()
+int main(int, char**)
 {
     derived d;
     test<base*>(&d);
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.pass.cpp
index 30a95c367..84fbccb8b 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ test(U u)
 struct Base {};
 struct Derived : Base {};
 
-int main()
+int main(int, char**)
 {
     Derived d;
 
@@ -57,4 +56,6 @@ int main()
     static_assert(it2.base() == p, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.ops/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iter.requirements/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iter.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iter.requirements/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iter.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp
index a6d4d61e1..905952f42 100644
--- a/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/move.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ test()
     static_assert((std::is_same<typename R::iterator_category, typename T::iterator_category>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<char*> >();
     test<forward_iterator<char*> >();
@@ -92,4 +91,6 @@ int main()
         static_assert(std::is_same<It::reference, int&&>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/move.iterators/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/move.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/move.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/move.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/default.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/default.pass.cpp
index 88fd0def5..32931eefa 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/default.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test()
     (void)r;
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<const char*> >();
     test<random_access_iterator<char*> >();
@@ -41,4 +40,6 @@ int main()
         (void)it;
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.fail.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.fail.cpp
index 3f42f06ee..6130386b0 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.fail.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,8 +23,10 @@ test(It i)
     std::reverse_iterator<It> r = i;
 }
 
-int main()
+int main(int, char**)
 {
     const char s[] = "123";
     test(s);
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.pass.cpp
index 4bf816d28..32cc74f95 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(It i)
     assert(r.base() == i);
 }
 
-int main()
+int main(int, char**)
 {
     const char s[] = "123";
     test(bidirectional_iterator<const char*>(s));
@@ -43,4 +42,6 @@ int main()
         static_assert(it.base() == p);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.fail.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.fail.cpp
index c0a9afecb..5a878e493 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.fail.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,9 +29,11 @@ test(U u)
 struct base {};
 struct derived {};
 
-int main()
+int main(int, char**)
 {
     derived d;
 
     test<base*>(&d);
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.pass.cpp
index 798f9a805..53b82bd40 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.cons/reverse_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(U u)
 struct Base {};
 struct Derived : Base {};
 
-int main()
+int main(int, char**)
 {
     Derived d;
 
@@ -51,4 +50,6 @@ int main()
         static_assert(it2.base() == p);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.conv/tested_elsewhere.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.conv/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.conv/tested_elsewhere.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.conv/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.make/make_reverse_iterator.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.make/make_reverse_iterator.pass.cpp
index 4cf82179c..fa7026dde 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.make/make_reverse_iterator.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.make/make_reverse_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(It i)
     assert(r.base() == i);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     random_access_iterator<const char*>b(s);
@@ -47,5 +46,7 @@ int main()
         static_assert(it1.base() == p, "");
     }
 #endif
+
+  return 0;
 }
 
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op!=/test.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op!=/test.pass.cpp
index 9c53bbbfe..f3e749709 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op!=/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op!=/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 != r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s), false);
@@ -54,4 +53,6 @@ int main()
         static_assert( (it1 != it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/post.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/post.pass.cpp
index 7d9edd5b0..d7658ccfc 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/post.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(rr.base() == i);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "123";
     test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s));
@@ -50,4 +49,6 @@ int main()
         static_assert(it2 == it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/pre.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/pre.pass.cpp
index 7e75344ab..edc74fab5 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/pre.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op++/pre.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "123";
     test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s));
@@ -51,4 +50,6 @@ int main()
         static_assert(*(++std::make_reverse_iterator(p+2)) == '1', "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+/difference_type.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+/difference_type.pass.cpp
index c485b0483..9b30f59da 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(rr.base() == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
@@ -49,4 +48,6 @@ int main()
         static_assert(it2 != it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+=/difference_type.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+=/difference_type.pass.cpp
index 67ad1ae88..229f3ca11 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+=/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op+=/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
@@ -46,4 +45,6 @@ int main()
         static_assert(it1 == it2, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/post.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/post.pass.cpp
index 5a06ea5ad..8b9912c81 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/post.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(rr.base() == i);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "123";
     test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s+2));
@@ -50,4 +49,6 @@ int main()
         static_assert(it2 != it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/pre.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/pre.pass.cpp
index 326562476..9ccab06e8 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/pre.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op--/pre.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "123";
     test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s+2));
@@ -51,4 +50,6 @@ int main()
         static_assert(*(--std::make_reverse_iterator(p)) == '1', "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-/difference_type.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-/difference_type.pass.cpp
index 5c34417c3..0e3a5d362 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(rr.base() == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
@@ -49,4 +48,6 @@ int main()
         static_assert(it2 == it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-=/difference_type.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-=/difference_type.pass.cpp
index 3bed189dc..ab92dc068 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-=/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op-=/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(&rr == &r);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
@@ -46,4 +45,6 @@ int main()
         static_assert(it1 == it2, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op.star/op_star.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op.star/op_star.pass.cpp
index 62ca76495..820ee0060 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op.star/op_star.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op.star/op_star.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test(It i, typename std::iterator_traits<It>::value_type x)
     assert(*r == x);
 }
 
-int main()
+int main(int, char**)
 {
     A a;
     test(&a+1, A());
@@ -59,4 +58,6 @@ int main()
         static_assert(*it2 == p[1], "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.fail.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.fail.cpp
index 18f978012..071e3ef10 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.fail.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,8 +31,10 @@ test(U u)
 struct base {};
 struct derived {};
 
-int main()
+int main(int, char**)
 {
     derived d;
     test<base*>(&d);
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.pass.cpp
index 59f721838..838bdc917 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op=/reverse_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ test(U u)
 struct Base {};
 struct Derived : Base {};
 
-int main()
+int main(int, char**)
 {
     Derived d;
 
@@ -56,4 +55,6 @@ int main()
         static_assert(it2.base() == p, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op==/test.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op==/test.pass.cpp
index 1d4d09158..7bd699bb9 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op==/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.op==/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 == r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s), true);
@@ -55,4 +54,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opdiff/test.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opdiff/test.pass.cpp
index 9ef8c30b4..ce9012348 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opdiff/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opdiff/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ test(It1 l, It2 r, std::ptrdiff_t x)
     assert((r1 - r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     char s[3] = {0};
     test(random_access_iterator<const char*>(s), random_access_iterator<char*>(s), 0);
@@ -54,4 +53,6 @@ int main()
         static_assert( it2 - it1 == -1, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt/test.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt/test.pass.cpp
index e0e0059ac..86b19e3fc 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 > r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), false);
@@ -54,4 +53,6 @@ int main()
         static_assert( (it1 > it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt=/test.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt=/test.pass.cpp
index f0ff828b5..de5328120 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt=/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opgt=/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 >= r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), true);
@@ -54,4 +53,6 @@ int main()
         static_assert( (it1 >= it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opindex/difference_type.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opindex/difference_type.pass.cpp
index 4596d6f38..bc20d1381 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opindex/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opindex/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n,
     assert(rr == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 4, '1');
@@ -46,4 +45,6 @@ int main()
     static_assert(it1[4] == '1', "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt/test.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt/test.pass.cpp
index 4ff57518d..e49821f83 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 < r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), false);
@@ -54,4 +53,6 @@ int main()
         static_assert(!(it1 < it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt=/test.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt=/test.pass.cpp
index 9fb6310b9..927523611 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt=/test.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.oplt=/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(It l, It r, bool x)
     assert((r1 <= r2) == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), true);
@@ -54,4 +53,6 @@ int main()
         static_assert(!(it1 <= it3), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opref/op_arrow.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opref/op_arrow.pass.cpp
index 7b829ff6a..f16fb2757 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opref/op_arrow.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opref/op_arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -77,7 +76,7 @@ public:
 
 TEST_CONSTEXPR  C gC;
 
-int main()
+int main(int, char**)
 {
     A a;
     test(&a+1, A());
@@ -116,4 +115,6 @@ int main()
     {
         ((void)gC);
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opsum/difference_type.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opsum/difference_type.pass.cpp
index 00f739d09..ba3844851 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opsum/difference_type.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.opsum/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(It i, typename std::iterator_traits<It>::difference_type n, It x)
     assert(rr.base() == x);
 }
 
-int main()
+int main(int, char**)
 {
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
@@ -50,4 +49,6 @@ int main()
         static_assert(it2 != it3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.requirements/nothing_to_do.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.requirements/nothing_to_do.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iter.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iterator/types.pass.cpp b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iterator/types.pass.cpp
index 292a77787..11ac62525 100644
--- a/test/std/iterators/predef.iterators/reverse.iterators/reverse.iterator/types.pass.cpp
+++ b/test/std/iterators/predef.iterators/reverse.iterators/reverse.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,9 +52,11 @@ test()
     static_assert((std::is_same<typename R::iterator_category, typename T::iterator_category>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<bidirectional_iterator<char*> >();
     test<random_access_iterator<char*> >();
     test<char*>();
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/copy.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/copy.pass.cpp
index fc6dc0009..d6a3b0862 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/copy.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::istream_iterator<int> io;
@@ -37,4 +36,6 @@ int main()
         j = *i;
         assert(j == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.fail.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.fail.cpp
index 452049677..e2bebbaea 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.fail.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 struct S { S(); }; // not constexpr
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     {
@@ -29,4 +28,6 @@ int main()
 #else
 #error "C++11 only test"
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp
index 937bb8d3a..fa43566dd 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ void operator ()() const {}
 #endif
 
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::istream_iterator<int> T;
@@ -62,4 +61,6 @@ int main()
     test_trivial<S>()();
     test_trivial<std::string>()();
 #endif
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/istream.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/istream.pass.cpp
index 12a6f90e8..a4c47974d 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/istream.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.cons/istream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::istringstream inf(" 1 23");
     std::istream_iterator<int> i(inf);
@@ -27,4 +26,6 @@ int main()
     int j = 0;
     inf >> j;
     assert(j == 23);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/arrow.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/arrow.pass.cpp
index 30057a227..5409cc595 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/arrow.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,10 +29,12 @@ std::istream& operator>>(std::istream& is, A& a)
     return is >> a.d_ >> a.i_;
 }
 
-int main()
+int main(int, char**)
 {
     std::istringstream inf("1.5  23 ");
     std::istream_iterator<A> i(inf);
     assert(i->d_ == 1.5);
     assert(i->i_ == 23);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/dereference.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/dereference.pass.cpp
index e6f86d483..c99e723b0 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/dereference.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/dereference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::istringstream inf(" 1 23");
     std::istream_iterator<int> i(inf);
@@ -31,4 +30,6 @@ int main()
     assert(j == 23);
     j = *i;
     assert(j == 23);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/equal.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/equal.pass.cpp
index d1824bae6..616a3ca38 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/equal.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::istringstream inf1(" 1 23");
     std::istringstream inf2(" 1 23");
@@ -52,4 +51,6 @@ int main()
 
     assert(std::operator==(i1, i2));
     assert(std::operator!=(i1, i3));
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/post_increment.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/post_increment.pass.cpp
index f5c49e379..83d206e71 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/post_increment.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/post_increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::istringstream inf(" 1 23");
     std::istream_iterator<int> i(inf);
@@ -29,4 +28,6 @@ int main()
     j = 0;
     j = *icopy;
     assert(j == 1);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/pre_increment.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/pre_increment.pass.cpp
index 87173f7dc..ab61f57f9 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/pre_increment.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/istream.iterator.ops/pre_increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::istringstream inf(" 1 23");
     std::istream_iterator<int> i(inf);
@@ -26,4 +25,6 @@ int main()
     int j = 0;
     j = *i;
     assert(j == 23);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istream.iterator/types.pass.cpp b/test/std/iterators/stream.iterators/istream.iterator/types.pass.cpp
index 3046ced75..5170b1e53 100644
--- a/test/std/iterators/stream.iterators/istream.iterator/types.pass.cpp
+++ b/test/std/iterators/stream.iterators/istream.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::istream_iterator<double> I1; // double is trivially destructible
 #if TEST_STD_VER <= 14
@@ -83,4 +82,6 @@ int main()
     typedef std::istream_iterator<std::string> I3; // string is NOT trivially destructible
     static_assert(!std::is_trivially_copy_constructible<I3>::value, "");
     static_assert(!std::is_trivially_destructible<I3>::value, "");
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/default.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/default.pass.cpp
index c71ee4099..9502e0da7 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/default.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::istreambuf_iterator<char> T;
@@ -42,4 +41,6 @@ int main()
         (void)it2;
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/istream.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/istream.pass.cpp
index 69e98265e..b51d19a8e 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/istream.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/istream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf;
@@ -39,4 +38,6 @@ int main()
         std::istreambuf_iterator<wchar_t> i(inf);
         assert(i != std::istreambuf_iterator<wchar_t>());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/proxy.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/proxy.pass.cpp
index f5a5fa0c6..87afe840d 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/proxy.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/proxy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf("abc");
@@ -33,4 +32,6 @@ int main()
         assert(i != std::istreambuf_iterator<wchar_t>());
         assert(*i == L'b');
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/streambuf.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/streambuf.pass.cpp
index 020b4f24b..d92cddde1 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/streambuf.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator.cons/streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istreambuf_iterator<char> i(nullptr);
@@ -47,4 +46,6 @@ int main()
         std::istreambuf_iterator<wchar_t> i(inf.rdbuf());
         assert(i != std::istreambuf_iterator<wchar_t>());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_equal/equal.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_equal/equal.pass.cpp
index 013766431..1fcdf7af1 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_equal/equal.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_equal/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf1("abc");
@@ -97,4 +96,6 @@ int main()
         assert( i5.equal(i4));
         assert( i5.equal(i5));
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op!=/not_equal.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op!=/not_equal.pass.cpp
index 81e5f3439..d4184aa6c 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op!=/not_equal.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op!=/not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf1("abc");
@@ -99,4 +98,6 @@ int main()
         assert(!(i5 != i4));
         assert(!(i5 != i5));
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op++/dereference.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op++/dereference.pass.cpp
index 19fb02fc4..d60302ad4 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op++/dereference.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op++/dereference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf("abc");
@@ -37,4 +36,6 @@ int main()
         ++i;
         assert(*i == L'c');
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op==/equal.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op==/equal.pass.cpp
index 65a78cb10..875989f5d 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op==/equal.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op==/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf1("abc");
@@ -99,4 +98,6 @@ int main()
         assert( (i5 == i4));
         assert( (i5 == i5));
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/post_increment.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/post_increment.pass.cpp
index 2e4f52ce7..e3121494d 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/post_increment.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/post_increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf("abc");
@@ -35,4 +34,6 @@ int main()
         assert(*i++ == L'c');
         assert(i == std::istreambuf_iterator<wchar_t>());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/pre_increment.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/pre_increment.pass.cpp
index cb7960a0e..9d05cbda3 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/pre_increment.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/pre_increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf("abc");
@@ -36,4 +35,6 @@ int main()
         assert(*++i == L'c');
         assert(++i == std::istreambuf_iterator<wchar_t>());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_proxy/proxy.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_proxy/proxy.pass.cpp
index acaf2f569..74e1813d5 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_proxy/proxy.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_proxy/proxy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream inf("abc");
@@ -41,4 +40,6 @@ int main()
         std::istreambuf_iterator<wchar_t> i(inf);
         assert(*i++ == L'a');
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/istreambuf.iterator/types.pass.cpp b/test/std/iterators/stream.iterators/istreambuf.iterator/types.pass.cpp
index c974e2cd0..a6c6435f1 100644
--- a/test/std/iterators/stream.iterators/istreambuf.iterator/types.pass.cpp
+++ b/test/std/iterators/stream.iterators/istreambuf.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::istreambuf_iterator<char> I1;
     static_assert((std::is_same<I1::iterator_category, std::input_iterator_tag>::value), "");
@@ -66,4 +65,6 @@ int main()
     static_assert((std::is_nothrow_default_constructible<I2>::value), "" );
     static_assert((std::is_trivially_copy_constructible<I2>::value), "" );
     static_assert((std::is_trivially_destructible<I2>::value), "" );
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/iterator.range/begin_array.pass.cpp b/test/std/iterators/stream.iterators/iterator.range/begin_array.pass.cpp
index 42c8c3dd9..8d7500cf2 100644
--- a/test/std/iterators/stream.iterators/iterator.range/begin_array.pass.cpp
+++ b/test/std/iterators/stream.iterators/iterator.range/begin_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,11 +13,13 @@
 #include <iterator>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int ia[] = {1, 2, 3};
     int* i = std::begin(ia);
     assert(*i == 1);
     *i = 2;
     assert(ia[0] == 2);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/iterator.range/begin_const.pass.cpp b/test/std/iterators/stream.iterators/iterator.range/begin_const.pass.cpp
index 7dca8b071..06b5e7907 100644
--- a/test/std/iterators/stream.iterators/iterator.range/begin_const.pass.cpp
+++ b/test/std/iterators/stream.iterators/iterator.range/begin_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int ia[] = {1, 2, 3};
     const std::vector<int> v(ia, ia + sizeof(ia)/sizeof(ia[0]));
     std::vector<int>::const_iterator i = begin(v);
     assert(*i == 1);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/iterator.range/begin_non_const.pass.cpp b/test/std/iterators/stream.iterators/iterator.range/begin_non_const.pass.cpp
index de4c8b0f2..75e61d3b4 100644
--- a/test/std/iterators/stream.iterators/iterator.range/begin_non_const.pass.cpp
+++ b/test/std/iterators/stream.iterators/iterator.range/begin_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int ia[] = {1, 2, 3};
     std::vector<int> v(ia, ia + sizeof(ia)/sizeof(ia[0]));
@@ -22,4 +21,6 @@ int main()
     assert(*i == 1);
     *i = 2;
     assert(*i == 2);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/iterator.range/end_array.pass.cpp b/test/std/iterators/stream.iterators/iterator.range/end_array.pass.cpp
index 628e5e901..a6721155a 100644
--- a/test/std/iterators/stream.iterators/iterator.range/end_array.pass.cpp
+++ b/test/std/iterators/stream.iterators/iterator.range/end_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,11 +13,13 @@
 #include <iterator>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int ia[] = {1, 2, 3};
     int* i = std::begin(ia);
     int* e = std::end(ia);
     assert(e == ia + 3);
     assert(e - i == 3);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/iterator.range/end_const.pass.cpp b/test/std/iterators/stream.iterators/iterator.range/end_const.pass.cpp
index 7fa26171f..78a6affd8 100644
--- a/test/std/iterators/stream.iterators/iterator.range/end_const.pass.cpp
+++ b/test/std/iterators/stream.iterators/iterator.range/end_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int ia[] = {1, 2, 3};
     const std::vector<int> v(ia, ia + sizeof(ia)/sizeof(ia[0]));
     std::vector<int>::const_iterator i = end(v);
     assert(i == v.cend());
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/iterator.range/end_non_const.pass.cpp b/test/std/iterators/stream.iterators/iterator.range/end_non_const.pass.cpp
index 8c7543363..9970ec922 100644
--- a/test/std/iterators/stream.iterators/iterator.range/end_non_const.pass.cpp
+++ b/test/std/iterators/stream.iterators/iterator.range/end_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int ia[] = {1, 2, 3};
     std::vector<int> v(ia, ia + sizeof(ia)/sizeof(ia[0]));
     std::vector<int>::iterator i = end(v);
     assert(i == v.end());
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/nothing_to_do.pass.cpp b/test/std/iterators/stream.iterators/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/iterators/stream.iterators/nothing_to_do.pass.cpp
+++ b/test/std/iterators/stream.iterators/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/copy.pass.cpp b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/copy.pass.cpp
index c1f3e5575..491f3bc1c 100644
--- a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/copy.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ostringstream outf;
     std::ostream_iterator<int> i(outf);
     std::ostream_iterator<int> j = i;
     assert(outf.good());
     ((void)j);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream.pass.cpp b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream.pass.cpp
index 6366355cc..78abcfab6 100644
--- a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ typedef std::basic_ostream<char, MyTraits> BasicStream;
 
 void operator&(BasicStream const&) {}
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -36,4 +35,6 @@ int main()
         std::ostream_iterator<int, char, MyTraits> i(outf);
         assert(outf.good());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream_delim.pass.cpp b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream_delim.pass.cpp
index 69c2dfc9b..2c48189f9 100644
--- a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream_delim.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.cons.des/ostream_delim.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ typedef std::basic_ostream<char, MyTraits> BasicStream;
 
 void operator&(BasicStream const&) {}
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -42,4 +41,6 @@ int main()
         std::ostream_iterator<int, char, MyTraits> i(outf, ", ");
         assert(outf.good());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/assign_t.pass.cpp b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/assign_t.pass.cpp
index cc451c0a2..5a2f2cc99 100644
--- a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/assign_t.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/assign_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #pragma warning(disable: 4244) // conversion from 'X' to 'Y', possible loss of data
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -53,4 +52,6 @@ int main()
         i = 2.4;
         assert(outf.str() == L"2, ");
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/dereference.pass.cpp b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/dereference.pass.cpp
index 322107528..6cb190ab4 100644
--- a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/dereference.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/dereference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ostringstream os;
     std::ostream_iterator<int> i(os);
     std::ostream_iterator<int>& iref = *i;
     assert(&iref == &i);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/increment.pass.cpp b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/increment.pass.cpp
index 00b63e8da..eedab8115 100644
--- a/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/increment.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostream.iterator/ostream.iterator.ops/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ostringstream os;
     std::ostream_iterator<int> i(os);
@@ -26,4 +25,6 @@ int main()
     assert(&iref1 == &i);
     std::ostream_iterator<int>& iref2 = i++;
     assert(&iref2 == &i);
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostream.iterator/types.pass.cpp b/test/std/iterators/stream.iterators/ostream.iterator/types.pass.cpp
index 8d043e1e6..950c7dfe8 100644
--- a/test/std/iterators/stream.iterators/ostream.iterator/types.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostream.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::ostream_iterator<double> I1;
 #if TEST_STD_VER <= 14
@@ -55,4 +54,6 @@ int main()
     static_assert((std::is_same<I2::char_type, wchar_t>::value), "");
     static_assert((std::is_same<I2::traits_type, std::char_traits<wchar_t> >::value), "");
     static_assert((std::is_same<I2::ostream_type, std::wostream>::value), "");
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/ostream.pass.cpp b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/ostream.pass.cpp
index c46cf4822..aa6031a8a 100644
--- a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/ostream.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/ostream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -29,4 +28,6 @@ int main()
         std::ostreambuf_iterator<wchar_t> i(outf);
         assert(!i.failed());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/streambuf.pass.cpp b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/streambuf.pass.cpp
index 1576b7d48..2c64dc29f 100644
--- a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/streambuf.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.cons/streambuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -29,4 +28,6 @@ int main()
         std::ostreambuf_iterator<wchar_t> i(outf.rdbuf());
         assert(!i.failed());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/assign_c.pass.cpp b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/assign_c.pass.cpp
index 91d7b6927..fe51fba1f 100644
--- a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/assign_c.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/assign_c.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -36,4 +35,6 @@ int main()
         i = L'b';
         assert(outf.str() == L"ab");
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/deref.pass.cpp b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/deref.pass.cpp
index d08616410..4904320b0 100644
--- a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/deref.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/deref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -31,4 +30,6 @@ int main()
         std::ostreambuf_iterator<wchar_t>& iref = *i;
         assert(&iref == &i);
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/failed.pass.cpp b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/failed.pass.cpp
index 64997d382..fa67513ad 100644
--- a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/failed.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/failed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct my_streambuf : public std::basic_streambuf<Char,Traits> {
     int_type sputc(char_type) { return Traits::eof(); }
     };
 
-int main()
+int main(int, char**)
 {
     {
         my_streambuf<char> buf;
@@ -40,4 +39,6 @@ int main()
         i = L'a';
         assert(i.failed());
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/increment.pass.cpp b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/increment.pass.cpp
index 7461ce163..81ae55ae7 100644
--- a/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/increment.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream outf;
@@ -36,4 +35,6 @@ int main()
         std::ostreambuf_iterator<wchar_t>& iref2 = i++;
         assert(&iref2 == &i);
     }
+
+  return 0;
 }
diff --git a/test/std/iterators/stream.iterators/ostreambuf.iterator/types.pass.cpp b/test/std/iterators/stream.iterators/ostreambuf.iterator/types.pass.cpp
index cdf748465..671a09bb7 100644
--- a/test/std/iterators/stream.iterators/ostreambuf.iterator/types.pass.cpp
+++ b/test/std/iterators/stream.iterators/ostreambuf.iterator/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::ostreambuf_iterator<char> I1;
 #if TEST_STD_VER <= 14
@@ -59,4 +58,6 @@ int main()
     static_assert((std::is_same<I2::traits_type, std::char_traits<wchar_t> >::value), "");
     static_assert((std::is_same<I2::streambuf_type, std::wstreambuf>::value), "");
     static_assert((std::is_same<I2::ostream_type, std::wostream>::value), "");
+
+  return 0;
 }
diff --git a/test/std/language.support/cmp/cmp.common/common_comparison_category.pass.cpp b/test/std/language.support/cmp/cmp.common/common_comparison_category.pass.cpp
index f146dace6..218291b6b 100644
--- a/test/std/language.support/cmp/cmp.common/common_comparison_category.pass.cpp
+++ b/test/std/language.support/cmp/cmp.common/common_comparison_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ void test_cat() {
 
 // [class.spaceship]p4: The 'common comparison type' U of a possibly-empty list
 //   of 'n' types T0, T1, ..., TN, is defined as follows:
-int main() {
+int main(int, char**) {
   using WE = std::weak_equality;
   using SE = std::strong_equality;
   using PO = std::partial_ordering;
@@ -90,4 +89,6 @@ int main() {
     test_cat<SO, SO>();
     test_cat<SO, SO, SO>();
   }
+
+  return 0;
 }
diff --git a/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp b/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp
index a80477151..f2e673db6 100644
--- a/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp
+++ b/test/std/language.support/cmp/cmp.partialord/partialord.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -130,7 +129,7 @@ constexpr bool test_constexpr() {
   };
   for (auto TC : SpaceshipTestCases)
   {
-    std::partial_ordering Res = (0 <=> TC.Value);
+    std::partial_ordering Res = (TC.Value <=> 0);
     switch (TC.Expect) {
     case ER_Equiv:
       assert(Res == 0);
@@ -156,9 +155,11 @@ constexpr bool test_constexpr() {
   return true;
 }
 
-int main() {
+int main(int, char**) {
   test_static_members();
   test_signatures();
   static_assert(test_conversion(), "conversion test failed");
   static_assert(test_constexpr(), "constexpr test failed");
+
+  return 0;
 }
diff --git a/test/std/language.support/cmp/cmp.strongeq/cmp.strongeq.pass.cpp b/test/std/language.support/cmp/cmp.strongeq/cmp.strongeq.pass.cpp
index 07fc26eed..a5af910a5 100644
--- a/test/std/language.support/cmp/cmp.strongeq/cmp.strongeq.pass.cpp
+++ b/test/std/language.support/cmp/cmp.strongeq/cmp.strongeq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -88,9 +87,11 @@ constexpr bool test_constexpr() {
   return true;
 }
 
-int main() {
+int main(int, char**) {
   test_static_members();
   test_signatures();
   test_conversion();
   static_assert(test_constexpr(), "constexpr test failed");
+
+  return 0;
 }
diff --git a/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp b/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp
index 0bdd68679..a31fd34d4 100644
--- a/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp
+++ b/test/std/language.support/cmp/cmp.strongord/strongord.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -185,7 +184,7 @@ constexpr bool test_constexpr() {
   };
   for (auto TC : SpaceshipTestCases)
   {
-    std::strong_ordering Res = (0 <=> TC.Value);
+    std::strong_ordering Res = (TC.Value <=> 0);
     switch (TC.Expect) {
     case ER_Equiv:
       assert(Res == 0);
@@ -204,9 +203,11 @@ constexpr bool test_constexpr() {
   return true;
 }
 
-int main() {
+int main(int, char**) {
   test_static_members();
   test_signatures();
   static_assert(test_conversion(), "conversion test failed");
   static_assert(test_constexpr(), "constexpr test failed");
+
+  return 0;
 }
diff --git a/test/std/language.support/cmp/cmp.weakeq/cmp.weakeq.pass.cpp b/test/std/language.support/cmp/cmp.weakeq/cmp.weakeq.pass.cpp
index 375cff460..367aac6be 100644
--- a/test/std/language.support/cmp/cmp.weakeq/cmp.weakeq.pass.cpp
+++ b/test/std/language.support/cmp/cmp.weakeq/cmp.weakeq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,8 +62,10 @@ constexpr bool test_constexpr() {
   return true;
 }
 
-int main() {
+int main(int, char**) {
   test_static_members();
   test_signatures();
   static_assert(test_constexpr(), "constexpr test failed");
+
+  return 0;
 }
diff --git a/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp b/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp
index 0a5268032..ada8d240b 100644
--- a/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp
+++ b/test/std/language.support/cmp/cmp.weakord/weakord.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -142,7 +141,7 @@ constexpr bool test_constexpr() {
   };
   for (auto TC : SpaceshipTestCases)
   {
-    std::weak_ordering Res = (0 <=> TC.Value);
+    std::weak_ordering Res = (TC.Value <=> 0);
     switch (TC.Expect) {
     case ER_Equiv:
       assert(Res == 0);
@@ -161,9 +160,11 @@ constexpr bool test_constexpr() {
   return true;
 }
 
-int main() {
+int main(int, char**) {
   test_static_members();
   test_signatures();
   static_assert(test_conversion(), "conversion test failed");
   static_assert(test_constexpr(), "constexpr test failed");
+
+  return 0;
 }
diff --git a/test/std/language.support/cstdint/cstdint.syn/cstdint.pass.cpp b/test/std/language.support/cstdint/cstdint.syn/cstdint.pass.cpp
index 20ae6e620..ec4afd7f6 100644
--- a/test/std/language.support/cstdint/cstdint.syn/cstdint.pass.cpp
+++ b/test/std/language.support/cstdint/cstdint.syn/cstdint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     // typedef std::int8_t
     static_assert(sizeof(std::int8_t)*CHAR_BIT == 8,
@@ -289,4 +288,6 @@ int main()
 #ifndef UINTMAX_C
 #error UINTMAX_C not defined
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/nothing_to_do.pass.cpp b/test/std/language.support/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/nothing_to_do.pass.cpp
+++ b/test/std/language.support/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/align_val_t.pass.cpp b/test/std/language.support/support.dynamic/align_val_t.pass.cpp
index ffb54ab4d..6e6551823 100644
--- a/test/std/language.support/support.dynamic/align_val_t.pass.cpp
+++ b/test/std/language.support/support.dynamic/align_val_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   {
     static_assert(std::is_enum<std::align_val_t>::value, "");
     static_assert(std::is_same<std::underlying_type<std::align_val_t>::type, std::size_t>::value, "");
@@ -31,4 +30,6 @@ int main() {
     static_assert(b == std::align_val_t(32), "");
     static_assert(static_cast<std::size_t>(c) == (std::size_t)-1, "");
   }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/alloc.errors/bad.alloc/bad_alloc.pass.cpp b/test/std/language.support/support.dynamic/alloc.errors/bad.alloc/bad_alloc.pass.cpp
index cf8d4af93..f0b2bd21f 100644
--- a/test/std/language.support/support.dynamic/alloc.errors/bad.alloc/bad_alloc.pass.cpp
+++ b/test/std/language.support/support.dynamic/alloc.errors/bad.alloc/bad_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::bad_alloc>::value),
                  "std::is_base_of<std::exception, std::bad_alloc>::value");
@@ -24,4 +23,6 @@ int main()
     b2 = b;
     const char* w = b2.what();
     assert(w);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/alloc.errors/new.badlength/bad_array_new_length.pass.cpp b/test/std/language.support/support.dynamic/alloc.errors/new.badlength/bad_array_new_length.pass.cpp
index 50521c000..35fd13041 100644
--- a/test/std/language.support/support.dynamic/alloc.errors/new.badlength/bad_array_new_length.pass.cpp
+++ b/test/std/language.support/support.dynamic/alloc.errors/new.badlength/bad_array_new_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::bad_alloc, std::bad_array_new_length>::value),
                   "std::is_base_of<std::bad_alloc, std::bad_array_new_length>::value");
@@ -24,4 +23,6 @@ int main()
     b2 = b;
     const char* w = b2.what();
     assert(w);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/alloc.errors/new.handler/new_handler.pass.cpp b/test/std/language.support/support.dynamic/alloc.errors/new.handler/new_handler.pass.cpp
index 0d4524cac..b69fe1523 100644
--- a/test/std/language.support/support.dynamic/alloc.errors/new.handler/new_handler.pass.cpp
+++ b/test/std/language.support/support.dynamic/alloc.errors/new.handler/new_handler.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::new_handler, void(*)()>::value), "");
     std::new_handler p = f;
     assert(p == &f);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/alloc.errors/nothing_to_do.pass.cpp b/test/std/language.support/support.dynamic/alloc.errors/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/support.dynamic/alloc.errors/nothing_to_do.pass.cpp
+++ b/test/std/language.support/support.dynamic/alloc.errors/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/get_new_handler.pass.cpp b/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/get_new_handler.pass.cpp
index 55a3edabf..a9ed3b0cf 100644
--- a/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/get_new_handler.pass.cpp
+++ b/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/get_new_handler.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 void f1() {}
 void f2() {}
 
-int main()
+int main(int, char**)
 {
     assert(std::get_new_handler() == 0);
     std::set_new_handler(f1);
     assert(std::get_new_handler() == f1);
     std::set_new_handler(f2);
     assert(std::get_new_handler() == f2);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/set_new_handler.pass.cpp b/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/set_new_handler.pass.cpp
index 349bf440e..cff382b0e 100644
--- a/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/set_new_handler.pass.cpp
+++ b/test/std/language.support/support.dynamic/alloc.errors/set.new.handler/set_new_handler.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 void f1() {}
 void f2() {}
 
-int main()
+int main(int, char**)
 {
     assert(std::set_new_handler(f1) == 0);
     assert(std::set_new_handler(f2) == f1);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp
index 4dd9390c4..0a5265861 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/delete_align_val_t_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,9 +16,11 @@
 // None of the current GCC compilers support this.
 // UNSUPPORTED: gcc-5, gcc-6
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13.
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -82,7 +83,7 @@ void operator delete [] (void* p, std::align_val_t) TEST_NOEXCEPT
 struct alignas(OverAligned) A {};
 struct alignas(std::max_align_t) B {};
 
-int main()
+int main(int, char**)
 {
     reset();
     {
@@ -112,4 +113,6 @@ int main()
         assert(0 == unsized_delete_nothrow_called);
         assert(1 == aligned_delete_called);
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
index d6194b00a..e303c8208 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 // FIXME change this to XFAIL.
 // UNSUPPORTED: no-aligned-allocation && !gcc
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13.
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -89,7 +90,7 @@ void test_throw_max_size() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new A[2];
@@ -102,4 +103,6 @@ int main()
     {
         test_throw_max_size();
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
index 59878aefd..ed7a53743 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 // FIXME turn this into an XFAIL
 // UNSUPPORTED: no-aligned-allocation && !gcc
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13.
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -91,7 +92,7 @@ void test_max_alloc() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new(std::nothrow) A[3];
@@ -104,4 +105,6 @@ int main()
     {
         test_max_alloc();
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
index fc713dbf8..49aa2bce3 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_nothrow_replace.pass.cpp
@@ -1,18 +1,19 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // UNSUPPORTED: sanitizer-new-delete
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13.
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -85,7 +86,7 @@ void  operator delete[](void* p, std::align_val_t a) TEST_NOEXCEPT
     --new_called;
 }
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new (std::nothrow) A[2];
@@ -105,4 +106,6 @@ int main()
         assert(!new_called);
         assert(!B_constructed);
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_replace.pass.cpp
index d8e08a3a0..cb9a2ef7f 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_align_val_t_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ void  operator delete[](void* p, std::align_val_t) TEST_NOEXCEPT
 }
 
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new A[3];
@@ -86,4 +85,6 @@ int main()
         delete [] bp;
         assert(!new_called);
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array.pass.cpp
index 58ff728e6..55dc5c753 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct A
     ~A() {--A_constructed;}
 };
 
-int main()
+int main(int, char**)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     std::set_new_handler(my_new_handler);
@@ -61,4 +60,6 @@ int main()
     delete [] ap;
     DoNotOptimize(ap);
     assert(A_constructed == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow.pass.cpp
index f29f0c09e..b4d8aa349 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct A
     ~A() {--A_constructed;}
 };
 
-int main()
+int main(int, char**)
 {
     std::set_new_handler(my_new_handler);
 #ifndef TEST_HAS_NO_EXCEPTIONS
@@ -60,4 +59,6 @@ int main()
     delete [] ap;
     DoNotOptimize(ap);
     assert(A_constructed == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow_replace.pass.cpp
index 3d8467faa..4d90aa9a3 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct A
     ~A() {--A_constructed;}
 };
 
-int main()
+int main(int, char**)
 {
     A *ap = new (std::nothrow) A[3];
     DoNotOptimize(ap);
@@ -55,4 +54,6 @@ int main()
     DoNotOptimize(ap);
     assert(A_constructed == 0);
     assert(!new_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_replace.pass.cpp
index ad4d9f469..e705fc3b4 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_array_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct A
     ~A() {--A_constructed;}
 };
 
-int main()
+int main(int, char**)
 {
     A *ap = new A[3];
     DoNotOptimize(ap);
@@ -56,4 +55,6 @@ int main()
     DoNotOptimize(ap);
     assert(A_constructed == 0);
     assert(new_called == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.sh.cpp
index 40632a1bd..a04ceb6ad 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <new>
 
-int main ()
+int main(int, char**)
 {
     ::operator new[](4);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.sh.cpp
index f7921d2f2..e2a61591a 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <new>
 
-int main ()
+int main(int, char**)
 {
     ::operator new[](4, std::align_val_t{4});  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.sh.cpp
index 130148786..5ad81863d 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_align_nothrow.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <new>
 
-int main ()
+int main(int, char**)
 {
     ::operator new[](4, std::align_val_t{4}, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.sh.cpp
index 43295a7e6..53af2c764 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/new_size_nothrow.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <new>
 
-int main ()
+int main(int, char**)
 {
     ::operator new[](4, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array11.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array11.pass.cpp
index ef9ec2db9..e1a545cc9 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array11.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array11.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ void operator delete[](void* p, std::size_t) TEST_NOEXCEPT
 //   selected.
 struct A { ~A() {} };
 
-int main()
+int main(int, char**)
 {
 
     A* x = new A[3];
@@ -67,4 +66,6 @@ int main()
     assert(1 == unsized_delete_called);
     assert(0 == sized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
index d0b740545..d69c28be7 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ void operator delete[](void* p, std::size_t) TEST_NOEXCEPT
 //   selected.
 struct A { ~A() {} };
 
-int main()
+int main(int, char**)
 {
     A* x = new A[3];
     assert(0 == unsized_delete_called);
@@ -71,4 +70,6 @@ int main()
     assert(0 == unsized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
     assert(1 == sized_delete_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_calls_unsized_delete_array.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_calls_unsized_delete_array.pass.cpp
index a988b803d..026250dae 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_calls_unsized_delete_array.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_calls_unsized_delete_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void operator delete[](void* p, const std::nothrow_t&) TEST_NOEXCEPT
 //   selected.
 struct A { ~A() {} };
 
-int main()
+int main(int, char**)
 {
     A *x = new A[3];
     DoNotOptimize(x);
@@ -57,4 +56,6 @@ int main()
     DoNotOptimize(x);
     assert(1 == delete_called);
     assert(0 == delete_nothrow_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp
index ab25a9be0..41739c0cc 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_fsizeddeallocation.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,7 +73,7 @@ void operator delete[](void* p, std::size_t) TEST_NOEXCEPT
 //   selected.
 struct A { ~A() {} };
 
-int main()
+int main(int, char**)
 {
     A* x = new A[3];
     assert(0 == unsized_delete_called);
@@ -85,4 +84,6 @@ int main()
     assert(0 == unsized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
     assert(1 == sized_delete_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.dataraces/not_testable.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.dataraces/not_testable.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.dataraces/not_testable.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.dataraces/not_testable.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new.pass.cpp
index ad306e06c..8256b9318 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,11 +19,13 @@ struct A
     ~A() {--A_constructed;}
 };
 
-int main()
+int main(int, char**)
 {
     char buf[sizeof(A)];
 
     A* ap = new(buf) A;
     assert((char*)ap == buf);
     assert(A_constructed == 1);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array.pass.cpp
index 462d1973c..8a78df6bf 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@ struct A
     ~A() {--A_constructed;}
 };
 
-int main()
+int main(int, char**)
 {
     const std::size_t Size = 3;
     // placement new might require additional space.
@@ -31,4 +30,6 @@ int main()
     assert((char*)ap >= buf);
     assert((char*)ap < (buf + ExtraSize));
     assert(A_constructed == Size);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.fail.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.fail.cpp
index 61172fb5a..4cba717db 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.fail.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array_ptr.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     char buffer[100];
     ::operator new[](4, buffer);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.fail.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.fail.cpp
index def8839c4..05a9b244c 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.fail.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_ptr.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     char buffer[100];
     ::operator new(4, buffer);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp
index 19cabcce1..22abcba05 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/delete_align_val_t_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 // None of the current GCC compilers support this.
 // UNSUPPORTED: gcc-5, gcc-6
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -81,7 +82,7 @@ void operator delete(void* p, std::align_val_t) TEST_NOEXCEPT
 struct alignas(OverAligned) A {};
 struct alignas(std::max_align_t) B {};
 
-int main()
+int main(int, char**)
 {
     reset();
     {
@@ -111,4 +112,6 @@ int main()
         assert(0 == unsized_delete_nothrow_called);
         assert(1 == aligned_delete_called);
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.pass.cpp
index df002c60a..448da1717 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct A
     ~A() {A_constructed = false;}
 };
 
-int main()
+int main(int, char**)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     std::set_new_handler(my_new_handler);
@@ -59,4 +58,6 @@ int main()
     assert(A_constructed);
     delete ap;
     assert(!A_constructed);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
index 7cf1aca3b..0d96db5de 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t.pass.cpp
@@ -1,17 +1,18 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13.
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -89,7 +90,7 @@ void test_throw_max_size() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new A;
@@ -102,4 +103,6 @@ int main()
     {
         test_throw_max_size();
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
index dd2666e00..4b621f78a 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow.pass.cpp
@@ -1,17 +1,18 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -91,7 +92,7 @@ void test_max_alloc() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new(std::nothrow) A;
@@ -104,4 +105,6 @@ int main()
     {
         test_max_alloc();
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
index 514a2b8af..892eac205 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_nothrow_replace.pass.cpp
@@ -1,18 +1,19 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // UNSUPPORTED: sanitizer-new-delete
 
-// Aligned allocation was not provided before macosx10.12 and as a result we
-// get availability errors when the deployment target is older than macosx10.13.
-// However, AppleClang 10 (and older) don't trigger availability errors.
+// Aligned allocation was not provided before macosx10.14 and as a result we
+// get availability errors when the deployment target is older than macosx10.14.
+// However, AppleClang 10 (and older) don't trigger availability errors, and
+// Clang < 8.0 doesn't warn for 10.13
+// XFAIL: !(apple-clang-9 || apple-clang-10 || clang-7) && availability=macosx10.13
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.12
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.11
 // XFAIL: !(apple-clang-9 || apple-clang-10) && availability=macosx10.10
@@ -87,7 +88,7 @@ void  operator delete(void* p, std::align_val_t a) TEST_NOEXCEPT
 }
 
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new (std::nothrow) A;
@@ -107,4 +108,6 @@ int main()
         assert(!new_called);
         assert(!B_constructed);
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_replace.pass.cpp
index 2dd4631e7..32c27d589 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_align_val_t_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ void  operator delete(void* p, std::align_val_t) TEST_NOEXCEPT
 }
 
 
-int main()
+int main(int, char**)
 {
     {
         A* ap = new A;
@@ -86,4 +85,6 @@ int main()
         delete bp;
         assert(!new_called);
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow.pass.cpp
index d85db6c49..dfdf7d77e 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct A
     ~A() {A_constructed = false;}
 };
 
-int main()
+int main(int, char**)
 {
     std::set_new_handler(my_new_handler);
 #ifndef TEST_HAS_NO_EXCEPTIONS
@@ -57,4 +56,6 @@ int main()
     assert(A_constructed);
     delete ap;
     assert(!A_constructed);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow_replace.pass.cpp
index a0e3eda57..1f186d8b3 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_nothrow_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct A
     ~A() {A_constructed = false;}
 };
 
-int main()
+int main(int, char**)
 {
     A *ap = new (std::nothrow) A;
     DoNotOptimize(ap);
@@ -55,4 +54,6 @@ int main()
     DoNotOptimize(ap);
     assert(!A_constructed);
     assert(!new_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_replace.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_replace.pass.cpp
index aa00fee56..4854c2fb7 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_replace.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_replace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ struct A
     ~A() {A_constructed = false;}
 };
 
-int main()
+int main(int, char**)
 {
     A *ap = new A;
     DoNotOptimize(ap);
@@ -54,4 +53,6 @@ int main()
     DoNotOptimize(ap);
     assert(!A_constructed);
     assert(!new_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.fail.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.fail.cpp
index 865cb1ee8..4769933d3 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.fail.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     ::operator new(4);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.sh.cpp
index 410c6d774..a0d99c76d 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <new>
 
-int main ()
+int main(int, char**)
 {
     ::operator new(4, std::align_val_t{4});  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.sh.cpp
index 1fe104551..54b25ac55 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_align_nothrow.sh.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <new>
 
-int main ()
+int main(int, char**)
 {
     ::operator new(4, std::align_val_t{4}, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.fail.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.fail.cpp
index 39392691e..a0bfa8b7f 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.fail.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/new_size_nothrow.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     ::operator new(4, std::nothrow);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete11.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete11.pass.cpp
index d9e0f5ca3..69f8bce27 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete11.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete11.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ void operator delete(void* p, std::size_t) TEST_NOEXCEPT
     std::free(p);
 }
 
-int main()
+int main(int, char**)
 {
     int *x = new int(42);
     DoNotOptimize(x);
@@ -57,4 +56,6 @@ int main()
     assert(1 == unsized_delete_called);
     assert(0 == sized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
index 5b08eb4b8..deb17d1ae 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void operator delete(void* p, std::size_t) TEST_NOEXCEPT
     std::free(p);
 }
 
-int main()
+int main(int, char**)
 {
     int *x = new int(42);
     DoNotOptimize(x);
@@ -62,4 +61,6 @@ int main()
     assert(0 == unsized_delete_called);
     assert(1 == sized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_calls_unsized_delete.pass.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_calls_unsized_delete.pass.cpp
index 178e26db1..fbc9cf070 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_calls_unsized_delete.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_calls_unsized_delete.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ void operator delete(void* p, const std::nothrow_t&) TEST_NOEXCEPT
     std::free(p);
 }
 
-int main()
+int main(int, char**)
 {
     int *x = new int(42);
     DoNotOptimize(x);
@@ -46,4 +45,6 @@ int main()
     DoNotOptimize(x);
     assert(1 == delete_called);
     assert(0 == delete_nothrow_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp
index 7d6f34845..3d62040cb 100644
--- a/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ void operator delete(void* p, std::size_t) TEST_NOEXCEPT
     std::free(p);
 }
 
-int main()
+int main(int, char**)
 {
     int *x = new int(42);
     DoNotOptimize(x);
@@ -75,4 +74,6 @@ int main()
     assert(1 == sized_delete_called);
     assert(0 == unsized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/new.delete/nothing_to_do.pass.cpp b/test/std/language.support/support.dynamic/new.delete/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/support.dynamic/new.delete/nothing_to_do.pass.cpp
+++ b/test/std/language.support/support.dynamic/new.delete/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.fail.cpp b/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.fail.cpp
index 1c75e561d..e7252395d 100644
--- a/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.fail.cpp
+++ b/test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,8 +19,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     int *p = nullptr;
     std::launder(p);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/ptr.launder/launder.pass.cpp b/test/std/language.support/support.dynamic/ptr.launder/launder.pass.cpp
index 457696a42..f9d4da371 100644
--- a/test/std/language.support/support.dynamic/ptr.launder/launder.pass.cpp
+++ b/test/std/language.support/support.dynamic/ptr.launder/launder.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 constexpr int gi = 5;
 constexpr float gf = 8.f;
 
-int main() {
+int main(int, char**) {
     static_assert(std::launder(&gi) == &gi, "" );
     static_assert(std::launder(&gf) == &gf, "" );
 
@@ -32,4 +31,6 @@ int main() {
 
     assert(std::launder(i) == i);
     assert(std::launder(f) == f);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.dynamic/ptr.launder/launder.types.fail.cpp b/test/std/language.support/support.dynamic/ptr.launder/launder.types.fail.cpp
index 034c578bb..d97d00194 100644
--- a/test/std/language.support/support.dynamic/ptr.launder/launder.types.fail.cpp
+++ b/test/std/language.support/support.dynamic/ptr.launder/launder.types.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 void foo() {}
 
-int main ()
+int main(int, char**)
 {
     void *p = nullptr;
     (void) std::launder((               void *) nullptr);
@@ -33,4 +32,6 @@ int main ()
 
     (void) std::launder(foo);                              // expected-error-re@new:* 1 {{static_assert failed{{.*}} "can't launder functions"}}
     // expected-error@new:* 0-1 {{function pointer argument to '__builtin_launder' is not allowed}}
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/bad.exception/bad_exception.pass.cpp b/test/std/language.support/support.exception/bad.exception/bad_exception.pass.cpp
index 3baddaa89..e5f4fbe6d 100644
--- a/test/std/language.support/support.exception/bad.exception/bad_exception.pass.cpp
+++ b/test/std/language.support/support.exception/bad.exception/bad_exception.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::bad_exception>::value),
                  "std::is_base_of<std::exception, std::bad_exception>::value");
@@ -24,4 +23,6 @@ int main()
     b2 = b;
     const char* w = b2.what();
     assert(w);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/except.nested/assign.pass.cpp b/test/std/language.support/support.exception/except.nested/assign.pass.cpp
index 6338c8aaa..972649579 100644
--- a/test/std/language.support/support.exception/except.nested/assign.pass.cpp
+++ b/test/std/language.support/support.exception/except.nested/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ public:
     friend bool operator==(const A& x, const A& y) {return x.data_ == y.data_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::nested_exception e0;
@@ -60,4 +59,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/except.nested/ctor_copy.pass.cpp b/test/std/language.support/support.exception/except.nested/ctor_copy.pass.cpp
index 4cbdbb2ec..9d65f5fb2 100644
--- a/test/std/language.support/support.exception/except.nested/ctor_copy.pass.cpp
+++ b/test/std/language.support/support.exception/except.nested/ctor_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ public:
     friend bool operator==(const A& x, const A& y) {return x.data_ == y.data_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::nested_exception e0;
@@ -58,4 +57,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/except.nested/ctor_default.pass.cpp b/test/std/language.support/support.exception/except.nested/ctor_default.pass.cpp
index 18ca9968f..a96c3d015 100644
--- a/test/std/language.support/support.exception/except.nested/ctor_default.pass.cpp
+++ b/test/std/language.support/support.exception/except.nested/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ public:
     friend bool operator==(const A& x, const A& y) {return x.data_ == y.data_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::nested_exception e;
@@ -56,4 +55,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/except.nested/rethrow_if_nested.pass.cpp b/test/std/language.support/support.exception/except.nested/rethrow_if_nested.pass.cpp
index 43a11bab3..01ef7ade7 100644
--- a/test/std/language.support/support.exception/except.nested/rethrow_if_nested.pass.cpp
+++ b/test/std/language.support/support.exception/except.nested/rethrow_if_nested.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ class E1 : public std::nested_exception {};
 class E2 : public std::nested_exception {};
 class E : public E1, public E2 {};
 
-int main()
+int main(int, char**)
 {
     {
         try
@@ -132,4 +131,6 @@ int main()
         }
     }
 
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/except.nested/rethrow_nested.pass.cpp b/test/std/language.support/support.exception/except.nested/rethrow_nested.pass.cpp
index d511a72f9..204c3b567 100644
--- a/test/std/language.support/support.exception/except.nested/rethrow_nested.pass.cpp
+++ b/test/std/language.support/support.exception/except.nested/rethrow_nested.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void go_quietly()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     {
         try
@@ -68,4 +67,6 @@ int main()
             assert(false);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp b/test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp
index 6a9f25cd0..b63053c33 100644
--- a/test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp
+++ b/test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ public:
 struct Final final {};
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         try
@@ -129,4 +128,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/exception.terminate/nothing_to_do.pass.cpp b/test/std/language.support/support.exception/exception.terminate/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/support.exception/exception.terminate/nothing_to_do.pass.cpp
+++ b/test/std/language.support/support.exception/exception.terminate/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/exception.terminate/set.terminate/get_terminate.pass.cpp b/test/std/language.support/support.exception/exception.terminate/set.terminate/get_terminate.pass.cpp
index 82ae4aaa8..851d93bc0 100644
--- a/test/std/language.support/support.exception/exception.terminate/set.terminate/get_terminate.pass.cpp
+++ b/test/std/language.support/support.exception/exception.terminate/set.terminate/get_terminate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 void f1() {}
 void f2() {}
 
-int main()
+int main(int, char**)
 {
     std::set_terminate(f1);
     assert(std::get_terminate() == f1);
     std::set_terminate(f2);
     assert(std::get_terminate() == f2);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/exception.terminate/set.terminate/set_terminate.pass.cpp b/test/std/language.support/support.exception/exception.terminate/set.terminate/set_terminate.pass.cpp
index c4bff603e..e4464b9af 100644
--- a/test/std/language.support/support.exception/exception.terminate/set.terminate/set_terminate.pass.cpp
+++ b/test/std/language.support/support.exception/exception.terminate/set.terminate/set_terminate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 void f1() {}
 void f2() {}
 
-int main()
+int main(int, char**)
 {
     std::set_terminate(f1);
     assert(std::set_terminate(f2) == f1);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/exception.terminate/terminate.handler/terminate_handler.pass.cpp b/test/std/language.support/support.exception/exception.terminate/terminate.handler/terminate_handler.pass.cpp
index e477f5298..2519f0bc9 100644
--- a/test/std/language.support/support.exception/exception.terminate/terminate.handler/terminate_handler.pass.cpp
+++ b/test/std/language.support/support.exception/exception.terminate/terminate.handler/terminate_handler.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::terminate_handler, void(*)()>::value), "");
     std::terminate_handler p = f;
     assert(p == &f);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/exception.terminate/terminate/terminate.pass.cpp b/test/std/language.support/support.exception/exception.terminate/terminate/terminate.pass.cpp
index 3199d9b9e..4243fb5ca 100644
--- a/test/std/language.support/support.exception/exception.terminate/terminate/terminate.pass.cpp
+++ b/test/std/language.support/support.exception/exception.terminate/terminate/terminate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@ void f1()
     std::exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     std::set_terminate(f1);
     std::terminate();
     assert(false);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/exception/exception.pass.cpp b/test/std/language.support/support.exception/exception/exception.pass.cpp
index ad53b6ebf..893a7d5b3 100644
--- a/test/std/language.support/support.exception/exception/exception.pass.cpp
+++ b/test/std/language.support/support.exception/exception/exception.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_polymorphic<std::exception>::value,
                  "std::is_polymorphic<std::exception>::value");
@@ -22,4 +21,6 @@ int main()
     b2 = b;
     const char* w = b2.what();
     assert(w);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/propagation/current_exception.pass.cpp b/test/std/language.support/support.exception/propagation/current_exception.pass.cpp
index c33d64d06..c95368163 100644
--- a/test/std/language.support/support.exception/propagation/current_exception.pass.cpp
+++ b/test/std/language.support/support.exception/propagation/current_exception.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct A
 
 int A::constructed = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::exception_ptr p = std::current_exception();
@@ -271,4 +270,6 @@ int main()
         assert(p != nullptr);
     }
     assert(A::constructed == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/propagation/exception_ptr.pass.cpp b/test/std/language.support/support.exception/propagation/exception_ptr.pass.cpp
index 3aa8dcf55..164e7774b 100644
--- a/test/std/language.support/support.exception/propagation/exception_ptr.pass.cpp
+++ b/test/std/language.support/support.exception/propagation/exception_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <exception>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::exception_ptr p;
     assert(p == nullptr);
@@ -31,4 +30,6 @@ int main()
     assert(p3 == nullptr);
     p3 = nullptr;
     assert(p3 == nullptr);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/propagation/make_exception_ptr.pass.cpp b/test/std/language.support/support.exception/propagation/make_exception_ptr.pass.cpp
index 35821d9bd..b26212fd1 100644
--- a/test/std/language.support/support.exception/propagation/make_exception_ptr.pass.cpp
+++ b/test/std/language.support/support.exception/propagation/make_exception_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::constructed = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::exception_ptr p = std::make_exception_ptr(A(5));
@@ -53,4 +52,6 @@ int main()
         assert(A::constructed == 0);
     }
     assert(A::constructed == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/propagation/rethrow_exception.pass.cpp b/test/std/language.support/support.exception/propagation/rethrow_exception.pass.cpp
index 37ffb5be5..015dbef22 100644
--- a/test/std/language.support/support.exception/propagation/rethrow_exception.pass.cpp
+++ b/test/std/language.support/support.exception/propagation/rethrow_exception.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::constructed = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::exception_ptr p;
@@ -61,4 +60,6 @@ int main()
         assert(A::constructed == 0);
     }
     assert(A::constructed == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/uncaught/uncaught_exception.pass.cpp b/test/std/language.support/support.exception/uncaught/uncaught_exception.pass.cpp
index a4353be4f..61cfc8f11 100644
--- a/test/std/language.support/support.exception/uncaught/uncaught_exception.pass.cpp
+++ b/test/std/language.support/support.exception/uncaught/uncaught_exception.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct B
     }
 };
 
-int main()
+int main(int, char**)
 {
     try
     {
@@ -43,4 +42,6 @@ int main()
         assert(!std::uncaught_exception());
     }
     assert(!std::uncaught_exception());
+
+  return 0;
 }
diff --git a/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp b/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp
index 859d831a3..c25e4d2e0 100644
--- a/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp
+++ b/test/std/language.support/support.exception/uncaught/uncaught_exceptions.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ struct Outer {
     int d_;
 };
 
-int main () {
+int main(int, char**) {
     assert(std::uncaught_exceptions() == 0);
     {
     Outer o(0);
@@ -59,4 +58,6 @@ int main () {
         }
     }
     assert(std::uncaught_exceptions() == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.general/nothing_to_do.pass.cpp b/test/std/language.support/support.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/support.general/nothing_to_do.pass.cpp
+++ b/test/std/language.support/support.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.initlist/include_cxx03.pass.cpp b/test/std/language.support/support.initlist/include_cxx03.pass.cpp
index 8710ddcdd..282636ed0 100644
--- a/test/std/language.support/support.initlist/include_cxx03.pass.cpp
+++ b/test/std/language.support/support.initlist/include_cxx03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,6 +12,8 @@
 
 #include <initializer_list>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.initlist/support.initlist.access/access.pass.cpp b/test/std/language.support/support.initlist/support.initlist.access/access.pass.cpp
index cadae24cb..097f21a5c 100644
--- a/test/std/language.support/support.initlist/support.initlist.access/access.pass.cpp
+++ b/test/std/language.support/support.initlist/support.initlist.access/access.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,11 +51,13 @@ struct B
 
 #endif  // TEST_STD_VER > 11
 
-int main()
+int main(int, char**)
 {
     A test1 = {3, 2, 1};
 #if TEST_STD_VER > 11
     constexpr B test2 = {3, 2, 1};
     (void)test2;
 #endif  // TEST_STD_VER > 11
+
+  return 0;
 }
diff --git a/test/std/language.support/support.initlist/support.initlist.cons/default.pass.cpp b/test/std/language.support/support.initlist/support.initlist.cons/default.pass.cpp
index 2d831c9e1..8d2e0a7e7 100644
--- a/test/std/language.support/support.initlist/support.initlist.cons/default.pass.cpp
+++ b/test/std/language.support/support.initlist/support.initlist.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     std::initializer_list<A> il;
     assert(il.size() == 0);
@@ -29,4 +28,6 @@ int main()
     constexpr std::initializer_list<A> il2;
     static_assert(il2.size() == 0, "");
 #endif  // TEST_STD_VER > 11
+
+  return 0;
 }
diff --git a/test/std/language.support/support.initlist/support.initlist.range/begin_end.pass.cpp b/test/std/language.support/support.initlist/support.initlist.range/begin_end.pass.cpp
index abb07dc99..ec755bfeb 100644
--- a/test/std/language.support/support.initlist/support.initlist.range/begin_end.pass.cpp
+++ b/test/std/language.support/support.initlist/support.initlist.range/begin_end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,11 +49,13 @@ struct B
 
 #endif  // TEST_STD_VER > 11
 
-int main()
+int main(int, char**)
 {
     A test1 = {3, 2, 1};
 #if TEST_STD_VER > 11
     constexpr B test2 = {3, 2, 1};
     (void)test2;
 #endif  // TEST_STD_VER > 11
+
+  return 0;
 }
diff --git a/test/std/language.support/support.initlist/types.pass.cpp b/test/std/language.support/support.initlist/types.pass.cpp
index a301ef924..1b48980a2 100644
--- a/test/std/language.support/support.initlist/types.pass.cpp
+++ b/test/std/language.support/support.initlist/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::initializer_list<A>::value_type, A>::value), "");
     static_assert((std::is_same<std::initializer_list<A>::reference, const A&>::value), "");
@@ -34,4 +33,6 @@ int main()
     static_assert((std::is_same<std::initializer_list<A>::size_type, std::size_t>::value), "");
     static_assert((std::is_same<std::initializer_list<A>::iterator, const A*>::value), "");
     static_assert((std::is_same<std::initializer_list<A>::const_iterator, const A*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp b/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp
index c1e5be91e..12b80adf0 100644
--- a/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp
+++ b/test/std/language.support/support.limits/c.limits/cfloat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -179,6 +178,8 @@
 #endif
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/c.limits/climits.pass.cpp b/test/std/language.support/support.limits/c.limits/climits.pass.cpp
index 5e31b494b..d124f7ca2 100644
--- a/test/std/language.support/support.limits/c.limits/climits.pass.cpp
+++ b/test/std/language.support/support.limits/c.limits/climits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -87,6 +86,8 @@
 #error ULLONG_MAX not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/denorm.style/check_values.pass.cpp b/test/std/language.support/support.limits/limits/denorm.style/check_values.pass.cpp
index c6731fcc8..adbd102dc 100644
--- a/test/std/language.support/support.limits/limits/denorm.style/check_values.pass.cpp
+++ b/test/std/language.support/support.limits/limits/denorm.style/check_values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@ struct two {one _[2];};
 one test(std::float_round_style);
 two test(int);
 
-int main()
+int main(int, char**)
 {
     static_assert(std::round_indeterminate == -1,
                  "std::round_indeterminate == -1");
@@ -35,4 +34,6 @@ int main()
                  "sizeof(test(std::round_to_nearest)) == 1");
     static_assert(sizeof(test(1)) == 2,
                  "sizeof(test(1)) == 2");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/is_specialized.pass.cpp b/test/std/language.support/support.limits/limits/is_specialized.pass.cpp
index ff5c1a2c0..b836555af 100644
--- a/test/std/language.support/support.limits/limits/is_specialized.pass.cpp
+++ b/test/std/language.support/support.limits/limits/is_specialized.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test()
                  "std::numeric_limits<const volatile T>::is_specialized");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>();
     test<char>();
@@ -68,4 +67,6 @@ int main()
     test<long double>();
     static_assert(!std::numeric_limits<std::complex<double> >::is_specialized,
                  "!std::numeric_limits<std::complex<double> >::is_specialized");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/const_data_members.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/const_data_members.pass.cpp
index 11772f67d..b5912130a 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/const_data_members.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/const_data_members.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,7 +68,7 @@ void test(const T &) {}
 
 struct other {};
 
-int main()
+int main(int, char**)
 {
     // bool
     TEST_NUMERIC_LIMITS(bool)
@@ -206,4 +205,6 @@ int main()
     TEST_NUMERIC_LIMITS(const other)
     TEST_NUMERIC_LIMITS(volatile other)
     TEST_NUMERIC_LIMITS(const volatile other)
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/denorm_min.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/denorm_min.pass.cpp
index 8a3ca008d..4f9f62873 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/denorm_min.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/denorm_min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(T expected)
     assert(std::numeric_limits<const volatile T>::denorm_min() == expected);
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>(false);
     test<char>(0);
@@ -66,4 +65,6 @@ int main()
 #if !defined(__FLT_DENORM_MIN__) && !defined(FLT_TRUE_MIN)
 #error Test has no expected values for floating point types
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/digits.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/digits.pass.cpp
index 7dec03d08..139f4821d 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/digits.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/digits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::digits == expected, "digits test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 1>();
     test<char, std::numeric_limits<char>::is_signed ? 7 : 8>();
@@ -55,4 +54,6 @@ int main()
     test<float, FLT_MANT_DIG>();
     test<double, DBL_MANT_DIG>();
     test<long double, LDBL_MANT_DIG>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/digits10.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/digits10.pass.cpp
index 017f8630a..efdfd70d7 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/digits10.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/digits10.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::is_bounded, "digits10 test 8");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 0>();
     test<char, 2>();
@@ -59,4 +58,6 @@ int main()
     test<float, FLT_DIG>();
     test<double, DBL_DIG>();
     test<long double, LDBL_DIG>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/epsilon.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/epsilon.pass.cpp
index b27f5c583..60a905f79 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/epsilon.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/epsilon.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(T expected)
     assert(std::numeric_limits<const volatile T>::epsilon() == expected);
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>(false);
     test<char>(0);
@@ -56,4 +55,6 @@ int main()
     test<float>(FLT_EPSILON);
     test<double>(DBL_EPSILON);
     test<long double>(LDBL_EPSILON);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm.pass.cpp
index 5096ad211..d5380c1a7 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::has_denorm == expected, "has_denorm test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, std::denorm_absent>();
     test<char, std::denorm_absent>();
@@ -54,4 +53,6 @@ int main()
     test<float, std::denorm_present>();
     test<double, std::denorm_present>();
     test<long double, std::denorm_present>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm_loss.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm_loss.pass.cpp
index 1b087f0cd..77e5de6ab 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm_loss.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/has_denorm_loss.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::has_denorm_loss == expected, "has_denorm_loss test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, false>();
@@ -54,4 +53,6 @@ int main()
     test<float, false>();
     test<double, false>();
     test<long double, false>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/has_infinity.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/has_infinity.pass.cpp
index 1391f2096..19d4fe293 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/has_infinity.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/has_infinity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::has_infinity == expected, "has_infinity test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, false>();
@@ -54,4 +53,6 @@ int main()
     test<float, true>();
     test<double, true>();
     test<long double, true>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/has_quiet_NaN.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/has_quiet_NaN.pass.cpp
index cb5736f5c..767df5ac2 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/has_quiet_NaN.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/has_quiet_NaN.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::has_quiet_NaN == expected, "has_quiet_NaN test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, false>();
@@ -54,4 +53,6 @@ int main()
     test<float, true>();
     test<double, true>();
     test<long double, true>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/has_signaling_NaN.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/has_signaling_NaN.pass.cpp
index 4f43a6532..0908c49bc 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/has_signaling_NaN.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/has_signaling_NaN.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::has_signaling_NaN == expected, "has_signaling_NaN test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, false>();
@@ -54,4 +53,6 @@ int main()
     test<float, true>();
     test<double, true>();
     test<long double, true>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/infinity.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/infinity.pass.cpp
index 241f9cc27..0004e4e62 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/infinity.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/infinity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(T expected)
 
 extern float zero;
 
-int main()
+int main(int, char**)
 {
     test<bool>(false);
     test<char>(0);
@@ -58,6 +57,8 @@ int main()
     test<float>(1.f/zero);
     test<double>(1./zero);
     test<long double>(1./zero);
+
+  return 0;
 }
 
 float zero = 0;
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/is_bounded.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/is_bounded.pass.cpp
index e00afa900..d509be720 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/is_bounded.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/is_bounded.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::is_bounded == expected, "is_bounded test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, true>();
     test<char, true>();
@@ -54,4 +53,6 @@ int main()
     test<float, true>();
     test<double, true>();
     test<long double, true>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/is_exact.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/is_exact.pass.cpp
index 8431b733f..30dbd9ea1 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/is_exact.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/is_exact.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::is_exact == expected, "is_exact test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, true>();
     test<char, true>();
@@ -54,4 +53,6 @@ int main()
     test<float, false>();
     test<double, false>();
     test<long double, false>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/is_iec559.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/is_iec559.pass.cpp
index 2e9ac223a..215407d74 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/is_iec559.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/is_iec559.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::is_iec559 == expected, "is_iec559 test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, false>();
@@ -58,4 +57,6 @@ int main()
 #else
     test<long double, true>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/is_integer.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/is_integer.pass.cpp
index 6e321d1ef..66ce0cb2b 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/is_integer.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/is_integer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::is_integer == expected, "is_integer test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, true>();
     test<char, true>();
@@ -54,4 +53,6 @@ int main()
     test<float, false>();
     test<double, false>();
     test<long double, false>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/is_modulo.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/is_modulo.pass.cpp
index f6412a97d..2eb2c4ba4 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/is_modulo.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/is_modulo.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::is_modulo == expected, "is_modulo test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
 //    test<char, false>(); // don't know
@@ -54,4 +53,6 @@ int main()
     test<float, false>();
     test<double, false>();
     test<long double, false>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/is_signed.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/is_signed.pass.cpp
index b7a892605..818ad4db9 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/is_signed.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/is_signed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::is_signed == expected, "is_signed test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, char(-1) < char(0)>();
@@ -54,4 +53,6 @@ int main()
     test<float, true>();
     test<double, true>();
     test<long double, true>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/lowest.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/lowest.pass.cpp
index f505f4142..adf147c70 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/lowest.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/lowest.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(T expected)
     assert(std::numeric_limits<const volatile T>::is_bounded);
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>(false);
     test<char>(CHAR_MIN);
@@ -62,4 +61,6 @@ int main()
     test<float>(-FLT_MAX);
     test<double>(-DBL_MAX);
     test<long double>(-LDBL_MAX);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/max.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/max.pass.cpp
index 65d5150a7..91f353ab5 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/max.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(T expected)
     assert(std::numeric_limits<const volatile T>::is_bounded);
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>(true);
     test<char>(CHAR_MAX);
@@ -62,4 +61,6 @@ int main()
     test<float>(FLT_MAX);
     test<double>(DBL_MAX);
     test<long double>(LDBL_MAX);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/max_digits10.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/max_digits10.pass.cpp
index 158e2791f..3cf7d5096 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/max_digits10.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/max_digits10.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::max_digits10 == expected, "max_digits10 test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 0>();
     test<char, 0>();
@@ -55,4 +54,6 @@ int main()
     test<float, 2+(FLT_MANT_DIG * 30103)/100000>();
     test<double, 2+(DBL_MANT_DIG * 30103)/100000>();
     test<long double, 2+(LDBL_MANT_DIG * 30103)/100000>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent.pass.cpp
index 649310938..325ad7979 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::max_exponent == expected, "max_exponent test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 0>();
     test<char, 0>();
@@ -55,4 +54,6 @@ int main()
     test<float, FLT_MAX_EXP>();
     test<double, DBL_MAX_EXP>();
     test<long double, LDBL_MAX_EXP>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent10.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent10.pass.cpp
index c4c7a30a7..e1a4ffe29 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent10.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/max_exponent10.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::max_exponent10 == expected, "max_exponent10 test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 0>();
     test<char, 0>();
@@ -55,4 +54,6 @@ int main()
     test<float, FLT_MAX_10_EXP>();
     test<double, DBL_MAX_10_EXP>();
     test<long double, LDBL_MAX_10_EXP>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/min.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/min.pass.cpp
index a1e61fcdc..0d2cb3c1b 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/min.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(T expected)
     assert(std::numeric_limits<const volatile T>::is_bounded || !std::numeric_limits<const volatile T>::is_signed);
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>(false);
     test<char>(CHAR_MIN);
@@ -62,4 +61,6 @@ int main()
     test<float>(FLT_MIN);
     test<double>(DBL_MIN);
     test<long double>(LDBL_MIN);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent.pass.cpp
index 930d01102..5708d8a20 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::min_exponent == expected, "min_exponent test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 0>();
     test<char, 0>();
@@ -55,4 +54,6 @@ int main()
     test<float, FLT_MIN_EXP>();
     test<double, DBL_MIN_EXP>();
     test<long double, LDBL_MIN_EXP>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent10.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent10.pass.cpp
index 05891b1f6..f598d42fa 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent10.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/min_exponent10.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::min_exponent10 == expected, "min_exponent10 test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 0>();
     test<char, 0>();
@@ -55,4 +54,6 @@ int main()
     test<float, FLT_MIN_10_EXP>();
     test<double, DBL_MIN_10_EXP>();
     test<long double, LDBL_MIN_10_EXP>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/quiet_NaN.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/quiet_NaN.pass.cpp
index 5d5597c47..f4ea61f23 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/quiet_NaN.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/quiet_NaN.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ test()
     test_imp<T>(std::is_floating_point<T>());
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>();
     test<char>();
@@ -75,4 +74,6 @@ int main()
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/radix.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/radix.pass.cpp
index 1514ae841..8f13768b0 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/radix.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/radix.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::radix == expected, "radix test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, 2>();
     test<char, 2>();
@@ -55,4 +54,6 @@ int main()
     test<float, FLT_RADIX>();
     test<double, FLT_RADIX>();
     test<long double, FLT_RADIX>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/round_error.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/round_error.pass.cpp
index 3c2dc5493..ddc4490db 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/round_error.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/round_error.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(T expected)
     assert(std::numeric_limits<const volatile T>::round_error() == expected);
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>(false);
     test<char>(0);
@@ -56,4 +55,6 @@ int main()
     test<float>(0.5);
     test<double>(0.5);
     test<long double>(0.5);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/round_style.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/round_style.pass.cpp
index f1fd20035..81d4ce6eb 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/round_style.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/round_style.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::round_style == expected, "round_style test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, std::round_toward_zero>();
     test<char, std::round_toward_zero>();
@@ -54,4 +53,6 @@ int main()
     test<float, std::round_to_nearest>();
     test<double, std::round_to_nearest>();
     test<long double, std::round_to_nearest>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/signaling_NaN.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/signaling_NaN.pass.cpp
index a0a6d7f84..701386710 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/signaling_NaN.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/signaling_NaN.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ test()
     test_imp<T>(std::is_floating_point<T>());
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>();
     test<char>();
@@ -75,4 +74,6 @@ int main()
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/tinyness_before.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/tinyness_before.pass.cpp
index 901eea4d0..c150e5f23 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/tinyness_before.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/tinyness_before.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::tinyness_before == expected, "tinyness_before test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, false>();
@@ -54,4 +53,6 @@ int main()
     test<float, false>();
     test<double, false>();
     test<long double, false>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits.members/traps.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits.members/traps.pass.cpp
index 8e407c225..e7ea38819 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits.members/traps.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits.members/traps.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test()
     static_assert(std::numeric_limits<const volatile T>::traps == expected, "traps test 4");
 }
 
-int main()
+int main(int, char**)
 {
     test<bool, false>();
     test<char, integral_types_trap>();
@@ -61,4 +60,6 @@ int main()
     test<float, false>();
     test<double, false>();
     test<long double, false>();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.limits/default.pass.cpp b/test/std/language.support/support.limits/limits/numeric.limits/default.pass.cpp
index 6cf5681d8..6e258c13a 100644
--- a/test/std/language.support/support.limits/limits/numeric.limits/default.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.limits/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct A
 
 bool operator == (const A& x, const A& y) {return x.data_ == y.data_;}
 
-int main()
+int main(int, char**)
 {
     static_assert(std::numeric_limits<A>::is_specialized == false,
                  "std::numeric_limits<A>::is_specialized == false");
@@ -80,4 +79,6 @@ int main()
                  "std::numeric_limits<A>::tinyness_before == false");
     static_assert(std::numeric_limits<A>::round_style == std::round_toward_zero,
                  "std::numeric_limits<A>::round_style == std::round_toward_zero");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/numeric.special/nothing_to_do.pass.cpp b/test/std/language.support/support.limits/limits/numeric.special/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/support.limits/limits/numeric.special/nothing_to_do.pass.cpp
+++ b/test/std/language.support/support.limits/limits/numeric.special/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/limits/round.style/check_values.pass.cpp b/test/std/language.support/support.limits/limits/round.style/check_values.pass.cpp
index d6c70c4cf..b1a4e4450 100644
--- a/test/std/language.support/support.limits/limits/round.style/check_values.pass.cpp
+++ b/test/std/language.support/support.limits/limits/round.style/check_values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@ struct two {one _[2];};
 one test(std::float_denorm_style);
 two test(int);
 
-int main()
+int main(int, char**)
 {
     static_assert(std::denorm_indeterminate == -1,
                  "std::denorm_indeterminate == -1");
@@ -31,4 +30,6 @@ int main()
                  "sizeof(test(std::denorm_present)) == 1");
     static_assert(sizeof(test(1)) == 2,
                  "sizeof(test(1)) == 2");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/nothing_to_do.pass.cpp b/test/std/language.support/support.limits/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/language.support/support.limits/nothing_to_do.pass.cpp
+++ b/test/std/language.support/support.limits/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
index 24d2f8002..5458e9194 100644
--- a/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
@@ -1,37 +1,191 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <algorithm> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_clamp                             201603L
-    __cpp_lib_constexpr_swap_algorithms         201806L
-    __cpp_lib_parallel_algorithm                201603L
-    __cpp_lib_robust_nonmodifying_seq_ops       201304L
-    __cpp_lib_sample                            201603L
+// <algorithm>
 
+// Test the feature test macros defined by <algorithm>
+
+/*  Constant                                 Value
+    __cpp_lib_clamp                          201603L [C++17]
+    __cpp_lib_constexpr_swap_algorithms      201806L [C++2a]
+    __cpp_lib_parallel_algorithm             201603L [C++17]
+    __cpp_lib_ranges                         201811L [C++2a]
+    __cpp_lib_robust_nonmodifying_seq_ops    201304L [C++14]
+    __cpp_lib_sample                         201603L [C++17]
 */
 
 #include <algorithm>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <algorithm> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_swap_algorithms
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_parallel_algorithm
+#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_sample
+#   error "__cpp_lib_sample should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_swap_algorithms
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_parallel_algorithm
+#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++14"
+# endif
+# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_sample
+#   error "__cpp_lib_sample should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should be defined in c++17"
+# endif
+# if __cpp_lib_clamp != 201603L
+#   error "__cpp_lib_clamp should have the value 201603L in c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_swap_algorithms
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should be defined in c++17"
+#   endif
+#   if __cpp_lib_parallel_algorithm != 201603L
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++17"
+# endif
+# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_sample
+#   error "__cpp_lib_sample should be defined in c++17"
+# endif
+# if __cpp_lib_sample != 201603L
+#   error "__cpp_lib_sample should have the value 201603L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should be defined in c++2a"
+# endif
+# if __cpp_lib_clamp != 201603L
+#   error "__cpp_lib_clamp should have the value 201603L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_swap_algorithms
+#     error "__cpp_lib_constexpr_swap_algorithms should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_swap_algorithms != 201806L
+#     error "__cpp_lib_constexpr_swap_algorithms should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_swap_algorithms
+#     error "__cpp_lib_constexpr_swap_algorithms should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should be defined in c++2a"
+#   endif
+#   if __cpp_lib_parallel_algorithm != 201603L
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should be defined in c++2a"
+#   endif
+#   if __cpp_lib_ranges != 201811L
+#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++2a"
+# endif
+# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_sample
+#   error "__cpp_lib_sample should be defined in c++2a"
+# endif
+# if __cpp_lib_sample != 201603L
+#   error "__cpp_lib_sample should have the value 201603L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
index 933730442..f5255c0e2 100644
--- a/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <any> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <any>
 
-/*  Constant                                    Value
-    __cpp_lib_any                               201606L
+// Test the feature test macros defined by <any>
 
+/*  Constant         Value
+    __cpp_lib_any    201606L [C++17]
 */
 
 #include <any>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <any> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_any
+#   error "__cpp_lib_any should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_any
+#   error "__cpp_lib_any should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_any
+#   error "__cpp_lib_any should be defined in c++17"
+# endif
+# if __cpp_lib_any != 201606L
+#   error "__cpp_lib_any should have the value 201606L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_any
+#   error "__cpp_lib_any should be defined in c++2a"
+# endif
+# if __cpp_lib_any != 201606L
+#   error "__cpp_lib_any should have the value 201606L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
index 5d25c628b..d590f9804 100644
--- a/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
@@ -1,34 +1,104 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <array> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <array>
 
-/*  Constant                                    Value
-    __cpp_lib_array_constexpr                   201603L
-    __cpp_lib_nonmember_container_access        201411L
+// Test the feature test macros defined by <array>
 
+/*  Constant                                Value
+    __cpp_lib_array_constexpr               201603L [C++17]
+    __cpp_lib_constexpr_misc                201811L [C++2a]
+    __cpp_lib_nonmember_container_access    201411L [C++17]
 */
 
 #include <array>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <array> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should be defined in c++17"
+# endif
+# if __cpp_lib_array_constexpr != 201603L
+#   error "__cpp_lib_array_constexpr should have the value 201603L in c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should be defined in c++2a"
+# endif
+# if __cpp_lib_array_constexpr != 201603L
+#   error "__cpp_lib_array_constexpr should have the value 201603L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_misc != 201811L
+#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
index 78ee09d2f..d8f6f548c 100644
--- a/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
@@ -1,55 +1,121 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <atomic> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_char8_t                           201811L
-    __cpp_lib_atomic_is_always_lock_free        201603L
-    __cpp_lib_atomic_ref                        201806L
+// UNSUPPORTED: libcpp-has-no-threads
 
-*/
+// <atomic>
 
-// UNSUPPORTED: libcpp-has-no-threads
+// Test the feature test macros defined by <atomic>
+
+/*  Constant                                Value
+    __cpp_lib_atomic_is_always_lock_free    201603L [C++17]
+    __cpp_lib_atomic_ref                    201806L [C++2a]
+    __cpp_lib_char8_t                       201811L [C++2a]
+*/
 
 #include <atomic>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <atomic> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_atomic_is_always_lock_free
+#   error "__cpp_lib_atomic_is_always_lock_free should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_atomic_ref
+#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_atomic_is_always_lock_free
+#   error "__cpp_lib_atomic_is_always_lock_free should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_atomic_ref
+#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 17
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++17"
+#   endif
+#   if __cpp_lib_atomic_is_always_lock_free != 201603L
+#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++17"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
-# endif
-#endif
-
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_atomic_is_always_lock_free)
-#  error "__cpp_lib_atomic_is_always_lock_free is not defined"
-# elif __cpp_lib_atomic_is_always_lock_free < 201603L
-#  error "__cpp_lib_atomic_is_always_lock_free has an invalid value"
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#   ifdef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# ifdef __cpp_lib_atomic_ref
+#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++2a"
+#   endif
+#   if __cpp_lib_atomic_is_always_lock_free != 201603L
+#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_atomic_ref
+#     error "__cpp_lib_atomic_ref should be defined in c++2a"
+#   endif
+#   if __cpp_lib_atomic_ref != 201806L
+#     error "__cpp_lib_atomic_ref should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_atomic_ref
+#     error "__cpp_lib_atomic_ref should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
index 5dd7d049a..3e42d06fb 100644
--- a/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
@@ -1,33 +1,58 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <bit> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <bit>
 
-/*  Constant                                    Value
-    __cpp_lib_bit_cast                          201806L
+// Test the feature test macros defined by <bit>
 
+/*  Constant              Value
+    __cpp_lib_bit_cast    201806L [C++2a]
 */
 
 #include <bit>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <bit> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_bit_cast
+#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_bit_cast
+#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_bit_cast
+#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_bit_cast
+#     error "__cpp_lib_bit_cast should be defined in c++2a"
+#   endif
+#   if __cpp_lib_bit_cast != 201806L
+#     error "__cpp_lib_bit_cast should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_bit_cast
+#     error "__cpp_lib_bit_cast should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/charconv.pass.cpp b/test/std/language.support/support.limits/support.limits.general/charconv.pass.cpp
index f1e252f8e..2afe2e26b 100644
--- a/test/std/language.support/support.limits/support.limits.general/charconv.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/charconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 //  ensure that the macros that are supposed to be defined in <utility> are defined.
 
@@ -29,4 +28,6 @@ int main()
 # error "__cpp_lib_fooby has an invalid value"
 #endif
 */
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
index 1d0a79ec1..88da2dcca 100644
--- a/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
@@ -1,34 +1,81 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <chrono> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_chrono                            201611L
-    __cpp_lib_chrono_udls                       201304L
+// <chrono>
 
+// Test the feature test macros defined by <chrono>
+
+/*  Constant                 Value
+    __cpp_lib_chrono         201611L [C++17]
+    __cpp_lib_chrono_udls    201304L [C++14]
 */
 
 #include <chrono>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <chrono> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should not be defined before c++14"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should be defined in c++14"
+# endif
+# if __cpp_lib_chrono_udls != 201304L
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++14"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should be defined in c++17"
+# endif
+# if __cpp_lib_chrono != 201611L
+#   error "__cpp_lib_chrono should have the value 201611L in c++17"
+# endif
+
+# ifndef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should be defined in c++17"
+# endif
+# if __cpp_lib_chrono_udls != 201304L
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should be defined in c++2a"
+# endif
+# if __cpp_lib_chrono != 201611L
+#   error "__cpp_lib_chrono should have the value 201611L in c++2a"
+# endif
+
+# ifndef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should be defined in c++2a"
+# endif
+# if __cpp_lib_chrono_udls != 201304L
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
index b5b0309f8..d81218e66 100644
--- a/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
@@ -1,34 +1,90 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <cmath> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_hypot                             201603L
-    __cpp_lib_math_special_functions            201603L
+// <cmath>
 
+// Test the feature test macros defined by <cmath>
+
+/*  Constant                            Value
+    __cpp_lib_hypot                     201603L [C++17]
+    __cpp_lib_math_special_functions    201603L [C++17]
 */
 
 #include <cmath>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <cmath> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_math_special_functions
+#   error "__cpp_lib_math_special_functions should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_math_special_functions
+#   error "__cpp_lib_math_special_functions should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should be defined in c++17"
+# endif
+# if __cpp_lib_hypot != 201603L
+#   error "__cpp_lib_hypot should have the value 201603L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should be defined in c++17"
+#   endif
+#   if __cpp_lib_math_special_functions != 201603L
+#     error "__cpp_lib_math_special_functions should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should be defined in c++2a"
+# endif
+# if __cpp_lib_hypot != 201603L
+#   error "__cpp_lib_hypot should have the value 201603L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should be defined in c++2a"
+#   endif
+#   if __cpp_lib_math_special_functions != 201603L
+#     error "__cpp_lib_math_special_functions should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp
new file mode 100644
index 000000000..7f1836fba
--- /dev/null
+++ b/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <compare>
+
+// Test the feature test macros defined by <compare>
+
+/*  Constant                          Value
+    __cpp_lib_three_way_comparison    201711L [C++2a]
+*/
+
+#include <compare>
+#include "test_macros.h"
+
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_three_way_comparison
+#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_three_way_comparison
+#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_three_way_comparison
+#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_three_way_comparison
+#     error "__cpp_lib_three_way_comparison should be defined in c++2a"
+#   endif
+#   if __cpp_lib_three_way_comparison != 201711L
+#     error "__cpp_lib_three_way_comparison should have the value 201711L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_three_way_comparison
+#     error "__cpp_lib_three_way_comparison should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
index be25d793d..bcff0bbe1 100644
--- a/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
@@ -1,33 +1,58 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <complex> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <complex>
 
-/*  Constant                                    Value
-    __cpp_lib_complex_udls                      201309L
+// Test the feature test macros defined by <complex>
 
+/*  Constant                  Value
+    __cpp_lib_complex_udls    201309L [C++14]
 */
 
 #include <complex>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <complex> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should not be defined before c++14"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifndef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should be defined in c++14"
+# endif
+# if __cpp_lib_complex_udls != 201309L
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++14"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should be defined in c++17"
+# endif
+# if __cpp_lib_complex_udls != 201309L
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should be defined in c++2a"
+# endif
+# if __cpp_lib_complex_udls != 201309L
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
index b21239122..16febf8d3 100644
--- a/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 //  ensure that the macros that are supposed to be defined in <concepts> are defined.
 
@@ -31,4 +30,6 @@ int main()
 # error "__cpp_lib_fooby has an invalid value"
 #endif
 */
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
index ad743b51e..b18ea07ea 100644
--- a/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <cstddef> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <cstddef>
 
-/*  Constant                                    Value
-    __cpp_lib_byte                              201603L
+// Test the feature test macros defined by <cstddef>
 
+/*  Constant          Value
+    __cpp_lib_byte    201603L [C++17]
 */
 
 #include <cstddef>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <cstddef> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_byte
+#   error "__cpp_lib_byte should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_byte
+#   error "__cpp_lib_byte should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_byte
+#   error "__cpp_lib_byte should be defined in c++17"
+# endif
+# if __cpp_lib_byte != 201603L
+#   error "__cpp_lib_byte should have the value 201603L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_byte
+#   error "__cpp_lib_byte should be defined in c++2a"
+# endif
+# if __cpp_lib_byte != 201603L
+#   error "__cpp_lib_byte should have the value 201603L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
index 188d2f3c0..9d07dcdd2 100644
--- a/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
@@ -1,45 +1,98 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <deque> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <deque>
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_nonmember_container_access        201411L
+// Test the feature test macros defined by <deque>
 
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
 #include <deque>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <deque> are defined.
-
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
index 3ea235bdb..1ecebb48f 100644
--- a/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <exception> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <exception>
 
-/*  Constant                                    Value
-    __cpp_lib_uncaught_exceptions               201411L
+// Test the feature test macros defined by <exception>
 
+/*  Constant                         Value
+    __cpp_lib_uncaught_exceptions    201411L [C++17]
 */
 
 #include <exception>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <exception> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should be defined in c++17"
+# endif
+# if __cpp_lib_uncaught_exceptions != 201411L
+#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should be defined in c++2a"
+# endif
+# if __cpp_lib_uncaught_exceptions != 201411L
+#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
index 2fcd44cd0..b05f41bb1 100644
--- a/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 //  ensure that the macros that are supposed to be defined in <execution> are defined.
 
@@ -31,4 +30,6 @@ int main()
 # error "__cpp_lib_fooby has an invalid value"
 #endif
 */
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
index 4d03634c2..d1c09fc7e 100644
--- a/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
@@ -1,52 +1,81 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <filesystem> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_char8_t                           201811L
-    __cpp_lib_filesystem                        201703L
+// <filesystem>
 
+// Test the feature test macros defined by <filesystem>
+
+/*  Constant                Value
+    __cpp_lib_char8_t       201811L [C++2a]
+    __cpp_lib_filesystem    201703L [C++17]
 */
 
 #include <filesystem>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <filesystem> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should be defined in c++17"
+# endif
+# if __cpp_lib_filesystem != 201703L
+#   error "__cpp_lib_filesystem should have the value 201703L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
-# endif
-#endif
-
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_filesystem)
-#  error "__cpp_lib_filesystem is not defined"
-# elif __cpp_lib_filesystem < 201703L
-#  error "__cpp_lib_filesystem has an invalid value"
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should be defined in c++2a"
+# endif
+# if __cpp_lib_filesystem != 201703L
+#   error "__cpp_lib_filesystem should have the value 201703L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
index 9b44f6e2c..7ecad6d3e 100644
--- a/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
@@ -1,47 +1,147 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <forward_list> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_incomplete_container_elements     201505L
-    __cpp_lib_list_remove_return_type           201806L
-    __cpp_lib_nonmember_container_access        201411L
+// <forward_list>
 
+// Test the feature test macros defined by <forward_list>
+
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_incomplete_container_elements       201505L [C++17]
+    __cpp_lib_list_remove_return_type             201806L [C++2a]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
 #include <forward_list>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <forward_list> are defined.
-
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++17"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_list_remove_return_type
+#     error "__cpp_lib_list_remove_return_type should be defined in c++2a"
+#   endif
+#   if __cpp_lib_list_remove_return_type != 201806L
+#     error "__cpp_lib_list_remove_return_type should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_list_remove_return_type
+#     error "__cpp_lib_list_remove_return_type should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
index 57978cbb3..a29a1d708 100644
--- a/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
@@ -1,45 +1,244 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <functional> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <functional>
 
-/*  Constant                                    Value
-    __cpp_lib_boyer_moore_searcher              201603L
-    __cpp_lib_invoke                            201411L
-    __cpp_lib_not_fn                            201603L
-    __cpp_lib_result_of_sfinae                  201210L
-    __cpp_lib_transparent_operators             201510L
+// Test the feature test macros defined by <functional>
 
+/*  Constant                           Value
+    __cpp_lib_bind_front               201811L [C++2a]
+    __cpp_lib_boyer_moore_searcher     201603L [C++17]
+    __cpp_lib_constexpr_misc           201811L [C++2a]
+    __cpp_lib_invoke                   201411L [C++17]
+    __cpp_lib_not_fn                   201603L [C++17]
+    __cpp_lib_ranges                   201811L [C++2a]
+    __cpp_lib_result_of_sfinae         201210L [C++14]
+    __cpp_lib_transparent_operators    201210L [C++14]
+                                       201510L [C++17]
 */
 
 #include <functional>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <functional> are defined.
+#if TEST_STD_VER < 14
 
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_invoke)
-#  error "__cpp_lib_invoke is not defined"
-# elif __cpp_lib_invoke < 201411L
-#  error "__cpp_lib_invoke has an invalid value"
+# ifdef __cpp_lib_bind_front
+#   error "__cpp_lib_bind_front should not be defined before c++2a"
 # endif
-#endif
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_boyer_moore_searcher
+#   error "__cpp_lib_boyer_moore_searcher should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should not be defined before c++14"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_bind_front
+#   error "__cpp_lib_bind_front should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_boyer_moore_searcher
+#   error "__cpp_lib_boyer_moore_searcher should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++14"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++14"
+# endif
+
+# ifndef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should be defined in c++14"
+# endif
+# if __cpp_lib_transparent_operators != 201210L
+#   error "__cpp_lib_transparent_operators should have the value 201210L in c++14"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_bind_front
+#   error "__cpp_lib_bind_front should not be defined before c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should be defined in c++17"
+#   endif
+#   if __cpp_lib_boyer_moore_searcher != 201603L
+#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should be defined in c++17"
+# endif
+# if __cpp_lib_invoke != 201411L
+#   error "__cpp_lib_invoke should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should be defined in c++17"
+# endif
+# if __cpp_lib_not_fn != 201603L
+#   error "__cpp_lib_not_fn should have the value 201603L in c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++17"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++17"
+# endif
+
+# ifndef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should be defined in c++17"
+# endif
+# if __cpp_lib_transparent_operators != 201510L
+#   error "__cpp_lib_transparent_operators should have the value 201510L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_bind_front
+#     error "__cpp_lib_bind_front should be defined in c++2a"
+#   endif
+#   if __cpp_lib_bind_front != 201811L
+#     error "__cpp_lib_bind_front should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_bind_front
+#     error "__cpp_lib_bind_front should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should be defined in c++2a"
+#   endif
+#   if __cpp_lib_boyer_moore_searcher != 201603L
+#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_misc != 201811L
+#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should be defined in c++2a"
+# endif
+# if __cpp_lib_invoke != 201411L
+#   error "__cpp_lib_invoke should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should be defined in c++2a"
+# endif
+# if __cpp_lib_not_fn != 201603L
+#   error "__cpp_lib_not_fn should have the value 201603L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should be defined in c++2a"
+#   endif
+#   if __cpp_lib_ranges != 201811L
+#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++2a"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++2a"
+# endif
+
+# ifndef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should be defined in c++2a"
+# endif
+# if __cpp_lib_transparent_operators != 201510L
+#   error "__cpp_lib_transparent_operators should have the value 201510L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
index 74ab48e3c..23378e0e2 100644
--- a/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
@@ -1,33 +1,58 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <iomanip> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <iomanip>
 
-/*  Constant                                    Value
-    __cpp_lib_quoted_string_io                  201304L
+// Test the feature test macros defined by <iomanip>
 
+/*  Constant                      Value
+    __cpp_lib_quoted_string_io    201304L [C++14]
 */
 
 #include <iomanip>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <iomanip> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should not be defined before c++14"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifndef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should be defined in c++14"
+# endif
+# if __cpp_lib_quoted_string_io != 201304L
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++14"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should be defined in c++17"
+# endif
+# if __cpp_lib_quoted_string_io != 201304L
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should be defined in c++2a"
+# endif
+# if __cpp_lib_quoted_string_io != 201304L
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp
index 7ede323ca..3d8fb7a4c 100644
--- a/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp
@@ -1,43 +1,58 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <istream> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_char8_t                           201811L
+// <istream>
 
+// Test the feature test macros defined by <istream>
+
+/*  Constant             Value
+    __cpp_lib_char8_t    201811L [C++2a]
 */
 
 #include <istream>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <istream> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
 # endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
index 50c582fd8..9c1719b53 100644
--- a/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
@@ -1,36 +1,182 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <iterator> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_array_constexpr                   201603L
-    __cpp_lib_make_reverse_iterator             201402L
-    __cpp_lib_nonmember_container_access        201411L
-    __cpp_lib_null_iterators                    201304L
+// <iterator>
 
+// Test the feature test macros defined by <iterator>
+
+/*  Constant                                Value
+    __cpp_lib_array_constexpr               201603L [C++17]
+    __cpp_lib_constexpr_misc                201811L [C++2a]
+    __cpp_lib_make_reverse_iterator         201402L [C++14]
+    __cpp_lib_nonmember_container_access    201411L [C++17]
+    __cpp_lib_null_iterators                201304L [C++14]
+    __cpp_lib_ranges                        201811L [C++2a]
 */
 
 #include <iterator>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <iterator> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++14"
+# endif
+# if __cpp_lib_make_reverse_iterator != 201402L
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++14"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should be defined in c++14"
+# endif
+# if __cpp_lib_null_iterators != 201304L
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should be defined in c++17"
+# endif
+# if __cpp_lib_array_constexpr != 201603L
+#   error "__cpp_lib_array_constexpr should have the value 201603L in c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++17"
+# endif
+# if __cpp_lib_make_reverse_iterator != 201402L
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++17"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should be defined in c++17"
+# endif
+# if __cpp_lib_null_iterators != 201304L
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should be defined in c++2a"
+# endif
+# if __cpp_lib_array_constexpr != 201603L
+#   error "__cpp_lib_array_constexpr should have the value 201603L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_misc != 201811L
+#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++2a"
+# endif
+# if __cpp_lib_make_reverse_iterator != 201402L
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should be defined in c++2a"
+# endif
+# if __cpp_lib_null_iterators != 201304L
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should be defined in c++2a"
+#   endif
+#   if __cpp_lib_ranges != 201811L
+#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp
index 7f1869237..2d2f243e7 100644
--- a/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp
@@ -1,43 +1,58 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <limits> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_char8_t                           201811L
+// <limits>
 
+// Test the feature test macros defined by <limits>
+
+/*  Constant             Value
+    __cpp_lib_char8_t    201811L [C++2a]
 */
 
 #include <limits>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <limits> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
 # endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
index e6e65655b..b736d1f9a 100644
--- a/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
@@ -1,47 +1,147 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <list> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_incomplete_container_elements     201505L
-    __cpp_lib_list_remove_return_type           201806L
-    __cpp_lib_nonmember_container_access        201411L
+// <list>
 
+// Test the feature test macros defined by <list>
+
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_incomplete_container_elements       201505L [C++17]
+    __cpp_lib_list_remove_return_type             201806L [C++2a]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
 #include <list>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <list> are defined.
-
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++17"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_list_remove_return_type
+#     error "__cpp_lib_list_remove_return_type should be defined in c++2a"
+#   endif
+#   if __cpp_lib_list_remove_return_type != 201806L
+#     error "__cpp_lib_list_remove_return_type should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_list_remove_return_type
+#     error "__cpp_lib_list_remove_return_type should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp
index 602273329..eeea5390a 100644
--- a/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp
@@ -1,43 +1,58 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <locale> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_char8_t                           201811L
+// <locale>
 
+// Test the feature test macros defined by <locale>
+
+/*  Constant             Value
+    __cpp_lib_char8_t    201811L [C++2a]
 */
 
 #include <locale>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <locale> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
 # endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
index e7dbf7d20..a41dd1b8e 100644
--- a/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
@@ -1,48 +1,170 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <map> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <map>
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_generic_associative_lookup        201304L
-    __cpp_lib_map_try_emplace                   201411L
-    __cpp_lib_node_extract                      201606L
-    __cpp_lib_nonmember_container_access        201411L
+// Test the feature test macros defined by <map>
 
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_generic_associative_lookup          201304L [C++14]
+    __cpp_lib_map_try_emplace                     201411L [C++17]
+    __cpp_lib_node_extract                        201606L [C++17]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
 #include <map>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <map> are defined.
-
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++14"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++17"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should be defined in c++17"
+# endif
+# if __cpp_lib_map_try_emplace != 201411L
+#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++17"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++2a"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should be defined in c++2a"
+# endif
+# if __cpp_lib_map_try_emplace != 201411L
+#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++2a"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
index 4ffb7bd80..6c845d71f 100644
--- a/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
@@ -1,40 +1,246 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <memory> feature macros
-
-/*  Constant                                    Value
-    __cpp_lib_addressof_constexpr               201603L
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_enable_shared_from_this           201603L
-    __cpp_lib_make_unique                       201304L
-    __cpp_lib_raw_memory_algorithms             201606L
-    __cpp_lib_shared_ptr_arrays                 201611L
-    __cpp_lib_shared_ptr_weak_type              201606L
-    __cpp_lib_transparent_operators             201510L
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <memory>
 
+// Test the feature test macros defined by <memory>
+
+/*  Constant                                      Value
+    __cpp_lib_addressof_constexpr                 201603L [C++17]
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_enable_shared_from_this             201603L [C++17]
+    __cpp_lib_make_unique                         201304L [C++14]
+    __cpp_lib_ranges                              201811L [C++2a]
+    __cpp_lib_raw_memory_algorithms               201606L [C++17]
+    __cpp_lib_shared_ptr_arrays                   201611L [C++17]
+    __cpp_lib_shared_ptr_weak_type                201606L [C++17]
 */
 
 #include <memory>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <memory> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_addressof_constexpr
+#   error "__cpp_lib_addressof_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_ptr_arrays
+#   error "__cpp_lib_shared_ptr_arrays should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_addressof_constexpr
+#   error "__cpp_lib_addressof_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should be defined in c++14"
+# endif
+# if __cpp_lib_make_unique != 201304L
+#   error "__cpp_lib_make_unique should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_ptr_arrays
+#   error "__cpp_lib_shared_ptr_arrays should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should be defined in c++17"
+#   endif
+#   if __cpp_lib_addressof_constexpr != 201603L
+#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should not be defined when TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should be defined in c++17"
+# endif
+# if __cpp_lib_enable_shared_from_this != 201603L
+#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should be defined in c++17"
+# endif
+# if __cpp_lib_make_unique != 201304L
+#   error "__cpp_lib_make_unique should have the value 201304L in c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should be defined in c++17"
+# endif
+# if __cpp_lib_raw_memory_algorithms != 201606L
+#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should be defined in c++17"
+#   endif
+#   if __cpp_lib_shared_ptr_arrays != 201611L
+#     error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++17"
+# endif
+# if __cpp_lib_shared_ptr_weak_type != 201606L
+#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should be defined in c++2a"
+#   endif
+#   if __cpp_lib_addressof_constexpr != 201603L
+#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should not be defined when TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should be defined in c++2a"
+# endif
+# if __cpp_lib_enable_shared_from_this != 201603L
+#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should be defined in c++2a"
+# endif
+# if __cpp_lib_make_unique != 201304L
+#   error "__cpp_lib_make_unique should have the value 201304L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should be defined in c++2a"
+#   endif
+#   if __cpp_lib_ranges != 201811L
+#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should be defined in c++2a"
+# endif
+# if __cpp_lib_raw_memory_algorithms != 201606L
+#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should be defined in c++2a"
+#   endif
+#   if __cpp_lib_shared_ptr_arrays != 201611L
+#     error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++2a"
+# endif
+# if __cpp_lib_shared_ptr_weak_type != 201606L
+#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp
index 857ece267..d712a8bca 100644
--- a/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 //  ensure that the macros that are supposed to be defined in <memory_resource> are defined.
 
@@ -31,4 +30,6 @@ int main()
 # error "__cpp_lib_fooby has an invalid value"
 #endif
 */
+
+  return 0;
 }
diff --git a/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
index 72209d9f4..9dae806b8 100644
--- a/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <mutex> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <mutex>
 
-/*  Constant                                    Value
-    __cpp_lib_scoped_lock                       201703L
+// Test the feature test macros defined by <mutex>
 
+/*  Constant                 Value
+    __cpp_lib_scoped_lock    201703L [C++17]
 */
 
 #include <mutex>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <mutex> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should be defined in c++17"
+# endif
+# if __cpp_lib_scoped_lock != 201703L
+#   error "__cpp_lib_scoped_lock should have the value 201703L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should be defined in c++2a"
+# endif
+# if __cpp_lib_scoped_lock != 201703L
+#   error "__cpp_lib_scoped_lock should have the value 201703L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
index 856bd8b01..5f012cd55 100644
--- a/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
@@ -1,34 +1,104 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <new> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <new>
 
-/*  Constant                                    Value
-    __cpp_lib_hardware_interference_size        201703L
-    __cpp_lib_launder                           201606L
+// Test the feature test macros defined by <new>
 
+/*  Constant                                Value
+    __cpp_lib_destroying_delete             201806L [C++2a]
+    __cpp_lib_hardware_interference_size    201703L [C++17]
+    __cpp_lib_launder                       201606L [C++17]
 */
 
 #include <new>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <new> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_destroying_delete
+#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_launder
+#   error "__cpp_lib_launder should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_destroying_delete
+#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_launder
+#   error "__cpp_lib_launder should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_destroying_delete
+#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should be defined in c++17"
+# endif
+# if __cpp_lib_hardware_interference_size != 201703L
+#   error "__cpp_lib_hardware_interference_size should have the value 201703L in c++17"
+# endif
+
+# ifndef __cpp_lib_launder
+#   error "__cpp_lib_launder should be defined in c++17"
+# endif
+# if __cpp_lib_launder != 201606L
+#   error "__cpp_lib_launder should have the value 201606L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_destroying_delete
+#     error "__cpp_lib_destroying_delete should be defined in c++2a"
+#   endif
+#   if __cpp_lib_destroying_delete != 201806L
+#     error "__cpp_lib_destroying_delete should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_destroying_delete
+#     error "__cpp_lib_destroying_delete should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should be defined in c++2a"
+# endif
+# if __cpp_lib_hardware_interference_size != 201703L
+#   error "__cpp_lib_hardware_interference_size should have the value 201703L in c++2a"
+# endif
+
+# ifndef __cpp_lib_launder
+#   error "__cpp_lib_launder should be defined in c++2a"
+# endif
+# if __cpp_lib_launder != 201606L
+#   error "__cpp_lib_launder should have the value 201606L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
index 61547621e..eb5eb557b 100644
--- a/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
@@ -1,34 +1,90 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <numeric> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_gcd_lcm                           201606L
-    __cpp_lib_parallel_algorithm                201603L
+// <numeric>
 
+// Test the feature test macros defined by <numeric>
+
+/*  Constant                        Value
+    __cpp_lib_gcd_lcm               201606L [C++17]
+    __cpp_lib_parallel_algorithm    201603L [C++17]
 */
 
 #include <numeric>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <numeric> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_parallel_algorithm
+#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_parallel_algorithm
+#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should be defined in c++17"
+# endif
+# if __cpp_lib_gcd_lcm != 201606L
+#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should be defined in c++17"
+#   endif
+#   if __cpp_lib_parallel_algorithm != 201603L
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should be defined in c++2a"
+# endif
+# if __cpp_lib_gcd_lcm != 201606L
+#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should be defined in c++2a"
+#   endif
+#   if __cpp_lib_parallel_algorithm != 201603L
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
index b9795181a..d88fbb0fe 100644
--- a/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <optional> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <optional>
 
-/*  Constant                                    Value
-    __cpp_lib_optional                          201606L
+// Test the feature test macros defined by <optional>
 
+/*  Constant              Value
+    __cpp_lib_optional    201606L [C++17]
 */
 
 #include <optional>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <optional> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_optional
+#   error "__cpp_lib_optional should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_optional
+#   error "__cpp_lib_optional should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_optional
+#   error "__cpp_lib_optional should be defined in c++17"
+# endif
+# if __cpp_lib_optional != 201606L
+#   error "__cpp_lib_optional should have the value 201606L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_optional
+#   error "__cpp_lib_optional should be defined in c++2a"
+# endif
+# if __cpp_lib_optional != 201606L
+#   error "__cpp_lib_optional should have the value 201606L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp
index 668b39e32..d3ba25867 100644
--- a/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp
@@ -1,43 +1,58 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <ostream> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_char8_t                           201811L
+// <ostream>
 
+// Test the feature test macros defined by <ostream>
+
+/*  Constant             Value
+    __cpp_lib_char8_t    201811L [C++2a]
 */
 
 #include <ostream>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <ostream> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+#elif TEST_STD_VER == 17
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
 # endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
index fdc499328..66becadbb 100644
--- a/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <regex> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <regex>
 
-/*  Constant                                    Value
-    __cpp_lib_nonmember_container_access        201411L
+// Test the feature test macros defined by <regex>
 
+/*  Constant                                Value
+    __cpp_lib_nonmember_container_access    201411L [C++17]
 */
 
 #include <regex>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <regex> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
index 84b2dbdb2..2ea98256e 100644
--- a/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <scoped_allocator> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <scoped_allocator>
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
+// Test the feature test macros defined by <scoped_allocator>
 
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
 */
 
 #include <scoped_allocator>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <scoped_allocator> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
index 716eae6d9..80cf9c0af 100644
--- a/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
@@ -1,47 +1,147 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <set> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_generic_associative_lookup        201304L
-    __cpp_lib_node_extract                      201606L
-    __cpp_lib_nonmember_container_access        201411L
+// <set>
 
+// Test the feature test macros defined by <set>
+
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_generic_associative_lookup          201304L [C++14]
+    __cpp_lib_node_extract                        201606L [C++17]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
 #include <set>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <set> are defined.
-
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++14"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++17"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++17"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++2a"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++2a"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
index 33387e890..7c92dfc08 100644
--- a/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
@@ -1,36 +1,113 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <shared_mutex> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_shared_mutex                      201505L
-    __cpp_lib_shared_timed_mutex                201402L
+// UNSUPPORTED: libcpp-has-no-threads
 
-*/
+// <shared_mutex>
 
-// UNSUPPORTED: libcpp-has-no-threads
+// Test the feature test macros defined by <shared_mutex>
+
+/*  Constant                        Value
+    __cpp_lib_shared_mutex          201505L [C++17]
+    __cpp_lib_shared_timed_mutex    201402L [C++14]
+*/
 
 #include <shared_mutex>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <shared_mutex> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_shared_mutex
+#   error "__cpp_lib_shared_mutex should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_timed_mutex
+#   error "__cpp_lib_shared_timed_mutex should not be defined before c++14"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_shared_mutex
+#   error "__cpp_lib_shared_mutex should not be defined before c++17"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++14"
+#   endif
+#   if __cpp_lib_shared_timed_mutex != 201402L
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++14"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+#elif TEST_STD_VER == 17
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should be defined in c++17"
+#   endif
+#   if __cpp_lib_shared_mutex != 201505L
+#     error "__cpp_lib_shared_mutex should have the value 201505L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++17"
+#   endif
+#   if __cpp_lib_shared_timed_mutex != 201402L
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should be defined in c++2a"
+#   endif
+#   if __cpp_lib_shared_mutex != 201505L
+#     error "__cpp_lib_shared_mutex should have the value 201505L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++2a"
+#   endif
+#   if __cpp_lib_shared_timed_mutex != 201402L
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
index 87e8c8f96..bdd517da0 100644
--- a/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
@@ -1,58 +1,173 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <string> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <string>
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_char8_t                           201811L
-    __cpp_lib_nonmember_container_access        201411L
-    __cpp_lib_string_udls                       201304L
-    __cpp_lib_string_view                       201606L
+// Test the feature test macros defined by <string>
 
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_char8_t                             201811L [C++2a]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
+    __cpp_lib_string_udls                         201304L [C++14]
+    __cpp_lib_string_view                         201606L [C++17]
 */
 
 #include <string>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <string> are defined.
+#if TEST_STD_VER < 14
 
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
 # endif
-#endif
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should be defined in c++14"
+# endif
+# if __cpp_lib_string_udls != 201304L
+#   error "__cpp_lib_string_udls should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should be defined in c++17"
+# endif
+# if __cpp_lib_string_udls != 201304L
+#   error "__cpp_lib_string_udls should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should be defined in c++17"
+# endif
+# if __cpp_lib_string_view != 201606L
+#   error "__cpp_lib_string_view should have the value 201606L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should be defined in c++2a"
+# endif
+# if __cpp_lib_string_udls != 201304L
+#   error "__cpp_lib_string_udls should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should be defined in c++2a"
+# endif
+# if __cpp_lib_string_view != 201606L
+#   error "__cpp_lib_string_view should have the value 201606L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
index bbdeb0b5a..816083e0d 100644
--- a/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
@@ -1,44 +1,107 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <string_view> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <string_view>
 
-/*  Constant                                    Value
-    __cpp_lib_char8_t                           201811L
-    __cpp_lib_string_view                       201606L
+// Test the feature test macros defined by <string_view>
 
+/*  Constant                    Value
+    __cpp_lib_char8_t           201811L [C++2a]
+    __cpp_lib_constexpr_misc    201811L [C++2a]
+    __cpp_lib_string_view       201606L [C++17]
 */
 
 #include <string_view>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <string_view> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should be defined in c++17"
+# endif
+# if __cpp_lib_string_view != 201606L
+#   error "__cpp_lib_string_view should have the value 201606L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_misc != 201811L
+#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should be defined in c++2a"
+# endif
+# if __cpp_lib_string_view != 201606L
+#   error "__cpp_lib_string_view should have the value 201606L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
index ddff29d78..5c1e6580c 100644
--- a/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
@@ -1,36 +1,156 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <tuple> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_apply                             201603L
-    __cpp_lib_make_from_tuple                   201606L
-    __cpp_lib_tuple_element_t                   201402L
-    __cpp_lib_tuples_by_type                    201304L
+// <tuple>
 
+// Test the feature test macros defined by <tuple>
+
+/*  Constant                     Value
+    __cpp_lib_apply              201603L [C++17]
+    __cpp_lib_constexpr_misc     201811L [C++2a]
+    __cpp_lib_make_from_tuple    201606L [C++17]
+    __cpp_lib_tuple_element_t    201402L [C++14]
+    __cpp_lib_tuples_by_type     201304L [C++14]
 */
 
 #include <tuple>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <tuple> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_apply
+#   error "__cpp_lib_apply should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should not be defined before c++14"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_apply
+#   error "__cpp_lib_apply should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should be defined in c++14"
+# endif
+# if __cpp_lib_tuple_element_t != 201402L
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++14"
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++14"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++14"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_apply
+#   error "__cpp_lib_apply should be defined in c++17"
+# endif
+# if __cpp_lib_apply != 201603L
+#   error "__cpp_lib_apply should have the value 201603L in c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should be defined in c++17"
+# endif
+# if __cpp_lib_make_from_tuple != 201606L
+#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should be defined in c++17"
+# endif
+# if __cpp_lib_tuple_element_t != 201402L
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++17"
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++17"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_apply
+#   error "__cpp_lib_apply should be defined in c++2a"
+# endif
+# if __cpp_lib_apply != 201603L
+#   error "__cpp_lib_apply should have the value 201603L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_misc != 201811L
+#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should be defined in c++2a"
+# endif
+# if __cpp_lib_make_from_tuple != 201606L
+#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should be defined in c++2a"
+# endif
+# if __cpp_lib_tuple_element_t != 201402L
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++2a"
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++2a"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
index e53da7ef7..7e8b3de35 100644
--- a/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
@@ -1,54 +1,396 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <type_traits> feature macros
-
-/*  Constant                                    Value
-    __cpp_lib_bool_constant                     201505L
-    __cpp_lib_has_unique_object_representations 201606L
-    __cpp_lib_integral_constant_callable        201304L
-    __cpp_lib_is_aggregate                      201703L
-    __cpp_lib_is_final                          201402L
-    __cpp_lib_is_invocable                      201703L
-    __cpp_lib_is_null_pointer                   201309L
-    __cpp_lib_is_swappable                      201603L
-    __cpp_lib_logical_traits                    201510L
-    __cpp_lib_result_of_sfinae                  201210L
-    __cpp_lib_transformation_trait_aliases      201304L
-    __cpp_lib_type_trait_variable_templates     201510L
-    __cpp_lib_void_t                            201411L
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <type_traits>
 
+// Test the feature test macros defined by <type_traits>
+
+/*  Constant                                       Value
+    __cpp_lib_bool_constant                        201505L [C++17]
+    __cpp_lib_has_unique_object_representations    201606L [C++17]
+    __cpp_lib_integral_constant_callable           201304L [C++14]
+    __cpp_lib_is_aggregate                         201703L [C++17]
+    __cpp_lib_is_constant_evaluated                201811L [C++2a]
+    __cpp_lib_is_final                             201402L [C++14]
+    __cpp_lib_is_invocable                         201703L [C++17]
+    __cpp_lib_is_null_pointer                      201309L [C++14]
+    __cpp_lib_is_swappable                         201603L [C++17]
+    __cpp_lib_logical_traits                       201510L [C++17]
+    __cpp_lib_result_of_sfinae                     201210L [C++14]
+    __cpp_lib_transformation_trait_aliases         201304L [C++14]
+    __cpp_lib_type_trait_variable_templates        201510L [C++17]
+    __cpp_lib_void_t                               201411L [C++17]
 */
 
 #include <type_traits>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <type_traits> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should not be defined before c++17"
+# endif
 
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_void_t)
-#  error "__cpp_lib_void_t is not defined"
-# elif __cpp_lib_void_t < 201411L
-#  error "__cpp_lib_void_t has an invalid value"
+# ifdef __cpp_lib_has_unique_object_representations
+#   error "__cpp_lib_has_unique_object_representations should not be defined before c++17"
 # endif
-#endif
 
+# ifdef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should not be defined before c++14"
+# endif
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_is_aggregate
+#   error "__cpp_lib_is_aggregate should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_constant_evaluated
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_has_unique_object_representations
+#   error "__cpp_lib_has_unique_object_representations should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should be defined in c++14"
+# endif
+# if __cpp_lib_integral_constant_callable != 201304L
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_is_aggregate
+#   error "__cpp_lib_is_aggregate should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_constant_evaluated
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should be defined in c++14"
+# endif
+# if __cpp_lib_is_final != 201402L
+#   error "__cpp_lib_is_final should have the value 201402L in c++14"
+# endif
+
+# ifdef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should be defined in c++14"
+# endif
+# if __cpp_lib_is_null_pointer != 201309L
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++14"
+# endif
+
+# ifdef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++14"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++14"
+# endif
+
+# ifndef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++14"
+# endif
+# if __cpp_lib_transformation_trait_aliases != 201304L
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should be defined in c++17"
+# endif
+# if __cpp_lib_bool_constant != 201505L
+#   error "__cpp_lib_bool_constant should have the value 201505L in c++17"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should be defined in c++17"
+#   endif
+#   if __cpp_lib_has_unique_object_representations != 201606L
+#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should be defined in c++17"
+# endif
+# if __cpp_lib_integral_constant_callable != 201304L
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++17"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
+#   ifndef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should be defined in c++17"
+#   endif
+#   if __cpp_lib_is_aggregate != 201703L
+#     error "__cpp_lib_is_aggregate should have the value 201703L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001 is not defined!"
+#   endif
+# endif
+
+# ifdef __cpp_lib_is_constant_evaluated
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should be defined in c++17"
+# endif
+# if __cpp_lib_is_final != 201402L
+#   error "__cpp_lib_is_final should have the value 201402L in c++17"
+# endif
+
+# ifndef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should be defined in c++17"
+# endif
+# if __cpp_lib_is_invocable != 201703L
+#   error "__cpp_lib_is_invocable should have the value 201703L in c++17"
+# endif
+
+# ifndef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should be defined in c++17"
+# endif
+# if __cpp_lib_is_null_pointer != 201309L
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++17"
+# endif
+
+# ifndef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should be defined in c++17"
+# endif
+# if __cpp_lib_is_swappable != 201603L
+#   error "__cpp_lib_is_swappable should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should be defined in c++17"
+# endif
+# if __cpp_lib_logical_traits != 201510L
+#   error "__cpp_lib_logical_traits should have the value 201510L in c++17"
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++17"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++17"
+# endif
+
+# ifndef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++17"
+# endif
+# if __cpp_lib_transformation_trait_aliases != 201304L
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should be defined in c++17"
+# endif
+# if __cpp_lib_type_trait_variable_templates != 201510L
+#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++17"
+# endif
+
+# ifndef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should be defined in c++17"
+# endif
+# if __cpp_lib_void_t != 201411L
+#   error "__cpp_lib_void_t should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should be defined in c++2a"
+# endif
+# if __cpp_lib_bool_constant != 201505L
+#   error "__cpp_lib_bool_constant should have the value 201505L in c++2a"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should be defined in c++2a"
+#   endif
+#   if __cpp_lib_has_unique_object_representations != 201606L
+#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should be defined in c++2a"
+# endif
+# if __cpp_lib_integral_constant_callable != 201304L
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++2a"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
+#   ifndef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should be defined in c++2a"
+#   endif
+#   if __cpp_lib_is_aggregate != 201703L
+#     error "__cpp_lib_is_aggregate should have the value 201703L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001 is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_is_constant_evaluated
+#     error "__cpp_lib_is_constant_evaluated should be defined in c++2a"
+#   endif
+#   if __cpp_lib_is_constant_evaluated != 201811L
+#     error "__cpp_lib_is_constant_evaluated should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_is_constant_evaluated
+#     error "__cpp_lib_is_constant_evaluated should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should be defined in c++2a"
+# endif
+# if __cpp_lib_is_final != 201402L
+#   error "__cpp_lib_is_final should have the value 201402L in c++2a"
+# endif
+
+# ifndef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should be defined in c++2a"
+# endif
+# if __cpp_lib_is_invocable != 201703L
+#   error "__cpp_lib_is_invocable should have the value 201703L in c++2a"
+# endif
+
+# ifndef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should be defined in c++2a"
+# endif
+# if __cpp_lib_is_null_pointer != 201309L
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++2a"
+# endif
+
+# ifndef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should be defined in c++2a"
+# endif
+# if __cpp_lib_is_swappable != 201603L
+#   error "__cpp_lib_is_swappable should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should be defined in c++2a"
+# endif
+# if __cpp_lib_logical_traits != 201510L
+#   error "__cpp_lib_logical_traits should have the value 201510L in c++2a"
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++2a"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++2a"
+# endif
+
+# ifndef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++2a"
+# endif
+# if __cpp_lib_transformation_trait_aliases != 201304L
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should be defined in c++2a"
+# endif
+# if __cpp_lib_type_trait_variable_templates != 201510L
+#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++2a"
+# endif
+
+# ifndef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should be defined in c++2a"
+# endif
+# if __cpp_lib_void_t != 201411L
+#   error "__cpp_lib_void_t should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
index d23a91a30..07eb1a9bc 100644
--- a/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
@@ -1,48 +1,170 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <unordered_map> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_node_extract                      201606L
-    __cpp_lib_nonmember_container_access        201411L
-    __cpp_lib_unordered_map_try_emplace         201411L
+// <unordered_map>
 
+// Test the feature test macros defined by <unordered_map>
+
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_generic_unordered_lookup            201811L [C++2a]
+    __cpp_lib_node_extract                        201606L [C++17]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
+    __cpp_lib_unordered_map_try_emplace           201411L [C++17]
 */
 
 #include <unordered_map>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <unordered_map> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
 
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
 # endif
-#endif
 
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++17"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++17"
+# endif
+# if __cpp_lib_unordered_map_try_emplace != 201411L
+#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_generic_unordered_lookup
+#     error "__cpp_lib_generic_unordered_lookup should be defined in c++2a"
+#   endif
+#   if __cpp_lib_generic_unordered_lookup != 201811L
+#     error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_generic_unordered_lookup
+#     error "__cpp_lib_generic_unordered_lookup should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++2a"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++2a"
+# endif
+# if __cpp_lib_unordered_map_try_emplace != 201411L
+#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
index c4dbed14b..845318a79 100644
--- a/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
@@ -1,46 +1,147 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <unordered_set> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_node_extract                      201606L
-    __cpp_lib_nonmember_container_access        201411L
+// <unordered_set>
 
+// Test the feature test macros defined by <unordered_set>
+
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_generic_unordered_lookup            201811L [C++2a]
+    __cpp_lib_node_extract                        201606L [C++17]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
 #include <unordered_set>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <unordered_set> are defined.
-
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++17"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_generic_unordered_lookup
+#     error "__cpp_lib_generic_unordered_lookup should be defined in c++2a"
+#   endif
+#   if __cpp_lib_generic_unordered_lookup != 201811L
+#     error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_generic_unordered_lookup
+#     error "__cpp_lib_generic_unordered_lookup should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++2a"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
index dff687f4b..1fd38627a 100644
--- a/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
@@ -1,36 +1,194 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <utility> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
 
-/*  Constant                                    Value
-    __cpp_lib_as_const                          201510L
-    __cpp_lib_exchange_function                 201304L
-    __cpp_lib_integer_sequence                  201304L
-    __cpp_lib_tuples_by_type                    201304L
+// <utility>
 
+// Test the feature test macros defined by <utility>
+
+/*  Constant                       Value
+    __cpp_lib_as_const             201510L [C++17]
+    __cpp_lib_constexpr_misc       201811L [C++2a]
+    __cpp_lib_exchange_function    201304L [C++14]
+    __cpp_lib_integer_sequence     201304L [C++14]
+    __cpp_lib_to_chars             201611L [C++17]
+    __cpp_lib_tuples_by_type       201304L [C++14]
 */
 
 #include <utility>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <utility> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_to_chars
+#   error "__cpp_lib_to_chars should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should not be defined before c++14"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should be defined in c++14"
+# endif
+# if __cpp_lib_exchange_function != 201304L
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++14"
+# endif
+
+# ifndef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should be defined in c++14"
+# endif
+# if __cpp_lib_integer_sequence != 201304L
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_to_chars
+#   error "__cpp_lib_to_chars should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++14"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++14"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should be defined in c++17"
+# endif
+# if __cpp_lib_as_const != 201510L
+#   error "__cpp_lib_as_const should have the value 201510L in c++17"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should be defined in c++17"
+# endif
+# if __cpp_lib_exchange_function != 201304L
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should be defined in c++17"
+# endif
+# if __cpp_lib_integer_sequence != 201304L
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should be defined in c++17"
+#   endif
+#   if __cpp_lib_to_chars != 201611L
+#     error "__cpp_lib_to_chars should have the value 201611L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++17"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should be defined in c++2a"
+# endif
+# if __cpp_lib_as_const != 201510L
+#   error "__cpp_lib_as_const should have the value 201510L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_misc != 201811L
+#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should be defined in c++2a"
+# endif
+# if __cpp_lib_exchange_function != 201304L
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should be defined in c++2a"
+# endif
+# if __cpp_lib_integer_sequence != 201304L
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should be defined in c++2a"
+#   endif
+#   if __cpp_lib_to_chars != 201611L
+#     error "__cpp_lib_to_chars should have the value 201611L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++2a"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
index 5532e0446..7a1730746 100644
--- a/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
@@ -1,33 +1,55 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <variant> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <variant>
 
-/*  Constant                                    Value
-    __cpp_lib_variant                           201606L
+// Test the feature test macros defined by <variant>
 
+/*  Constant             Value
+    __cpp_lib_variant    201606L [C++17]
 */
 
 #include <variant>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <variant> are defined.
+#if TEST_STD_VER < 14
 
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+# ifdef __cpp_lib_variant
+#   error "__cpp_lib_variant should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_variant
+#   error "__cpp_lib_variant should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_variant
+#   error "__cpp_lib_variant should be defined in c++17"
+# endif
+# if __cpp_lib_variant != 201606L
+#   error "__cpp_lib_variant should have the value 201606L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_variant
+#   error "__cpp_lib_variant should be defined in c++2a"
+# endif
+# if __cpp_lib_variant != 201606L
+#   error "__cpp_lib_variant should have the value 201606L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
index e7cb1942c..3ea2a0cf0 100644
--- a/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
@@ -1,46 +1,121 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <vector> feature macros
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <vector>
 
-/*  Constant                                    Value
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_erase_if                          201811L
-    __cpp_lib_incomplete_container_elements     201505L
-    __cpp_lib_nonmember_container_access        201411L
+// Test the feature test macros defined by <vector>
 
+/*  Constant                                      Value
+    __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
+    __cpp_lib_erase_if                            201811L [C++2a]
+    __cpp_lib_incomplete_container_elements       201505L [C++17]
+    __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
 #include <vector>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <vector> are defined.
-
-#if TEST_STD_VER > 17
-# if !defined(__cpp_lib_erase_if)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_erase_if is not defined");
-# else
-#  if __cpp_lib_erase_if < 201811L
-#   error "__cpp_lib_erase_if has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++17"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++17"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp b/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
index e2179e08a..b85d42d00 100644
--- a/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
+++ b/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
@@ -1,147 +1,2177 @@
-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
-// <version> feature macros
-
-/*  Constant                                    Value
-    __cpp_lib_addressof_constexpr               201603L
-    __cpp_lib_allocator_traits_is_always_equal  201411L
-    __cpp_lib_any                               201606L
-    __cpp_lib_apply                             201603L
-    __cpp_lib_array_constexpr                   201603L
-    __cpp_lib_as_const                          201510L
-    __cpp_lib_atomic_is_always_lock_free        201603L
-    __cpp_lib_atomic_ref                        201806L
-    __cpp_lib_bit_cast                          201806L
-    __cpp_lib_bool_constant                     201505L
-    __cpp_lib_boyer_moore_searcher              201603L
-    __cpp_lib_byte                              201603L
-    __cpp_lib_chrono                            201611L
-    __cpp_lib_chrono_udls                       201304L
-    __cpp_lib_clamp                             201603L
-    __cpp_lib_complex_udls                      201309L
-    __cpp_lib_concepts                          201806L
-    __cpp_lib_constexpr_swap_algorithms         201806L
-    __cpp_lib_enable_shared_from_this           201603L
-    __cpp_lib_exchange_function                 201304L
-    __cpp_lib_execution                         201603L
-    __cpp_lib_filesystem                        201703L
-    __cpp_lib_gcd_lcm                           201606L
-    __cpp_lib_generic_associative_lookup        201304L
-    __cpp_lib_hardware_interference_size        201703L
-    __cpp_lib_has_unique_object_representations 201606L
-    __cpp_lib_hypot                             201603L
-    __cpp_lib_incomplete_container_elements     201505L
-    __cpp_lib_integer_sequence                  201304L
-    __cpp_lib_integral_constant_callable        201304L
-    __cpp_lib_invoke                            201411L
-    __cpp_lib_is_aggregate                      201703L
-    __cpp_lib_is_final                          201402L
-    __cpp_lib_is_invocable                      201703L
-    __cpp_lib_is_null_pointer                   201309L
-    __cpp_lib_is_swappable                      201603L
-    __cpp_lib_launder                           201606L
-    __cpp_lib_list_remove_return_type           201806L
-    __cpp_lib_logical_traits                    201510L
-    __cpp_lib_make_from_tuple                   201606L
-    __cpp_lib_make_reverse_iterator             201402L
-    __cpp_lib_make_unique                       201304L
-    __cpp_lib_map_try_emplace                   201411L
-    __cpp_lib_math_special_functions            201603L
-    __cpp_lib_memory_resource                   201603L
-    __cpp_lib_node_extract                      201606L
-    __cpp_lib_nonmember_container_access        201411L
-    __cpp_lib_not_fn                            201603L
-    __cpp_lib_null_iterators                    201304L
-    __cpp_lib_optional                          201606L
-    __cpp_lib_parallel_algorithm                201603L
-    __cpp_lib_quoted_string_io                  201304L
-    __cpp_lib_raw_memory_algorithms             201606L
-    __cpp_lib_result_of_sfinae                  201210L
-    __cpp_lib_robust_nonmodifying_seq_ops       201304L
-    __cpp_lib_sample                            201603L
-    __cpp_lib_scoped_lock                       201703L
-    __cpp_lib_shared_mutex                      201505L
-    __cpp_lib_shared_ptr_arrays                 201611L
-    __cpp_lib_shared_ptr_weak_type              201606L
-    __cpp_lib_shared_timed_mutex                201402L
-    __cpp_lib_string_udls                       201304L
-    __cpp_lib_string_view                       201606L
-    __cpp_lib_to_chars                          201611L
-    __cpp_lib_transformation_trait_aliases      201304L
-    __cpp_lib_transparent_operators             201510L
-    __cpp_lib_tuple_element_t                   201402L
-    __cpp_lib_tuples_by_type                    201304L
-    __cpp_lib_type_trait_variable_templates     201510L
-    __cpp_lib_uncaught_exceptions               201411L
-    __cpp_lib_unordered_map_try_emplace         201411L
-    __cpp_lib_variant                           201606L
-    __cpp_lib_void_t                            201411L
+// WARNING: This test was generated by generate_feature_test_macro_components.py
+// and should not be edited manually.
+
+// <version>
+
+// Test the feature test macros defined by <version>
 
+/*  Constant                                       Value
+    __cpp_lib_addressof_constexpr                  201603L [C++17]
+    __cpp_lib_allocator_traits_is_always_equal     201411L [C++17]
+    __cpp_lib_any                                  201606L [C++17]
+    __cpp_lib_apply                                201603L [C++17]
+    __cpp_lib_array_constexpr                      201603L [C++17]
+    __cpp_lib_as_const                             201510L [C++17]
+    __cpp_lib_atomic_is_always_lock_free           201603L [C++17]
+    __cpp_lib_atomic_ref                           201806L [C++2a]
+    __cpp_lib_bind_front                           201811L [C++2a]
+    __cpp_lib_bit_cast                             201806L [C++2a]
+    __cpp_lib_bool_constant                        201505L [C++17]
+    __cpp_lib_boyer_moore_searcher                 201603L [C++17]
+    __cpp_lib_byte                                 201603L [C++17]
+    __cpp_lib_char8_t                              201811L [C++2a]
+    __cpp_lib_chrono                               201611L [C++17]
+    __cpp_lib_chrono_udls                          201304L [C++14]
+    __cpp_lib_clamp                                201603L [C++17]
+    __cpp_lib_complex_udls                         201309L [C++14]
+    __cpp_lib_concepts                             201806L [C++2a]
+    __cpp_lib_constexpr_misc                       201811L [C++2a]
+    __cpp_lib_constexpr_swap_algorithms            201806L [C++2a]
+    __cpp_lib_destroying_delete                    201806L [C++2a]
+    __cpp_lib_enable_shared_from_this              201603L [C++17]
+    __cpp_lib_erase_if                             201811L [C++2a]
+    __cpp_lib_exchange_function                    201304L [C++14]
+    __cpp_lib_execution                            201603L [C++17]
+    __cpp_lib_filesystem                           201703L [C++17]
+    __cpp_lib_gcd_lcm                              201606L [C++17]
+    __cpp_lib_generic_associative_lookup           201304L [C++14]
+    __cpp_lib_generic_unordered_lookup             201811L [C++2a]
+    __cpp_lib_hardware_interference_size           201703L [C++17]
+    __cpp_lib_has_unique_object_representations    201606L [C++17]
+    __cpp_lib_hypot                                201603L [C++17]
+    __cpp_lib_incomplete_container_elements        201505L [C++17]
+    __cpp_lib_integer_sequence                     201304L [C++14]
+    __cpp_lib_integral_constant_callable           201304L [C++14]
+    __cpp_lib_invoke                               201411L [C++17]
+    __cpp_lib_is_aggregate                         201703L [C++17]
+    __cpp_lib_is_constant_evaluated                201811L [C++2a]
+    __cpp_lib_is_final                             201402L [C++14]
+    __cpp_lib_is_invocable                         201703L [C++17]
+    __cpp_lib_is_null_pointer                      201309L [C++14]
+    __cpp_lib_is_swappable                         201603L [C++17]
+    __cpp_lib_launder                              201606L [C++17]
+    __cpp_lib_list_remove_return_type              201806L [C++2a]
+    __cpp_lib_logical_traits                       201510L [C++17]
+    __cpp_lib_make_from_tuple                      201606L [C++17]
+    __cpp_lib_make_reverse_iterator                201402L [C++14]
+    __cpp_lib_make_unique                          201304L [C++14]
+    __cpp_lib_map_try_emplace                      201411L [C++17]
+    __cpp_lib_math_special_functions               201603L [C++17]
+    __cpp_lib_memory_resource                      201603L [C++17]
+    __cpp_lib_node_extract                         201606L [C++17]
+    __cpp_lib_nonmember_container_access           201411L [C++17]
+    __cpp_lib_not_fn                               201603L [C++17]
+    __cpp_lib_null_iterators                       201304L [C++14]
+    __cpp_lib_optional                             201606L [C++17]
+    __cpp_lib_parallel_algorithm                   201603L [C++17]
+    __cpp_lib_quoted_string_io                     201304L [C++14]
+    __cpp_lib_ranges                               201811L [C++2a]
+    __cpp_lib_raw_memory_algorithms                201606L [C++17]
+    __cpp_lib_result_of_sfinae                     201210L [C++14]
+    __cpp_lib_robust_nonmodifying_seq_ops          201304L [C++14]
+    __cpp_lib_sample                               201603L [C++17]
+    __cpp_lib_scoped_lock                          201703L [C++17]
+    __cpp_lib_shared_mutex                         201505L [C++17]
+    __cpp_lib_shared_ptr_arrays                    201611L [C++17]
+    __cpp_lib_shared_ptr_weak_type                 201606L [C++17]
+    __cpp_lib_shared_timed_mutex                   201402L [C++14]
+    __cpp_lib_string_udls                          201304L [C++14]
+    __cpp_lib_string_view                          201606L [C++17]
+    __cpp_lib_three_way_comparison                 201711L [C++2a]
+    __cpp_lib_to_chars                             201611L [C++17]
+    __cpp_lib_transformation_trait_aliases         201304L [C++14]
+    __cpp_lib_transparent_operators                201210L [C++14]
+                                                   201510L [C++17]
+    __cpp_lib_tuple_element_t                      201402L [C++14]
+    __cpp_lib_tuples_by_type                       201304L [C++14]
+    __cpp_lib_type_trait_variable_templates        201510L [C++17]
+    __cpp_lib_uncaught_exceptions                  201411L [C++17]
+    __cpp_lib_unordered_map_try_emplace            201411L [C++17]
+    __cpp_lib_variant                              201606L [C++17]
+    __cpp_lib_void_t                               201411L [C++17]
 */
 
 #include <version>
-#include <cassert>
 #include "test_macros.h"
 
-int main()
-{
-//  ensure that the macros that are supposed to be defined in <version> are defined.
+#if TEST_STD_VER < 14
+
+# ifdef __cpp_lib_addressof_constexpr
+#   error "__cpp_lib_addressof_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_any
+#   error "__cpp_lib_any should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_apply
+#   error "__cpp_lib_apply should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_atomic_is_always_lock_free
+#   error "__cpp_lib_atomic_is_always_lock_free should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_atomic_ref
+#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bind_front
+#   error "__cpp_lib_bind_front should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bit_cast
+#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_boyer_moore_searcher
+#   error "__cpp_lib_boyer_moore_searcher should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_byte
+#   error "__cpp_lib_byte should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_concepts
+#   error "__cpp_lib_concepts should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_swap_algorithms
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_destroying_delete
+#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_execution
+#   error "__cpp_lib_execution should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_has_unique_object_representations
+#   error "__cpp_lib_has_unique_object_representations should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_aggregate
+#   error "__cpp_lib_is_aggregate should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_constant_evaluated
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_launder
+#   error "__cpp_lib_launder should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_math_special_functions
+#   error "__cpp_lib_math_special_functions should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_memory_resource
+#   error "__cpp_lib_memory_resource should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_optional
+#   error "__cpp_lib_optional should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_parallel_algorithm
+#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_sample
+#   error "__cpp_lib_sample should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_mutex
+#   error "__cpp_lib_shared_mutex should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_ptr_arrays
+#   error "__cpp_lib_shared_ptr_arrays should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_timed_mutex
+#   error "__cpp_lib_shared_timed_mutex should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_three_way_comparison
+#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_to_chars
+#   error "__cpp_lib_to_chars should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should not be defined before c++14"
+# endif
+
+# ifdef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_variant
+#   error "__cpp_lib_variant should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 14
+
+# ifdef __cpp_lib_addressof_constexpr
+#   error "__cpp_lib_addressof_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_any
+#   error "__cpp_lib_any should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_apply
+#   error "__cpp_lib_apply should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_atomic_is_always_lock_free
+#   error "__cpp_lib_atomic_is_always_lock_free should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_atomic_ref
+#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bind_front
+#   error "__cpp_lib_bind_front should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bit_cast
+#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_boyer_moore_searcher
+#   error "__cpp_lib_boyer_moore_searcher should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_byte
+#   error "__cpp_lib_byte should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should be defined in c++14"
+# endif
+# if __cpp_lib_chrono_udls != 201304L
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should be defined in c++14"
+# endif
+# if __cpp_lib_complex_udls != 201309L
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++14"
+# endif
+
+# ifdef __cpp_lib_concepts
+#   error "__cpp_lib_concepts should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_swap_algorithms
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_destroying_delete
+#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should be defined in c++14"
+# endif
+# if __cpp_lib_exchange_function != 201304L
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_execution
+#   error "__cpp_lib_execution should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++14"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_has_unique_object_representations
+#   error "__cpp_lib_has_unique_object_representations should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should be defined in c++14"
+# endif
+# if __cpp_lib_integer_sequence != 201304L
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++14"
+# endif
+
+# ifndef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should be defined in c++14"
+# endif
+# if __cpp_lib_integral_constant_callable != 201304L
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_aggregate
+#   error "__cpp_lib_is_aggregate should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_is_constant_evaluated
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should be defined in c++14"
+# endif
+# if __cpp_lib_is_final != 201402L
+#   error "__cpp_lib_is_final should have the value 201402L in c++14"
+# endif
+
+# ifdef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should be defined in c++14"
+# endif
+# if __cpp_lib_is_null_pointer != 201309L
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++14"
+# endif
+
+# ifdef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_launder
+#   error "__cpp_lib_launder should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++14"
+# endif
+# if __cpp_lib_make_reverse_iterator != 201402L
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++14"
+# endif
+
+# ifndef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should be defined in c++14"
+# endif
+# if __cpp_lib_make_unique != 201304L
+#   error "__cpp_lib_make_unique should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_math_special_functions
+#   error "__cpp_lib_math_special_functions should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_memory_resource
+#   error "__cpp_lib_memory_resource should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should be defined in c++14"
+# endif
+# if __cpp_lib_null_iterators != 201304L
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_optional
+#   error "__cpp_lib_optional should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_parallel_algorithm
+#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should be defined in c++14"
+# endif
+# if __cpp_lib_quoted_string_io != 201304L
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should not be defined before c++17"
+# endif
 
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_atomic_is_always_lock_free)
-#  error "__cpp_lib_atomic_is_always_lock_free is not defined"
-# elif __cpp_lib_atomic_is_always_lock_free < 201603L
-#  error "__cpp_lib_atomic_is_always_lock_free has an invalid value"
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++14"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++14"
+# endif
+
+# ifndef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++14"
+# endif
+# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++14"
 # endif
-#endif
 
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_filesystem)
-#  error "__cpp_lib_filesystem is not defined"
-# elif __cpp_lib_filesystem < 201703L
-#  error "__cpp_lib_filesystem has an invalid value"
+# ifdef __cpp_lib_sample
+#   error "__cpp_lib_sample should not be defined before c++17"
 # endif
-#endif
 
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_invoke)
-#  error "__cpp_lib_invoke is not defined"
-# elif __cpp_lib_invoke < 201411L
-#  error "__cpp_lib_invoke has an invalid value"
+# ifdef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should not be defined before c++17"
 # endif
-#endif
 
-#if TEST_STD_VER > 14
-# if !defined(__cpp_lib_void_t)
-#  error "__cpp_lib_void_t is not defined"
-# elif __cpp_lib_void_t < 201411L
-#  error "__cpp_lib_void_t has an invalid value"
+# ifdef __cpp_lib_shared_mutex
+#   error "__cpp_lib_shared_mutex should not be defined before c++17"
 # endif
-#endif
 
-#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
-# if !defined(__cpp_lib_char8_t)  
-  LIBCPP_STATIC_ASSERT(false, "__cpp_lib_char8_t is not defined");
+# ifdef __cpp_lib_shared_ptr_arrays
+#   error "__cpp_lib_shared_ptr_arrays should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should not be defined before c++17"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++14"
+#   endif
+#   if __cpp_lib_shared_timed_mutex != 201402L
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++14"
+#   endif
 # else
-#  if __cpp_lib_char8_t < 201811L
-#   error "__cpp_lib_char8_t has an invalid value"
-#  endif
-# endif
-#endif
-
-/*
-#if !defined(__cpp_lib_fooby)
-# error "__cpp_lib_fooby is not defined"
-#elif __cpp_lib_fooby < 201606L
-# error "__cpp_lib_fooby has an invalid value"
-#endif
-*/
-}
+#   ifdef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should be defined in c++14"
+# endif
+# if __cpp_lib_string_udls != 201304L
+#   error "__cpp_lib_string_udls should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_three_way_comparison
+#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_to_chars
+#   error "__cpp_lib_to_chars should not be defined before c++17"
+# endif
+
+# ifndef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++14"
+# endif
+# if __cpp_lib_transformation_trait_aliases != 201304L
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++14"
+# endif
+
+# ifndef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should be defined in c++14"
+# endif
+# if __cpp_lib_transparent_operators != 201210L
+#   error "__cpp_lib_transparent_operators should have the value 201210L in c++14"
+# endif
+
+# ifndef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should be defined in c++14"
+# endif
+# if __cpp_lib_tuple_element_t != 201402L
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++14"
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++14"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++14"
+# endif
+
+# ifdef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_variant
+#   error "__cpp_lib_variant should not be defined before c++17"
+# endif
+
+# ifdef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should not be defined before c++17"
+# endif
+
+#elif TEST_STD_VER == 17
+
+# if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should be defined in c++17"
+#   endif
+#   if __cpp_lib_addressof_constexpr != 201603L
+#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should not be defined when TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_any
+#   error "__cpp_lib_any should be defined in c++17"
+# endif
+# if __cpp_lib_any != 201606L
+#   error "__cpp_lib_any should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_apply
+#   error "__cpp_lib_apply should be defined in c++17"
+# endif
+# if __cpp_lib_apply != 201603L
+#   error "__cpp_lib_apply should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should be defined in c++17"
+# endif
+# if __cpp_lib_array_constexpr != 201603L
+#   error "__cpp_lib_array_constexpr should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should be defined in c++17"
+# endif
+# if __cpp_lib_as_const != 201510L
+#   error "__cpp_lib_as_const should have the value 201510L in c++17"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++17"
+#   endif
+#   if __cpp_lib_atomic_is_always_lock_free != 201603L
+#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# ifdef __cpp_lib_atomic_ref
+#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bind_front
+#   error "__cpp_lib_bind_front should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_bit_cast
+#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should be defined in c++17"
+# endif
+# if __cpp_lib_bool_constant != 201505L
+#   error "__cpp_lib_bool_constant should have the value 201505L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should be defined in c++17"
+#   endif
+#   if __cpp_lib_boyer_moore_searcher != 201603L
+#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_byte
+#   error "__cpp_lib_byte should be defined in c++17"
+# endif
+# if __cpp_lib_byte != 201603L
+#   error "__cpp_lib_byte should have the value 201603L in c++17"
+# endif
+
+# ifdef __cpp_lib_char8_t
+#   error "__cpp_lib_char8_t should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should be defined in c++17"
+# endif
+# if __cpp_lib_chrono != 201611L
+#   error "__cpp_lib_chrono should have the value 201611L in c++17"
+# endif
+
+# ifndef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should be defined in c++17"
+# endif
+# if __cpp_lib_chrono_udls != 201304L
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should be defined in c++17"
+# endif
+# if __cpp_lib_clamp != 201603L
+#   error "__cpp_lib_clamp should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should be defined in c++17"
+# endif
+# if __cpp_lib_complex_udls != 201309L
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++17"
+# endif
+
+# ifdef __cpp_lib_concepts
+#   error "__cpp_lib_concepts should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_misc
+#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_constexpr_swap_algorithms
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+# endif
+
+# ifdef __cpp_lib_destroying_delete
+#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should be defined in c++17"
+# endif
+# if __cpp_lib_enable_shared_from_this != 201603L
+#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++17"
+# endif
+
+# ifdef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should be defined in c++17"
+# endif
+# if __cpp_lib_exchange_function != 201304L
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_execution
+#     error "__cpp_lib_execution should be defined in c++17"
+#   endif
+#   if __cpp_lib_execution != 201603L
+#     error "__cpp_lib_execution should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_execution
+#     error "__cpp_lib_execution should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should be defined in c++17"
+# endif
+# if __cpp_lib_filesystem != 201703L
+#   error "__cpp_lib_filesystem should have the value 201703L in c++17"
+# endif
+
+# ifndef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should be defined in c++17"
+# endif
+# if __cpp_lib_gcd_lcm != 201606L
+#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++17"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++17"
+# endif
+
+# ifdef __cpp_lib_generic_unordered_lookup
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should be defined in c++17"
+# endif
+# if __cpp_lib_hardware_interference_size != 201703L
+#   error "__cpp_lib_hardware_interference_size should have the value 201703L in c++17"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should be defined in c++17"
+#   endif
+#   if __cpp_lib_has_unique_object_representations != 201606L
+#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should be defined in c++17"
+# endif
+# if __cpp_lib_hypot != 201603L
+#   error "__cpp_lib_hypot should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++17"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++17"
+# endif
+
+# ifndef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should be defined in c++17"
+# endif
+# if __cpp_lib_integer_sequence != 201304L
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should be defined in c++17"
+# endif
+# if __cpp_lib_integral_constant_callable != 201304L
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should be defined in c++17"
+# endif
+# if __cpp_lib_invoke != 201411L
+#   error "__cpp_lib_invoke should have the value 201411L in c++17"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
+#   ifndef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should be defined in c++17"
+#   endif
+#   if __cpp_lib_is_aggregate != 201703L
+#     error "__cpp_lib_is_aggregate should have the value 201703L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001 is not defined!"
+#   endif
+# endif
+
+# ifdef __cpp_lib_is_constant_evaluated
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should be defined in c++17"
+# endif
+# if __cpp_lib_is_final != 201402L
+#   error "__cpp_lib_is_final should have the value 201402L in c++17"
+# endif
+
+# ifndef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should be defined in c++17"
+# endif
+# if __cpp_lib_is_invocable != 201703L
+#   error "__cpp_lib_is_invocable should have the value 201703L in c++17"
+# endif
+
+# ifndef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should be defined in c++17"
+# endif
+# if __cpp_lib_is_null_pointer != 201309L
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++17"
+# endif
+
+# ifndef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should be defined in c++17"
+# endif
+# if __cpp_lib_is_swappable != 201603L
+#   error "__cpp_lib_is_swappable should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_launder
+#   error "__cpp_lib_launder should be defined in c++17"
+# endif
+# if __cpp_lib_launder != 201606L
+#   error "__cpp_lib_launder should have the value 201606L in c++17"
+# endif
+
+# ifdef __cpp_lib_list_remove_return_type
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should be defined in c++17"
+# endif
+# if __cpp_lib_logical_traits != 201510L
+#   error "__cpp_lib_logical_traits should have the value 201510L in c++17"
+# endif
+
+# ifndef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should be defined in c++17"
+# endif
+# if __cpp_lib_make_from_tuple != 201606L
+#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++17"
+# endif
+# if __cpp_lib_make_reverse_iterator != 201402L
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++17"
+# endif
+
+# ifndef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should be defined in c++17"
+# endif
+# if __cpp_lib_make_unique != 201304L
+#   error "__cpp_lib_make_unique should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should be defined in c++17"
+# endif
+# if __cpp_lib_map_try_emplace != 201411L
+#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should be defined in c++17"
+#   endif
+#   if __cpp_lib_math_special_functions != 201603L
+#     error "__cpp_lib_math_special_functions should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_memory_resource
+#     error "__cpp_lib_memory_resource should be defined in c++17"
+#   endif
+#   if __cpp_lib_memory_resource != 201603L
+#     error "__cpp_lib_memory_resource should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_memory_resource
+#     error "__cpp_lib_memory_resource should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++17"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should be defined in c++17"
+# endif
+# if __cpp_lib_not_fn != 201603L
+#   error "__cpp_lib_not_fn should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should be defined in c++17"
+# endif
+# if __cpp_lib_null_iterators != 201304L
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_optional
+#   error "__cpp_lib_optional should be defined in c++17"
+# endif
+# if __cpp_lib_optional != 201606L
+#   error "__cpp_lib_optional should have the value 201606L in c++17"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should be defined in c++17"
+#   endif
+#   if __cpp_lib_parallel_algorithm != 201603L
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should be defined in c++17"
+# endif
+# if __cpp_lib_quoted_string_io != 201304L
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++17"
+# endif
+
+# ifdef __cpp_lib_ranges
+#   error "__cpp_lib_ranges should not be defined before c++2a"
+# endif
+
+# ifndef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should be defined in c++17"
+# endif
+# if __cpp_lib_raw_memory_algorithms != 201606L
+#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++17"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++17"
+# endif
+
+# ifndef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++17"
+# endif
+# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_sample
+#   error "__cpp_lib_sample should be defined in c++17"
+# endif
+# if __cpp_lib_sample != 201603L
+#   error "__cpp_lib_sample should have the value 201603L in c++17"
+# endif
+
+# ifndef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should be defined in c++17"
+# endif
+# if __cpp_lib_scoped_lock != 201703L
+#   error "__cpp_lib_scoped_lock should have the value 201703L in c++17"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should be defined in c++17"
+#   endif
+#   if __cpp_lib_shared_mutex != 201505L
+#     error "__cpp_lib_shared_mutex should have the value 201505L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should be defined in c++17"
+#   endif
+#   if __cpp_lib_shared_ptr_arrays != 201611L
+#     error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++17"
+# endif
+# if __cpp_lib_shared_ptr_weak_type != 201606L
+#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++17"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++17"
+#   endif
+#   if __cpp_lib_shared_timed_mutex != 201402L
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++17"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should be defined in c++17"
+# endif
+# if __cpp_lib_string_udls != 201304L
+#   error "__cpp_lib_string_udls should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should be defined in c++17"
+# endif
+# if __cpp_lib_string_view != 201606L
+#   error "__cpp_lib_string_view should have the value 201606L in c++17"
+# endif
+
+# ifdef __cpp_lib_three_way_comparison
+#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should be defined in c++17"
+#   endif
+#   if __cpp_lib_to_chars != 201611L
+#     error "__cpp_lib_to_chars should have the value 201611L in c++17"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++17"
+# endif
+# if __cpp_lib_transformation_trait_aliases != 201304L
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should be defined in c++17"
+# endif
+# if __cpp_lib_transparent_operators != 201510L
+#   error "__cpp_lib_transparent_operators should have the value 201510L in c++17"
+# endif
+
+# ifndef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should be defined in c++17"
+# endif
+# if __cpp_lib_tuple_element_t != 201402L
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++17"
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++17"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++17"
+# endif
+
+# ifndef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should be defined in c++17"
+# endif
+# if __cpp_lib_type_trait_variable_templates != 201510L
+#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++17"
+# endif
+
+# ifndef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should be defined in c++17"
+# endif
+# if __cpp_lib_uncaught_exceptions != 201411L
+#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++17"
+# endif
+# if __cpp_lib_unordered_map_try_emplace != 201411L
+#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++17"
+# endif
+
+# ifndef __cpp_lib_variant
+#   error "__cpp_lib_variant should be defined in c++17"
+# endif
+# if __cpp_lib_variant != 201606L
+#   error "__cpp_lib_variant should have the value 201606L in c++17"
+# endif
+
+# ifndef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should be defined in c++17"
+# endif
+# if __cpp_lib_void_t != 201411L
+#   error "__cpp_lib_void_t should have the value 201411L in c++17"
+# endif
+
+#elif TEST_STD_VER > 17
+
+# if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should be defined in c++2a"
+#   endif
+#   if __cpp_lib_addressof_constexpr != 201603L
+#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_addressof_constexpr
+#     error "__cpp_lib_addressof_constexpr should not be defined when TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_allocator_traits_is_always_equal
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+# endif
+# if __cpp_lib_allocator_traits_is_always_equal != 201411L
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_any
+#   error "__cpp_lib_any should be defined in c++2a"
+# endif
+# if __cpp_lib_any != 201606L
+#   error "__cpp_lib_any should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_apply
+#   error "__cpp_lib_apply should be defined in c++2a"
+# endif
+# if __cpp_lib_apply != 201603L
+#   error "__cpp_lib_apply should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_array_constexpr
+#   error "__cpp_lib_array_constexpr should be defined in c++2a"
+# endif
+# if __cpp_lib_array_constexpr != 201603L
+#   error "__cpp_lib_array_constexpr should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_as_const
+#   error "__cpp_lib_as_const should be defined in c++2a"
+# endif
+# if __cpp_lib_as_const != 201510L
+#   error "__cpp_lib_as_const should have the value 201510L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++2a"
+#   endif
+#   if __cpp_lib_atomic_is_always_lock_free != 201603L
+#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_atomic_is_always_lock_free
+#     error "__cpp_lib_atomic_is_always_lock_free should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_atomic_ref
+#     error "__cpp_lib_atomic_ref should be defined in c++2a"
+#   endif
+#   if __cpp_lib_atomic_ref != 201806L
+#     error "__cpp_lib_atomic_ref should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_atomic_ref
+#     error "__cpp_lib_atomic_ref should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_bind_front
+#     error "__cpp_lib_bind_front should be defined in c++2a"
+#   endif
+#   if __cpp_lib_bind_front != 201811L
+#     error "__cpp_lib_bind_front should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_bind_front
+#     error "__cpp_lib_bind_front should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_bit_cast
+#     error "__cpp_lib_bit_cast should be defined in c++2a"
+#   endif
+#   if __cpp_lib_bit_cast != 201806L
+#     error "__cpp_lib_bit_cast should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_bit_cast
+#     error "__cpp_lib_bit_cast should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_bool_constant
+#   error "__cpp_lib_bool_constant should be defined in c++2a"
+# endif
+# if __cpp_lib_bool_constant != 201505L
+#   error "__cpp_lib_bool_constant should have the value 201505L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should be defined in c++2a"
+#   endif
+#   if __cpp_lib_boyer_moore_searcher != 201603L
+#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_boyer_moore_searcher
+#     error "__cpp_lib_boyer_moore_searcher should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_byte
+#   error "__cpp_lib_byte should be defined in c++2a"
+# endif
+# if __cpp_lib_byte != 201603L
+#   error "__cpp_lib_byte should have the value 201603L in c++2a"
+# endif
+
+# if defined(__cpp_char8_t)
+#   ifndef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should be defined in c++2a"
+#   endif
+#   if __cpp_lib_char8_t != 201811L
+#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_char8_t
+#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_chrono
+#   error "__cpp_lib_chrono should be defined in c++2a"
+# endif
+# if __cpp_lib_chrono != 201611L
+#   error "__cpp_lib_chrono should have the value 201611L in c++2a"
+# endif
+
+# ifndef __cpp_lib_chrono_udls
+#   error "__cpp_lib_chrono_udls should be defined in c++2a"
+# endif
+# if __cpp_lib_chrono_udls != 201304L
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_clamp
+#   error "__cpp_lib_clamp should be defined in c++2a"
+# endif
+# if __cpp_lib_clamp != 201603L
+#   error "__cpp_lib_clamp should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_complex_udls
+#   error "__cpp_lib_complex_udls should be defined in c++2a"
+# endif
+# if __cpp_lib_complex_udls != 201309L
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_concepts
+#     error "__cpp_lib_concepts should be defined in c++2a"
+#   endif
+#   if __cpp_lib_concepts != 201806L
+#     error "__cpp_lib_concepts should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_concepts
+#     error "__cpp_lib_concepts should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_misc != 201811L
+#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_misc
+#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_constexpr_swap_algorithms
+#     error "__cpp_lib_constexpr_swap_algorithms should be defined in c++2a"
+#   endif
+#   if __cpp_lib_constexpr_swap_algorithms != 201806L
+#     error "__cpp_lib_constexpr_swap_algorithms should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_constexpr_swap_algorithms
+#     error "__cpp_lib_constexpr_swap_algorithms should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_destroying_delete
+#     error "__cpp_lib_destroying_delete should be defined in c++2a"
+#   endif
+#   if __cpp_lib_destroying_delete != 201806L
+#     error "__cpp_lib_destroying_delete should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_destroying_delete
+#     error "__cpp_lib_destroying_delete should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_enable_shared_from_this
+#   error "__cpp_lib_enable_shared_from_this should be defined in c++2a"
+# endif
+# if __cpp_lib_enable_shared_from_this != 201603L
+#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_erase_if
+#   error "__cpp_lib_erase_if should be defined in c++2a"
+# endif
+# if __cpp_lib_erase_if != 201811L
+#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
+# endif
+
+# ifndef __cpp_lib_exchange_function
+#   error "__cpp_lib_exchange_function should be defined in c++2a"
+# endif
+# if __cpp_lib_exchange_function != 201304L
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_execution
+#     error "__cpp_lib_execution should be defined in c++2a"
+#   endif
+#   if __cpp_lib_execution != 201603L
+#     error "__cpp_lib_execution should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_execution
+#     error "__cpp_lib_execution should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_filesystem
+#   error "__cpp_lib_filesystem should be defined in c++2a"
+# endif
+# if __cpp_lib_filesystem != 201703L
+#   error "__cpp_lib_filesystem should have the value 201703L in c++2a"
+# endif
+
+# ifndef __cpp_lib_gcd_lcm
+#   error "__cpp_lib_gcd_lcm should be defined in c++2a"
+# endif
+# if __cpp_lib_gcd_lcm != 201606L
+#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_generic_associative_lookup
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++2a"
+# endif
+# if __cpp_lib_generic_associative_lookup != 201304L
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_generic_unordered_lookup
+#     error "__cpp_lib_generic_unordered_lookup should be defined in c++2a"
+#   endif
+#   if __cpp_lib_generic_unordered_lookup != 201811L
+#     error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_generic_unordered_lookup
+#     error "__cpp_lib_generic_unordered_lookup should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_hardware_interference_size
+#   error "__cpp_lib_hardware_interference_size should be defined in c++2a"
+# endif
+# if __cpp_lib_hardware_interference_size != 201703L
+#   error "__cpp_lib_hardware_interference_size should have the value 201703L in c++2a"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
+#   ifndef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should be defined in c++2a"
+#   endif
+#   if __cpp_lib_has_unique_object_representations != 201606L
+#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_has_unique_object_representations
+#     error "__cpp_lib_has_unique_object_representations should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700 is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_hypot
+#   error "__cpp_lib_hypot should be defined in c++2a"
+# endif
+# if __cpp_lib_hypot != 201603L
+#   error "__cpp_lib_hypot should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_incomplete_container_elements
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+# endif
+# if __cpp_lib_incomplete_container_elements != 201505L
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+# endif
+
+# ifndef __cpp_lib_integer_sequence
+#   error "__cpp_lib_integer_sequence should be defined in c++2a"
+# endif
+# if __cpp_lib_integer_sequence != 201304L
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_integral_constant_callable
+#   error "__cpp_lib_integral_constant_callable should be defined in c++2a"
+# endif
+# if __cpp_lib_integral_constant_callable != 201304L
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_invoke
+#   error "__cpp_lib_invoke should be defined in c++2a"
+# endif
+# if __cpp_lib_invoke != 201411L
+#   error "__cpp_lib_invoke should have the value 201411L in c++2a"
+# endif
+
+# if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
+#   ifndef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should be defined in c++2a"
+#   endif
+#   if __cpp_lib_is_aggregate != 201703L
+#     error "__cpp_lib_is_aggregate should have the value 201703L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_is_aggregate
+#     error "__cpp_lib_is_aggregate should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001 is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_is_constant_evaluated
+#     error "__cpp_lib_is_constant_evaluated should be defined in c++2a"
+#   endif
+#   if __cpp_lib_is_constant_evaluated != 201811L
+#     error "__cpp_lib_is_constant_evaluated should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_is_constant_evaluated
+#     error "__cpp_lib_is_constant_evaluated should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_is_final
+#   error "__cpp_lib_is_final should be defined in c++2a"
+# endif
+# if __cpp_lib_is_final != 201402L
+#   error "__cpp_lib_is_final should have the value 201402L in c++2a"
+# endif
+
+# ifndef __cpp_lib_is_invocable
+#   error "__cpp_lib_is_invocable should be defined in c++2a"
+# endif
+# if __cpp_lib_is_invocable != 201703L
+#   error "__cpp_lib_is_invocable should have the value 201703L in c++2a"
+# endif
+
+# ifndef __cpp_lib_is_null_pointer
+#   error "__cpp_lib_is_null_pointer should be defined in c++2a"
+# endif
+# if __cpp_lib_is_null_pointer != 201309L
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++2a"
+# endif
+
+# ifndef __cpp_lib_is_swappable
+#   error "__cpp_lib_is_swappable should be defined in c++2a"
+# endif
+# if __cpp_lib_is_swappable != 201603L
+#   error "__cpp_lib_is_swappable should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_launder
+#   error "__cpp_lib_launder should be defined in c++2a"
+# endif
+# if __cpp_lib_launder != 201606L
+#   error "__cpp_lib_launder should have the value 201606L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_list_remove_return_type
+#     error "__cpp_lib_list_remove_return_type should be defined in c++2a"
+#   endif
+#   if __cpp_lib_list_remove_return_type != 201806L
+#     error "__cpp_lib_list_remove_return_type should have the value 201806L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_list_remove_return_type
+#     error "__cpp_lib_list_remove_return_type should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_logical_traits
+#   error "__cpp_lib_logical_traits should be defined in c++2a"
+# endif
+# if __cpp_lib_logical_traits != 201510L
+#   error "__cpp_lib_logical_traits should have the value 201510L in c++2a"
+# endif
+
+# ifndef __cpp_lib_make_from_tuple
+#   error "__cpp_lib_make_from_tuple should be defined in c++2a"
+# endif
+# if __cpp_lib_make_from_tuple != 201606L
+#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_make_reverse_iterator
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++2a"
+# endif
+# if __cpp_lib_make_reverse_iterator != 201402L
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++2a"
+# endif
+
+# ifndef __cpp_lib_make_unique
+#   error "__cpp_lib_make_unique should be defined in c++2a"
+# endif
+# if __cpp_lib_make_unique != 201304L
+#   error "__cpp_lib_make_unique should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_map_try_emplace
+#   error "__cpp_lib_map_try_emplace should be defined in c++2a"
+# endif
+# if __cpp_lib_map_try_emplace != 201411L
+#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should be defined in c++2a"
+#   endif
+#   if __cpp_lib_math_special_functions != 201603L
+#     error "__cpp_lib_math_special_functions should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_math_special_functions
+#     error "__cpp_lib_math_special_functions should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_memory_resource
+#     error "__cpp_lib_memory_resource should be defined in c++2a"
+#   endif
+#   if __cpp_lib_memory_resource != 201603L
+#     error "__cpp_lib_memory_resource should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_memory_resource
+#     error "__cpp_lib_memory_resource should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_node_extract
+#   error "__cpp_lib_node_extract should be defined in c++2a"
+# endif
+# if __cpp_lib_node_extract != 201606L
+#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_nonmember_container_access
+#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+# endif
+# if __cpp_lib_nonmember_container_access != 201411L
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_not_fn
+#   error "__cpp_lib_not_fn should be defined in c++2a"
+# endif
+# if __cpp_lib_not_fn != 201603L
+#   error "__cpp_lib_not_fn should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_null_iterators
+#   error "__cpp_lib_null_iterators should be defined in c++2a"
+# endif
+# if __cpp_lib_null_iterators != 201304L
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_optional
+#   error "__cpp_lib_optional should be defined in c++2a"
+# endif
+# if __cpp_lib_optional != 201606L
+#   error "__cpp_lib_optional should have the value 201606L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should be defined in c++2a"
+#   endif
+#   if __cpp_lib_parallel_algorithm != 201603L
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_parallel_algorithm
+#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_quoted_string_io
+#   error "__cpp_lib_quoted_string_io should be defined in c++2a"
+# endif
+# if __cpp_lib_quoted_string_io != 201304L
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should be defined in c++2a"
+#   endif
+#   if __cpp_lib_ranges != 201811L
+#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_ranges
+#     error "__cpp_lib_ranges should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_raw_memory_algorithms
+#   error "__cpp_lib_raw_memory_algorithms should be defined in c++2a"
+# endif
+# if __cpp_lib_raw_memory_algorithms != 201606L
+#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_result_of_sfinae
+#   error "__cpp_lib_result_of_sfinae should be defined in c++2a"
+# endif
+# if __cpp_lib_result_of_sfinae != 201210L
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++2a"
+# endif
+
+# ifndef __cpp_lib_robust_nonmodifying_seq_ops
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++2a"
+# endif
+# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_sample
+#   error "__cpp_lib_sample should be defined in c++2a"
+# endif
+# if __cpp_lib_sample != 201603L
+#   error "__cpp_lib_sample should have the value 201603L in c++2a"
+# endif
+
+# ifndef __cpp_lib_scoped_lock
+#   error "__cpp_lib_scoped_lock should be defined in c++2a"
+# endif
+# if __cpp_lib_scoped_lock != 201703L
+#   error "__cpp_lib_scoped_lock should have the value 201703L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should be defined in c++2a"
+#   endif
+#   if __cpp_lib_shared_mutex != 201505L
+#     error "__cpp_lib_shared_mutex should have the value 201505L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_mutex
+#     error "__cpp_lib_shared_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should be defined in c++2a"
+#   endif
+#   if __cpp_lib_shared_ptr_arrays != 201611L
+#     error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_shared_ptr_arrays
+#     error "__cpp_lib_shared_ptr_arrays should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_shared_ptr_weak_type
+#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++2a"
+# endif
+# if __cpp_lib_shared_ptr_weak_type != 201606L
+#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_THREADS)
+#   ifndef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++2a"
+#   endif
+#   if __cpp_lib_shared_timed_mutex != 201402L
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++2a"
+#   endif
+# else
+#   ifdef __cpp_lib_shared_timed_mutex
+#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_string_udls
+#   error "__cpp_lib_string_udls should be defined in c++2a"
+# endif
+# if __cpp_lib_string_udls != 201304L
+#   error "__cpp_lib_string_udls should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_string_view
+#   error "__cpp_lib_string_view should be defined in c++2a"
+# endif
+# if __cpp_lib_string_view != 201606L
+#   error "__cpp_lib_string_view should have the value 201606L in c++2a"
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_three_way_comparison
+#     error "__cpp_lib_three_way_comparison should be defined in c++2a"
+#   endif
+#   if __cpp_lib_three_way_comparison != 201711L
+#     error "__cpp_lib_three_way_comparison should have the value 201711L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_three_way_comparison
+#     error "__cpp_lib_three_way_comparison should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# if !defined(_LIBCPP_VERSION)
+#   ifndef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should be defined in c++2a"
+#   endif
+#   if __cpp_lib_to_chars != 201611L
+#     error "__cpp_lib_to_chars should have the value 201611L in c++2a"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef __cpp_lib_to_chars
+#     error "__cpp_lib_to_chars should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+
+# ifndef __cpp_lib_transformation_trait_aliases
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++2a"
+# endif
+# if __cpp_lib_transformation_trait_aliases != 201304L
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_transparent_operators
+#   error "__cpp_lib_transparent_operators should be defined in c++2a"
+# endif
+# if __cpp_lib_transparent_operators != 201510L
+#   error "__cpp_lib_transparent_operators should have the value 201510L in c++2a"
+# endif
+
+# ifndef __cpp_lib_tuple_element_t
+#   error "__cpp_lib_tuple_element_t should be defined in c++2a"
+# endif
+# if __cpp_lib_tuple_element_t != 201402L
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++2a"
+# endif
+
+# ifndef __cpp_lib_tuples_by_type
+#   error "__cpp_lib_tuples_by_type should be defined in c++2a"
+# endif
+# if __cpp_lib_tuples_by_type != 201304L
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++2a"
+# endif
+
+# ifndef __cpp_lib_type_trait_variable_templates
+#   error "__cpp_lib_type_trait_variable_templates should be defined in c++2a"
+# endif
+# if __cpp_lib_type_trait_variable_templates != 201510L
+#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++2a"
+# endif
+
+# ifndef __cpp_lib_uncaught_exceptions
+#   error "__cpp_lib_uncaught_exceptions should be defined in c++2a"
+# endif
+# if __cpp_lib_uncaught_exceptions != 201411L
+#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_unordered_map_try_emplace
+#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++2a"
+# endif
+# if __cpp_lib_unordered_map_try_emplace != 201411L
+#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++2a"
+# endif
+
+# ifndef __cpp_lib_variant
+#   error "__cpp_lib_variant should be defined in c++2a"
+# endif
+# if __cpp_lib_variant != 201606L
+#   error "__cpp_lib_variant should have the value 201606L in c++2a"
+# endif
+
+# ifndef __cpp_lib_void_t
+#   error "__cpp_lib_void_t should be defined in c++2a"
+# endif
+# if __cpp_lib_void_t != 201411L
+#   error "__cpp_lib_void_t should have the value 201411L in c++2a"
+# endif
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) { return 0; }
diff --git a/test/std/language.support/support.limits/version.pass.cpp b/test/std/language.support/support.limits/version.pass.cpp
index c41f492bb..783af5c72 100644
--- a/test/std/language.support/support.limits/version.pass.cpp
+++ b/test/std/language.support/support.limits/version.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,6 +11,8 @@
 
 #include <version>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.rtti/bad.cast/bad_cast.pass.cpp b/test/std/language.support/support.rtti/bad.cast/bad_cast.pass.cpp
index 448ffba2c..23afd223c 100644
--- a/test/std/language.support/support.rtti/bad.cast/bad_cast.pass.cpp
+++ b/test/std/language.support/support.rtti/bad.cast/bad_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::bad_cast>::value),
                  "std::is_base_of<std::exception, std::bad_cast>::value");
@@ -24,4 +23,6 @@ int main()
     b2 = b;
     const char* w = b2.what();
     assert(w);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.rtti/bad.typeid/bad_typeid.pass.cpp b/test/std/language.support/support.rtti/bad.typeid/bad_typeid.pass.cpp
index 190aebe54..94424bb03 100644
--- a/test/std/language.support/support.rtti/bad.typeid/bad_typeid.pass.cpp
+++ b/test/std/language.support/support.rtti/bad.typeid/bad_typeid.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::bad_typeid>::value),
                  "std::is_base_of<std::exception, std::bad_typeid>::value");
@@ -24,4 +23,6 @@ int main()
     b2 = b;
     const char* w = b2.what();
     assert(w);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.rtti/type.info/type_info.pass.cpp b/test/std/language.support/support.rtti/type.info/type_info.pass.cpp
index 74c1c0c7d..980bfeecc 100644
--- a/test/std/language.support/support.rtti/type.info/type_info.pass.cpp
+++ b/test/std/language.support/support.rtti/type.info/type_info.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 bool test_constructor_explicit(std::type_info const&) { return false; }
 bool test_constructor_explicit(std::string const&) { return true; }
 
-int main()
+int main(int, char**)
 {
   {
     const std::type_info& t1 = typeid(int);
@@ -26,8 +25,8 @@ int main()
     const std::type_info& t3 = typeid(short);
     assert(t1 != t3);
     assert(!t1.before(t2));
-    assert(strcmp(t1.name(), t2.name()) == 0);
-    assert(strcmp(t1.name(), t3.name()) != 0);
+    assert(std::strcmp(t1.name(), t2.name()) == 0);
+    assert(std::strcmp(t1.name(), t3.name()) != 0);
   }
   {
     // type_info has a protected constructor taking a string literal. This
@@ -37,4 +36,6 @@ int main()
     // See: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216201
     assert(test_constructor_explicit("abc"));
   }
+
+  return 0;
 }
diff --git a/test/std/language.support/support.rtti/type.info/type_info_hash.pass.cpp b/test/std/language.support/support.rtti/type.info/type_info_hash.pass.cpp
index c91a21ff2..c65f3bbf7 100644
--- a/test/std/language.support/support.rtti/type.info/type_info_hash.pass.cpp
+++ b/test/std/language.support/support.rtti/type.info/type_info_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,11 +12,13 @@
 #include <cstring>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::type_info& t1 = typeid(int);
     const std::type_info& t2 = typeid(int);
     const std::type_info& t3 = typeid(short);
     assert(t1.hash_code() == t2.hash_code());
     assert(t1.hash_code() != t3.hash_code());
+
+  return 0;
 }
diff --git a/test/std/language.support/support.runtime/csetjmp.pass.cpp b/test/std/language.support/support.runtime/csetjmp.pass.cpp
index f50603056..c1fa71b0e 100644
--- a/test/std/language.support/support.runtime/csetjmp.pass.cpp
+++ b/test/std/language.support/support.runtime/csetjmp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #error setjmp not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::jmp_buf jb;
     ((void)jb); // Prevent unused warning
     static_assert((std::is_same<decltype(std::longjmp(jb, 0)), void>::value),
                   "std::is_same<decltype(std::longjmp(jb, 0)), void>::value");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.runtime/csignal.pass.cpp b/test/std/language.support/support.runtime/csignal.pass.cpp
index a42363f8b..dcfb4f99f 100644
--- a/test/std/language.support/support.runtime/csignal.pass.cpp
+++ b/test/std/language.support/support.runtime/csignal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,11 +47,13 @@
 #error SIGTERM not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::sig_atomic_t sig = 0;
     ((void)sig);
     typedef void (*func)(int);
     static_assert((std::is_same<decltype(std::signal(0, (func)0)), func>::value), "");
     static_assert((std::is_same<decltype(std::raise(0)), int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.runtime/cstdarg.pass.cpp b/test/std/language.support/support.runtime/cstdarg.pass.cpp
index e7282b1c5..8d7fd70b7 100644
--- a/test/std/language.support/support.runtime/cstdarg.pass.cpp
+++ b/test/std/language.support/support.runtime/cstdarg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,8 +30,10 @@
 #error va_start not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::va_list va;
     ((void)va);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.runtime/cstdbool.pass.cpp b/test/std/language.support/support.runtime/cstdbool.pass.cpp
index f52c1556f..461e77c99 100644
--- a/test/std/language.support/support.runtime/cstdbool.pass.cpp
+++ b/test/std/language.support/support.runtime/cstdbool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,6 +26,8 @@
 #error false should not be defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.runtime/cstdlib.pass.cpp b/test/std/language.support/support.runtime/cstdlib.pass.cpp
index 02c8c9fd8..d8b663679 100644
--- a/test/std/language.support/support.runtime/cstdlib.pass.cpp
+++ b/test/std/language.support/support.runtime/cstdlib.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ void test_div_struct() {
     ((void) obj);
 };
 
-int main()
+int main(int, char**)
 {
     std::size_t s = 0;
     ((void)s);
@@ -109,4 +108,6 @@ int main()
     static_assert((std::is_same<decltype(std::wctomb(pc,L' ')), int>::value), "");
     static_assert((std::is_same<decltype(std::mbstowcs(pw,"",0)), std::size_t>::value), "");
     static_assert((std::is_same<decltype(std::wcstombs(pc,pwc,0)), std::size_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.runtime/ctime.pass.cpp b/test/std/language.support/support.runtime/ctime.pass.cpp
index d80bc1982..a8c2dc7ff 100644
--- a/test/std/language.support/support.runtime/ctime.pass.cpp
+++ b/test/std/language.support/support.runtime/ctime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #endif
 #endif
 
-int main()
+int main(int, char**)
 {
     std::clock_t c = 0;
     std::size_t s = 0;
@@ -59,4 +58,6 @@ int main()
     ((void)c1); // Prevent unused warning
     ((void)c2); // Prevent unused warning
     static_assert((std::is_same<decltype(std::strftime(c1,s,c2,&tm)), std::size_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.start.term/quick_exit.pass.cpp b/test/std/language.support/support.start.term/quick_exit.pass.cpp
index 2bf2ea790..50d408aa0 100644
--- a/test/std/language.support/support.start.term/quick_exit.pass.cpp
+++ b/test/std/language.support/support.start.term/quick_exit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03
@@ -14,10 +13,12 @@
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_QUICK_EXIT
     std::at_quick_exit(f);
     std::quick_exit(0);
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.start.term/quick_exit_check1.fail.cpp b/test/std/language.support/support.start.term/quick_exit_check1.fail.cpp
index f42498e3d..63c97f210 100644
--- a/test/std/language.support/support.start.term/quick_exit_check1.fail.cpp
+++ b/test/std/language.support/support.start.term/quick_exit_check1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,11 +15,13 @@
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_QUICK_EXIT
     std::at_quick_exit(f);
 #else
 #error
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.start.term/quick_exit_check2.fail.cpp b/test/std/language.support/support.start.term/quick_exit_check2.fail.cpp
index c49704f99..28929b1ae 100644
--- a/test/std/language.support/support.start.term/quick_exit_check2.fail.cpp
+++ b/test/std/language.support/support.start.term/quick_exit_check2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03
@@ -15,11 +14,13 @@
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_QUICK_EXIT
     std::quick_exit(0);
 #else
 #error
 #endif
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byte.pass.cpp b/test/std/language.support/support.types/byte.pass.cpp
index a1abefa84..842dc38d3 100644
--- a/test/std/language.support/support.types/byte.pass.cpp
+++ b/test/std/language.support/support.types/byte.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,4 +30,6 @@ static_assert(!std::is_same<std::byte, unsigned char>::value, "" );
 // The standard doesn't outright say this, but it's pretty clear that it has to be true.
 static_assert(sizeof(std::byte) == 1, "" );
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/language.support/support.types/byteops/and.assign.pass.cpp b/test/std/language.support/support.types/byteops/and.assign.pass.cpp
index 4aea7909d..9ecdb5f6c 100644
--- a/test/std/language.support/support.types/byteops/and.assign.pass.cpp
+++ b/test/std/language.support/support.types/byteops/and.assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ constexpr std::byte test(std::byte b1, std::byte b2) {
     }
 
 
-int main () {
+int main(int, char**) {
     std::byte b;  // not constexpr, just used in noexcept check
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b8{static_cast<std::byte>(8)};
@@ -36,4 +35,6 @@ int main () {
     static_assert(std::to_integer<int>(test(b8, b1)) == 0, "");
     static_assert(std::to_integer<int>(test(b9, b1)) == 1, "");
     static_assert(std::to_integer<int>(test(b9, b8)) == 8, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/and.pass.cpp b/test/std/language.support/support.types/byteops/and.pass.cpp
index 32c0bdaee..d1dbc75f7 100644
--- a/test/std/language.support/support.types/byteops/and.pass.cpp
+++ b/test/std/language.support/support.types/byteops/and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 
 // constexpr byte operator&(byte l, byte r) noexcept;
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b8{static_cast<std::byte>(8)};
     constexpr std::byte b9{static_cast<std::byte>(9)};
@@ -28,4 +27,6 @@ int main () {
     static_assert(std::to_integer<int>(b8 & b1) ==  0, "");
     static_assert(std::to_integer<int>(b9 & b1) ==  1, "");
     static_assert(std::to_integer<int>(b9 & b8) ==  8, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/enum_direct_init.pass.cpp b/test/std/language.support/support.types/byteops/enum_direct_init.pass.cpp
index 157626137..5111667ce 100644
--- a/test/std/language.support/support.types/byteops/enum_direct_init.pass.cpp
+++ b/test/std/language.support/support.types/byteops/enum_direct_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 // XFAIL: clang-3.5, clang-3.6, clang-3.7, clang-3.8
 // XFAIL: apple-clang-6, apple-clang-7, apple-clang-8.0
 
-int main () {
+int main(int, char**) {
   constexpr std::byte b{42};
   static_assert(std::to_integer<int>(b) == 42, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/lshift.assign.fail.cpp b/test/std/language.support/support.types/byteops/lshift.assign.fail.cpp
index 66946b464..8f2134b20 100644
--- a/test/std/language.support/support.types/byteops/lshift.assign.fail.cpp
+++ b/test/std/language.support/support.types/byteops/lshift.assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,6 +25,8 @@ constexpr std::byte test(std::byte b) {
     }
 
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1 = test(std::byte{1});
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/lshift.assign.pass.cpp b/test/std/language.support/support.types/byteops/lshift.assign.pass.cpp
index 6883dccfb..3647f5c64 100644
--- a/test/std/language.support/support.types/byteops/lshift.assign.pass.cpp
+++ b/test/std/language.support/support.types/byteops/lshift.assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ constexpr std::byte test(std::byte b) {
     }
 
 
-int main () {
+int main(int, char**) {
     std::byte b;  // not constexpr, just used in noexcept check
     constexpr std::byte b2{static_cast<std::byte>(2)};
     constexpr std::byte b3{static_cast<std::byte>(3)};
@@ -33,4 +32,6 @@ int main () {
     static_assert(std::to_integer<int>(test(b2)) ==  8, "" );
     static_assert(std::to_integer<int>(test(b3)) == 12, "" );
 
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/lshift.fail.cpp b/test/std/language.support/support.types/byteops/lshift.fail.cpp
index c21393591..83ce5b81e 100644
--- a/test/std/language.support/support.types/byteops/lshift.fail.cpp
+++ b/test/std/language.support/support.types/byteops/lshift.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 // These functions shall not participate in overload resolution unless
 //   is_integral_v<IntegerType> is true.
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b2 = b1 << 2.0f;
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/lshift.pass.cpp b/test/std/language.support/support.types/byteops/lshift.pass.cpp
index a1731b990..855eebdf4 100644
--- a/test/std/language.support/support.types/byteops/lshift.pass.cpp
+++ b/test/std/language.support/support.types/byteops/lshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 // These functions shall not participate in overload resolution unless
 //   is_integral_v<IntegerType> is true.
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b3{static_cast<std::byte>(3)};
 
@@ -27,4 +26,6 @@ int main () {
     static_assert(std::to_integer<int>(b1 << 2) ==   4, "");
     static_assert(std::to_integer<int>(b3 << 4) ==  48, "");
     static_assert(std::to_integer<int>(b3 << 6) == 192, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/not.pass.cpp b/test/std/language.support/support.types/byteops/not.pass.cpp
index 2629001e9..d6252aa35 100644
--- a/test/std/language.support/support.types/byteops/not.pass.cpp
+++ b/test/std/language.support/support.types/byteops/not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 
 // constexpr byte operator~(byte b) noexcept;
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b2{static_cast<std::byte>(2)};
     constexpr std::byte b8{static_cast<std::byte>(8)};
@@ -24,4 +23,6 @@ int main () {
     static_assert(std::to_integer<int>(~b1) == 254, "");
     static_assert(std::to_integer<int>(~b2) == 253, "");
     static_assert(std::to_integer<int>(~b8) == 247, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/or.assign.pass.cpp b/test/std/language.support/support.types/byteops/or.assign.pass.cpp
index 0cceeaaec..1216b852b 100644
--- a/test/std/language.support/support.types/byteops/or.assign.pass.cpp
+++ b/test/std/language.support/support.types/byteops/or.assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ constexpr std::byte test(std::byte b1, std::byte b2) {
     }
 
 
-int main () {
+int main(int, char**) {
     std::byte b;  // not constexpr, just used in noexcept check
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b2{static_cast<std::byte>(2)};
@@ -37,4 +36,6 @@ int main () {
     static_assert(std::to_integer<int>(test(b8, b1)) ==  9, "");
     static_assert(std::to_integer<int>(test(b8, b2)) == 10, "");
 
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/or.pass.cpp b/test/std/language.support/support.types/byteops/or.pass.cpp
index 62260f27b..69b5bfaac 100644
--- a/test/std/language.support/support.types/byteops/or.pass.cpp
+++ b/test/std/language.support/support.types/byteops/or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 
 // constexpr byte operator|(byte l, byte r) noexcept;
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b2{static_cast<std::byte>(2)};
     constexpr std::byte b8{static_cast<std::byte>(8)};
@@ -28,4 +27,6 @@ int main () {
     static_assert(std::to_integer<int>(b2 | b1) ==  3, "");
     static_assert(std::to_integer<int>(b8 | b1) ==  9, "");
     static_assert(std::to_integer<int>(b8 | b2) == 10, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/rshift.assign.fail.cpp b/test/std/language.support/support.types/byteops/rshift.assign.fail.cpp
index 80f0bd7bc..714f5cd8b 100644
--- a/test/std/language.support/support.types/byteops/rshift.assign.fail.cpp
+++ b/test/std/language.support/support.types/byteops/rshift.assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,6 +25,8 @@ constexpr std::byte test(std::byte b) {
     }
 
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1 = test(std::byte{1});
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/rshift.assign.pass.cpp b/test/std/language.support/support.types/byteops/rshift.assign.pass.cpp
index 6763995f6..b1ca9d851 100644
--- a/test/std/language.support/support.types/byteops/rshift.assign.pass.cpp
+++ b/test/std/language.support/support.types/byteops/rshift.assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ constexpr std::byte test(std::byte b) {
     }
 
 
-int main () {
+int main(int, char**) {
     std::byte b;  // not constexpr, just used in noexcept check
     constexpr std::byte b16{static_cast<std::byte>(16)};
     constexpr std::byte b192{static_cast<std::byte>(192)};
@@ -32,4 +31,6 @@ int main () {
 
     static_assert(std::to_integer<int>(test(b16))  ==  4, "" );
     static_assert(std::to_integer<int>(test(b192)) == 48, "" );
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/rshift.fail.cpp b/test/std/language.support/support.types/byteops/rshift.fail.cpp
index b78af2eb2..6af06f4fc 100644
--- a/test/std/language.support/support.types/byteops/rshift.fail.cpp
+++ b/test/std/language.support/support.types/byteops/rshift.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 // These functions shall not participate in overload resolution unless
 //   is_integral_v<IntegerType> is true.
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b2 = b1 >> 2.0f;
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/rshift.pass.cpp b/test/std/language.support/support.types/byteops/rshift.pass.cpp
index eec3ad683..64db7556c 100644
--- a/test/std/language.support/support.types/byteops/rshift.pass.cpp
+++ b/test/std/language.support/support.types/byteops/rshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ constexpr std::byte test(std::byte b) {
     }
 
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b100{static_cast<std::byte>(100)};
     constexpr std::byte b115{static_cast<std::byte>(115)};
 
@@ -34,4 +33,6 @@ int main () {
     static_assert(std::to_integer<int>(b115 >> 3) ==  14, "");
     static_assert(std::to_integer<int>(b115 >> 6) ==   1, "");
 
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/to_integer.fail.cpp b/test/std/language.support/support.types/byteops/to_integer.fail.cpp
index 86f2ad95b..64996358c 100644
--- a/test/std/language.support/support.types/byteops/to_integer.fail.cpp
+++ b/test/std/language.support/support.types/byteops/to_integer.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 // This function shall not participate in overload resolution unless
 //   is_integral_v<IntegerType> is true.
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     auto f = std::to_integer<float>(b1);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/to_integer.pass.cpp b/test/std/language.support/support.types/byteops/to_integer.pass.cpp
index 065e6d127..657d17d9c 100644
--- a/test/std/language.support/support.types/byteops/to_integer.pass.cpp
+++ b/test/std/language.support/support.types/byteops/to_integer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 // This function shall not participate in overload resolution unless
 //   is_integral_v<IntegerType> is true.
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b3{static_cast<std::byte>(3)};
 
@@ -28,4 +27,6 @@ int main () {
 
     static_assert(std::to_integer<int>(b1) == 1, "");
     static_assert(std::to_integer<int>(b3) == 3, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/xor.assign.pass.cpp b/test/std/language.support/support.types/byteops/xor.assign.pass.cpp
index 07727ec9e..c82a6fd19 100644
--- a/test/std/language.support/support.types/byteops/xor.assign.pass.cpp
+++ b/test/std/language.support/support.types/byteops/xor.assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ constexpr std::byte test(std::byte b1, std::byte b2) {
     }
 
 
-int main () {
+int main(int, char**) {
     std::byte b;  // not constexpr, just used in noexcept check
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b8{static_cast<std::byte>(8)};
@@ -36,4 +35,6 @@ int main () {
     static_assert(std::to_integer<int>(test(b8, b1)) == 9, "");
     static_assert(std::to_integer<int>(test(b9, b1)) == 8, "");
     static_assert(std::to_integer<int>(test(b9, b8)) == 1, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/byteops/xor.pass.cpp b/test/std/language.support/support.types/byteops/xor.pass.cpp
index d7e18c91b..150f455b1 100644
--- a/test/std/language.support/support.types/byteops/xor.pass.cpp
+++ b/test/std/language.support/support.types/byteops/xor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 
 // constexpr byte operator^(byte l, byte r) noexcept;
 
-int main () {
+int main(int, char**) {
     constexpr std::byte b1{static_cast<std::byte>(1)};
     constexpr std::byte b8{static_cast<std::byte>(8)};
     constexpr std::byte b9{static_cast<std::byte>(9)};
@@ -28,4 +27,6 @@ int main () {
     static_assert(std::to_integer<int>(b8 ^ b1) == 9, "");
     static_assert(std::to_integer<int>(b9 ^ b1) == 8, "");
     static_assert(std::to_integer<int>(b9 ^ b8) == 1, "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/max_align_t.pass.cpp b/test/std/language.support/support.types/max_align_t.pass.cpp
index b7fe0ac64..a49f598df 100644
--- a/test/std/language.support/support.types/max_align_t.pass.cpp
+++ b/test/std/language.support/support.types/max_align_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <stdio.h>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 
 #if TEST_STD_VER > 17
@@ -41,4 +40,6 @@ int main()
                   std::alignment_of<void*>::value,
                   "std::alignment_of<std::max_align_t>::value >= "
                   "std::alignment_of<void*>::value");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/null.pass.cpp b/test/std/language.support/support.types/null.pass.cpp
index 7e31a8525..66ecdbc14 100644
--- a/test/std/language.support/support.types/null.pass.cpp
+++ b/test/std/language.support/support.types/null.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,6 +12,8 @@
 #error NULL not defined
 #endif
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/nullptr_t.pass.cpp b/test/std/language.support/support.types/nullptr_t.pass.cpp
index ffa0c90d4..14ab3c65d 100644
--- a/test/std/language.support/support.types/nullptr_t.pass.cpp
+++ b/test/std/language.support/support.types/nullptr_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ void test_nullptr_conversions() {
 #endif
 
 
-int main()
+int main(int, char**)
 {
     static_assert(sizeof(std::nullptr_t) == sizeof(void*),
                   "sizeof(std::nullptr_t) == sizeof(void*)");
@@ -104,4 +103,6 @@ int main()
         test_comparisons<void(*)()>();
     }
     test_nullptr_conversions();
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/nullptr_t_integral_cast.fail.cpp b/test/std/language.support/support.types/nullptr_t_integral_cast.fail.cpp
index 92bd87943..5802e46f1 100644
--- a/test/std/language.support/support.types/nullptr_t_integral_cast.fail.cpp
+++ b/test/std/language.support/support.types/nullptr_t_integral_cast.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     std::ptrdiff_t i = static_cast<std::ptrdiff_t>(nullptr);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/nullptr_t_integral_cast.pass.cpp b/test/std/language.support/support.types/nullptr_t_integral_cast.pass.cpp
index 34c7a93e4..b7696df97 100644
--- a/test/std/language.support/support.types/nullptr_t_integral_cast.pass.cpp
+++ b/test/std/language.support/support.types/nullptr_t_integral_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,8 +16,10 @@
 #include <cstddef>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ptrdiff_t i = reinterpret_cast<std::ptrdiff_t>(nullptr);
     assert(i == 0);
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/offsetof.pass.cpp b/test/std/language.support/support.types/offsetof.pass.cpp
index d479f9ca4..756f55352 100644
--- a/test/std/language.support/support.types/offsetof.pass.cpp
+++ b/test/std/language.support/support.types/offsetof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,9 @@ struct A
     int x;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert(noexcept(offsetof(A, x)), "");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/ptrdiff_t.pass.cpp b/test/std/language.support/support.types/ptrdiff_t.pass.cpp
index 702ec720a..de6f7726f 100644
--- a/test/std/language.support/support.types/ptrdiff_t.pass.cpp
+++ b/test/std/language.support/support.types/ptrdiff_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 //  2. be the same sizeof as void*.
 //  3. be a signed integral.
 
-int main()
+int main(int, char**)
 {
     static_assert(sizeof(std::ptrdiff_t) == sizeof(void*),
                   "sizeof(std::ptrdiff_t) == sizeof(void*)");
@@ -24,4 +23,6 @@ int main()
                   "std::is_signed<std::ptrdiff_t>::value");
     static_assert(std::is_integral<std::ptrdiff_t>::value,
                   "std::is_integral<std::ptrdiff_t>::value");
+
+  return 0;
 }
diff --git a/test/std/language.support/support.types/size_t.pass.cpp b/test/std/language.support/support.types/size_t.pass.cpp
index bb3b0805b..5c840457b 100644
--- a/test/std/language.support/support.types/size_t.pass.cpp
+++ b/test/std/language.support/support.types/size_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 //  2. be the same sizeof as void*.
 //  3. be an unsigned integral.
 
-int main()
+int main(int, char**)
 {
     static_assert(sizeof(std::size_t) == sizeof(void*),
                   "sizeof(std::size_t) == sizeof(void*)");
@@ -24,4 +23,6 @@ int main()
                   "std::is_unsigned<std::size_t>::value");
     static_assert(std::is_integral<std::size_t>::value,
                   "std::is_integral<std::size_t>::value");
+
+  return 0;
 }
diff --git a/test/std/localization/c.locales/clocale.pass.cpp b/test/std/localization/c.locales/clocale.pass.cpp
index 534213495..d8bd81b2b 100644
--- a/test/std/localization/c.locales/clocale.pass.cpp
+++ b/test/std/localization/c.locales/clocale.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@
 #error NULL not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::lconv lc;
     ((void)lc); // Prevent unused warning
@@ -52,4 +51,6 @@ int main()
     static_assert((std::is_same<decltype(std::setlocale(0, "")), char*>::value), "");
 #endif
     static_assert((std::is_same<decltype(std::localeconv()), std::lconv*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate.byname/compare.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate.byname/compare.pass.cpp
index dfbdeaea9..1d76fa609 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate.byname/compare.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate.byname/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -69,4 +68,6 @@ int main()
                              s3.data(), s3.data() + s3.size()) == 1);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp
index df67f432e..40c15d6e9 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     std::locale l(LOCALE_en_US_UTF_8);
     {
@@ -40,4 +39,6 @@ int main()
         assert(f.hash(x1.data(), x1.data() + x1.size())
             != f.hash(x2.data(), x2.data() + x2.size()));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp
index 4f738076e..0b86979f5 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -54,4 +53,6 @@ int main()
             assert(f.transform(x.data(), x.data() + x.size()) == x);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp
index 7c07c71d1..f4dfd6522 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     std::locale l(LOCALE_en_US_UTF_8);
     {
@@ -44,4 +43,6 @@ int main()
         assert(&std::use_facet<std::collate<wchar_t> >(l)
             == &std::use_facet<std::collate_byname<wchar_t> >(l));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate/ctor.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate/ctor.pass.cpp
index 8f7e2b5f8..856074d39 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 template <class C> int my_facet<C>::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet<char>);
@@ -64,4 +63,6 @@ int main()
         assert(my_facet<wchar_t>::count == 1);
     }
     assert(my_facet<wchar_t>::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/compare.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/compare.pass.cpp
index d2cf3a921..bfbbebe39 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/compare.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -46,4 +45,6 @@ int main()
         assert(f.compare(ib+1, ib+3, ia, ia+sa) == 1);
         assert(f.compare(ia, ia+3, ib, ib+3) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/hash.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/hash.pass.cpp
index d8a9650e3..07e29b17f 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/hash.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -36,4 +35,6 @@ int main()
         assert(f.hash(x1.data(), x1.data() + x1.size())
             != f.hash(x2.data(), x2.data() + x2.size()));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/transform.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/transform.pass.cpp
index e78a3c74c..7588a82be 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/transform.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.members/transform.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         const std::collate<wchar_t>& f = std::use_facet<std::collate<wchar_t> >(l);
         assert(f.transform(x.data(), x.data() + x.size()) == x);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate/locale.collate.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate/types.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate/types.pass.cpp
index fd0b177c8..63e2739f4 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -48,4 +47,6 @@ int main()
         static_assert((std::is_same<std::collate<wchar_t>::string_type, std::wstring>::value), "");
         static_assert((std::is_base_of<std::locale::facet, std::collate<wchar_t> >::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.collate/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/category.collate/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.collate/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/ctype_base.pass.cpp b/test/std/localization/locale.categories/category.ctype/ctype_base.pass.cpp
index c260e34e3..b7da91b46 100644
--- a/test/std/localization/locale.categories/category.ctype/ctype_base.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/ctype_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,7 @@
 template <class T>
 void test(const T &) {}
 
-int main()
+int main(int, char**)
 {
     assert(std::ctype_base::space);
     assert(std::ctype_base::print);
@@ -75,4 +74,6 @@ int main()
     test(std::ctype_base::blank);
     test(std::ctype_base::alnum);
     test(std::ctype_base::graph);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.dtor/dtor.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.dtor/dtor.pass.cpp
index 9fcedddbd..e38af450f 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.dtor/dtor.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.dtor/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "count_new.hpp"
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new std::ctype<char>);
@@ -37,4 +36,6 @@ int main()
         assert(globalMemCounter.checkDeleteArrayCalledEq(0));
     }
     assert(globalMemCounter.checkDeleteArrayCalledEq(1));
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/ctor.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/ctor.pass.cpp
index a1e15ba45..4ec37db02 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -47,4 +46,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_1.pass.cpp
index 945de76a7..562f6c25e 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -56,4 +55,6 @@ int main()
         assert(f.is(F::graph, '.'));
         assert(!f.is(F::graph,  '\x07'));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_many.pass.cpp
index 74a4906fd..c073a955e 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/is_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -115,4 +114,6 @@ int main()
         assert( (m[5] & F::alnum));
         assert( (m[5] & F::graph));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_1.pass.cpp
index dedf6a7d3..d2fa02201 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.narrow('a', '*') == 'a');
         assert(f.narrow('1', '*') == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_many.pass.cpp
index 4c5478afd..481469540 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/narrow_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -35,4 +34,6 @@ int main()
         assert(v[4] == 'a');
         assert(v[5] == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_is.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_is.pass.cpp
index 9777c9892..043ca6796 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_is.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_is.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -41,4 +40,6 @@ int main()
         assert(f.scan_is(F::alnum, in.data(), in.data() + in.size()) - in.data() == 1);
         assert(f.scan_is(F::graph, in.data(), in.data() + in.size()) - in.data() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_not.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_not.pass.cpp
index b17662d03..066a06a7f 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_not.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/scan_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -41,4 +40,6 @@ int main()
         assert(f.scan_not(F::alnum, in.data(), in.data() + in.size()) - in.data() == 0);
         assert(f.scan_not(F::graph, in.data(), in.data() + in.size()) - in.data() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/table.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/table.pass.cpp
index f28f4f99b..6a0fea0b1 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/table.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/table.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::ctype<char> F;
     {
@@ -30,4 +29,6 @@ int main()
         const F& f = std::use_facet<F>(l);
         assert(f.table() == table);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_1.pass.cpp
index 1dfc95fe6..ddf4fbdb0 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.tolower('a') == 'a');
         assert(f.tolower('1') == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_many.pass.cpp
index 22b27370e..b307d4627 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/tolower_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -33,4 +32,6 @@ int main()
         assert(in[4] == 'a');
         assert(in[5] == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_1.pass.cpp
index 2a714b1d5..8b5505910 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.toupper('a') == 'A');
         assert(f.toupper('1') == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_many.pass.cpp
index 8a842c8df..3d1c453cf 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/toupper_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -33,4 +32,6 @@ int main()
         assert(in[4] == 'A');
         assert(in[5] == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_1.pass.cpp
index 5a65a561a..81c3ab6b3 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.widen('a') == 'a');
         assert(f.widen('1') == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_many.pass.cpp
index c86cc55ce..35d9335c2 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.members/widen_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -35,4 +34,6 @@ int main()
         assert(v[4] == 'a');
         assert(v[5] == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
index f7b0e5b71..7f46238d6 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::ctype<char> F;
     assert(F::classic_table() != 0);
@@ -56,4 +55,6 @@ int main()
         assert(((p[i] & ~set) & defined) == 0);   // no extra ones
     }
 
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/types.pass.cpp b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/types.pass.cpp
index be223ce79..c46dbb3e6 100644
--- a/test/std/localization/locale.categories/category.ctype/facet.ctype.special/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/facet.ctype.special/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -36,4 +35,6 @@ int main()
         static_assert((std::is_base_of<std::ctype_base, std::ctype<char> >::value), "");
         static_assert((std::is_base_of<std::locale::facet, std::ctype<char> >::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char.pass.cpp
index 24c2f23f0..03d17375e 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet(LOCALE_en_US));
@@ -69,4 +68,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t.pass.cpp
index 0559896ba..eedf192db 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char16_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet("en_US"));
@@ -67,4 +66,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t.pass.cpp
index 8eda52def..8e5d70356 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_char32_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet("en_US"));
@@ -67,4 +66,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp
index adaf4e8fb..5503192ca 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet(LOCALE_en_US_UTF_8));
@@ -71,4 +70,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_base.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_base.pass.cpp
index a2973b7f3..c2e40542e 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_base.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/codecvt_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::codecvt_base::ok == 0);
     assert(std::codecvt_base::partial == 1);
     assert(std::codecvt_base::error == 2);
     assert(std::codecvt_base::noconv == 3);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char.pass.cpp
index 121a815bf..3f0dc9e7c 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t.pass.cpp
index 5a6cdee9f..e2df342d4 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char16_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ int my_facet::count = 0;
 
 //#endif
 
-int main()
+int main(int, char**)
 {
 //#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     {
@@ -55,4 +54,6 @@ int main()
     }
     assert(my_facet::count == 0);
 //#endif
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t.pass.cpp
index fae0d7bb2..0df7f3515 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_char32_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ int my_facet::count = 0;
 
 //#endif
 
-int main()
+int main(int, char**)
 {
 //#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     {
@@ -55,4 +54,6 @@ int main()
     }
     assert(my_facet::count == 0);
 //#endif
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_wchar_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_wchar_t.pass.cpp
index 4cd84f243..6917e1b72 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_wchar_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/ctor_wchar_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_always_noconv.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_always_noconv.pass.cpp
index 4a0f94f98..e1741aec0 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_always_noconv.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_always_noconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char16_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(!f.always_noconv());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_encoding.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_encoding.pass.cpp
index d2a6ae395..f4614984a 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_encoding.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_encoding.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char16_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.encoding() == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_in.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_in.pass.cpp
index 41c26508e..2a6a07ef9 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_in.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 typedef std::codecvt<char16_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const char from[] = "some text";
@@ -37,4 +36,6 @@ int main()
     assert(to_next - to == 9);
     for (unsigned i = 0; i < 9; ++i)
         assert(to[i] == from[i]);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_length.pass.cpp
index bd3482974..038ae9711 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 typedef std::codecvt<char16_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
@@ -29,4 +28,6 @@ int main()
     assert(f.length(mbs, from, from+10, 9) == 9);
     assert(f.length(mbs, from, from+10, 10) == 10);
     assert(f.length(mbs, from, from+10, 100) == 10);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_max_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_max_length.pass.cpp
index 8abe10b82..bcaa70528 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_max_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_max_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char16_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.max_length() == 4);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_out.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_out.pass.cpp
index 18997714f..cff42b0c0 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_out.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 typedef std::codecvt<char16_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
@@ -42,4 +41,6 @@ int main()
         for (unsigned i = 0; i < 9; ++i)
             assert(to[i] == from[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_unshift.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_unshift.pass.cpp
index 9b91a03d4..5b027bae7 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_unshift.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char16_t_unshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 typedef std::codecvt<char16_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     std::vector<char> to(3);
@@ -30,4 +29,6 @@ int main()
     char* to_next = 0;
     assert(f.unshift(mbs, to.data(), to.data() + to.size(), to_next) == F::noconv);
     assert(to_next == to.data());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_always_noconv.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_always_noconv.pass.cpp
index 2270a308f..2b2f136e3 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_always_noconv.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_always_noconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char32_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(!f.always_noconv());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_encoding.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_encoding.pass.cpp
index 175470a67..0d2f35fc2 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_encoding.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_encoding.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char32_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.encoding() == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_in.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_in.pass.cpp
index f645b32f2..eb7c53fce 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_in.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 typedef std::codecvt<char32_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const char from[] = "some text";
@@ -37,4 +36,6 @@ int main()
     assert(to_next - to == 9);
     for (unsigned i = 0; i < 9; ++i)
         assert(to[i] == static_cast<char32_t>(from[i]));
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_length.pass.cpp
index 4455b9f55..da8530688 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 typedef std::codecvt<char32_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
@@ -29,4 +28,6 @@ int main()
     assert(f.length(mbs, from, from+10, 9) == 9);
     assert(f.length(mbs, from, from+10, 10) == 10);
     assert(f.length(mbs, from, from+10, 100) == 10);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_max_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_max_length.pass.cpp
index 62b4919c5..f31dba747 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_max_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_max_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char32_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.max_length() == 4);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_out.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_out.pass.cpp
index 05a90d33d..7ed560943 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_out.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 typedef std::codecvt<char32_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
@@ -42,4 +41,6 @@ int main()
         for (unsigned i = 0; i < 9; ++i)
             assert(static_cast<char32_t>(to[i]) == from[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_unshift.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_unshift.pass.cpp
index 0a4aa2003..aaf9a6a20 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_unshift.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char32_t_unshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 typedef std::codecvt<char32_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     std::vector<char> to(3);
@@ -30,4 +29,6 @@ int main()
     char* to_next = 0;
     assert(f.unshift(mbs, to.data(), to.data() + to.size(), to_next) == F::noconv);
     assert(to_next == to.data());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_always_noconv.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_always_noconv.pass.cpp
index 71640490e..c253bbed7 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_always_noconv.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_always_noconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.always_noconv());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_encoding.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_encoding.pass.cpp
index 79bc2bfa5..79c26add6 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_encoding.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_encoding.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.encoding() == 1);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_in.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_in.pass.cpp
index 10c9fcdc0..1f2cdb6be 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_in.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 typedef std::codecvt<char, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const std::basic_string<F::intern_type> from("some text");
@@ -35,4 +34,6 @@ int main()
                      to.data(), to.data() + to.size(), to_next) == F::noconv);
     assert(from_next == from.data());
     assert(to_next == to.data());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_length.pass.cpp
index c5897c86b..ad45cba5f 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 typedef std::codecvt<char, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
@@ -29,4 +28,6 @@ int main()
     assert(f.length(mbs, from, from+10, 10) == 10);
     assert(f.length(mbs, from, from+10, 11) == 10);
     assert(f.length(mbs, from, from+10, 100) == 10);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_max_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_max_length.pass.cpp
index 626c65244..437e72b94 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_max_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_max_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<char, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.max_length() == 1);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_out.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_out.pass.cpp
index 17bde6cec..be266746c 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_out.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 typedef std::codecvt<char, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const std::basic_string<F::intern_type> from("some text");
@@ -35,4 +34,6 @@ int main()
                       to.data(), to.data() + to.size(), to_next) == F::noconv);
     assert(from_next == from.data());
     assert(to_next == to.data());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_unshift.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_unshift.pass.cpp
index 834fa0f27..a3d9e3d14 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_unshift.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/char_unshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 typedef std::codecvt<char, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     std::vector<char> to(3);
@@ -30,4 +29,6 @@ int main()
     char* to_next = 0;
     assert(f.unshift(mbs, to.data(), to.data() + to.size(), to_next) == F::noconv);
     assert(to_next == to.data());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
index c25607878..eaae7b6e9 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt<char32_t, char, std::mbstate_t> F32_8;
     typedef std::codecvt<char16_t, char, std::mbstate_t> F16_8;
@@ -124,4 +123,6 @@ int main()
             assert(c32 == c32x);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_always_noconv.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_always_noconv.pass.cpp
index 258998ff4..484b2213d 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_always_noconv.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_always_noconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(!f.always_noconv());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_encoding.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_encoding.pass.cpp
index b7604f33d..9c075af13 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_encoding.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_encoding.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.encoding() == 1);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_in.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_in.pass.cpp
index 0412f6fa5..bec0e6cb0 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_in.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const std::basic_string<F::extern_type> from("some text");
@@ -40,4 +39,6 @@ int main()
     assert(static_cast<std::size_t>(to_next - to.data()) == expected.size());
     assert(static_cast<std::size_t>(to_next - to.data()) == expected.size());
     assert(to == expected);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_length.pass.cpp
index 69037aad7..4fd5d3293 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
@@ -29,4 +28,6 @@ int main()
     assert(f.length(mbs, from, from+10, 10) == 10);
     assert(f.length(mbs, from, from+10, 11) == 10);
     assert(f.length(mbs, from, from+10, 100) == 10);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_max_length.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_max_length.pass.cpp
index 38ce51455..90d913151 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_max_length.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_max_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
     assert(f.max_length() == 1);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp
index e4cabf6ef..bc12bdbce 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     const F& f = std::use_facet<F>(l);
@@ -68,4 +67,6 @@ int main()
         assert(static_cast<std::size_t>(to_next - to.data()) == to.size()-1);
         assert(to.data() == std::string("some te"));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_unshift.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_unshift.pass.cpp
index 10ab7a2b8..e0f7c3c95 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_unshift.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_unshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     std::vector<F::extern_type> to(3);
@@ -32,4 +31,6 @@ int main()
     F::extern_type* to_next = 0;
     assert(f.unshift(mbs, to.data(), to.data() + to.size(), to_next) == F::ok);
     assert(to_next == to.data());
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char.pass.cpp
index 892e89391..455cf03ee 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt<char, char, std::mbstate_t> F;
     static_assert((std::is_base_of<std::locale::facet, F>::value), "");
@@ -38,4 +37,6 @@ int main()
     const F& f = std::use_facet<F>(l);
     ((void)f); // Prevent unused warning
     (void)F::id;
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t.pass.cpp
index 2b4a686cf..f52c60f1b 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char16_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt<char16_t, char, std::mbstate_t> F;
     static_assert((std::is_base_of<std::locale::facet, F>::value), "");
@@ -38,4 +37,6 @@ int main()
     const F& f = std::use_facet<F>(l);
     (void)F::id;
     ((void)f);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t.pass.cpp
index c76fea9af..c75de419c 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_char32_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt<char32_t, char, std::mbstate_t> F;
     static_assert((std::is_base_of<std::locale::facet, F>::value), "");
@@ -38,4 +37,6 @@ int main()
     const F& f = std::use_facet<F>(l);
     (void)F::id;
     ((void)f);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_wchar_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_wchar_t.pass.cpp
index bfec2339f..07e25be71 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_wchar_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/types_wchar_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt<wchar_t, char, std::mbstate_t> F;
     static_assert((std::is_base_of<std::locale::facet, F>::value), "");
@@ -38,4 +37,6 @@ int main()
     const F& f = std::use_facet<F>(l);
     ((void)f); // Prevent unused warning
     (void)F::id;
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_1.pass.cpp
index 509e52ab0..3331c5a67 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -109,4 +108,6 @@ int main()
             assert(!f.is(F::upper, L'\x00DA'));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_many.pass.cpp
index a993466ab..6751fd60d 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/is_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -244,4 +243,6 @@ int main()
             assert( (m[6] & F::graph));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/mask.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/mask.pass.cpp
index a09072a98..3a6360eb9 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/mask.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/mask.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l("C");
@@ -50,4 +49,6 @@ int main()
             assert( cf.is(CF::alpha,  'a'));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_1.pass.cpp
index 904ced323..6d1937725 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::string(LOCALE_fr_CA_ISO8859_1));
@@ -53,4 +52,6 @@ int main()
             assert(f.narrow(L'\xDA', '*') == '*');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_many.pass.cpp
index 6f25b9cad..7ab4874fb 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/narrow_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_fr_CA_ISO8859_1);
@@ -61,4 +60,6 @@ int main()
             assert(v[6] == '*');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_is.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_is.pass.cpp
index 25b2c3e4e..b736dd786 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_is.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_is.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -68,4 +67,6 @@ int main()
             assert(f.scan_is(F::graph, in.data(), in.data() + in.size()) - in.data() == 2);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_not.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_not.pass.cpp
index 270ae1f15..fa7674a8c 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_not.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/scan_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -68,4 +67,6 @@ int main()
             assert(f.scan_not(F::graph, in.data(), in.data() + in.size()) - in.data() == 0);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp
index a9a872014..ab5daa7aa 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l;
@@ -89,4 +88,6 @@ int main()
             assert(f.tolower(L'\xFA') == L'\xFA');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp
index 67fe44931..29403cb10 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l;
@@ -95,4 +94,6 @@ int main()
             assert(in[6] == L'1');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp
index 271ae2c03..56304a755 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l;
@@ -91,4 +90,6 @@ int main()
             assert(f.toupper(L'\xFA') == L'\xFA');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp
index 650713570..bfc3bf848 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l;
@@ -95,4 +94,6 @@ int main()
             assert(in[6] == L'1');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp
index 0e9909720..ce0a0e30e 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -57,4 +56,6 @@ int main()
                 == &std::use_facet<std::ctype_byname<wchar_t> >(l));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp
index 1070fa613..1dc9b7de8 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l;
@@ -62,4 +61,6 @@ int main()
 #endif
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp
index 9b841b28b..67a97ba68 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(LOCALE_en_US_UTF_8);
@@ -68,4 +67,6 @@ int main()
 #endif
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/ctor.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/ctor.pass.cpp
index 7eb3cc895..f53d4e964 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
 
 template <class C> int my_facet<C>::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet<wchar_t>);
@@ -48,4 +47,6 @@ int main()
         assert(my_facet<wchar_t>::count == 1);
     }
     assert(my_facet<wchar_t>::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_1.pass.cpp
index fa82da96b..23a1aa9d2 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -56,4 +55,6 @@ int main()
         assert(f.is(F::graph, L'.'));
         assert(!f.is(F::graph,  L'\x07'));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_many.pass.cpp
index 7084245d9..d9dd5b58a 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/is_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -115,4 +114,6 @@ int main()
         assert( (m[5] & F::alnum));
         assert( (m[5] & F::graph));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_1.pass.cpp
index ad8fb2117..55e1f378b 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.narrow(L'a', '*') == 'a');
         assert(f.narrow(L'1', '*') == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_many.pass.cpp
index fcc6cfccd..47c2b5188 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/narrow_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -35,4 +34,6 @@ int main()
         assert(v[4] == 'a');
         assert(v[5] == '1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_is.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_is.pass.cpp
index 535c83078..1891b155b 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_is.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_is.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -41,4 +40,6 @@ int main()
         assert(f.scan_is(F::alnum, in.data(), in.data() + in.size()) - in.data() == 1);
         assert(f.scan_is(F::graph, in.data(), in.data() + in.size()) - in.data() == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_not.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_not.pass.cpp
index da21642b9..40cc8c0fa 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_not.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/scan_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include <stdio.h>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -41,4 +40,6 @@ int main()
         assert(f.scan_not(F::alnum, in.data(), in.data() + in.size()) - in.data() == 0);
         assert(f.scan_not(F::graph, in.data(), in.data() + in.size()) - in.data() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_1.pass.cpp
index 6e75ba483..1ae14410c 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.tolower(L'a') == L'a');
         assert(f.tolower(L'1') == L'1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_many.pass.cpp
index 68daf8d88..711343d3c 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/tolower_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -33,4 +32,6 @@ int main()
         assert(in[4] == L'a');
         assert(in[5] == L'1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_1.pass.cpp
index 2a5acd179..fbc28a1b8 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.toupper(L'a') == L'A');
         assert(f.toupper(L'1') == L'1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_many.pass.cpp
index f0a7ee3d2..963e894a7 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/toupper_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -33,4 +32,6 @@ int main()
         assert(in[4] == L'A');
         assert(in[5] == L'1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_1.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_1.pass.cpp
index 2a8733c20..c2570a311 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_1.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -30,4 +29,6 @@ int main()
         assert(f.widen('a') == L'a');
         assert(f.widen('1') == L'1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_many.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_many.pass.cpp
index 1c656011a..a43817a25 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.members/widen_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -35,4 +34,6 @@ int main()
         assert(v[4] == L'a');
         assert(v[5] == L'1');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/locale.ctype.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype/types.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype/types.pass.cpp
index ae3566060..35b5d3282 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -36,4 +35,6 @@ int main()
         static_assert((std::is_base_of<std::ctype_base, std::ctype<wchar_t> >::value), "");
         static_assert((std::is_base_of<std::locale::facet, std::ctype<wchar_t> >::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.messages/locale.messages.byname/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/category.messages/locale.messages.byname/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.messages/locale.messages.byname/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/category.messages/locale.messages.byname/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.messages/locale.messages/ctor.pass.cpp b/test/std/localization/locale.categories/category.messages/locale.messages/ctor.pass.cpp
index e82878a31..ddbbe6669 100644
--- a/test/std/localization/locale.categories/category.messages/locale.messages/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.messages/locale.messages/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.members/not_testable.pass.cpp b/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.members/not_testable.pass.cpp
index 6bed5383c..c0166f80f 100644
--- a/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.members/not_testable.pass.cpp
+++ b/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.members/not_testable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,6 +28,8 @@ public:
         : std::messages<CharT>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.messages/locale.messages/locale.messages.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.messages/locale.messages/messages_base.pass.cpp b/test/std/localization/locale.categories/category.messages/locale.messages/messages_base.pass.cpp
index cf9b4c899..ce6d70be7 100644
--- a/test/std/localization/locale.categories/category.messages/locale.messages/messages_base.pass.cpp
+++ b/test/std/localization/locale.categories/category.messages/locale.messages/messages_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <locale>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::messages_base mb;
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.messages/locale.messages/types.pass.cpp b/test/std/localization/locale.categories/category.messages/locale.messages/types.pass.cpp
index 60e47b537..436290698 100644
--- a/test/std/localization/locale.categories/category.messages/locale.messages/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.messages/locale.messages/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <locale>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::messages<char> >::value), "");
     static_assert((std::is_base_of<std::messages_base, std::messages<char> >::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::messages<wchar_t>::char_type, wchar_t>::value), "");
     static_assert((std::is_same<std::messages<char>::string_type, std::string>::value), "");
     static_assert((std::is_same<std::messages<wchar_t>::string_type, std::wstring>::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.messages/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/category.messages/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.messages/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/category.messages/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/ctor.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/ctor.pass.cpp
index 9052826a5..360ff3ad6 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_en_US.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_en_US.pass.cpp
index 0f034fa4f..9fec21f51 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_en_US.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_en_US.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_en_US_UTF_8);
@@ -720,4 +719,6 @@ int main()
             assert(err == std::ios_base::failbit);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp
index ce046e61e..292f5eaea 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -77,7 +76,7 @@ static std::wstring convert_thousands_sep(std::wstring const& in) {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_fr_FR_UTF_8);
@@ -754,4 +753,6 @@ int main()
             assert(ex == 123456789);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
index 5b56ab3e7..c13849804 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -56,7 +55,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_ru_RU_UTF_8);
@@ -736,4 +735,6 @@ int main()
             assert(ex == -123456789);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_zh_CN.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_zh_CN.pass.cpp
index 4e62a1bc0..9b006f55b 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_zh_CN.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_zh_CN.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -50,7 +49,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_zh_CN_UTF_8);
@@ -726,4 +725,6 @@ int main()
             assert(err == std::ios_base::failbit);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_string_en_US.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_string_en_US.pass.cpp
index b9099f4f8..1b1a471e1 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_string_en_US.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_string_en_US.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_en_US_UTF_8);
@@ -728,4 +727,6 @@ int main()
             assert(ex == L"");
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.get/types.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.get/types.pass.cpp
index 2e4fb3242..7bc04801e 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.get/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.get/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <locale>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::money_get<char> >::value), "");
     static_assert((std::is_base_of<std::locale::facet, std::money_get<wchar_t> >::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::money_get<wchar_t>::iter_type, std::istreambuf_iterator<wchar_t> >::value), "");
     static_assert((std::is_same<std::money_get<char>::string_type, std::string>::value), "");
     static_assert((std::is_same<std::money_get<wchar_t>::string_type, std::wstring>::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/ctor.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/ctor.pass.cpp
index d0a0007ba..309d26c5d 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_en_US.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_en_US.pass.cpp
index db193eabc..d6e4d6cc1 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_en_US.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_en_US.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_en_US_UTF_8);
@@ -491,4 +490,6 @@ int main()
         assert(ios.width() == 0);
     }
 }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp
index 2ba29dfff..72f3f6570 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -79,7 +78,7 @@ static std::wstring convert_thousands_sep(std::wstring const& in) {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_fr_FR_UTF_8);
@@ -525,4 +524,6 @@ int main()
         assert(ios.width() == 0);
     }
 }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
index 56fb85058..36f97b1d8 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -56,7 +55,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_ru_RU_UTF_8);
@@ -502,4 +501,6 @@ int main()
         assert(ios.width() == 0);
     }
 }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_zh_CN.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_zh_CN.pass.cpp
index 1036969bb..a300ba847 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_zh_CN.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_zh_CN.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -50,7 +49,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_zh_CN_UTF_8);
@@ -496,4 +495,6 @@ int main()
         assert(ios.width() == 0);
     }
 }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_string_en_US.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_string_en_US.pass.cpp
index 659f948d6..cd1ff643f 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_string_en_US.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_string_en_US.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ public:
         : Fw(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::string loc_name(LOCALE_en_US_UTF_8);
@@ -491,4 +490,6 @@ int main()
         assert(ios.width() == 0);
     }
 }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.money.put/types.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.money.put/types.pass.cpp
index 44ff1073d..bd797313c 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.money.put/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.money.put/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <locale>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::money_put<char> >::value), "");
     static_assert((std::is_base_of<std::locale::facet, std::money_put<wchar_t> >::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::money_put<wchar_t>::iter_type, std::ostreambuf_iterator<wchar_t> >::value), "");
     static_assert((std::is_same<std::money_put<char>::string_type, std::string>::value), "");
     static_assert((std::is_same<std::money_put<wchar_t>::string_type, std::wstring>::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp
index c6cab19b2..43a2fbc17 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -62,7 +61,21 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+#if defined(_CS_GNU_LIBC_VERSION)
+static bool glibc_version_less_than(char const* version) {
+    std::string test_version = std::string("glibc ") + version;
+
+    size_t n = confstr(_CS_GNU_LIBC_VERSION, nullptr, (size_t)0);
+    char *current_version = new char[n];
+    confstr(_CS_GNU_LIBC_VERSION, current_version, n);
+
+    bool result = strverscmp(current_version, test_version.c_str()) < 0;
+    delete[] current_version;
+    return result;
+}
+#endif
+
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -117,17 +130,14 @@ int main()
 
     {
         Fnf f(LOCALE_ru_RU_UTF_8, 1);
+#if defined(_CS_GNU_LIBC_VERSION)
         // GLIBC <= 2.23 uses currency_symbol="<U0440><U0443><U0431>"
         // GLIBC >= 2.24 uses currency_symbol="<U20BD>"
         // See also: http://www.fileformat.info/info/unicode/char/20bd/index.htm
-#if defined(TEST_GLIBC_PREREQ)
-    #if TEST_GLIBC_PREREQ(2, 24)
-        #define TEST_GLIBC_2_24_CURRENCY_SYMBOL
-    #endif
-#endif
-
-#if defined(TEST_GLIBC_2_24_CURRENCY_SYMBOL)
-        assert(f.curr_symbol() == " \u20BD");
+        if (!glibc_version_less_than("2.24"))
+          assert(f.curr_symbol() == " \u20BD");
+        else
+          assert(f.curr_symbol() == " \xD1\x80\xD1\x83\xD0\xB1");
 #else
         assert(f.curr_symbol() == " \xD1\x80\xD1\x83\xD0\xB1");
 #endif
@@ -138,8 +148,11 @@ int main()
     }
     {
         Fwf f(LOCALE_ru_RU_UTF_8, 1);
-#if defined(TEST_GLIBC_2_24_CURRENCY_SYMBOL)
-        assert(f.curr_symbol() == L" \u20BD");
+#if defined(_CS_GNU_LIBC_VERSION)
+        if (!glibc_version_less_than("2.24"))
+          assert(f.curr_symbol() == L" \u20BD");
+        else
+          assert(f.curr_symbol() == L" \x440\x443\x431");
 #else
         assert(f.curr_symbol() == L" \x440\x443\x431");
 #endif
@@ -166,4 +179,6 @@ int main()
         Fwt f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.curr_symbol() == L"CNY ");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp
index e1c616c55..bec52e6ab 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -154,4 +153,6 @@ int main()
         Fwt f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.decimal_point() == L'.');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/frac_digits.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/frac_digits.pass.cpp
index 724dc1e5c..07d78229a 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/frac_digits.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/frac_digits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -142,4 +141,6 @@ int main()
         Fwt f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.frac_digits() == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/grouping.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/grouping.pass.cpp
index f050164b6..2c2da4864 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/grouping.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/grouping.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -61,7 +60,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     // Monetary grouping strings may be terminated with 0 or CHAR_MAX, defining
     // how the grouping is repeated.
@@ -150,4 +149,6 @@ int main()
         Fwt f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.grouping() == "\3");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp
index edbaf8600..f3f637b60 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/neg_format.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -61,7 +60,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -227,4 +226,6 @@ int main()
         assert(p.field[2] == std::money_base::none);
         assert(p.field[3] == std::money_base::value);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/negative_sign.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/negative_sign.pass.cpp
index 66c8c6424..5567fc08e 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/negative_sign.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/negative_sign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -142,4 +141,6 @@ int main()
         Fwt f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.negative_sign() == L"-");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/pos_format.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/pos_format.pass.cpp
index f401b72d8..f7d396a66 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/pos_format.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/pos_format.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -61,7 +60,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -227,4 +226,6 @@ int main()
         assert(p.field[2] == std::money_base::none);
         assert(p.field[3] == std::money_base::value);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/positive_sign.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/positive_sign.pass.cpp
index 04cd173dd..43dfa2a2f 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/positive_sign.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/positive_sign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -142,4 +141,6 @@ int main()
         Fwt f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.positive_sign() == L"");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/thousands_sep.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/thousands_sep.pass.cpp
index 90fb7193e..c789c4e5b 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/thousands_sep.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/thousands_sep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -60,7 +59,7 @@ public:
         : std::moneypunct_byname<wchar_t, true>(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f("C", 1);
@@ -171,4 +170,6 @@ int main()
         Fwt f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.thousands_sep() == L',');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/ctor.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/ctor.pass.cpp
index 798dbd08b..3b52f7afc 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/curr_symbol.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/curr_symbol.pass.cpp
index 8dc4726e2..7b3b75a19 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/curr_symbol.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/curr_symbol.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -72,4 +71,6 @@ int main()
         Fwt f(1);
         assert(f.curr_symbol() == std::wstring());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/decimal_point.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/decimal_point.pass.cpp
index 66262dc43..34d02032c 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/decimal_point.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/decimal_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -72,4 +71,6 @@ int main()
         Fwt f(1);
         assert(f.decimal_point() == std::numeric_limits<wchar_t>::max());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/frac_digits.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/frac_digits.pass.cpp
index 0622342ff..50365584d 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/frac_digits.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/frac_digits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -72,4 +71,6 @@ int main()
         Fwt f(1);
         assert(f.frac_digits() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/grouping.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/grouping.pass.cpp
index fc857d658..9e12e3220 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/grouping.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/grouping.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -72,4 +71,6 @@ int main()
         Fwt f(1);
         assert(f.grouping() == std::string());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/neg_format.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/neg_format.pass.cpp
index d1df09cdf..cb5119909 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/neg_format.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/neg_format.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -85,4 +84,6 @@ int main()
         assert(p.field[2] == std::money_base::none);
         assert(p.field[3] == std::money_base::value);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/negative_sign.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/negative_sign.pass.cpp
index 1664c5537..6f134e784 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/negative_sign.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/negative_sign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -73,4 +72,6 @@ int main()
         Fwt f(1);
         assert(f.negative_sign() == L"-");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/pos_format.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/pos_format.pass.cpp
index 6e28154c5..bff44a69d 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/pos_format.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/pos_format.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -85,4 +84,6 @@ int main()
         assert(p.field[2] == std::money_base::none);
         assert(p.field[3] == std::money_base::value);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/positive_sign.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/positive_sign.pass.cpp
index 5ec8d9a54..8686e2005 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/positive_sign.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/positive_sign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -72,4 +71,6 @@ int main()
         Fwt f(1);
         assert(f.positive_sign() == std::wstring());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/thousands_sep.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/thousands_sep.pass.cpp
index 27db562ff..42d28d096 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/thousands_sep.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.members/thousands_sep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
         : std::moneypunct<wchar_t, true>(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         Fnf f(1);
@@ -72,4 +71,6 @@ int main()
         Fwt f(1);
         assert(f.thousands_sep() == std::numeric_limits<wchar_t>::max());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/locale.moneypunct.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/money_base.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/money_base.pass.cpp
index a0c17dcae..58f04905a 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/money_base.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/money_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::money_base mb; ((void)mb);
     static_assert(std::money_base::none == 0, "");
@@ -30,4 +29,6 @@ int main()
     static_assert(sizeof(std::money_base::pattern) == 4, "");
     std::money_base::pattern p;
     p.field[0] = std::money_base::none;
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/types.pass.cpp b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/types.pass.cpp
index 8998bf004..24ddadfb3 100644
--- a/test/std/localization/locale.categories/category.monetary/locale.moneypunct/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/locale.moneypunct/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@
 template <class T>
 void test(const T &) {}
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::moneypunct<char> >::value), "");
     static_assert((std::is_base_of<std::locale::facet, std::moneypunct<wchar_t> >::value), "");
@@ -45,4 +44,6 @@ int main()
     test(std::moneypunct<char, true>::intl);
     test(std::moneypunct<wchar_t, false>::intl);
     test(std::moneypunct<wchar_t, true>::intl);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.monetary/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/category.monetary/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.monetary/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/category.monetary/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/ctor.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/ctor.pass.cpp
index f801e6c5a..5a3af4b95 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_bool.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_bool.pass.cpp
index 4f6f0b47e..79aa68dde 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_bool.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ protected:
     virtual string_type do_falsename() const {return "no";}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     {
@@ -97,4 +96,6 @@ int main()
             assert(ex == "yes");
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
index 596f8f80f..062d5cfd4 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17877,7 +17876,7 @@ void test8()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -17887,4 +17886,6 @@ int main()
     test6();
     test7();
     test8();
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long.pass.cpp
index 1a0a7663d..1aee8bdfe 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     {
@@ -341,4 +340,6 @@ int main()
         assert(ex == "-***1_00_0");
         assert(ios.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
index cdd163980..3e71a1dfb 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26207,7 +26206,7 @@ void test12()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -26247,4 +26246,6 @@ int main()
     {
         long double v = std::nan(""); ((void)v);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_long.pass.cpp
index 55f7d0f9f..a3c49d36a 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     {
@@ -341,4 +340,6 @@ int main()
         assert(ex == "-***1_00_0");
         assert(ios.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_pointer.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_pointer.pass.cpp
index 4d8c2af38..d366c3842 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_pointer.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     {
@@ -46,4 +45,6 @@ int main()
         assert(rc > 0);
         assert(ex == expected_str);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long.pass.cpp
index cfa6382a4..420d22fb0 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     {
@@ -344,4 +343,6 @@ int main()
                                                  : "18_446_744_073_709_550_61_6"));
         assert(ios.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long_long.pass.cpp
index eaf670972..1ad3065c0 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_unsigned_long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     {
@@ -341,4 +340,6 @@ int main()
         assert(ex == "18_446_744_073_709_550_61_6");
         assert(ios.width() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.nm.put/types.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.nm.put/types.pass.cpp
index f6f1e5c21..6011c75c1 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.nm.put/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.nm.put/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::num_put<char> >::value), "");
     static_assert((std::is_base_of<std::locale::facet, std::num_put<wchar_t> >::value), "");
@@ -29,4 +28,6 @@ int main()
     static_assert((std::is_same<std::num_put<wchar_t>::char_type, wchar_t>::value), "");
     static_assert((std::is_same<std::num_put<char>::iter_type, std::ostreambuf_iterator<char> >::value), "");
     static_assert((std::is_same<std::num_put<wchar_t>::iter_type, std::ostreambuf_iterator<wchar_t> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/ctor.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/ctor.pass.cpp
index 71af9cdc7..096939d08 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_bool.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_bool.pass.cpp
index f2cc2e796..b577d96b7 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_bool.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ protected:
     virtual string_type do_falsename() const {return "ab";}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -227,4 +226,6 @@ int main()
         assert(err == ios.goodbit);
         assert(b == true);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_double.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_double.pass.cpp
index e3367b26f..3980d488d 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_double.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -49,7 +48,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -279,4 +278,6 @@ int main()
         assert(err == ios.goodbit);
         assert(std::abs(v - 3.14159265358979e+10)/3.14159265358979e+10 < 1.e-8);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_float.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_float.pass.cpp
index 174312d09..1ac313f7d 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_float.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_float.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -36,7 +35,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -209,4 +208,6 @@ int main()
         assert(err == ios.goodbit);
         assert(v == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp
index 570b8306c..135117286 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -518,4 +517,6 @@ int main()
         assert(err == ios.failbit);
         assert(v == std::numeric_limits<long>::max());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_double.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_double.pass.cpp
index cf671b000..49e8ae750 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_double.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -36,7 +35,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -268,4 +267,6 @@ int main()
         assert(err == ios.goodbit);
         assert(v == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_long.pass.cpp
index 86e64e622..c3a66a983 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -103,4 +102,6 @@ int main()
         const long long expect = 0x8000000000000000LL;
         assert(v == expect);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_pointer.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_pointer.pass.cpp
index c290722f3..23b6ad932 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_pointer.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -58,4 +57,6 @@ int main()
         assert(err == ios.goodbit);
         assert(p == (void*)0x73);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_int.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_int.pass.cpp
index 0665bf2ac..8a1ee3914 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_int.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -80,4 +79,6 @@ int main()
         assert(err == ios.goodbit);
         assert(v == 0xFFFFFFFF);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long.pass.cpp
index 03fa3d777..e97c460c7 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -80,4 +79,6 @@ int main()
         assert(err == ios.goodbit);
         assert(v == 0xFFFFFFFF);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long_long.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long_long.pass.cpp
index dcf4bf199..a5d57df05 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long_long.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_long_long.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -80,4 +79,6 @@ int main()
         assert(err == ios.goodbit);
         assert(v == 0xFFFFFFFFFFFFFFFFULL);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_short.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_short.pass.cpp
index 283c8e63d..261cac372 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_short.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_unsigned_short.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ protected:
     virtual std::string do_grouping() const {return std::string("\1\2\3");}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -80,4 +79,6 @@ int main()
         assert(err == ios.goodbit);
         assert(v == 0xFFFF);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_min_max.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_min_max.pass.cpp
index e2218fffb..92cbeda61 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_min_max.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_min_max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ void check_limits()
     }
 }
 
-int main(void)
+int main(int, char**)
 {
     check_limits<short>();
     check_limits<unsigned short>();
@@ -62,4 +61,6 @@ int main(void)
     check_limits<unsigned long>();
     check_limits<long long>();
     check_limits<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp
index 712d2897d..07a22cb6e 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -149,7 +148,7 @@ void test_negate() {
     }
 }
 
-int main(void)
+int main(int, char**)
 {
     test_neg_one<long>();
     test_neg_one<long long>();
@@ -162,4 +161,6 @@ int main(void)
     test_negate<unsigned int>();
     test_negate<unsigned long>();
     test_negate<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/locale.num.get/types.pass.cpp b/test/std/localization/locale.categories/category.numeric/locale.num.get/types.pass.cpp
index b87b4b99b..42f210d39 100644
--- a/test/std/localization/locale.categories/category.numeric/locale.num.get/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/locale.num.get/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::num_get<char> >::value), "");
     static_assert((std::is_base_of<std::locale::facet, std::num_get<wchar_t> >::value), "");
@@ -29,4 +28,6 @@ int main()
     static_assert((std::is_same<std::num_get<wchar_t>::char_type, wchar_t>::value), "");
     static_assert((std::is_same<std::num_get<char>::iter_type, std::istreambuf_iterator<char> >::value), "");
     static_assert((std::is_same<std::num_get<wchar_t>::iter_type, std::istreambuf_iterator<wchar_t> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.numeric/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/category.numeric/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.numeric/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/category.numeric/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order.pass.cpp
index 963974d11..30624ecc8 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const my_facet f(LOCALE_en_US_UTF_8, 1);
@@ -52,4 +51,6 @@ int main()
         const my_facet f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.date_order() == std::time_base::ymd);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order_wide.pass.cpp
index c44debf35..d62071b94 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/date_order_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const my_facet f(LOCALE_en_US_UTF_8, 1);
@@ -52,4 +51,6 @@ int main()
         const my_facet f(LOCALE_zh_CN_UTF_8, 1);
         assert(f.date_order() == std::time_base::ymd);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date.pass.cpp
index 2b6ade5c0..e5b591325 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -45,7 +44,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -99,4 +98,6 @@ int main()
         assert(t.tm_year == 109);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date_wide.pass.cpp
index ec1e3e7c9..5506e4cac 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_date_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -45,7 +44,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -98,4 +97,6 @@ int main()
         assert(t.tm_year == 109);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname.pass.cpp
index 931ab5d40..5311a8565 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -72,4 +71,6 @@ int main()
         assert(t.tm_mon == 5);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname_wide.pass.cpp
index 551f298b0..e45260a66 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_monthname_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ public:
         : F2(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -81,4 +80,6 @@ int main()
         assert(t.tm_mon == 5);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one.pass.cpp
index 6cf3b6aef..bda40c56d 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -43,7 +42,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -168,4 +167,6 @@ int main()
         assert(t.tm_hour == 23);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one_wide.pass.cpp
index 1e7c170da..d8715f825 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_one_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -43,7 +42,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -170,4 +169,6 @@ int main()
         assert(t.tm_hour == 23);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time.pass.cpp
index 8cea95de8..a007415d0 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -91,4 +90,6 @@ int main()
         assert(t.tm_sec == 15);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time_wide.pass.cpp
index 452a35440..0e2481d6a 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_time_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -91,4 +90,6 @@ int main()
         assert(t.tm_sec == 15);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday.pass.cpp
index 09055add7..308b08529 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -88,4 +87,6 @@ int main()
         assert(t.tm_wday == 1);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday_wide.pass.cpp
index 31135a349..c52462e37 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_weekday_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -86,4 +85,6 @@ int main()
         assert(t.tm_wday == 1);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year.pass.cpp
index 676e7fff8..09df42371 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -82,4 +81,6 @@ int main()
         assert(t.tm_year == 109);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year_wide.pass.cpp
index 1bdb8de60..78c35e969 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get.byname/get_year_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     std::ios ios(0);
     std::ios_base::iostate err;
@@ -82,4 +81,6 @@ int main()
         assert(t.tm_year == 109);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/ctor.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/ctor.pass.cpp
index c6c4359e4..6fb9899de 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/date_order.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/date_order.pass.cpp
index 264494ba6..47b06e9df 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/date_order.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/date_order.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     assert(f.date_order() == std::time_base::mdy);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date.pass.cpp
index 6b8bd73be..1a1dae754 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -48,4 +47,6 @@ int main()
         assert(t.tm_year == 105);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date_wide.pass.cpp
index 4c663a3bc..1fe184bea 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_date_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -48,4 +47,6 @@ int main()
         assert(t.tm_year == 105);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_many.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_many.pass.cpp
index 39a10b48a..2416f6275 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_many.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_many.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -65,4 +64,6 @@ int main()
         assert(t.tm_min == 27);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname.pass.cpp
index 19e378ce8..8e61dcca8 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -262,4 +261,6 @@ int main()
         assert(t.tm_mon == 0);
         assert(err == std::ios_base::failbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname_wide.pass.cpp
index 1761a6d8c..a8eb4864e 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_monthname_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -262,4 +261,6 @@ int main()
         assert(t.tm_mon == 0);
         assert(err == std::ios_base::failbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_one.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_one.pass.cpp
index 05182c288..0c6d9085b 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_one.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -302,4 +301,6 @@ int main()
         assert(i.base() == in+sizeof(in)-1);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time.pass.cpp
index b8b05f6dc..ca0227973 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -114,4 +113,6 @@ int main()
 //         assert(t.tm_sec == 0);
         assert(err == std::ios_base::failbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time_wide.pass.cpp
index 679d05840..98f2a8570 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_time_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -114,4 +113,6 @@ int main()
 //         assert(t.tm_sec == 0);
         assert(err == std::ios_base::failbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday.pass.cpp
index 918a9026f..16e853a49 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -217,4 +216,6 @@ int main()
         assert(t.tm_wday == 6);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday_wide.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday_wide.pass.cpp
index 5212eb12b..3b7b4e9d8 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday_wide.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_weekday_wide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -217,4 +216,6 @@ int main()
         assert(t.tm_wday == 6);
         assert(err == std::ios_base::eofbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_year.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_year.pass.cpp
index 6e5e04d25..8a0b84059 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_year.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.members/get_year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     std::ios ios(0);
@@ -135,4 +134,6 @@ int main()
         assert(t.tm_year == 1099);
         assert(err == std::ios_base::goodbit);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/locale.time.get.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/time_base.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/time_base.pass.cpp
index 9045ecbe5..c1b509b40 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/time_base.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/time_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::time_base::dateorder d = std::time_base::no_order;
     ((void)d); // Prevent unused warning
@@ -27,4 +26,6 @@ int main()
     assert(std::time_base::mdy == 2);
     assert(std::time_base::ymd == 3);
     assert(std::time_base::ydm == 4);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.get/types.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.get/types.pass.cpp
index f434ea577..bd74f7da8 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.get/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.get/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::time_get<char> >::value), "");
     static_assert((std::is_base_of<std::locale::facet, std::time_get<wchar_t> >::value), "");
@@ -38,4 +37,6 @@ int main()
     static_assert((std::is_same<std::time_get<wchar_t>::char_type, wchar_t>::value), "");
     static_assert((std::is_same<std::time_get<char>::iter_type, std::istreambuf_iterator<char> >::value), "");
     static_assert((std::is_same<std::time_get<wchar_t>::iter_type, std::istreambuf_iterator<wchar_t> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.put.byname/put1.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.put.byname/put1.pass.cpp
index 8e79357b5..cd7013327 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.put.byname/put1.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.put.byname/put1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -46,7 +45,7 @@ public:
         : F(nm, refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     char str[200];
     output_iterator<char*> iter;
@@ -78,4 +77,6 @@ int main()
         assert((ex == "Today is Samedi which is abbreviated Sam.")||
                (ex == "Today is samedi which is abbreviated sam." ));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.put/ctor.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.put/ctor.pass.cpp
index c22980a69..9d0ec1ad7 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.put/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.put/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
 
 int my_facet::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet);
@@ -49,4 +48,6 @@ int main()
         assert(my_facet::count == 1);
     }
     assert(my_facet::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put1.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put1.pass.cpp
index 93d595206..94faa80f1 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put1.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     char str[200];
@@ -58,4 +57,6 @@ int main()
         std::string ex(str, iter.base());
         assert(ex == "The number of the month is 05.");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put2.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put2.pass.cpp
index d9e7f3cd5..a3b6cf5b2 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put2.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.members/put2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ public:
         : F(refs) {}
 };
 
-int main()
+int main(int, char**)
 {
     const my_facet f(1);
     char str[200];
@@ -329,4 +328,6 @@ int main()
         std::string ex(str, iter.base());
         assert(ex == "%");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.put/locale.time.put.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/locale.time.put/types.pass.cpp b/test/std/localization/locale.categories/category.time/locale.time.put/types.pass.cpp
index db9d3fbf4..4361094f4 100644
--- a/test/std/localization/locale.categories/category.time/locale.time.put/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/locale.time.put/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <iterator>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::locale::facet, std::time_put<char> >::value), "");
     static_assert((std::is_base_of<std::locale::facet, std::time_put<wchar_t> >::value), "");
@@ -29,4 +28,6 @@ int main()
     static_assert((std::is_same<std::time_put<wchar_t>::char_type, wchar_t>::value), "");
     static_assert((std::is_same<std::time_put<char>::iter_type, std::ostreambuf_iterator<char> >::value), "");
     static_assert((std::is_same<std::time_put<wchar_t>::iter_type, std::ostreambuf_iterator<wchar_t> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/category.time/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/category.time/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/category.time/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/category.time/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/decimal_point.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/decimal_point.pass.cpp
index 0617cdc52..f8132872d 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/decimal_point.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/decimal_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l("C");
@@ -62,4 +61,6 @@ int main()
             assert(np.decimal_point() == L',');
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/grouping.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/grouping.pass.cpp
index 1f2aeeabd..4dbc7e7b8 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/grouping.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/grouping.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l("C");
@@ -71,4 +70,6 @@ int main()
             assert(np.grouping() == group);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/thousands_sep.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/thousands_sep.pass.cpp
index b84f3a1c7..256900240 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/thousands_sep.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct.byname/thousands_sep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -27,7 +26,7 @@
 #include "test_macros.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l("C");
@@ -85,4 +84,6 @@ int main()
             assert(np.thousands_sep() == wsep);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/ctor.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/ctor.pass.cpp
index 6ac459698..e3a10a5c3 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/ctor.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ public:
 
 template <class C> int my_facet<C>::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l(std::locale::classic(), new my_facet<char>);
@@ -63,4 +62,6 @@ int main()
         assert(my_facet<wchar_t>::count == 1);
     }
     assert(my_facet<wchar_t>::count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/decimal_point.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/decimal_point.pass.cpp
index c89e3f4cc..5322c8a87 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/decimal_point.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/decimal_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -29,4 +28,6 @@ int main()
         const std::numpunct<C>& np = std::use_facet<std::numpunct<C> >(l);
         assert(np.decimal_point() == L'.');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/falsename.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/falsename.pass.cpp
index b48005586..d1f20f3bb 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/falsename.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/falsename.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -29,4 +28,6 @@ int main()
         const std::numpunct<C>& np = std::use_facet<std::numpunct<C> >(l);
         assert(np.falsename() == std::wstring(L"false"));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/grouping.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/grouping.pass.cpp
index f2935ba92..4c23c51ac 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/grouping.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/grouping.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -29,4 +28,6 @@ int main()
         const std::numpunct<C>& np = std::use_facet<std::numpunct<C> >(l);
         assert(np.grouping() == std::string());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/thousands_sep.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/thousands_sep.pass.cpp
index 19932d654..2044c98a1 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/thousands_sep.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/thousands_sep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -29,4 +28,6 @@ int main()
         const std::numpunct<C>& np = std::use_facet<std::numpunct<C> >(l);
         assert(np.thousands_sep() == L',');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/truename.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/truename.pass.cpp
index aa426d0fb..359c96bef 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/truename.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.members/truename.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -29,4 +28,6 @@ int main()
         const std::numpunct<C>& np = std::use_facet<std::numpunct<C> >(l);
         assert(np.truename() == std::wstring(L"true"));
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.virtuals/tested_elsewhere.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.virtuals/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.virtuals/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/facet.numpunct.virtuals/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/types.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/types.pass.cpp
index 967a4f4b2..212670af4 100644
--- a/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/types.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/locale.numpunct/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l = std::locale::classic();
     {
@@ -47,4 +46,6 @@ int main()
         static_assert((std::is_same<std::numpunct<wchar_t>::string_type, std::wstring>::value), "");
         static_assert((std::is_base_of<std::locale::facet, std::numpunct<wchar_t> >::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facet.numpunct/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/facet.numpunct/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/facet.numpunct/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/facet.numpunct/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.categories/facets.examples/nothing_to_do.pass.cpp b/test/std/localization/locale.categories/facets.examples/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.categories/facets.examples/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.categories/facets.examples/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
index ac35fb852..def721c4a 100644
--- a/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::consume_header == 4);
     assert(std::generate_header == 2);
     assert(std::little_endian == 1);
     std::codecvt_mode e = std::consume_header;
     assert(e == 4);
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
index a61a9c928..a66129610 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "count_new.hpp"
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -39,4 +38,6 @@ int main()
         assert(globalMemCounter.checkOutstandingNewNotEq(0));
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
index 0b7d4cbf3..6bd37789d 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf16<wchar_t> C;
@@ -42,4 +41,6 @@ int main()
         bool r = c.always_noconv();
         assert(r == false);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
index 2d12d985b..2e8a1833c 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf16<wchar_t> C;
@@ -42,4 +41,6 @@ int main()
         int r = c.encoding();
         assert(r == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
index 56d6262d0..4ccf933d6 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf16<char32_t> C;
@@ -736,4 +735,6 @@ int main()
         assert(np == n+2);
         assert(w == 0x56);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
index 463a9fbac..39ecb8f0e 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf16<wchar_t> C;
@@ -446,4 +445,6 @@ int main()
         r = c.length(m, n, n+2, 2);
         assert(r == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
index 29bb58d56..fa8c3269a 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf16<wchar_t> C;
@@ -60,4 +59,6 @@ int main()
         int r = c.max_length();
         assert(r == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
index b90c41e59..beabf842e 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -347,7 +346,9 @@ void TestHelper<CharT, 4>::test() {
   }
 }
 
-int main() {
+int main(int, char**) {
   TestHelper<char32_t>::test();
   TestHelper<wchar_t>::test();
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
index 463d2f925..2c37e2578 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf16<wchar_t> C;
@@ -53,4 +52,6 @@ int main()
         std::codecvt_base::result r = c.unshift(m, n, n+4, np);
         assert(r == std::codecvt_base::noconv);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
index 5fa0eaaf8..450f52509 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "count_new.hpp"
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -39,4 +38,6 @@ int main()
         assert(globalMemCounter.checkOutstandingNewNotEq(0));
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
index 963c269fa..7d7ba19be 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<wchar_t> C;
@@ -42,4 +41,6 @@ int main()
         bool r = c.always_noconv();
         assert(r == false);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
index b17752cb0..d8e689f62 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<wchar_t> C;
@@ -42,4 +41,6 @@ int main()
         int r = c.encoding();
         assert(r == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
index 308bb9da2..611d06305 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<char32_t> C;
@@ -357,4 +356,6 @@ int main()
         assert(np == n+1);
         assert(w == 0x56);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
index 7239b4c8f..2df1c9603 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<wchar_t> C;
@@ -241,4 +240,6 @@ int main()
         r = c.length(m, n, n+1, 3);
         assert(r == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
index 70e23f8f5..57e5f5850 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<wchar_t> C;
@@ -60,4 +59,6 @@ int main()
         int r = c.max_length();
         assert(r == 7);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
index 886fc4416..f8b56bcb6 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -319,8 +318,10 @@ void TestHelper<CharT, 4>::test() {
   }
 }
 
-int main() {
+int main(int, char**) {
   TestHelper<wchar_t>::test();
   TestHelper<char32_t>::test();
   TestHelper<char16_t>::test();
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
index 1f0c237d0..a41f99797 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<wchar_t> C;
@@ -53,4 +52,6 @@ int main()
         std::codecvt_base::result r = c.unshift(m, n, n+4, np);
         assert(r == std::codecvt_base::noconv);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
index 7690e6193..c7fe09caf 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8_utf16<wchar_t> C;
@@ -42,4 +41,6 @@ int main()
         bool r = c.always_noconv();
         assert(r == false);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
index bc178800f..595f7888e 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8_utf16<wchar_t> C;
@@ -42,4 +41,6 @@ int main()
         int r = c.encoding();
         assert(r == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
index 392d66f22..482521032 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -235,10 +234,12 @@ void TestHelper<CharT, 4>::test() {
   }
 }
 
-int main() {
+int main(int, char**) {
 #ifndef _WIN32
   TestHelper<wchar_t>::test();
 #endif
   TestHelper<char32_t>::test();
   TestHelper<char16_t>::test();
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
index 8f5be81e6..33a4b5f04 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8_utf16<wchar_t> C;
@@ -232,4 +231,6 @@ int main()
         r = c.length(m, n, n+1, 2);
         assert(r == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
index ef4d0b827..5d93d929e 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8_utf16<wchar_t> C;
@@ -60,4 +59,6 @@ int main()
         int r = c.max_length();
         assert(r == 7);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
index ced2a36a4..89908eb77 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -300,10 +299,12 @@ void TestHelper<CharT, 4>::test() {
   }
 }
 
-int main() {
+int main(int, char**) {
 #ifndef _WIN32
   TestHelper<wchar_t>::test();
 #endif
   TestHelper<char32_t>::test();
   TestHelper<char16_t>::test();
+
+  return 0;
 }
diff --git a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
index 2bcade01f..79b670055 100644
--- a/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
+++ b/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8_utf16<wchar_t> C;
@@ -53,4 +52,6 @@ int main()
         std::codecvt_base::result r = c.unshift(m, n, n+4, np);
         assert(r == std::codecvt_base::noconv);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locale.syn/nothing_to_do.pass.cpp b/test/std/localization/locale.syn/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locale.syn/nothing_to_do.pass.cpp
+++ b/test/std/localization/locale.syn/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isalnum.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isalnum.pass.cpp
index 376b33460..2cf9e4b57 100644
--- a/test/std/localization/locales/locale.convenience/classification/isalnum.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isalnum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::isalnum(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert( std::isalnum('f', l));
     assert( std::isalnum('9', l));
     assert(!std::isalnum('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isalpha.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isalpha.pass.cpp
index d1a0e6912..800c26cb9 100644
--- a/test/std/localization/locales/locale.convenience/classification/isalpha.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isalpha.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::isalpha(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert( std::isalpha('f', l));
     assert(!std::isalpha('9', l));
     assert(!std::isalpha('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/iscntrl.pass.cpp b/test/std/localization/locales/locale.convenience/classification/iscntrl.pass.cpp
index 0bd45ac6b..d5cd4a6b9 100644
--- a/test/std/localization/locales/locale.convenience/classification/iscntrl.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/iscntrl.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::iscntrl(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert(!std::iscntrl('f', l));
     assert(!std::iscntrl('9', l));
     assert(!std::iscntrl('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isdigit.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isdigit.pass.cpp
index bdc063286..2e71bd394 100644
--- a/test/std/localization/locales/locale.convenience/classification/isdigit.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isdigit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::isdigit(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert(!std::isdigit('f', l));
     assert( std::isdigit('9', l));
     assert(!std::isdigit('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isgraph.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isgraph.pass.cpp
index b294aa537..406b7cbf9 100644
--- a/test/std/localization/locales/locale.convenience/classification/isgraph.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isgraph.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::isgraph(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert( std::isgraph('f', l));
     assert( std::isgraph('9', l));
     assert( std::isgraph('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/islower.pass.cpp b/test/std/localization/locales/locale.convenience/classification/islower.pass.cpp
index e131e50b3..2fc9ece02 100644
--- a/test/std/localization/locales/locale.convenience/classification/islower.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/islower.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::islower(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert( std::islower('f', l));
     assert(!std::islower('9', l));
     assert(!std::islower('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isprint.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isprint.pass.cpp
index a8c39fae9..36fa16cbc 100644
--- a/test/std/localization/locales/locale.convenience/classification/isprint.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isprint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert( std::isprint(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert( std::isprint('f', l));
     assert( std::isprint('9', l));
     assert( std::isprint('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/ispunct.pass.cpp b/test/std/localization/locales/locale.convenience/classification/ispunct.pass.cpp
index b606d3262..db1133780 100644
--- a/test/std/localization/locales/locale.convenience/classification/ispunct.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/ispunct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::ispunct(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert(!std::ispunct('f', l));
     assert(!std::ispunct('9', l));
     assert( std::ispunct('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isspace.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isspace.pass.cpp
index 884b30338..62e50d2fc 100644
--- a/test/std/localization/locales/locale.convenience/classification/isspace.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isspace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert( std::isspace(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert(!std::isspace('f', l));
     assert(!std::isspace('9', l));
     assert(!std::isspace('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isupper.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isupper.pass.cpp
index 8ce51bc70..c986c7cdd 100644
--- a/test/std/localization/locales/locale.convenience/classification/isupper.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isupper.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::isupper(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert(!std::isupper('f', l));
     assert(!std::isupper('9', l));
     assert(!std::isupper('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/classification/isxdigit.pass.cpp b/test/std/localization/locales/locale.convenience/classification/isxdigit.pass.cpp
index 340769557..245f2ed60 100644
--- a/test/std/localization/locales/locale.convenience/classification/isxdigit.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/classification/isxdigit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(!std::isxdigit(' ', l));
@@ -28,4 +27,6 @@ int main()
     assert( std::isxdigit('f', l));
     assert( std::isxdigit('9', l));
     assert(!std::isxdigit('+', l));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp
index 6f0994a00..f28abb934 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "count_new.hpp"
 
-int main()
+int main(int, char**)
 {
     typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > B;
 #if TEST_STD_VER > 11
@@ -56,4 +55,6 @@ int main()
         assert(globalMemCounter.checkOutstandingNewNotEq(0));
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp
index 24706b5a8..7c4042885 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct test_buf
     virtual int_type overflow(int_type c = traits_type::eof()) {return base::overflow(c);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ofstream bs("overflow.dat");
@@ -97,4 +96,6 @@ int main()
         assert(f.get() == -1);
     }
     std::remove("overflow.dat");
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp
index bcfb16e05..dc4144b15 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct test_buf
     virtual int_type pbackfail(int_type c = traits_type::eof()) {return base::pbackfail(c);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream bs("underflow.dat");
@@ -56,4 +55,6 @@ int main()
         assert(f.sbumpc() == L'2');
         assert(f.sgetc() == L'3');
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp
index ffd813f86..b58d1d8eb 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > B;
     {
@@ -28,4 +27,6 @@ int main()
         b.rdbuf(s.rdbuf());
         assert(b.rdbuf() == s.rdbuf());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
index aa9d5e8a9..b50f10cc1 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ public:
     ~test_codecvt() {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         wchar_t buf[10];
@@ -55,4 +54,6 @@ int main()
         assert(f.sgetc() == L'l');
     }
     std::remove("seekoff.dat");
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
index aba76df0b..0541dbfb9 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > B;
     {
@@ -26,4 +25,6 @@ int main()
         std::mbstate_t s = b.state();
         ((void)s);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp
index 189ec2bdd..e309f3eb6 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::ofstream bytestream("myfile.txt");
@@ -33,4 +32,6 @@ int main()
         assert(ws == L"Hello");
     }
     std::remove("myfile.txt");
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp
index 9c08a353f..6d04935b3 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct test_buf
     virtual int_type underflow() {return base::underflow();}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::ifstream bs("underflow.dat");
@@ -81,4 +80,6 @@ int main()
         assert(f.sbumpc() == 0x4E53);
         assert(f.sbumpc() == test_buf::traits_type::eof());
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.character/tolower.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.character/tolower.pass.cpp
index 8c66ad141..9885dca53 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.character/tolower.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.character/tolower.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(std::tolower(' ', l) == ' ');
@@ -28,4 +27,6 @@ int main()
     assert(std::tolower('f', l) == 'f');
     assert(std::tolower('9', l) == '9');
     assert(std::tolower('+', l) == '+');
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.character/toupper.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.character/toupper.pass.cpp
index 3299a3d00..34f675b05 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.character/toupper.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.character/toupper.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::locale l;
     assert(std::toupper(' ', l) == ' ');
@@ -28,4 +27,6 @@ int main()
     assert(std::toupper('f', l) == 'F');
     assert(std::toupper('9', l) == '9');
     assert(std::toupper('+', l) == '+');
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
index 480628f70..802aaf65d 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,4 +61,6 @@ void TestHelper<CharT, 4>::test() {
   }
 }
 
-int main() { TestHelper<wchar_t>::test(); }
+int main(int, char**) { TestHelper<wchar_t>::test(); 
+  return 0;
+}
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp
index b56b72fb0..3efd26fb4 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<wchar_t> Codecvt;
@@ -37,4 +36,6 @@ int main()
         static_assert( std::is_constructible<Myconv, Codecvt*>::value, "");
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp
index 7651f8ac3..6e2d5ff5e 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::codecvt_utf8<wchar_t> Codecvt;
@@ -25,4 +24,6 @@ int main()
         Myconv myconv(new Codecvt, std::mbstate_t());
         assert(myconv.converted() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp
index 72e79dfb1..d035c3160 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 #include <codecvt>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt_utf8<wchar_t> Codecvt;
     typedef std::wstring_convert<Codecvt> Myconv;
     static_assert(!std::is_copy_constructible<Myconv>::value, "");
     static_assert(!std::is_copy_assignable<Myconv>::value, "");
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp
index 6d3947fed..e284c13c0 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt_utf8<wchar_t> Codecvt;
     typedef std::wstring_convert<Codecvt> Myconv;
@@ -71,4 +70,6 @@ int main()
         std::wstring ws = myconv.from_bytes('\xA5');
         assert(ws == L"wide error");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
index 2e627b739..c1a26d055 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,4 +68,6 @@ void TestHelper<CharT, 4>::test() {
   }
 }
 
-int main() { TestHelper<wchar_t>::test(); }
+int main(int, char**) { TestHelper<wchar_t>::test(); 
+  return 0;
+}
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp
index a7a816b37..a7588dc25 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <locale>
 #include <codecvt>
 
-int main()
+int main(int, char**)
 {
     typedef std::codecvt_utf8<wchar_t> Codecvt;
     typedef std::wstring_convert<Codecvt> Myconv;
     Myconv myconv;
     std::mbstate_t s = myconv.state();
     ((void)s);
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
index 0a6cab73b..397ba6494 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,4 +68,6 @@ void TestHelper<CharT, 4>::test() {
   }
 }
 
-int main() { TestHelper<wchar_t>::test(); }
+int main(int, char**) { TestHelper<wchar_t>::test(); 
+  return 0;
+}
diff --git a/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp
index d46c858fd..c2dea9a90 100644
--- a/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <locale>
 #include <codecvt>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::wstring_convert<std::codecvt_utf8<wchar_t> > myconv;
@@ -32,4 +31,6 @@ int main()
         static_assert((std::is_same<myconv::state_type, std::mbstate_t>::value), "");
         static_assert((std::is_same<myconv::int_type, std::char_traits<wchar_t>::int_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/conversions/nothing_to_do.pass.cpp b/test/std/localization/locales/locale.convenience/conversions/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locales/locale.convenience/conversions/nothing_to_do.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/conversions/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.convenience/nothing_to_do.pass.cpp b/test/std/localization/locales/locale.convenience/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locales/locale.convenience/nothing_to_do.pass.cpp
+++ b/test/std/localization/locales/locale.convenience/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.global.templates/has_facet.pass.cpp b/test/std/localization/locales/locale.global.templates/has_facet.pass.cpp
index 58767f059..66539d1ea 100644
--- a/test/std/localization/locales/locale.global.templates/has_facet.pass.cpp
+++ b/test/std/localization/locales/locale.global.templates/has_facet.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,11 +21,13 @@ struct my_facet
 
 std::locale::id my_facet::id;
 
-int main()
+int main(int, char**)
 {
     std::locale loc;
     assert(std::has_facet<std::ctype<char> >(loc));
     assert(!std::has_facet<my_facet>(loc));
     std::locale loc2(loc, new my_facet);
     assert(std::has_facet<my_facet>(loc2));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale.global.templates/use_facet.pass.cpp b/test/std/localization/locales/locale.global.templates/use_facet.pass.cpp
index 2dba4b68e..3c2cb6042 100644
--- a/test/std/localization/locales/locale.global.templates/use_facet.pass.cpp
+++ b/test/std/localization/locales/locale.global.templates/use_facet.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct my_facet
 
 std::locale::id my_facet::id;
 
-int main()
+int main(int, char**)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     try
@@ -54,4 +53,6 @@ int main()
         assert(facet_count == 1);
     }
     assert(facet_count == 0);
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/assign.pass.cpp b/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
index 8b31a8f97..369fee4cb 100644
--- a/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(LOCALE_ru_RU_UTF_8);
@@ -68,4 +67,6 @@ int main()
         check(loc2);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp b/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
index 7ba64b051..c324f394c 100644
--- a/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/char_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -62,7 +61,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(LOCALE_ru_RU_UTF_8);
@@ -95,4 +94,6 @@ int main()
         std::locale ok("");
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/copy.pass.cpp b/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
index 9e446e440..4f96ab415 100644
--- a/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(LOCALE_fr_FR_UTF_8);
@@ -65,4 +64,6 @@ int main()
         check(loc2);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/default.pass.cpp b/test/std/localization/locales/locale/locale.cons/default.pass.cpp
index 2bb3c9a80..5c1e922cb 100644
--- a/test/std/localization/locales/locale/locale.cons/default.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     int ok;
     {
@@ -74,4 +73,6 @@ int main()
         assert(globalMemCounter.checkOutstandingNewEq(ok));
     }
     assert(globalMemCounter.checkOutstandingNewEq(ok));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp b/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
index 6a79d3943..70f2cb92b 100644
--- a/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/locale_char_pointer_cat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(LOCALE_ru_RU_UTF_8);
@@ -69,4 +68,6 @@ int main()
         check(loc2);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp b/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
index 1144931e3..35c06ce50 100644
--- a/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/locale_facetptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ struct my_facet
 
 std::locale::id my_facet::id;
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(LOCALE_ru_RU_UTF_8);
@@ -86,4 +85,6 @@ int main()
         assert(loc == loc2);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp b/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
index 5bf6befed..ba54e8554 100644
--- a/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/locale_locale_cat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(LOCALE_ru_RU_UTF_8);
@@ -69,4 +68,6 @@ int main()
         check(loc2);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp b/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
index 946e8b530..3cb3aadac 100644
--- a/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(LOCALE_ru_RU_UTF_8);
@@ -70,4 +69,6 @@ int main()
         check(loc2);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.cons/string.pass.cpp b/test/std/localization/locales/locale/locale.cons/string.pass.cpp
index 6fc0808b2..55b2f88c2 100644
--- a/test/std/localization/locales/locale/locale.cons/string.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc(std::string(LOCALE_ru_RU_UTF_8));
@@ -70,4 +69,6 @@ int main()
         assert(loc != loc3);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.members/combine.pass.cpp b/test/std/localization/locales/locale/locale.members/combine.pass.cpp
index a9919f6a8..fc1f3d33b 100644
--- a/test/std/localization/locales/locale/locale.members/combine.pass.cpp
+++ b/test/std/localization/locales/locale/locale.members/combine.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ struct my_facet
 
 std::locale::id my_facet::id;
 
-int main()
+int main(int, char**)
 {
 {
     {
@@ -96,4 +95,6 @@ int main()
     assert(globalMemCounter.checkOutstandingNewEq(0));
 }
 #endif
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.members/name.pass.cpp b/test/std/localization/locales/locale/locale.members/name.pass.cpp
index 13ae27285..96ebdf391 100644
--- a/test/std/localization/locales/locale/locale.members/name.pass.cpp
+++ b/test/std/localization/locales/locale/locale.members/name.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::locale loc;
@@ -28,4 +27,6 @@ int main()
         std::locale loc(LOCALE_en_US_UTF_8);
         assert(loc.name() == LOCALE_en_US_UTF_8);
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.operators/compare.pass.cpp b/test/std/localization/locales/locale/locale.operators/compare.pass.cpp
index 40740520d..ea083d137 100644
--- a/test/std/localization/locales/locale/locale.operators/compare.pass.cpp
+++ b/test/std/localization/locales/locale/locale.operators/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <locale>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::locale l;
@@ -31,4 +30,6 @@ int main()
             assert(l(s3, s2));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.operators/eq.pass.cpp b/test/std/localization/locales/locale/locale.operators/eq.pass.cpp
index c809f49d2..1efb487bc 100644
--- a/test/std/localization/locales/locale/locale.operators/eq.pass.cpp
+++ b/test/std/localization/locales/locale/locale.operators/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     std::locale cloc;
     std::locale copy(cloc);
@@ -83,4 +82,6 @@ int main()
     assert(noname2 != noname1);
     assert(noname2 != nonamec);
     assert(noname2 == noname2);
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.statics/classic.pass.cpp b/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
index 078030ce4..7594edcc2 100644
--- a/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
+++ b/test/std/localization/locales/locale/locale.statics/classic.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,11 +48,13 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     std::locale loc = std::locale::classic();
     assert(loc.name() == "C");
     assert(loc == std::locale("C"));
     check(loc);
     check(std::locale("C"));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.statics/global.pass.cpp b/test/std/localization/locales/locale/locale.statics/global.pass.cpp
index d4b115514..57f55aa1a 100644
--- a/test/std/localization/locales/locale/locale.statics/global.pass.cpp
+++ b/test/std/localization/locales/locale/locale.statics/global.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ void check(const std::locale& loc)
     assert((std::has_facet<std::messages<wchar_t> >(loc)));
 }
 
-int main()
+int main(int, char**)
 {
     std::locale loc;
     assert(loc.name() == "C");
@@ -62,4 +61,6 @@ int main()
     std::locale loc2;
     check(loc2);
     assert(loc2 == std::locale(LOCALE_en_US_UTF_8));
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.types/locale.category/category.pass.cpp b/test/std/localization/locales/locale/locale.types/locale.category/category.pass.cpp
index dbab8212a..11c3de297 100644
--- a/test/std/localization/locales/locale/locale.types/locale.category/category.pass.cpp
+++ b/test/std/localization/locales/locale/locale.types/locale.category/category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -24,7 +23,7 @@ template <class T>
 void test(const T &) {}
 
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::locale::category, int>::value), "");
     assert(std::locale::none == 0);
@@ -56,4 +55,6 @@ int main()
     test(std::locale::time);
     test(std::locale::messages);
     test(std::locale::all);
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.types/locale.facet/tested_elsewhere.pass.cpp b/test/std/localization/locales/locale/locale.types/locale.facet/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locales/locale/locale.types/locale.facet/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locales/locale/locale.types/locale.facet/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.types/locale.id/tested_elsewhere.pass.cpp b/test/std/localization/locales/locale/locale.types/locale.id/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locales/locale/locale.types/locale.id/tested_elsewhere.pass.cpp
+++ b/test/std/localization/locales/locale/locale.types/locale.id/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/locale.types/nothing_to_do.pass.cpp b/test/std/localization/locales/locale/locale.types/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locales/locale/locale.types/nothing_to_do.pass.cpp
+++ b/test/std/localization/locales/locale/locale.types/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locales/locale/nothing_to_do.pass.cpp b/test/std/localization/locales/locale/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locales/locale/nothing_to_do.pass.cpp
+++ b/test/std/localization/locales/locale/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/locales/nothing_to_do.pass.cpp b/test/std/localization/locales/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/locales/nothing_to_do.pass.cpp
+++ b/test/std/localization/locales/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/localization/localization.general/nothing_to_do.pass.cpp b/test/std/localization/localization.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/localization/localization.general/nothing_to_do.pass.cpp
+++ b/test/std/localization/localization.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/nothing_to_do.pass.cpp b/test/std/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/nothing_to_do.pass.cpp
+++ b/test/std/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/c.math/cmath.pass.cpp b/test/std/numerics/c.math/cmath.pass.cpp
index b02bdbe64..3f9a5f557 100644
--- a/test/std/numerics/c.math/cmath.pass.cpp
+++ b/test/std/numerics/c.math/cmath.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1515,7 +1514,7 @@ void test_trunc()
     assert(std::trunc(1) == 1);
 }
 
-int main()
+int main(int, char**)
 {
     test_abs();
     test_acos();
@@ -1587,4 +1586,6 @@ int main()
     test_scalbn();
     test_tgamma();
     test_trunc();
+
+  return 0;
 }
diff --git a/test/std/numerics/c.math/ctgmath.pass.cpp b/test/std/numerics/c.math/ctgmath.pass.cpp
index 24908ff03..4cba6031a 100644
--- a/test/std/numerics/c.math/ctgmath.pass.cpp
+++ b/test/std/numerics/c.math/ctgmath.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,10 +10,12 @@
 
 #include <ctgmath>
 
-int main()
+int main(int, char**)
 {
     std::complex<double> cd;
     (void)cd;
     double x = std::sin(0);
     ((void)x); // Prevent unused warning
+
+  return 0;
 }
diff --git a/test/std/numerics/c.math/tgmath_h.pass.cpp b/test/std/numerics/c.math/tgmath_h.pass.cpp
index 65fc54ebd..3fab28b04 100644
--- a/test/std/numerics/c.math/tgmath_h.pass.cpp
+++ b/test/std/numerics/c.math/tgmath_h.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,6 +10,8 @@
 
 #include <tgmath.h>
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/cfenv/cfenv.syn/cfenv.pass.cpp b/test/std/numerics/cfenv/cfenv.syn/cfenv.pass.cpp
index f2bf6433c..613784392 100644
--- a/test/std/numerics/cfenv/cfenv.syn/cfenv.pass.cpp
+++ b/test/std/numerics/cfenv/cfenv.syn/cfenv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -58,7 +57,7 @@
 #error FE_DFL_ENV not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::fenv_t fenv;
     std::fexcept_t fex;
@@ -75,4 +74,6 @@ int main()
     static_assert((std::is_same<decltype(std::feholdexcept(&fenv)), int>::value), "");
     static_assert((std::is_same<decltype(std::fesetenv(&fenv)), int>::value), "");
     static_assert((std::is_same<decltype(std::feupdateenv(&fenv)), int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cases.h b/test/std/numerics/complex.number/cases.h
index a2f85d11c..6663245d2 100644
--- a/test/std/numerics/complex.number/cases.h
+++ b/test/std/numerics/complex.number/cases.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/numerics/complex.number/ccmplx/ccomplex.pass.cpp b/test/std/numerics/complex.number/ccmplx/ccomplex.pass.cpp
index 3e215c8bf..ad1f4c423 100644
--- a/test/std/numerics/complex.number/ccmplx/ccomplex.pass.cpp
+++ b/test/std/numerics/complex.number/ccmplx/ccomplex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,8 +10,10 @@
 
 #include <ccomplex>
 
-int main()
+int main(int, char**)
 {
     std::complex<double> d;
     (void)d;
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/UDT_is_rejected.fail.cpp b/test/std/numerics/complex.number/cmplx.over/UDT_is_rejected.fail.cpp
index 6a3ae48d7..bc0e5d814 100644
--- a/test/std/numerics/complex.number/cmplx.over/UDT_is_rejected.fail.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/UDT_is_rejected.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ UDT<long double> ldt;
 UDT<int> it;
 UDT<unsigned long> uit;
 
-int main()
+int main(int, char**)
 {
     {
         std::real(ft); // expected-error {{no matching function}}
@@ -71,4 +70,6 @@ int main()
         std::proj(it); // expected-error {{no matching function}}
         std::proj(uit); // expected-error {{no matching function}}
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/arg.pass.cpp b/test/std/numerics/complex.number/cmplx.over/arg.pass.cpp
index c649157a8..bbc865a5a 100644
--- a/test/std/numerics/complex.number/cmplx.over/arg.pass.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/arg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test()
     test<T>(10);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
@@ -52,4 +51,6 @@ int main()
     test<int>();
     test<unsigned>();
     test<long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/conj.pass.cpp b/test/std/numerics/complex.number/cmplx.over/conj.pass.cpp
index 6adbf21ec..46bf69aad 100644
--- a/test/std/numerics/complex.number/cmplx.over/conj.pass.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/conj.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ test()
     test<T>(10);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
@@ -63,4 +62,6 @@ int main()
     test<int>();
     test<unsigned>();
     test<long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/imag.pass.cpp b/test/std/numerics/complex.number/cmplx.over/imag.pass.cpp
index b5cffe9c1..a05781273 100644
--- a/test/std/numerics/complex.number/cmplx.over/imag.pass.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/imag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ test()
     test<T, 10>();
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
@@ -65,4 +64,6 @@ int main()
     test<int>();
     test<unsigned>();
     test<long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/norm.pass.cpp b/test/std/numerics/complex.number/cmplx.over/norm.pass.cpp
index e847a9413..69a2eada8 100644
--- a/test/std/numerics/complex.number/cmplx.over/norm.pass.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/norm.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test()
     test<T>(10);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
@@ -52,4 +51,6 @@ int main()
     test<int>();
     test<unsigned>();
     test<long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/pow.pass.cpp b/test/std/numerics/complex.number/cmplx.over/pow.pass.cpp
index 3b1e9b34b..802b9e773 100644
--- a/test/std/numerics/complex.number/cmplx.over/pow.pass.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/pow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -79,7 +78,7 @@ test(typename std::enable_if<!std::is_integral<T>::value>::type* = 0, typename s
     test(std::complex<T>(3, 4), std::complex<U>(5, 6));
 }
 
-int main()
+int main(int, char**)
 {
     test<int, float>();
     test<int, double>();
@@ -101,4 +100,6 @@ int main()
 
     test<long double, float>();
     test<long double, double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/proj.pass.cpp b/test/std/numerics/complex.number/cmplx.over/proj.pass.cpp
index 60d6e7223..41b82b0d7 100644
--- a/test/std/numerics/complex.number/cmplx.over/proj.pass.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/proj.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ test()
     test<T>(10);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
@@ -63,4 +62,6 @@ int main()
     test<int>();
     test<unsigned>();
     test<long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/cmplx.over/real.pass.cpp b/test/std/numerics/complex.number/cmplx.over/real.pass.cpp
index 07ae3ab7a..41e9c8fe2 100644
--- a/test/std/numerics/complex.number/cmplx.over/real.pass.cpp
+++ b/test/std/numerics/complex.number/cmplx.over/real.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ test()
     test<T, 10>();
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
@@ -65,4 +64,6 @@ int main()
     test<int>();
     test<unsigned>();
     test<long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.literals/literals.pass.cpp b/test/std/numerics/complex.number/complex.literals/literals.pass.cpp
index 8831ca1d6..7d8d701fd 100644
--- a/test/std/numerics/complex.number/complex.literals/literals.pass.cpp
+++ b/test/std/numerics/complex.number/complex.literals/literals.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals::complex_literals;
 
@@ -48,4 +47,6 @@ int main()
     auto c2 = 3if;
     assert ( c1 == c2 );
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.literals/literals1.fail.cpp b/test/std/numerics/complex.number/complex.literals/literals1.fail.cpp
index 6cc911d4e..c5e6b2910 100644
--- a/test/std/numerics/complex.number/complex.literals/literals1.fail.cpp
+++ b/test/std/numerics/complex.number/complex.literals/literals1.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,9 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::complex<float> foo  = 1.0if;  // should fail w/conversion operator not found
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.literals/literals1.pass.cpp b/test/std/numerics/complex.number/complex.literals/literals1.pass.cpp
index 09a6f270f..ba9532a5e 100644
--- a/test/std/numerics/complex.number/complex.literals/literals1.pass.cpp
+++ b/test/std/numerics/complex.number/complex.literals/literals1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals;
 
@@ -38,4 +37,6 @@ int main()
     auto c2 = 3if;
     assert ( c1 == c2 );
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.literals/literals2.pass.cpp b/test/std/numerics/complex.number/complex.literals/literals2.pass.cpp
index d11530d78..0b8d2f9cb 100644
--- a/test/std/numerics/complex.number/complex.literals/literals2.pass.cpp
+++ b/test/std/numerics/complex.number/complex.literals/literals2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std;
 
@@ -38,4 +37,6 @@ int main()
     auto c2 = 3if;
     assert ( c1 == c2 );
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/assignment_complex.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/assignment_complex.pass.cpp
index d39429427..d0ccb14f1 100644
--- a/test/std/numerics/complex.number/complex.member.ops/assignment_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/assignment_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test()
     assert(c.imag() == -4.5);
 }
 
-int main()
+int main(int, char**)
 {
     test<float, float>();
     test<float, double>();
@@ -45,4 +44,6 @@ int main()
     test<long double, float>();
     test<long double, double>();
     test<long double, long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/assignment_scalar.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/assignment_scalar.pass.cpp
index 87b78061e..faab37ea4 100644
--- a/test/std/numerics/complex.number/complex.member.ops/assignment_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/assignment_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,9 +28,11 @@ test()
     assert(c.imag() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/divide_equal_complex.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/divide_equal_complex.pass.cpp
index b4200fc81..052c2dcee 100644
--- a/test/std/numerics/complex.number/complex.member.ops/divide_equal_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/divide_equal_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,9 +44,11 @@ test()
 
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/divide_equal_scalar.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/divide_equal_scalar.pass.cpp
index 89907d13a..63d34b051 100644
--- a/test/std/numerics/complex.number/complex.member.ops/divide_equal_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/divide_equal_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,9 +35,11 @@ test()
     assert(c.imag() == 4);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/minus_equal_complex.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/minus_equal_complex.pass.cpp
index 67a1c7189..09cde6124 100644
--- a/test/std/numerics/complex.number/complex.member.ops/minus_equal_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/minus_equal_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,9 +43,11 @@ test()
     assert(c3.imag() == -6);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/minus_equal_scalar.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/minus_equal_scalar.pass.cpp
index ddec891b2..ae5b07157 100644
--- a/test/std/numerics/complex.number/complex.member.ops/minus_equal_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/minus_equal_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,9 +31,11 @@ test()
     assert(c.imag() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/plus_equal_complex.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/plus_equal_complex.pass.cpp
index 9b222b8a1..0c86b6750 100644
--- a/test/std/numerics/complex.number/complex.member.ops/plus_equal_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/plus_equal_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,9 +43,11 @@ test()
     assert(c3.imag() == 6);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/plus_equal_scalar.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/plus_equal_scalar.pass.cpp
index 4dd8066d1..498724a36 100644
--- a/test/std/numerics/complex.number/complex.member.ops/plus_equal_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/plus_equal_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,9 +31,11 @@ test()
     assert(c.imag() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/times_equal_complex.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/times_equal_complex.pass.cpp
index 98b7197cb..fc690072b 100644
--- a/test/std/numerics/complex.number/complex.member.ops/times_equal_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/times_equal_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,9 +43,11 @@ test()
     assert(c3.imag() ==   3.5);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.member.ops/times_equal_scalar.pass.cpp b/test/std/numerics/complex.number/complex.member.ops/times_equal_scalar.pass.cpp
index c94baa9b6..6cb95ea66 100644
--- a/test/std/numerics/complex.number/complex.member.ops/times_equal_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.member.ops/times_equal_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,9 +35,11 @@ test()
     assert(c.imag() == 3);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.members/construct.pass.cpp b/test/std/numerics/complex.number/complex.members/construct.pass.cpp
index 25b9ce62c..fa5e5729f 100644
--- a/test/std/numerics/complex.number/complex.members/construct.pass.cpp
+++ b/test/std/numerics/complex.number/complex.members/construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,9 +63,11 @@ test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.members/real_imag.pass.cpp b/test/std/numerics/complex.number/complex.members/real_imag.pass.cpp
index 8d55fcdb4..c4a1ef935 100644
--- a/test/std/numerics/complex.number/complex.members/real_imag.pass.cpp
+++ b/test/std/numerics/complex.number/complex.members/real_imag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,10 +56,12 @@ test()
     test_constexpr<T> ();
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_constexpr<int> ();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_divide_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_divide_complex.pass.cpp
index 8d4712eec..5166fa57f 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_divide_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_divide_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -150,10 +149,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_divide_scalar.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_divide_scalar.pass.cpp
index b23b381cb..e7a1d81cf 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_divide_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_divide_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,9 +32,11 @@ test()
     test(lhs, rhs, x);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_equals_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_equals_complex.pass.cpp
index 59243c7c6..27621f165 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_equals_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_equals_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,10 +52,12 @@ test()
     test_constexpr<T> ();
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
 //    test_constexpr<int> ();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_equals_scalar.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_equals_scalar.pass.cpp
index cd6972b9d..1ec74e703 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_equals_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_equals_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,10 +73,12 @@ test()
     test_constexpr<T> ();
     }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
 //     test_constexpr<int> ();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_minus_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_minus_complex.pass.cpp
index b2cddd26d..999a2c91d 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_minus_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_minus_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_minus_scalar.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_minus_scalar.pass.cpp
index b630679fc..9aea6819c 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_minus_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_minus_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_not_equals_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_not_equals_complex.pass.cpp
index 9c8ffe0b0..319e453a9 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_not_equals_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_not_equals_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,10 +54,12 @@ test()
     test_constexpr<T> ();
     }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
 //   test_constexpr<int> ();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_not_equals_scalar.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_not_equals_scalar.pass.cpp
index deb26e2d9..69c71cde0 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_not_equals_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_not_equals_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,10 +73,12 @@ test()
     test_constexpr<T> ();
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
 //     test_constexpr<int> ();
-    }
+    
+  return 0;
+}
diff --git a/test/std/numerics/complex.number/complex.ops/complex_plus_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_plus_complex.pass.cpp
index 02ed8684e..5a2fdcfb0 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_plus_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_plus_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_plus_scalar.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_plus_scalar.pass.cpp
index eeec83fb0..4f9dfb1d4 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_plus_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_plus_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_times_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_times_complex.pass.cpp
index 8ead5bfb6..f2203d4db 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_times_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_times_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -152,10 +151,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/complex_times_scalar.pass.cpp b/test/std/numerics/complex.number/complex.ops/complex_times_scalar.pass.cpp
index 0e829a4ca..9fface6b7 100644
--- a/test/std/numerics/complex.number/complex.ops/complex_times_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/complex_times_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,9 +32,11 @@ test()
     test(lhs, rhs, x);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/scalar_divide_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/scalar_divide_complex.pass.cpp
index e16f02ea6..01b706dd7 100644
--- a/test/std/numerics/complex.number/complex.ops/scalar_divide_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/scalar_divide_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,9 +32,11 @@ test()
     test(lhs, rhs, x);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/scalar_equals_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/scalar_equals_complex.pass.cpp
index 777d7d614..d5dcc2918 100644
--- a/test/std/numerics/complex.number/complex.ops/scalar_equals_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/scalar_equals_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,10 +73,12 @@ test()
     test_constexpr<T> ();
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
 //     test_constexpr<int>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/scalar_minus_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/scalar_minus_complex.pass.cpp
index 35a374911..006572492 100644
--- a/test/std/numerics/complex.number/complex.ops/scalar_minus_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/scalar_minus_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/scalar_not_equals_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/scalar_not_equals_complex.pass.cpp
index 6bfffb849..edff47a01 100644
--- a/test/std/numerics/complex.number/complex.ops/scalar_not_equals_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/scalar_not_equals_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,10 +73,12 @@ test()
     test_constexpr<T> ();
     }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
 //     test_constexpr<int>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/scalar_plus_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/scalar_plus_complex.pass.cpp
index ec0de5a7f..d8fc8a6d9 100644
--- a/test/std/numerics/complex.number/complex.ops/scalar_plus_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/scalar_plus_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,9 +40,11 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/scalar_times_complex.pass.cpp b/test/std/numerics/complex.number/complex.ops/scalar_times_complex.pass.cpp
index ebff8b23b..a33347db0 100644
--- a/test/std/numerics/complex.number/complex.ops/scalar_times_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/scalar_times_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,9 +32,11 @@ test()
     test(lhs, rhs, x);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/stream_input.pass.cpp b/test/std/numerics/complex.number/complex.ops/stream_input.pass.cpp
index 24644e307..4f33b97eb 100644
--- a/test/std/numerics/complex.number/complex.ops/stream_input.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/stream_input.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream is("5");
@@ -96,4 +95,6 @@ int main()
         assert(c == std::complex<double>(-5.5, -6.5));
         assert(!is.eof());
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/stream_output.pass.cpp b/test/std/numerics/complex.number/complex.ops/stream_output.pass.cpp
index edb381cf6..2f1fa91e8 100644
--- a/test/std/numerics/complex.number/complex.ops/stream_output.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/stream_output.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::complex<double> c(1, 2);
     std::ostringstream os;
     os << c;
     assert(os.str() == "(1,2)");
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/unary_minus.pass.cpp b/test/std/numerics/complex.number/complex.ops/unary_minus.pass.cpp
index 6a3a201ce..0249240e8 100644
--- a/test/std/numerics/complex.number/complex.ops/unary_minus.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/unary_minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,9 +27,11 @@ test()
     assert(c.imag() == -2.5);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.ops/unary_plus.pass.cpp b/test/std/numerics/complex.number/complex.ops/unary_plus.pass.cpp
index 5edaad29e..c5c2b6de1 100644
--- a/test/std/numerics/complex.number/complex.ops/unary_plus.pass.cpp
+++ b/test/std/numerics/complex.number/complex.ops/unary_plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,9 +27,11 @@ test()
     assert(c.imag() == 2.5);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/double_float_explicit.pass.cpp b/test/std/numerics/complex.number/complex.special/double_float_explicit.pass.cpp
index ac26e3c9e..f2e64466f 100644
--- a/test/std/numerics/complex.number/complex.special/double_float_explicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/double_float_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<float> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/double_float_implicit.pass.cpp b/test/std/numerics/complex.number/complex.special/double_float_implicit.pass.cpp
index 3bb01ac46..72a4f0241 100644
--- a/test/std/numerics/complex.number/complex.special/double_float_implicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/double_float_implicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<float> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/double_long_double_explicit.pass.cpp b/test/std/numerics/complex.number/complex.special/double_long_double_explicit.pass.cpp
index 97c258024..751b3b851 100644
--- a/test/std/numerics/complex.number/complex.special/double_long_double_explicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/double_long_double_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<long double> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/double_long_double_implicit.fail.cpp b/test/std/numerics/complex.number/complex.special/double_long_double_implicit.fail.cpp
index 3866f6e33..51242310a 100644
--- a/test/std/numerics/complex.number/complex.special/double_long_double_implicit.fail.cpp
+++ b/test/std/numerics/complex.number/complex.special/double_long_double_implicit.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 #include <complex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::complex<long double> cd(2.5, 3.5);
     std::complex<double> cf = cd;
     assert(cf.real() == cd.real());
     assert(cf.imag() == cd.imag());
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/float_double_explicit.pass.cpp b/test/std/numerics/complex.number/complex.special/float_double_explicit.pass.cpp
index 3027d4cdc..7ed53c62d 100644
--- a/test/std/numerics/complex.number/complex.special/float_double_explicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/float_double_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<double> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/float_double_implicit.fail.cpp b/test/std/numerics/complex.number/complex.special/float_double_implicit.fail.cpp
index d15197532..7274a2121 100644
--- a/test/std/numerics/complex.number/complex.special/float_double_implicit.fail.cpp
+++ b/test/std/numerics/complex.number/complex.special/float_double_implicit.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 #include <complex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::complex<double> cd(2.5, 3.5);
     std::complex<float> cf = cd;
     assert(cf.real() == cd.real());
     assert(cf.imag() == cd.imag());
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/float_long_double_explicit.pass.cpp b/test/std/numerics/complex.number/complex.special/float_long_double_explicit.pass.cpp
index 515e83dfc..b191bf6ea 100644
--- a/test/std/numerics/complex.number/complex.special/float_long_double_explicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/float_long_double_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<long double> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/float_long_double_implicit.fail.cpp b/test/std/numerics/complex.number/complex.special/float_long_double_implicit.fail.cpp
index 9401febee..3bf7a0376 100644
--- a/test/std/numerics/complex.number/complex.special/float_long_double_implicit.fail.cpp
+++ b/test/std/numerics/complex.number/complex.special/float_long_double_implicit.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 #include <complex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::complex<long double> cd(2.5, 3.5);
     std::complex<float> cf = cd;
     assert(cf.real() == cd.real());
     assert(cf.imag() == cd.imag());
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/long_double_double_explicit.pass.cpp b/test/std/numerics/complex.number/complex.special/long_double_double_explicit.pass.cpp
index 4f24a1c65..e257db2bd 100644
--- a/test/std/numerics/complex.number/complex.special/long_double_double_explicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/long_double_double_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<double> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/long_double_double_implicit.pass.cpp b/test/std/numerics/complex.number/complex.special/long_double_double_implicit.pass.cpp
index 8cbd7a8a1..b47d945fe 100644
--- a/test/std/numerics/complex.number/complex.special/long_double_double_implicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/long_double_double_implicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<double> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/long_double_float_explicit.pass.cpp b/test/std/numerics/complex.number/complex.special/long_double_float_explicit.pass.cpp
index 7930548f9..97f91ee07 100644
--- a/test/std/numerics/complex.number/complex.special/long_double_float_explicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/long_double_float_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<float> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.special/long_double_float_implicit.pass.cpp b/test/std/numerics/complex.number/complex.special/long_double_float_implicit.pass.cpp
index 22b9fd08a..51e966d4c 100644
--- a/test/std/numerics/complex.number/complex.special/long_double_float_implicit.pass.cpp
+++ b/test/std/numerics/complex.number/complex.special/long_double_float_implicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::complex<float> cd(2.5, 3.5);
@@ -36,4 +35,6 @@ int main()
     static_assert(cf.imag() == cd.imag(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.synopsis/nothing_to_do.pass.cpp b/test/std/numerics/complex.number/complex.synopsis/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/complex.number/complex.synopsis/nothing_to_do.pass.cpp
+++ b/test/std/numerics/complex.number/complex.synopsis/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/acos.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/acos.pass.cpp
index 837734fcd..ecb669689 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/acos.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/acos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -130,10 +129,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/acosh.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/acosh.pass.cpp
index 5258bdc3a..4a22dde02 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/acosh.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/acosh.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,10 +140,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/asin.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/asin.pass.cpp
index 8d7462141..91ec6e9bd 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/asin.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/asin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -109,10 +108,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/asinh.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/asinh.pass.cpp
index cb9188d93..18ac1f17a 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/asinh.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/asinh.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -118,10 +117,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/atan.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/atan.pass.cpp
index 9e2298cf7..1816e2f99 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/atan.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/atan.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,10 +57,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/atanh.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/atanh.pass.cpp
index 37e00c392..5e4bb13f5 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/atanh.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/atanh.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -122,10 +121,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/cos.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/cos.pass.cpp
index be9d505b9..2085a4c85 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/cos.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/cos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,10 +56,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/cosh.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/cosh.pass.cpp
index dad5bd190..e95c2968d 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/cosh.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/cosh.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -107,10 +106,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/exp.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/exp.pass.cpp
index 31317816f..fc638d135 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/exp.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/exp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -105,10 +104,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/log.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/log.pass.cpp
index 589b59699..35f0c5c41 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/log.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/log.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -122,10 +121,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/log10.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/log10.pass.cpp
index 8eb72006a..676175507 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/log10.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/log10.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,10 +55,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/pow_complex_complex.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/pow_complex_complex.pass.cpp
index 0d039a159..d34ab0c7c 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/pow_complex_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/pow_complex_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,10 +60,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/pow_complex_scalar.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/pow_complex_scalar.pass.cpp
index 36a296221..7ffdd6136 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/pow_complex_scalar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/pow_complex_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,10 +58,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/pow_scalar_complex.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/pow_scalar_complex.pass.cpp
index 74a3857e9..e4b5d3d14 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/pow_scalar_complex.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/pow_scalar_complex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,10 +58,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/sin.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/sin.pass.cpp
index 0ab8ac275..6e33f7054 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/sin.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/sin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,10 +57,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/sinh.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/sinh.pass.cpp
index e310f26dc..7a9e79898 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/sinh.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/sinh.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -108,10 +107,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/sqrt.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/sqrt.pass.cpp
index d3273179a..a0b843302 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/sqrt.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/sqrt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -100,10 +99,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/tan.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/tan.pass.cpp
index f27ead3da..b4bc207fc 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/tan.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/tan.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,10 +58,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.transcendentals/tanh.pass.cpp b/test/std/numerics/complex.number/complex.transcendentals/tanh.pass.cpp
index 1028836f9..1be3a2cd0 100644
--- a/test/std/numerics/complex.number/complex.transcendentals/tanh.pass.cpp
+++ b/test/std/numerics/complex.number/complex.transcendentals/tanh.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -90,10 +89,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/abs.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/abs.pass.cpp
index 7a0e3bd70..7a518fc37 100644
--- a/test/std/numerics/complex.number/complex.value.ops/abs.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/abs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,10 +53,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/arg.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/arg.pass.cpp
index 78f2781b7..280ccc8cb 100644
--- a/test/std/numerics/complex.number/complex.value.ops/arg.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/arg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -126,10 +125,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/conj.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/conj.pass.cpp
index 71f276d8d..8c144ffbf 100644
--- a/test/std/numerics/complex.number/complex.value.ops/conj.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/conj.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,9 +32,11 @@ test()
     test(std::complex<T>(-1, -2), std::complex<T>(-1, 2));
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/imag.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/imag.pass.cpp
index fa7b7339a..fe7cb3a96 100644
--- a/test/std/numerics/complex.number/complex.value.ops/imag.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/imag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,9 +23,11 @@ test()
     assert(imag(z) == 2.5);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/norm.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/norm.pass.cpp
index da7ad14be..fe197ff21 100644
--- a/test/std/numerics/complex.number/complex.value.ops/norm.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/norm.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,10 +53,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp
index 69463ded2..b7450abed 100644
--- a/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/polar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -103,10 +102,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp
index 1a7e0c53f..238429b55 100644
--- a/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/proj.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,10 +61,12 @@ void test_edges()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
     test_edges();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex.value.ops/real.pass.cpp b/test/std/numerics/complex.number/complex.value.ops/real.pass.cpp
index fbb51f080..138785900 100644
--- a/test/std/numerics/complex.number/complex.value.ops/real.pass.cpp
+++ b/test/std/numerics/complex.number/complex.value.ops/real.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,9 +23,11 @@ test()
     assert(real(z) == 1.5);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/complex/types.pass.cpp b/test/std/numerics/complex.number/complex/types.pass.cpp
index 4da9a2a90..517743071 100644
--- a/test/std/numerics/complex.number/complex/types.pass.cpp
+++ b/test/std/numerics/complex.number/complex/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,9 +27,11 @@ test()
     static_assert((std::is_same<typename C::value_type, T>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/complex.number/layout.pass.cpp b/test/std/numerics/complex.number/layout.pass.cpp
index a9f356d4a..bcb81189a 100644
--- a/test/std/numerics/complex.number/layout.pass.cpp
+++ b/test/std/numerics/complex.number/layout.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,9 +27,11 @@ test()
     assert(a[1] == z.imag());
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/numerics/nothing_to_do.pass.cpp b/test/std/numerics/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/nothing_to_do.pass.cpp
+++ b/test/std/numerics/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.gslice/gslice.access/tested_elsewhere.pass.cpp b/test/std/numerics/numarray/class.gslice/gslice.access/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numarray/class.gslice/gslice.access/tested_elsewhere.pass.cpp
+++ b/test/std/numerics/numarray/class.gslice/gslice.access/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.gslice/gslice.cons/default.pass.cpp b/test/std/numerics/numarray/class.gslice/gslice.cons/default.pass.cpp
index 29cc34f07..312425afb 100644
--- a/test/std/numerics/numarray/class.gslice/gslice.cons/default.pass.cpp
+++ b/test/std/numerics/numarray/class.gslice/gslice.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::gslice gs;
     assert(gs.start() == 0);
     assert(gs.size().size() == 0);
     assert(gs.stride().size() == 0);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.gslice/gslice.cons/start_size_stride.pass.cpp b/test/std/numerics/numarray/class.gslice/gslice.cons/start_size_stride.pass.cpp
index 931c0d3c7..682bb83fd 100644
--- a/test/std/numerics/numarray/class.gslice/gslice.cons/start_size_stride.pass.cpp
+++ b/test/std/numerics/numarray/class.gslice/gslice.cons/start_size_stride.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::size_t a1[] = {1, 2, 3};
     std::size_t a2[] = {4, 5, 6};
@@ -35,4 +34,6 @@ int main()
     assert(r[0] == 4);
     assert(r[1] == 5);
     assert(r[2] == 6);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.gslice/nothing_to_do.pass.cpp b/test/std/numerics/numarray/class.gslice/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numarray/class.gslice/nothing_to_do.pass.cpp
+++ b/test/std/numerics/numarray/class.gslice/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.slice/cons.slice/default.pass.cpp b/test/std/numerics/numarray/class.slice/cons.slice/default.pass.cpp
index d0a6cc0d2..92c17b8a2 100644
--- a/test/std/numerics/numarray/class.slice/cons.slice/default.pass.cpp
+++ b/test/std/numerics/numarray/class.slice/cons.slice/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::slice s;
     assert(s.start() == 0);
     assert(s.size() == 0);
     assert(s.stride() == 0);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.slice/cons.slice/start_size_stride.pass.cpp b/test/std/numerics/numarray/class.slice/cons.slice/start_size_stride.pass.cpp
index 84f7ed6a1..72bff9757 100644
--- a/test/std/numerics/numarray/class.slice/cons.slice/start_size_stride.pass.cpp
+++ b/test/std/numerics/numarray/class.slice/cons.slice/start_size_stride.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::slice s(1, 3, 2);
     assert(s.start() == 1);
     assert(s.size() == 3);
     assert(s.stride() == 2);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.slice/nothing_to_do.pass.cpp b/test/std/numerics/numarray/class.slice/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numarray/class.slice/nothing_to_do.pass.cpp
+++ b/test/std/numerics/numarray/class.slice/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/class.slice/slice.access/tested_elsewhere.pass.cpp b/test/std/numerics/numarray/class.slice/slice.access/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numarray/class.slice/slice.access/tested_elsewhere.pass.cpp
+++ b/test/std/numerics/numarray/class.slice/slice.access/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/default.fail.cpp b/test/std/numerics/numarray/template.gslice.array/default.fail.cpp
index d691cbe08..4429367cf 100644
--- a/test/std/numerics/numarray/template.gslice.array/default.fail.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/default.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::gslice_array<int> gs;
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/gslice_array.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/gslice_array.pass.cpp
index d26a7b36c..3a916257b 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/gslice_array.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/gslice_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -78,4 +77,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/valarray.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/valarray.pass.cpp
index 2f960c12d..e1aca3b7c 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.assign/valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/addition.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/addition.pass.cpp
index bd2ad7074..9c82a6f94 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/addition.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/addition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/and.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/and.pass.cpp
index 6875c5ea7..bfe8ab288 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/and.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/divide.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/divide.pass.cpp
index 33a00328f..ec54bc4bb 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/divide.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/divide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/modulo.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/modulo.pass.cpp
index addc43da0..63ad3a777 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/modulo.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/modulo.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/multiply.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/multiply.pass.cpp
index 37555fdfa..b22fd3015 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/multiply.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/multiply.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/or.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/or.pass.cpp
index 24e96e821..0b068935f 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/or.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_left.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_left.pass.cpp
index ddaf4f7ca..912e48aca 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_left.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_left.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_right.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_right.pass.cpp
index 4c06a29e5..2c8598f7b 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_right.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/shift_right.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/subtraction.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/subtraction.pass.cpp
index 3feda53ae..8b1271b04 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/subtraction.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/subtraction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/xor.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/xor.pass.cpp
index 125935169..9a981ece8 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/xor.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.comp.assign/xor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/gslice.array.fill/assign_value.pass.cpp b/test/std/numerics/numarray/template.gslice.array/gslice.array.fill/assign_value.pass.cpp
index 5c5591aa1..c7c092580 100644
--- a/test/std/numerics/numarray/template.gslice.array/gslice.array.fill/assign_value.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/gslice.array.fill/assign_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -71,4 +70,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.gslice.array/types.pass.cpp b/test/std/numerics/numarray/template.gslice.array/types.pass.cpp
index 005d907b4..9263c0e05 100644
--- a/test/std/numerics/numarray/template.gslice.array/types.pass.cpp
+++ b/test/std/numerics/numarray/template.gslice.array/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::gslice_array<int>::value_type, int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/default.fail.cpp b/test/std/numerics/numarray/template.indirect.array/default.fail.cpp
index 2f5e5d832..988cdad90 100644
--- a/test/std/numerics/numarray/template.indirect.array/default.fail.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/default.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::indirect_array<int> ia;
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/indirect_array.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/indirect_array.pass.cpp
index 9c7c816ce..c19152bb9 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/indirect_array.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/indirect_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -77,4 +76,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/valarray.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/valarray.pass.cpp
index ad934aabc..0bc4b5817 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.assign/valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/addition.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/addition.pass.cpp
index fa966d1b5..3ed95f9cb 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/addition.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/addition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/and.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/and.pass.cpp
index 60f055276..00fd2f18d 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/and.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/divide.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/divide.pass.cpp
index 11b5d83fe..1a9ca265a 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/divide.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/divide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/modulo.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/modulo.pass.cpp
index 4c63684ec..bad0b950e 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/modulo.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/modulo.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/multiply.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/multiply.pass.cpp
index e47735310..7e78f0a8f 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/multiply.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/multiply.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/or.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/or.pass.cpp
index b74ce8621..ba32accc6 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/or.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_left.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_left.pass.cpp
index e23f14299..deff80cc3 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_left.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_left.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_right.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_right.pass.cpp
index 33db33f0c..d2ac73954 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_right.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/shift_right.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/subtraction.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/subtraction.pass.cpp
index dd2d35f99..d94422c09 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/subtraction.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/subtraction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/xor.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/xor.pass.cpp
index f2c3427b9..06e066827 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/xor.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.comp.assign/xor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/indirect.array.fill/assign_value.pass.cpp b/test/std/numerics/numarray/template.indirect.array/indirect.array.fill/assign_value.pass.cpp
index de2bb4344..e327d2630 100644
--- a/test/std/numerics/numarray/template.indirect.array/indirect.array.fill/assign_value.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/indirect.array.fill/assign_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -71,4 +70,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.indirect.array/types.pass.cpp b/test/std/numerics/numarray/template.indirect.array/types.pass.cpp
index fe118ea32..5d06c5baf 100644
--- a/test/std/numerics/numarray/template.indirect.array/types.pass.cpp
+++ b/test/std/numerics/numarray/template.indirect.array/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::indirect_array<int>::value_type, int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/default.fail.cpp b/test/std/numerics/numarray/template.mask.array/default.fail.cpp
index 97476c65c..f22298bf9 100644
--- a/test/std/numerics/numarray/template.mask.array/default.fail.cpp
+++ b/test/std/numerics/numarray/template.mask.array/default.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::mask_array<int> s;
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp
index 29cb787d0..22ce22ad6 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
@@ -63,4 +62,6 @@ int main()
     std::mask_array<int> const & r = (m1 = m2);
     assert(&r == &m1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.assign/valarray.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.assign/valarray.pass.cpp
index 63949e244..e364c442f 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.assign/valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.assign/valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/addition.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/addition.pass.cpp
index 984762943..e8f0958b5 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/addition.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/addition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/and.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/and.pass.cpp
index 7e110b13a..ab2937986 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/and.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/divide.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/divide.pass.cpp
index 9fe243875..cd67632ef 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/divide.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/divide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/modulo.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/modulo.pass.cpp
index bd0ee0836..7cf8b585d 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/modulo.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/modulo.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/multiply.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/multiply.pass.cpp
index 13efefc37..537bf40d8 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/multiply.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/multiply.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/or.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/or.pass.cpp
index 9b06879a8..d0297b831 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/or.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_left.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_left.pass.cpp
index 9c1f92a3e..eee4c1d46 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_left.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_left.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_right.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_right.pass.cpp
index 438d3427d..b65c19f99 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_right.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_right.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/subtraction.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/subtraction.pass.cpp
index 16e387dc6..40fddd123 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/subtraction.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/subtraction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/xor.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/xor.pass.cpp
index ae3c2383d..a04b6da27 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/xor.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/xor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -46,4 +45,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.fill/assign_value.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.fill/assign_value.pass.cpp
index c37916b0b..bb4fd8591 100644
--- a/test/std/numerics/numarray/template.mask.array/mask.array.fill/assign_value.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.fill/assign_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -42,4 +41,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.mask.array/types.pass.cpp b/test/std/numerics/numarray/template.mask.array/types.pass.cpp
index c984c3fea..1d4acea6f 100644
--- a/test/std/numerics/numarray/template.mask.array/types.pass.cpp
+++ b/test/std/numerics/numarray/template.mask.array/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::mask_array<int>::value_type, int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/default.fail.cpp b/test/std/numerics/numarray/template.slice.array/default.fail.cpp
index 3b522f0e1..90b1845ba 100644
--- a/test/std/numerics/numarray/template.slice.array/default.fail.cpp
+++ b/test/std/numerics/numarray/template.slice.array/default.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::slice_array<int> s;
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.assign/slice_array.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.assign/slice_array.pass.cpp
index 60b94ab5f..9683c7dfb 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.assign/slice_array.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.assign/slice_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
@@ -51,4 +50,6 @@ int main()
     std::slice_array<int> const & s3 = (s1 = s2);
     assert(&s1 == &s3);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.assign/valarray.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.assign/valarray.pass.cpp
index d3857863f..88a5b44ab 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.assign/valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.assign/valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {-1, -2, -3, -4, -5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] == -5);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/addition.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/addition.pass.cpp
index 8b5bf75d4..0433877e7 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/addition.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/addition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {-1, -2, -3, -4, -5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] ==  8);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/and.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/and.pass.cpp
index dbcae8477..90bbe4ef3 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/and.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {1, 2, 3, 4, 5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] ==  5);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/divide.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/divide.pass.cpp
index 71785015b..ae1383b84 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/divide.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/divide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {-1, -2, -3, -4, -5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] == -2);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/modulo.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/modulo.pass.cpp
index e08fb51a8..89c1acfb3 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/modulo.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/modulo.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {-1, -2, -3, -4, -5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] ==  3);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/multiply.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/multiply.pass.cpp
index 257c03164..b7c6b1353 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/multiply.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/multiply.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {-1, -2, -3, -4, -5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] == -65);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/or.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/or.pass.cpp
index 0826708a3..0f37579e8 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/or.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {1, 2, 3, 4, 5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_left.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_left.pass.cpp
index 84360d8c9..547a8cd27 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_left.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_left.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {1, 2, 3, 4, 5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] == 416);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_right.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_right.pass.cpp
index c39cd53e9..99c4ef943 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_right.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/shift_right.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {1, 2, 3, 4, 5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] ==  0);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/subtraction.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/subtraction.pass.cpp
index e6419fb2c..db513bc96 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/subtraction.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/subtraction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {-1, -2, -3, -4, -5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] == 18);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/xor.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/xor.pass.cpp
index 294106ed7..4ecba4723 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/xor.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.comp.assign/xor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {1, 2, 3, 4, 5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] ==  8);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/slice.arr.fill/assign_value.pass.cpp b/test/std/numerics/numarray/template.slice.array/slice.arr.fill/assign_value.pass.cpp
index 4f7af4baf..ab2156b46 100644
--- a/test/std/numerics/numarray/template.slice.array/slice.arr.fill/assign_value.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/slice.arr.fill/assign_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
@@ -38,4 +37,6 @@ int main()
     assert(v1[13] == 20);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.slice.array/types.pass.cpp b/test/std/numerics/numarray/template.slice.array/types.pass.cpp
index 8c40b154f..fccde7edb 100644
--- a/test/std/numerics/numarray/template.slice.array/types.pass.cpp
+++ b/test/std/numerics/numarray/template.slice.array/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::slice_array<int>::value_type, int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/types.pass.cpp b/test/std/numerics/numarray/template.valarray/types.pass.cpp
index 71421e543..f37ba0f77 100644
--- a/test/std/numerics/numarray/template.valarray/types.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 #include <valarray>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::valarray<int>::value_type, int>::value), "");
     static_assert((std::is_same<std::valarray<double>::value_type, double>::value), "");
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.access/access.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.access/access.pass.cpp
index 2e3b83ec7..d92154130 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.access/access.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.access/access.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
             assert(v[i] == static_cast<int>(i));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.access/const_access.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.access/const_access.pass.cpp
index 8d5630516..a0174ccb3 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.access/const_access.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.access/const_access.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -28,4 +27,6 @@ int main()
             assert(v[i] == a[i]);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/copy_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/copy_assign.pass.cpp
index da1225ae0..777d922a4 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/copy_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool operator==(const S& lhs, const S& rhs)
     return lhs.x_ == rhs.x_;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -83,4 +82,6 @@ int main()
             assert(v2[i] == v[i]);
         assert(!S::default_ctor_called);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/gslice_array_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/gslice_array_assign.pass.cpp
index dff523f19..df5ae9162 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/gslice_array_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/gslice_array_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -55,4 +54,6 @@ int main()
     assert(v[21] == 34);
     assert(v[22] == 35);
     assert(v[23] == 36);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/indirect_array_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/indirect_array_assign.pass.cpp
index 6e8069cc2..f8b5243b9 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/indirect_array_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/indirect_array_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -55,4 +54,6 @@ int main()
     assert(v[21] == 34);
     assert(v[22] == 35);
     assert(v[23] == 36);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/initializer_list_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/initializer_list_assign.pass.cpp
index 7923b104b..1f9e5a51f 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/initializer_list_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/initializer_list_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ bool operator==(const S& lhs, const S& rhs)
     return lhs.x_ == rhs.x_;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -81,4 +80,6 @@ int main()
             assert(v2[i] == a[i]);
         assert(!S::default_ctor_called);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/mask_array_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/mask_array_assign.pass.cpp
index a52c9d9d6..aeb95a10b 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/mask_array_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/mask_array_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -32,4 +31,6 @@ int main()
     assert(v2[ 2] ==  4);
     assert(v2[ 3] ==  7);
     assert(v2[ 4] == 11);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/move_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/move_assign.pass.cpp
index 19b74ba28..522c0a2a3 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/move_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -61,4 +60,6 @@ int main()
                 assert(v2[i][j] == a[i][j]);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/slice_array_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/slice_array_assign.pass.cpp
index 9a7517aa1..68b0e37d4 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/slice_array_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/slice_array_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     std::valarray<int> v1(a, sizeof(a)/sizeof(a[0]));
@@ -28,4 +27,6 @@ int main()
     assert(v[2] == 7);
     assert(v[3] == 10);
     assert(v[4] == 13);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.assign/value_assign.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.assign/value_assign.pass.cpp
index cf1d34a11..3adb1465c 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.assign/value_assign.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.assign/value_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -29,4 +28,6 @@ int main()
         for (std::size_t i = 0; i < v.size(); ++i)
             assert(v[i] == 7);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/and_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/and_valarray.pass.cpp
index 9ceae5f2d..60b307153 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/and_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/and_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/and_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/and_value.pass.cpp
index 2d74a3337..287372150 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/and_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/and_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_valarray.pass.cpp
index 914e632d5..fdb9975d5 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_value.pass.cpp
index 58ea7f18b..a309767ff 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/divide_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_valarray.pass.cpp
index 2cc2cce56..a8ef9152b 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_value.pass.cpp
index 49d7c7f5b..263ac820a 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/minus_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_valarray.pass.cpp
index 3bbff9943..79cfeb0c4 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v2[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_value.pass.cpp
index d372d88a4..b0ea0a298 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/modulo_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/or_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/or_valarray.pass.cpp
index 4a1be1916..df962a044 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/or_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/or_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/or_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/or_value.pass.cpp
index bab99bca0..1be8942ab 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/or_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/or_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_valarray.pass.cpp
index 5f6047f65..3700e5c47 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_value.pass.cpp
index 0b5e88eda..c8c5d1ef9 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/plus_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_valarray.pass.cpp
index 962648118..f642ce431 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_value.pass.cpp
index 05fa3b94c..8cba6b4da 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_left_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_valarray.pass.cpp
index 7161d27e6..d50971b39 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_value.pass.cpp
index 726ac9b8f..670599afd 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/shift_right_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/times_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/times_valarray.pass.cpp
index 02c0cc59e..f7e3da5bf 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/times_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/times_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/times_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/times_value.pass.cpp
index 1740e449d..963279968 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/times_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/times_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_valarray.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_valarray.pass.cpp
index 452b581e0..bf0805511 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_valarray.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -34,4 +33,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_value.pass.cpp
index 6951653b4..0a3d3200f 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cassign/xor_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -31,4 +30,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == v2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/copy.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/copy.pass.cpp
index 6ebff7256..8a9c6baae 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/copy.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -53,4 +52,6 @@ int main()
                 assert(v2[i][j] == v[i][j]);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/default.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/default.pass.cpp
index 9933322de..b56039802 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/default.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ struct S {
 
 bool S::ctor_called = false;
 
-int main()
+int main(int, char**)
 {
     {
         std::valarray<int> v;
@@ -46,4 +45,6 @@ int main()
         assert(v.size() == 0);
         assert(!S::ctor_called);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/gslice_array.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/gslice_array.pass.cpp
index 56601dc92..fdab3e3e8 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/gslice_array.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/gslice_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -54,4 +53,6 @@ int main()
     assert(v[21] == 34);
     assert(v[22] == 35);
     assert(v[23] == 36);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/indirect_array.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/indirect_array.pass.cpp
index dbca1f9c7..3a62b0a54 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/indirect_array.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/indirect_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -54,4 +53,6 @@ int main()
     assert(v[21] == 34);
     assert(v[22] == 35);
     assert(v[23] == 36);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/initializer_list.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/initializer_list.pass.cpp
index ce385e65c..1f5986eda 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/initializer_list.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -38,4 +37,6 @@ int main()
         for (unsigned i = 0; i < N; ++i)
             assert(v[i] == a[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/mask_array.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/mask_array.pass.cpp
index be4f74039..4559c36e7 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/mask_array.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/mask_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -31,4 +30,6 @@ int main()
     assert(v2[ 2] ==  4);
     assert(v2[ 3] ==  7);
     assert(v2[ 4] == 11);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/move.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/move.pass.cpp
index b8fb08e0f..0ef6f3cee 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/move.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -59,4 +58,6 @@ int main()
                 assert(v2[i][j] == a[i][j]);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/pointer_size.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/pointer_size.pass.cpp
index f98230f47..a0b4a31ae 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/pointer_size.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -50,4 +49,6 @@ int main()
                 assert(v[i][j] == a[i][j]);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp
index 221187c4e..95417e58a 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct S {
 
 size_t S::cnt_dtor = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::valarray<int> v(100);
@@ -52,4 +51,6 @@ int main()
             assert(v[i].x == 1);
     }
     assert(S::cnt_dtor == 100);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/slice_array.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/slice_array.pass.cpp
index b67641414..332a61715 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/slice_array.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/slice_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     std::valarray<int> v1(a, sizeof(a)/sizeof(a[0]));
@@ -27,4 +26,6 @@ int main()
     assert(v[2] == 7);
     assert(v[3] == 10);
     assert(v[4] == 13);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.cons/value_size.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.cons/value_size.pass.cpp
index 336c898b5..03e4add46 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.cons/value_size.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.cons/value_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::valarray<int> v(5, 100);
@@ -36,4 +35,6 @@ int main()
         for (int i = 0; i < 100; ++i)
             assert(v[i].size() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/apply_cref.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/apply_cref.pass.cpp
index 919a3a5e4..65277870a 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/apply_cref.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/apply_cref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@ typedef int T;
 
 T f(const T& t) {return t + 5;}
 
-int main()
+int main(int, char**)
 {
     {
         T a1[] = {1, 2, 3, 4,  5,  6,  7,  8,  9, 10};
@@ -48,4 +47,6 @@ int main()
         for (unsigned i = 0; i < N1; ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/apply_value.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/apply_value.pass.cpp
index dc7a1a100..fd100b5e5 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/apply_value.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/apply_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@ typedef int T;
 
 T f(T t) {return t + 5;}
 
-int main()
+int main(int, char**)
 {
     {
         T a1[] = {1, 2, 3, 4,  5,  6,  7,  8,  9, 10};
@@ -48,4 +47,6 @@ int main()
         for (unsigned i = 0; i < N1; ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/cshift.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/cshift.pass.cpp
index 601a6df8d..14ca081a1 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/cshift.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/cshift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -124,4 +123,6 @@ int main()
         for (unsigned i = 0; i < N1; ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/max.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/max.pass.cpp
index 697d4cd19..bdd84c118 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/max.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -37,4 +36,6 @@ int main()
         std::valarray<T> v1(a1, N1);
         assert((2*v1).max() == 8.0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/min.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/min.pass.cpp
index dac593437..ca04a9308 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/min.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -37,4 +36,6 @@ int main()
         std::valarray<T> v1(a1, N1);
         assert((2*v1).min() == -6.0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/resize.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/resize.pass.cpp
index 9a527c250..e92e7420b 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/resize.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/resize.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -39,4 +38,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v1[i] == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/shift.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/shift.pass.cpp
index 9a617a91a..1a7628eb3 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/shift.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/shift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -124,4 +123,6 @@ int main()
         for (unsigned i = 0; i < N1; ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/size.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/size.pass.cpp
index 0aae5b8de..f79062723 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/size.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -38,4 +37,6 @@ int main()
         std::valarray<T> v1;
         assert(v1.size() == N1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/sum.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/sum.pass.cpp
index 189f03d25..084f00fb9 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/sum.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/sum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -25,4 +24,6 @@ int main()
         std::valarray<T> v1(a1, N1);
         assert(v1.sum() == 16.5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.members/swap.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.members/swap.pass.cpp
index b2b55fdc3..12a7d8fd8 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.members/swap.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.members/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -83,4 +82,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == v1_save[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_const.pass.cpp
index 7bbd48c34..d84309f22 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -74,4 +73,6 @@ int main()
     assert(v1[38] == 38);
     assert(v1[39] == 39);
     assert(v1[40] == 40);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_non_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_non_const.pass.cpp
index 282dcf1f6..ac6971878 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_non_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/gslice_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -54,4 +53,6 @@ int main()
     assert(v[21] == 34);
     assert(v[22] == 35);
     assert(v[23] == 36);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_const.pass.cpp
index 1bc4fb929..7e5ef1546 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -54,4 +53,6 @@ int main()
     assert(v[21] == 34);
     assert(v[22] == 35);
     assert(v[23] == 36);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_non_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_non_const.pass.cpp
index d0b743817..82a5f1448 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_non_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
@@ -55,4 +54,6 @@ int main()
     assert(v[21] == 34);
     assert(v[22] == 35);
     assert(v[23] == 36);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/slice_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/slice_const.pass.cpp
index 7f8191035..d689ce923 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/slice_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/slice_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
@@ -27,4 +26,6 @@ int main()
     assert(v2[2] ==  7);
     assert(v2[3] == 10);
     assert(v2[4] == 13);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/slice_non_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/slice_non_const.pass.cpp
index 6bf9b430e..a6c7cb7e8 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/slice_non_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/slice_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     int a2[] = {-1, -2, -3, -4, -5};
@@ -40,4 +39,6 @@ int main()
     assert(v1[13] == -5);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_const.pass.cpp
index 10bdd82e5..13cafbccb 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -31,4 +30,6 @@ int main()
     assert(v2[ 2] ==  4);
     assert(v2[ 3] ==  7);
     assert(v2[ 4] == 11);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_non_const.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_non_const.pass.cpp
index cecf95022..34b4cfdb5 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_non_const.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
@@ -32,4 +31,6 @@ int main()
     assert(v2[ 2] ==  4);
     assert(v2[ 3] ==  7);
     assert(v2[ 4] == 11);
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.unary/bit_not.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.unary/bit_not.pass.cpp
index 5b2501f7e..7f31355d0 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.unary/bit_not.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.unary/bit_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -53,4 +52,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == ~(2*v[i]));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.unary/negate.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.unary/negate.pass.cpp
index f4a83427c..a89b24d23 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.unary/negate.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.unary/negate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -63,4 +62,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == -2*v[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.unary/not.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.unary/not.pass.cpp
index 844b3d210..3975510fb 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.unary/not.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.unary/not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -39,4 +38,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == !(2 * v[i]));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/template.valarray/valarray.unary/plus.pass.cpp b/test/std/numerics/numarray/template.valarray/valarray.unary/plus.pass.cpp
index 8df049455..b1f7f313f 100644
--- a/test/std/numerics/numarray/template.valarray/valarray.unary/plus.pass.cpp
+++ b/test/std/numerics/numarray/template.valarray/valarray.unary/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -63,4 +62,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == +2*v[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/nothing_to_do.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/nothing_to_do.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_valarray.pass.cpp
index 724b86841..3be9074db 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_value.pass.cpp
index 360ffe5eb..4f1bf8ad6 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_value_valarray.pass.cpp
index 7de81179d..05990124e 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/and_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_valarray.pass.cpp
index cb02459cd..50c6a1484 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_value.pass.cpp
index 0b692aa35..f5e0b2727 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_value_valarray.pass.cpp
index c6c339b2a..dde6955bb 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/divide_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_valarray.pass.cpp
index ddea683ce..f1df168b3 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_value.pass.cpp
index b5fc58a9f..0ea4f0c1d 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_value_valarray.pass.cpp
index 1780eda20..f2131d10e 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/minus_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_valarray.pass.cpp
index 58b78a322..22d82f4b5 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_value.pass.cpp
index 083fdabd8..f498e7af5 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_value_valarray.pass.cpp
index 55801ca69..fbd407ce2 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/modulo_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_valarray.pass.cpp
index adea116c9..f305243d5 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_value.pass.cpp
index 3f526b8f6..90fa4b4fd 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_value_valarray.pass.cpp
index 246a48532..295dd6bdc 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/or_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_valarray.pass.cpp
index 82ebebaa7..19a410e4f 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_value.pass.cpp
index 68c752821..2aef9c1a1 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_value_valarray.pass.cpp
index 723ec62d8..ba598f62d 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/plus_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_valarray.pass.cpp
index 31d50eeb8..e71fa1056 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_value.pass.cpp
index 646b55ed3..3945c1bf4 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_value_valarray.pass.cpp
index 5ddce6fd4..932763452 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_left_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_valarray.pass.cpp
index b6c4c1150..9422d6be8 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_value.pass.cpp
index abc7726de..8a68f30ca 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_value_valarray.pass.cpp
index 956ec055c..519fd2b3b 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/shift_right_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_valarray.pass.cpp
index 23cbdbe92..bc5e7329c 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_value.pass.cpp
index cf87f0094..330f5e0a7 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_value_valarray.pass.cpp
index 23b078e2d..4fa8bb2d2 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/times_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_valarray.pass.cpp
index e550d0c7f..fd4fb084c 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -33,4 +32,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_value.pass.cpp
index d7d5aa497..c5082f553 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_value_valarray.pass.cpp
index 3e83ff9ae..377f03ed3 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.binary/xor_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == a2[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_valarray.pass.cpp
index 003ed3d2c..3f3ede056 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_value.pass.cpp
index 59f2999a2..de5808e57 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -43,4 +42,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_value_valarray.pass.cpp
index 9be01bfcd..c73ec1e54 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/and_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -43,4 +42,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_valarray.pass.cpp
index 78dabed3a..187126fc8 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_value.pass.cpp
index 31c040bfe..01c04a62c 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_value_valarray.pass.cpp
index 89d627de5..b0db6a0d1 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/equal_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_valarray.pass.cpp
index f4a5e18e8..c8de6208a 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_value.pass.cpp
index f0ea1e9f1..cf568b530 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_value_valarray.pass.cpp
index 99b97d55c..c66a60e06 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_equal_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_valarray.pass.cpp
index bdfd191e4..351b662be 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_value.pass.cpp
index a6cef8672..f895b0783 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_value_valarray.pass.cpp
index 712e39681..a54b77025 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/greater_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_valarray.pass.cpp
index 8ba8394fa..c8812f3fd 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_value.pass.cpp
index 242ce8a42..03caf34a6 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_value_valarray.pass.cpp
index 1b9ea4dcc..5026b73d4 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_equal_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_valarray.pass.cpp
index 5a5408537..59943f912 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_value.pass.cpp
index 50b074a1b..9ced47571 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_value_valarray.pass.cpp
index 248037d44..770d5a96f 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/less_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_valarray.pass.cpp
index a4404d14a..1892a7071 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_value.pass.cpp
index 45df48f94..3cdb89739 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_value_valarray.pass.cpp
index 854546447..49ffeda05 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/not_equal_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_valarray.pass.cpp
index 1f2a7da96..f62cb4f8c 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -35,4 +34,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_value.pass.cpp
index 426c0558b..df73f85e3 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -43,4 +42,6 @@ int main()
         for (std::size_t i = 0; i < v1.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_value_valarray.pass.cpp
index 3bf0fe79d..3798acc67 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.comparison/or_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -43,4 +42,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.special/swap.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.special/swap.pass.cpp
index cb1807bf3..2200ddfe0 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.special/swap.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -85,4 +84,6 @@ int main()
         for (std::size_t i = 0; i < v2.size(); ++i)
             assert(v2[i] == v1_save[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/abs_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/abs_valarray.pass.cpp
index 9af8b1a93..d721c8442 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/abs_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/abs_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -32,4 +31,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(v3[i] == a3[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/acos_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/acos_valarray.pass.cpp
index 2814e2ed1..18b5bcb5b 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/acos_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/acos_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/asin_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/asin_valarray.pass.cpp
index f2f873cc6..9401200e5 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/asin_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/asin_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
index d5ae07be3..fcbd63b83 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -51,4 +50,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_value.pass.cpp
index 8345f950d..59928d447 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_value_valarray.pass.cpp
index f28a69a17..ed42627d1 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan_valarray.pass.cpp
index 78740a2b8..7176b9343 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cos_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cos_valarray.pass.cpp
index eb5b9a307..bc58e4af2 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cos_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cos_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cosh_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cosh_valarray.pass.cpp
index f8075d31b..b453edd08 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cosh_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/cosh_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/exp_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/exp_valarray.pass.cpp
index 741e1abba..8e95f8704 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/exp_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/exp_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log10_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log10_valarray.pass.cpp
index a2cfe6846..39514ed68 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log10_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log10_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log_valarray.pass.cpp
index d3795f97f..050d58fa5 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/log_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_valarray.pass.cpp
index d0f8bdb7c..93b8a14cb 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -51,4 +50,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_value.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_value.pass.cpp
index 22017237b..62c140c04 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_value.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_valarray_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_value_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_value_valarray.pass.cpp
index e34f664c2..0c8a76b6d 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_value_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/pow_value_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sin_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sin_valarray.pass.cpp
index 30b30caf9..92d6f4492 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sin_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sin_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sinh_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sinh_valarray.pass.cpp
index 6fbb4f063..190c212ac 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sinh_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sinh_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sqrt_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sqrt_valarray.pass.cpp
index e577a83ad..805bde633 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sqrt_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/sqrt_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tan_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tan_valarray.pass.cpp
index 9db12a351..4f5b69d08 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tan_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tan_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tanh_valarray.pass.cpp b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tanh_valarray.pass.cpp
index dfcd53106..c63696a83 100644
--- a/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tanh_valarray.pass.cpp
+++ b/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/tanh_valarray.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ bool is_about(double x, double y, int p)
     return a == o.str();
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef double T;
@@ -49,4 +48,6 @@ int main()
         for (std::size_t i = 0; i < v3.size(); ++i)
             assert(is_about(v3[i], a3[i], 10));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.range/begin_const.pass.cpp b/test/std/numerics/numarray/valarray.range/begin_const.pass.cpp
index 873c4847e..35e5e4206 100644
--- a/test/std/numerics/numarray/valarray.range/begin_const.pass.cpp
+++ b/test/std/numerics/numarray/valarray.range/begin_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -27,4 +26,6 @@ int main()
         const std::valarray<T> v(a, N);
         assert(v[0] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.range/begin_non_const.pass.cpp b/test/std/numerics/numarray/valarray.range/begin_non_const.pass.cpp
index 0a39d009f..e0d8e71da 100644
--- a/test/std/numerics/numarray/valarray.range/begin_non_const.pass.cpp
+++ b/test/std/numerics/numarray/valarray.range/begin_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <valarray>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -28,4 +27,6 @@ int main()
         *begin(v) = 10;
         assert(v[0] == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.range/end_const.pass.cpp b/test/std/numerics/numarray/valarray.range/end_const.pass.cpp
index 4d0015343..d1424d3f0 100644
--- a/test/std/numerics/numarray/valarray.range/end_const.pass.cpp
+++ b/test/std/numerics/numarray/valarray.range/end_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -29,4 +28,6 @@ int main()
         assert(v[v.size()-1] == 5);
         assert(static_cast<std::size_t>(end(v) - begin(v)) == v.size());
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.range/end_non_const.pass.cpp b/test/std/numerics/numarray/valarray.range/end_non_const.pass.cpp
index 012434e8a..5e1cbd4a8 100644
--- a/test/std/numerics/numarray/valarray.range/end_non_const.pass.cpp
+++ b/test/std/numerics/numarray/valarray.range/end_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -30,4 +29,6 @@ int main()
         assert(v[v.size()-1] == 10);
         assert(static_cast<std::size_t>(end(v) - begin(v)) == v.size());
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numarray/valarray.syn/nothing_to_do.pass.cpp b/test/std/numerics/numarray/valarray.syn/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numarray/valarray.syn/nothing_to_do.pass.cpp
+++ b/test/std/numerics/numarray/valarray.syn/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp b/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp
index aae97ef41..80a048d07 100644
--- a/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp
+++ b/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,11 +42,13 @@ test()
     test(Iter(ia), Iter(ia+sa), 10, 31);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*> >();
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*> >();
     test<const int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp b/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp
index 19a872868..c7a55b971 100644
--- a/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp
+++ b/test/std/numerics/numeric.ops/accumulate/accumulate_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,11 +44,13 @@ test()
     test(Iter(ia), Iter(ia+sa), 10, 7200);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*> >();
     test<forward_iterator<const int*> >();
     test<bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*> >();
     test<const int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp b/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp
index f999c5045..3e043e5cb 100644
--- a/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp
+++ b/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,7 +75,7 @@ public:
 
 #endif
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -113,4 +112,6 @@ int main()
     Y y[3] = {Y(1), Y(2), Y(3)};
     std::adjacent_difference(x, x+3, y);
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp b/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp
index 8a30a8221..9a10105d0 100644
--- a/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp
+++ b/test/std/numerics/numeric.ops/adjacent.difference/adjacent_difference_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -79,7 +78,7 @@ public:
 #endif
 
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -116,4 +115,6 @@ int main()
     Y y[3] = {Y(1), Y(2), Y(3)};
     std::adjacent_difference(x, x+3, y, std::minus<X>());
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp b/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
index 7026b73c6..447ceb61e 100644
--- a/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
+++ b/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -86,7 +85,7 @@ void basic_tests()
 
 }
 
-int main()
+int main(int, char**)
 {
     basic_tests();
 
@@ -97,4 +96,6 @@ int main()
     test<random_access_iterator<const int*> >();
     test<const int*>();
     test<      int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp b/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
index 4fd5e236e..46cb0800b 100644
--- a/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
+++ b/test/std/numerics/numeric.ops/exclusive.scan/exclusive_scan_init_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ test()
         }
 }
 
-int main()
+int main(int, char**)
 {
 //  All the iterator categories
     test<input_iterator        <const int*> >();
@@ -86,4 +85,6 @@ int main()
         assert(res[i] == j);
     }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp b/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
index 2058b8e3d..0ab019c5e 100644
--- a/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
+++ b/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -91,7 +90,7 @@ void basic_tests()
     }
 }
 
-int main()
+int main(int, char**)
 {
     basic_tests();
 
@@ -102,4 +101,6 @@ int main()
     test<random_access_iterator<const int*> >();
     test<const int*>();
     test<      int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp b/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
index ca4da9841..88633ac84 100644
--- a/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
+++ b/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -98,7 +97,7 @@ void basic_tests()
 }
 
 
-int main()
+int main(int, char**)
 {
 
     basic_tests();
@@ -111,4 +110,6 @@ int main()
 //     test<const int*>();
 //     test<      int*>();
 
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp b/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
index c3b0feb34..c6e691aee 100644
--- a/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
+++ b/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -114,7 +113,7 @@ void basic_tests()
 }
 
 
-int main()
+int main(int, char**)
 {
 
     basic_tests();
@@ -127,4 +126,6 @@ int main()
     test<const int*>();
     test<      int*>();
 
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp b/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp
index 68a8c49b8..fa5c1e834 100644
--- a/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp
+++ b/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test()
     test(Iter1(a), Iter1(a+sa), Iter2(b), 10, 66);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*> >();
     test<input_iterator<const int*>, forward_iterator<const int*> >();
@@ -79,4 +78,6 @@ int main()
     test<const int*, bidirectional_iterator<const int*> >();
     test<const int*, random_access_iterator<const int*> >();
     test<const int*, const int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp b/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp
index 31dbbd0be..e42e3cea9 100644
--- a/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp
+++ b/test/std/numerics/numeric.ops/inner.product/inner_product_comp.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ test()
     test(Iter1(a), Iter1(a+sa), Iter2(b), 10, 1176490);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, input_iterator<const int*> >();
     test<input_iterator<const int*>, forward_iterator<const int*> >();
@@ -82,4 +81,6 @@ int main()
     test<const int*, bidirectional_iterator<const int*> >();
     test<const int*, random_access_iterator<const int*> >();
     test<const int*, const int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp b/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp
index eb7c8373a..2c1c08e8b 100644
--- a/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp
+++ b/test/std/numerics/numeric.ops/numeric.iota/iota.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,10 +28,12 @@ test()
         assert(ia[i] == ir[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test<forward_iterator<int*> >();
     test<bidirectional_iterator<int*> >();
     test<random_access_iterator<int*> >();
     test<int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool1.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool1.fail.cpp
index 7a8a60835..1c56a6707 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool1.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::gcd(false, 4);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool2.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool2.fail.cpp
index 909d7cbfc..9390e50f1 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool2.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::gcd(2, true);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool3.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool3.fail.cpp
index 75a1bc128..2aceb285b 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool3.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::gcd<volatile bool, int>(false, 4);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool4.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool4.fail.cpp
index 406b49850..234a4d7ce 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool4.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.bool4.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::gcd<int, const bool>(2, true);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral1.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral1.fail.cpp
index 9354a4eb0..1aeb5249f 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral1.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::gcd(2.0, 4);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral2.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral2.fail.cpp
index fa1b7da48..89079181b 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral2.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.not_integral2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::gcd(4, 6.0);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp
index 517a62a00..bba3780bd 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -92,7 +91,7 @@ constexpr bool do_test(int = 0)
     return accumulate;
 }
 
-int main()
+int main(int, char**)
 {
     auto non_cce = std::rand(); // a value that can't possibly be constexpr
 
@@ -142,4 +141,6 @@ int main()
     static_assert(std::is_same_v<decltype(res), std::int64_t>, "");
     assert(res == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool1.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool1.fail.cpp
index 1492c25ad..ab199d7a8 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool1.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::lcm(false, 4);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool2.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool2.fail.cpp
index de891f3ee..68bfd1d21 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool2.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::lcm(2, true);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool3.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool3.fail.cpp
index d2a7f52e5..4f4042267 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool3.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::lcm<volatile bool, int>(false, 4);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool4.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool4.fail.cpp
index 88ca68bf0..2cdbcefdc 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool4.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.bool4.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::lcm<int, const bool>(2, true);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral1.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral1.fail.cpp
index 082631dc0..968034b02 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral1.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::lcm(2.0, 4);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral2.fail.cpp b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral2.fail.cpp
index 8ab68a4e6..ed2813f6a 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral2.fail.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.not_integral2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,9 @@
 #include <numeric>
 
 
-int main()
+int main(int, char**)
 {
     std::lcm(4, 6.0);
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.pass.cpp b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.pass.cpp
index d96ca3225..8a0567061 100644
--- a/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.pass.cpp
+++ b/test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -91,7 +90,7 @@ constexpr bool do_test(int = 0)
     return accumulate;
 }
 
-int main()
+int main(int, char**)
 {
     auto non_cce = std::rand(); // a value that can't possibly be constexpr
 
@@ -142,4 +141,6 @@ int main()
     static_assert(std::is_same_v<decltype(res1), std::int64_t>, "");
     assert(res1 == 1324997410816LL);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp b/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp
index cb468e019..4ea410712 100644
--- a/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp
+++ b/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ test()
         assert(ib[i] == ir[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -67,4 +66,6 @@ int main()
     test<const int*, bidirectional_iterator<int*> >();
     test<const int*, random_access_iterator<int*> >();
     test<const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp b/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp
index d8f2a93e4..ab51b5b5b 100644
--- a/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp
+++ b/test/std/numerics/numeric.ops/partial.sum/partial_sum_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ test()
         assert(ib[i] == ir[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test<input_iterator<const int*>, output_iterator<int*> >();
     test<input_iterator<const int*>, forward_iterator<int*> >();
@@ -69,4 +68,6 @@ int main()
     test<const int*, bidirectional_iterator<int*> >();
     test<const int*, random_access_iterator<int*> >();
     test<const int*, int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp b/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp
index aa055e70d..031a12d29 100644
--- a/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp
+++ b/test/std/numerics/numeric.ops/reduce/reduce.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_return_type()
     static_assert( std::is_same_v<T, decltype(std::reduce(p, p))> );
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<char>();
     test_return_type<int>();
@@ -60,4 +59,6 @@ int main()
     test<bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*> >();
     test<const int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp b/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp
index 480ead11c..19c6b7d5f 100644
--- a/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp
+++ b/test/std/numerics/numeric.ops/reduce/reduce_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void test_return_type()
     static_assert( std::is_same_v<Init, decltype(std::reduce(p, p, Init{}))> );
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<char, int>();
     test_return_type<int, int>();
@@ -64,4 +63,6 @@ int main()
     test<bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*> >();
     test<const int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp b/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp
index cff1b8c0a..adcf92879 100644
--- a/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp
+++ b/test/std/numerics/numeric.ops/reduce/reduce_init_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void test_return_type()
     static_assert( std::is_same_v<Init, decltype(std::reduce(p, p, Init{}, std::plus<>()))>, "" );
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<char, int>();
     test_return_type<int, int>();
@@ -71,4 +70,6 @@ int main()
     unsigned res = std::reduce(v.begin(), v.end(), 1U, std::multiplies<>());
     assert(res == 40320);       // 8! will not fit into a char
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp b/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
index ff0cb29f4..528802cb4 100644
--- a/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
+++ b/test/std/numerics/numeric.ops/transform.exclusive.scan/transform_exclusive_scan_init_bop_uop.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void basic_tests()
     }
 }
 
-int main()
+int main(int, char**)
 {
     basic_tests();
 
@@ -151,4 +150,6 @@ int main()
     test<random_access_iterator<const int*> >();
     test<const int*>();
     test<      int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp b/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
index 48aeadb87..f7a321317 100644
--- a/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
+++ b/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
@@ -1,10 +1,9 @@
 
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -114,7 +113,7 @@ void basic_tests()
     }
 }
 
-int main()
+int main(int, char**)
 {
     basic_tests();
 
@@ -125,4 +124,6 @@ int main()
     test<random_access_iterator<const int*> >();
     test<const int*>();
     test<      int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp b/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
index 00c4aafdf..56e5bc6e7 100644
--- a/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
+++ b/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void basic_tests()
     }
 }
 
-int main()
+int main(int, char**)
 {
     basic_tests();
 
@@ -151,4 +150,6 @@ int main()
     test<random_access_iterator<const int*> >();
     test<const int*>();
     test<      int*>();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp b/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp
index c5bcaf148..38071531b 100644
--- a/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp
+++ b/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_init_bop_uop.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ void test_move_only_types()
         [](const MoveOnly& target) { return MoveOnly{target.get() * 10}; }).get());
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<char, int>();
     test_return_type<int, int>();
@@ -118,4 +117,6 @@ int main()
     }
 
     test_move_only_types();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp b/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp
index a79b4e98f..d74267c71 100644
--- a/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp
+++ b/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ void test_move_only_types()
         std::transform_reduce(std::begin(ia), std::end(ia), std::begin(ib), MoveOnly{0}).get());
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<char, int>();
     test_return_type<int, int>();
@@ -104,4 +103,6 @@ int main()
     test<      int*,       unsigned int *>();
 
     test_move_only_types();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp b/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp
index f60a0f149..27bad12ce 100644
--- a/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp
+++ b/test/std/numerics/numeric.ops/transform.reduce/transform_reduce_iter_iter_iter_init_op_op.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,7 @@ void test_move_only_types()
         [](const MoveOnly& lhs, const MoveOnly& rhs) { return MoveOnly{lhs.get() * rhs.get()}; }).get());
 }
 
-int main()
+int main(int, char**)
 {
     test_return_type<char, int>();
     test_return_type<int, int>();
@@ -108,4 +107,6 @@ int main()
     test<      int*,       unsigned int *>();
 
     test_move_only_types();
+
+  return 0;
 }
diff --git a/test/std/numerics/numeric.requirements/nothing_to_do.pass.cpp b/test/std/numerics/numeric.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numeric.requirements/nothing_to_do.pass.cpp
+++ b/test/std/numerics/numeric.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/numerics.general/nothing_to_do.pass.cpp b/test/std/numerics/numerics.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/numerics.general/nothing_to_do.pass.cpp
+++ b/test/std/numerics/numerics.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/nothing_to_do.pass.cpp b/test/std/numerics/rand/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.adapt/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.adapt/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/assign.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/assign.pass.cpp
index 5238915ee..5deb1d50c 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,8 +48,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/copy.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/copy.pass.cpp
index 80417e5d6..443f4f8d8 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,8 +46,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_copy.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_copy.pass.cpp
index d6b8b33ad..57f2bcc76 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::ranlux24_base Engine;
@@ -26,4 +25,6 @@ int main()
         Adaptor a(e);
         assert(a.base() == e);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_move.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_move.pass.cpp
index 1e8e2fe6f..ade8e8d81 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_move.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_engine_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::ranlux24_base Engine;
@@ -27,4 +26,6 @@ int main()
         Adaptor a(std::move(e0));
         assert(a.base() == e);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_result_type.pass.cpp
index dba254f1a..6fe094763 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,8 +43,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_sseq.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_sseq.pass.cpp
index b64d4b316..fe2d9fea3 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/ctor_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,8 +47,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/default.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/default.pass.cpp
index ffdaebc17..32af7046f 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/default.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,8 +34,10 @@ test2()
     assert(e1() == 23459059301164ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/discard.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/discard.pass.cpp
index d10b7c5e8..a6f4d64e3 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/discard.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/discard.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,8 +44,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/eval.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/eval.pass.cpp
index f819d6a97..75f07aeca 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,8 +34,10 @@ test2()
     assert(e() == 276846226770426ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/io.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/io.pass.cpp
index 4b742f06a..a9fbd7963 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/io.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,8 +55,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/result_type.pass.cpp
index 2634aba38..a18e09bd1 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,8 +34,10 @@ test2()
         std::uint_fast64_t>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_result_type.pass.cpp
index 6a5ff14f7..bfa93767e 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,8 +42,10 @@ test2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_sseq.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_sseq.pass.cpp
index 0da09a379..5506cffa1 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/seed_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,8 +40,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/values.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/values.pass.cpp
index 5666fdce2..423a629e7 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.disc/values.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.disc/values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,8 +64,10 @@ test2()
     where(E::used_block);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/assign.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/assign.pass.cpp
index 4484b3db4..79205aacc 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,8 +48,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/copy.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/copy.pass.cpp
index 6a01af4bf..22e68626e 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,8 +46,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_copy.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_copy.pass.cpp
index 193f5c33e..65fad3e2f 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::mt19937 Engine;
@@ -26,4 +25,6 @@ int main()
         Adaptor a(e);
         assert(a.base() == e);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_move.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_move.pass.cpp
index 60a661d39..f3b1d526f 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_move.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_engine_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::mt19937 Engine;
@@ -27,4 +26,6 @@ int main()
         Adaptor a(std::move(e0));
         assert(a.base() == e);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_result_type.pass.cpp
index 8e8d3091a..84817b16e 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,8 +43,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_sseq.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_sseq.pass.cpp
index 7965f4397..d2792f98f 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/ctor_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,8 +47,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/default.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/default.pass.cpp
index ccb6f379d..d7e72e3e7 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/default.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,8 +34,10 @@ test2()
     assert(e1() == 18223106896348967647ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/discard.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/discard.pass.cpp
index a1b4dd7d7..8f2921923 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/discard.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/discard.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,8 +44,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/eval.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/eval.pass.cpp
index a5893ead7..9d60eaba3 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -130,7 +129,7 @@ test8()
     assert(e() == 16470362623952407241ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -140,4 +139,6 @@ int main()
     test6();
     test7();
     test8();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/io.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/io.pass.cpp
index 9bcf06488..b1a73193c 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/io.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,8 +55,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/result_type.pass.cpp
index 9ae955478..1b6fb87e3 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -78,8 +77,10 @@ test2()
         unsigned long long>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_result_type.pass.cpp
index e8c24ca5f..8225044d7 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,8 +42,10 @@ test2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_sseq.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_sseq.pass.cpp
index ec83fff7f..04374d000 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/seed_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,8 +40,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/values.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/values.pass.cpp
index 6076f934f..be25ad1e2 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/values.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.ibits/values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,8 +51,10 @@ test2()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/assign.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/assign.pass.cpp
index 652e6487a..da08f58ed 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,9 @@ test1()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/copy.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/copy.pass.cpp
index de26e2dc7..5788371c3 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,9 @@ test1()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_copy.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_copy.pass.cpp
index e71aa1d89..0cc29d496 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::minstd_rand0 Engine;
@@ -30,4 +29,6 @@ int main()
 
         assert(a.base() == e);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_move.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_move.pass.cpp
index 4a347b5d5..35474e6a0 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_move.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_engine_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::minstd_rand0 Engine;
@@ -31,4 +30,6 @@ int main()
 
         assert(a.base() == e);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_result_type.pass.cpp
index 320249497..5ca51e151 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,9 @@ test1()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_sseq.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_sseq.pass.cpp
index a08df07b3..136e7fe87 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/ctor_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,9 @@ test1()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/default.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/default.pass.cpp
index 7b4bc5820..fff5cee2d 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/default.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(e1() == 152607844u);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/discard.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/discard.pass.cpp
index b442a76ad..1b86048c2 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/discard.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/discard.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,9 @@ test1()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/eval.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/eval.pass.cpp
index d2a5292e1..4eecfea81 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -87,9 +86,11 @@ test3()
     assert(e() == 500);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/io.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/io.pass.cpp
index 6c8fdb998..5d80b3afc 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/io.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,9 @@ test1()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/result_type.pass.cpp
index a6f1eadb0..bcb08557c 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -78,8 +77,10 @@ test2()
         unsigned long long>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_result_type.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_result_type.pass.cpp
index 57ded845e..24ccfbbf8 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,9 @@ test1()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_sseq.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_sseq.pass.cpp
index 4b4b099bc..8dfbcb00e 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/seed_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,9 @@ test1()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/values.pass.cpp b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/values.pass.cpp
index ac3f1d711..d98fdf58a 100644
--- a/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/values.pass.cpp
+++ b/test/std/numerics/rand/rand.adapt/rand.adapt.shuf/values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,9 @@ test1()
     where(E::table_size);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.device/ctor.pass.cpp b/test/std/numerics/rand/rand.device/ctor.pass.cpp
index 5d72e474e..24e372795 100644
--- a/test/std/numerics/rand/rand.device/ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.device/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ void check_random_device_invalid(const std::string &token) {
 }
 
 
-int main() {
+int main(int, char**) {
   {
     std::random_device r;
   }
@@ -100,4 +99,6 @@ int main() {
     std::random_device r;
   }
 #endif // !defined(_WIN32)
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.device/entropy.pass.cpp b/test/std/numerics/rand/rand.device/entropy.pass.cpp
index 141a84a6d..539c238ba 100644
--- a/test/std/numerics/rand/rand.device/entropy.pass.cpp
+++ b/test/std/numerics/rand/rand.device/entropy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::random_device r;
     double e = r.entropy();
     ((void)e); // Prevent unused warning
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.device/eval.pass.cpp b/test/std/numerics/rand/rand.device/eval.pass.cpp
index e5a2a32ee..4b68282f7 100644
--- a/test/std/numerics/rand/rand.device/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.device/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::random_device r;
@@ -46,4 +45,6 @@ int main()
     {
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.dis/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.dis/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/assign.pass.cpp
index e55c1579c..5ed93470d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/copy.pass.cpp
index c64f925b4..e3d866ad4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_double.pass.cpp
index 5d511fcc6..a8f76bb23 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -33,4 +32,6 @@ int main()
         D d(0.75);
         assert(d.p() == 0.75);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_param.pass.cpp
index a143b5a68..a568cb2b7 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -25,4 +24,6 @@ int main()
         D d(p);
         assert(d.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eq.pass.cpp
index b77c12eed..24babc118 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -33,4 +32,6 @@ int main()
         D d2(.25);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval.pass.cpp
index 0118ae0bf..e28c39099 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -101,4 +100,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.02);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval_param.pass.cpp
index 0cdb0b77a..bf1d11743 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -105,4 +104,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.02);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/get_param.pass.cpp
index 1b4eae90b..0e960d6ac 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -25,4 +24,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/io.pass.cpp
index 5f57145e1..7c7829796 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -37,4 +36,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/max.pass.cpp
index 8e669bbda..6f4ac7e3d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
         D d(.25);
         assert(d.max() == true);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/min.pass.cpp
index 296ad1474..8c369dbf8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
         D d(.5);
         assert(d.min() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_assign.pass.cpp
index a24dd0dfc..b4fcd04ec 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -27,4 +26,6 @@ int main()
         p = p0;
         assert(p.p() == .7);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_copy.pass.cpp
index 6c4eaeee4..96ddd4bc4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -26,4 +25,6 @@ int main()
         param_type p = p0;
         assert(p.p() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_ctor.pass.cpp
index c43f44721..612e6c686 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -31,4 +30,6 @@ int main()
         param_type p(0.25);
         assert(p.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_eq.pass.cpp
index ee5dfe867..cde5611ec 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -33,4 +32,6 @@ int main()
         param_type p2(0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_types.pass.cpp
index 5a3b90332..e1d9532f0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -24,4 +23,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/set_param.pass.cpp
index 9869ac6fc..03e3d8a8c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
@@ -26,4 +25,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/types.pass.cpp
index 4b6c4be1a..539b809b0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bernoulli/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::bernoulli_distribution D;
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, bool>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/assign.pass.cpp
index 82473d288..e997198ad 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/copy.pass.cpp
index 715494886..2c2b65c94 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_int_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_int_double.pass.cpp
index 5a3a22eee..26a6e3a66 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_int_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_int_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.t() == 3);
         assert(d.p() == 0.75);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_param.pass.cpp
index cfb98f298..fa69b9123 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.t() == 5);
         assert(d.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eq.pass.cpp
index 738bdc80e..dbe086ad4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -40,4 +39,6 @@ int main()
         D d2(4, .25);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp
index de5b153e0..fea71ccb8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -507,7 +506,7 @@ test11()
 //    assert(kurtosis == x_kurtosis);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -520,4 +519,6 @@ int main()
     test9();
     test10();
     test11();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval_param.pass.cpp
index 5ce0cb412..cd4d00678 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -157,4 +156,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.04);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.3);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/get_param.pass.cpp
index 88c8424b0..a3ba48f55 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/io.pass.cpp
index 1276454b5..cb272152a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/max.pass.cpp
index 9c88faabe..c8ca662b6 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
         D d(4, .25);
         assert(d.max() == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/min.pass.cpp
index 678a34b2f..ce793f67b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
         D d(4, .5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_assign.pass.cpp
index 553f8ad82..069d6e440 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.t() == 6);
         assert(p.p() == .7);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_copy.pass.cpp
index a9770efa2..f2b78e6d8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.t() == 10);
         assert(p.p() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_ctor.pass.cpp
index cadf84a89..8ba09a681 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.t() == 10);
         assert(p.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_eq.pass.cpp
index 3c2c1faa5..0ba4381ad 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(3, 0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_types.pass.cpp
index 6c745611c..ba94d412a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/set_param.pass.cpp
index 612f5e2de..ec82a93ff 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/types.pass.cpp
index 0e71aa019..c52681a13 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.bin/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::binomial_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, long>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/assign.pass.cpp
index f71b37482..ae49feb3e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/copy.pass.cpp
index 00f3d04ae..73ff6d68f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_double.pass.cpp
index 461542896..1d4388e4d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         D d(0.75);
         assert(d.p() == 0.75);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_param.pass.cpp
index 5cf93eb46..3bcebc36f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eq.pass.cpp
index 38d423bb5..47ea0f282 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(.25);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp
index 6e6072a4f..46ec88121 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -287,7 +286,7 @@ test6()
     assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.02);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -295,4 +294,6 @@ int main()
     test4();
     test5();
     test6();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval_param.pass.cpp
index 254c347b3..825fa3f5c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -157,4 +156,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.02);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/get_param.pass.cpp
index 00797a119..35679a862 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/io.pass.cpp
index 3e3752af7..36de49f78 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/max.pass.cpp
index b381bc438..9e785da2e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
         D d(.25);
         assert(d.max() == std::numeric_limits<int>::max());
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/min.pass.cpp
index 56b75a7f8..63f69f25e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
         D d(.5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_assign.pass.cpp
index 98b84d59a..c88af2d68 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         p = p0;
         assert(p.p() == .7);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_copy.pass.cpp
index 4397aecfb..117b98bc1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         param_type p = p0;
         assert(p.p() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_ctor.pass.cpp
index c78525fea..717102285 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -32,4 +31,6 @@ int main()
         param_type p(0.25);
         assert(p.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_eq.pass.cpp
index 374f2b0b8..a741f06f6 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_types.pass.cpp
index 33a4c6fff..2f9efc268 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/set_param.pass.cpp
index e8aee01fb..74d49d5d8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/types.pass.cpp
index 367e3f987..a62b66134 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.geo/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::geometric_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, long>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/assign.pass.cpp
index f62c52eca..20f7f9ffd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/copy.pass.cpp
index 37c003d35..73ee12e43 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_int_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_int_double.pass.cpp
index babf1d464..0b9418b7c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_int_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_int_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.k() == 3);
         assert(d.p() == 0.75);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_param.pass.cpp
index 109a47e87..485a3ae98 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.k() == 5);
         assert(d.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eq.pass.cpp
index 0bf34eed6..b93084e47 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -40,4 +39,6 @@ int main()
         D d2(4, .25);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval.pass.cpp
index 17503364e..4a8f78842 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -285,7 +284,7 @@ test6()
     assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.03);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -293,4 +292,6 @@ int main()
     test4();
     test5();
     test6();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval_param.pass.cpp
index 6467dbf57..b99f6fb07 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -157,4 +156,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.03);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/get_param.pass.cpp
index 65f4a978c..63fe38043 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/io.pass.cpp
index da5e8af61..a26f19906 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/max.pass.cpp
index 2fe7184e6..3bc54a4be 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
         D d(4, .25);
         assert(d.max() == std::numeric_limits<int>::max());
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/min.pass.cpp
index 15bec5a7d..b2354d77c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
         D d(4, .5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_assign.pass.cpp
index dc4d35c70..7968b01e8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.k() == 6);
         assert(p.p() == .7);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_copy.pass.cpp
index ec5af5b85..b16818b26 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.k() == 10);
         assert(p.p() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_ctor.pass.cpp
index 6d713ce71..ad7908d31 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.k() == 10);
         assert(p.p() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_eq.pass.cpp
index b0f81cdfa..793b4361c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(3, 0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_types.pass.cpp
index 282ca190c..c0164edc8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/set_param.pass.cpp
index 05c204f5c..8971be5ee 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/types.pass.cpp
index 149f50752..ea177377a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.bern/rand.dist.bern.negbin/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::negative_binomial_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, long>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/assign.pass.cpp
index 3003e0db9..dfe8785ff 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/copy.pass.cpp
index 032191493..85511d161 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_double_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_double_double.pass.cpp
index a0406b026..f452b6e0b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_double_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_double_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.a() == 14.5);
         assert(d.b() == 5.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_param.pass.cpp
index 0973b60a7..3a8ed3cc9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.a() == 0.25);
         assert(d.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eq.pass.cpp
index 005e141b4..bc42b94f9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(2.5, 4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval.pass.cpp
index ca669dc41..2b63645ae 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -27,7 +26,7 @@ f(double x, double a, double b)
     return 1/3.1415926535897932 * std::atan((x - a)/b) + .5;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -74,4 +73,6 @@ int main()
         for (int i = 0; i < N; ++i)
             assert(std::abs(f(u[i], a, b) - double(i)/N) < .001);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval_param.pass.cpp
index 318c29e76..56921fe0f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -27,7 +26,7 @@ f(double x, double a, double b)
     return 1/3.1415926535897932 * std::atan((x - a)/b) + .5;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -80,4 +79,6 @@ int main()
         for (int i = 0; i < N; ++i)
             assert(std::abs(f(u[i], a, b) - double(i)/N) < .001);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/get_param.pass.cpp
index 0e2d6b049..c3c88b8d7 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/io.pass.cpp
index ca53792c6..db50cfd5c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/max.pass.cpp
index 263c1773a..963e8ed37 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/min.pass.cpp
index 0d52179ae..59044b8e2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
         D d(.5, .5);
         assert(d.min() == -INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_assign.pass.cpp
index f8e085283..04d94e74d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.a() == .75);
         assert(p.b() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_copy.pass.cpp
index 28ef06827..88739df68 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.a() == 10);
         assert(p.b() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_ctor.pass.cpp
index 8ae5137aa..8563bafbb 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.a() == 10);
         assert(p.b() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_eq.pass.cpp
index 6210321fb..97553701e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5, .5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_types.pass.cpp
index 56b1f6f91..ca0539c41 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/set_param.pass.cpp
index 201ec60b0..ba66ec16a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/types.pass.cpp
index 919a7b1b6..09f79da51 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.cauchy/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::cauchy_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/assign.pass.cpp
index 0c3a0aed2..75242c2b9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/copy.pass.cpp
index 9496184d4..3eeba40d0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_double.pass.cpp
index 27401d91e..a778b2fac 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         D d(14.5);
         assert(d.n() == 14.5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_param.pass.cpp
index afd5aa91c..922e44f61 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.n() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eq.pass.cpp
index 88630b0cf..8b9ad4574 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval.pass.cpp
index 3261880c6..b080886a8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -149,4 +148,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval_param.pass.cpp
index dbc2d09df..86ac86ed3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -155,4 +154,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/get_param.pass.cpp
index f12a0519b..55fda0872 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/io.pass.cpp
index de16fa1e1..101786131 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/max.pass.cpp
index adf4f96eb..19ab87ca9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/min.pass.cpp
index 4e51590bb..af5b45617 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
         D d(.5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_assign.pass.cpp
index 85730f619..0b13690f2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         p = p0;
         assert(p.n() == .75);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_copy.pass.cpp
index 3ddb02b72..22fe4b4ec 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         param_type p = p0;
         assert(p.n() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_ctor.pass.cpp
index 34d865115..b3bbd8668 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -32,4 +31,6 @@ int main()
         param_type p(10);
         assert(p.n() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_eq.pass.cpp
index cb738ea85..f615acad8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_types.pass.cpp
index 257016b3c..a6727c429 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/set_param.pass.cpp
index a8d4e52b8..d497407e1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/types.pass.cpp
index 614da1979..e33551deb 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.chisq/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::chi_squared_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/assign.pass.cpp
index f5294bdc5..c73d46ccb 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/copy.pass.cpp
index 047d51335..9a9670154 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_double_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_double_double.pass.cpp
index 1dd628b62..b29664ee4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_double_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_double_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.m() == 14.5);
         assert(d.n() == 5.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_param.pass.cpp
index 83a81cf40..3318d5222 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.m() == 0.25);
         assert(d.n() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eq.pass.cpp
index 405c906cb..b91da0511 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(2.5, 4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval.pass.cpp
index 8025880d8..9a4cdf175 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -46,7 +45,7 @@ f(double x, double m, double n)
     return I(m * x / (m*x + n), static_cast<unsigned>(m/2), static_cast<unsigned>(n/2));
 }
 
-int main()
+int main(int, char**)
 {
     // Purposefully only testing even integral values of m and n (for now)
     {
@@ -100,4 +99,6 @@ int main()
         for (int i = 0; i < N; ++i)
             assert(std::abs(f(u[i], d.m(), d.n()) - double(i)/N) < .01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval_param.pass.cpp
index 74025b701..59a19d57e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -46,7 +45,7 @@ f(double x, double m, double n)
     return I(m * x / (m*x + n), static_cast<unsigned>(m/2), static_cast<unsigned>(n/2));
 }
 
-int main()
+int main(int, char**)
 {
     // Purposefully only testing even integral values of m and n (for now)
     {
@@ -106,4 +105,6 @@ int main()
         for (int i = 0; i < N; ++i)
             assert(std::abs(f(u[i], p.m(), p.n()) - double(i)/N) < .01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/get_param.pass.cpp
index 572df9bed..716d852dd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/io.pass.cpp
index 8872a274b..870d086cc 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/max.pass.cpp
index dfdbd5d7d..5e9c2968b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/min.pass.cpp
index bd4c5d1a6..8aca42d94 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
         D d(.5, .5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_assign.pass.cpp
index ea44645e6..3622aeb39 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.m() == .75);
         assert(p.n() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_copy.pass.cpp
index d6ce53ae1..cc936174c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.m() == 10);
         assert(p.n() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_ctor.pass.cpp
index 1ab9138eb..b7bef507d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.m() == 10);
         assert(p.n() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_eq.pass.cpp
index 16eea408a..1345723ec 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5, .5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_types.pass.cpp
index 8391eedd2..8fdb9fccf 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/set_param.pass.cpp
index a7a1af662..cad5deda3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/types.pass.cpp
index b765725d1..567ed9f12 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.f/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::fisher_f_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/assign.pass.cpp
index 4da6451d9..567ae63b8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/copy.pass.cpp
index 777f4a1ac..f27ea836a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_double_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_double_double.pass.cpp
index 39d53393d..e19839f2a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_double_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_double_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.m() == 14.5);
         assert(d.s() == 5.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_param.pass.cpp
index f16567788..09ee798b8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.m() == 0.25);
         assert(d.s() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eq.pass.cpp
index 5fee0fd4c..7257f57b1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(2.5, 4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval.pass.cpp
index 82e8ffc77..908417548 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -249,11 +248,13 @@ test5()
     assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.7);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
     test4();
     test5();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval_param.pass.cpp
index 35596a0d7..1c40e66b2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -259,11 +258,13 @@ test5()
     assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.7);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
     test4();
     test5();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/get_param.pass.cpp
index 348ca6cfd..e56cae65b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/io.pass.cpp
index 4af0f2eaf..204a8f5f3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/max.pass.cpp
index 7ebfc43a3..2297a4160 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/min.pass.cpp
index 6af4df777..84154865b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
         D d(.5, .5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_assign.pass.cpp
index b23c770f5..9999b8499 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.m() == .75);
         assert(p.s() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_copy.pass.cpp
index 32ecc68da..6ad49592f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.m() == 10);
         assert(p.s() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_ctor.pass.cpp
index 2f109e3f5..cb1735b79 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.m() == 10);
         assert(p.s() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_eq.pass.cpp
index 2f4293a73..a6be4db10 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5, .5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_types.pass.cpp
index 6e53b269e..99f13be07 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/set_param.pass.cpp
index 09c183f51..992475717 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/types.pass.cpp
index 1a07000d5..6bff26088 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.lognormal/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::lognormal_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/assign.pass.cpp
index a7b2f71ab..492a0ea6a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/copy.pass.cpp
index 63f5be3c1..f2326bbc3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_double_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_double_double.pass.cpp
index 24a45f757..2c4462f25 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_double_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_double_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.mean() == 14.5);
         assert(d.stddev() == 5.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_param.pass.cpp
index 11c7fbd6e..66331187c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.mean() == 0.25);
         assert(d.stddev() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eq.pass.cpp
index b6bd3d316..87b7c4d7d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(2.5, 4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval.pass.cpp
index 2bf9204d3..5362aef09 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -67,4 +66,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs(kurtosis - x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval_param.pass.cpp
index 8527052c7..343bdd7dc 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -69,4 +68,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs(kurtosis - x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/get_param.pass.cpp
index 8b5d4328c..a29337106 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/io.pass.cpp
index 6d7943349..601f8d580 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/max.pass.cpp
index 3825704f5..24adfc05c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/min.pass.cpp
index 9ba754d37..0e2c27a18 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
         D d(.5, .5);
         assert(d.min() == -INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_assign.pass.cpp
index 2f7329b47..4a3786923 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.mean() == .75);
         assert(p.stddev() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_copy.pass.cpp
index bddf0023f..7ae72e6df 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.mean() == 10);
         assert(p.stddev() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_ctor.pass.cpp
index a1add140c..e947060e5 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.mean() == 10);
         assert(p.stddev() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_eq.pass.cpp
index cf2093808..cf7fa39cf 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5, .5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_types.pass.cpp
index 8d9b97e74..2fef65e8c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/set_param.pass.cpp
index bb01bb1c0..46f1cb2ee 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/types.pass.cpp
index 771685a8c..f532786c9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.normal/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::normal_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/assign.pass.cpp
index 80c0a1978..bb6ced5e8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/copy.pass.cpp
index 032cf77e8..a6aa61180 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_double.pass.cpp
index 7dfb97fb0..a133ff30c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         D d(14.5);
         assert(d.n() == 14.5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_param.pass.cpp
index 57dedea87..be11e9224 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.n() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eq.pass.cpp
index 73e834043..2de6ca551 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval.pass.cpp
index 6ae230180..bb1630ea4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -136,4 +135,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.02);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval_param.pass.cpp
index 983a2d243..3b939010a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -142,4 +141,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.02);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/get_param.pass.cpp
index a702a9fc5..170aed3db 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/io.pass.cpp
index d3ca6ee28..60f9a6fb3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/max.pass.cpp
index aab361eaa..f2fe36544 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/min.pass.cpp
index a615f8efe..ab98be450 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
         D d(.5);
         assert(d.min() == -INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_assign.pass.cpp
index e900c2566..54e9313ae 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         p = p0;
         assert(p.n() == .75);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_copy.pass.cpp
index 9ce6a9162..a27a735ca 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         param_type p = p0;
         assert(p.n() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_ctor.pass.cpp
index c9d0e131d..897a3e3cf 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -32,4 +31,6 @@ int main()
         param_type p(10);
         assert(p.n() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_eq.pass.cpp
index 83634b2e3..cd3a04a34 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_types.pass.cpp
index 6cdd5c403..1acecc1d1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/set_param.pass.cpp
index 681d335a5..85c6a3cb1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/types.pass.cpp
index 9a25ce2d6..f89da9f9e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.norm/rand.dist.norm.t/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::student_t_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/assign.pass.cpp
index c2a11a15b..bfee1f279 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/copy.pass.cpp
index 81ae8e012..41119b4fe 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_double.pass.cpp
index 92205a8ab..530d7de9a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         D d(3.5);
         assert(d.lambda() == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_param.pass.cpp
index cd9782bf4..174e91f8f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.lambda() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eq.pass.cpp
index e31a14d0d..609f226a5 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(.25);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval.pass.cpp
index 71aaa081b..bfe7e8da3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -149,4 +148,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval_param.pass.cpp
index 465f5a70a..00054a76e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -73,4 +72,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/get_param.pass.cpp
index f5bd8107e..9cb46bf04 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/io.pass.cpp
index eaedc8770..e8613480c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/max.pass.cpp
index 204cd7c0c..9859883c1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == std::numeric_limits<D::result_type>::infinity());
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/min.pass.cpp
index 60af4bc81..e19572952 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
         D d(.5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_assign.pass.cpp
index 1f5352192..9958d632b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         p = p0;
         assert(p.lambda() == .7);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_copy.pass.cpp
index 360bd5daa..676eac646 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         param_type p = p0;
         assert(p.lambda() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_ctor.pass.cpp
index 7d74c7fcc..8483bf9ff 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -32,4 +31,6 @@ int main()
         param_type p(10);
         assert(p.lambda() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_eq.pass.cpp
index 416d18cab..e36ffe029 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_types.pass.cpp
index 3d7371165..1b137acf9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/set_param.pass.cpp
index 6c295aa1b..7147b313c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/types.pass.cpp
index 3d444e631..289c2f1a4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.exp/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::exponential_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/assign.pass.cpp
index ff7cff45e..15333b048 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/copy.pass.cpp
index 303779768..a71dd8e31 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_double_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_double_double.pass.cpp
index f5068d98d..1123da3f2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_double_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_double_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.a() == 14.5);
         assert(d.b() == 5.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_param.pass.cpp
index cac06699e..4160b0337 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.a() == 0.25);
         assert(d.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eq.pass.cpp
index 6280df4f5..ab14c2ac5 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(2.5, 4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval.pass.cpp
index ecc663c6c..c83e78e01 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -193,10 +192,12 @@ test4()
     assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
     test4();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval_param.pass.cpp
index b69a04cc1..bf3df4455 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -201,10 +200,12 @@ test4()
     assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
     test4();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/get_param.pass.cpp
index 1855d5f73..27499a49a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/io.pass.cpp
index 0beaf4293..219d0f1e2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/max.pass.cpp
index ca89e355b..bfa6f2483 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/min.pass.cpp
index 1f98a5b17..bd97a0ba3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
         D d(.5, .5);
         assert(d.min() == -INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_assign.pass.cpp
index 44f587f62..b92b6fbe9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.a() == .75);
         assert(p.b() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_copy.pass.cpp
index 6675bab61..f64a32030 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.a() == 10);
         assert(p.b() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_ctor.pass.cpp
index 3fe3d49c3..906f7160a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.a() == 10);
         assert(p.b() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_eq.pass.cpp
index 3b55d569f..c4e4a7060 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5, .5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_types.pass.cpp
index d6ffb5f0c..30c46459b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/set_param.pass.cpp
index dcf0b1659..88fff04fb 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/types.pass.cpp
index 44dd1816c..e96c0d4ad 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.extreme/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::extreme_value_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/assign.pass.cpp
index 671f4b1cd..35eb5c277 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/copy.pass.cpp
index 876ecb27f..962374efe 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_double_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_double_double.pass.cpp
index 5bc4bbaea..31ce06d15 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_double_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_double_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.alpha() == 14.5);
         assert(d.beta() == 5.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_param.pass.cpp
index 35de51b1c..c78821f87 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.alpha() == 0.25);
         assert(d.beta() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eq.pass.cpp
index 48331a609..ee365f8e7 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(2.5, 4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval.pass.cpp
index 15d3a289b..f9e678d1c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -148,4 +147,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval_param.pass.cpp
index 12167c54f..aeb0bbf31 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -154,4 +153,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/get_param.pass.cpp
index 0aad32c64..82b1c9bfd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/io.pass.cpp
index a2a288adf..6732ca210 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/max.pass.cpp
index 9ec51932a..eb9e2b4f2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/min.pass.cpp
index a918c1479..3eda5a651 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
         D d(.5, .5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_assign.pass.cpp
index 31f346ed5..28d3997c4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.alpha() == .75);
         assert(p.beta() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_copy.pass.cpp
index c96cbcd2e..dc2b32dd7 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.alpha() == 10);
         assert(p.beta() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_ctor.pass.cpp
index c0e34f0b5..333b670f1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.alpha() == 10);
         assert(p.beta() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_eq.pass.cpp
index 2fe9c2d71..2ba854163 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5, .5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_types.pass.cpp
index 51e8eb123..0fc07ef95 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/set_param.pass.cpp
index 7e2262990..4af868a27 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/types.pass.cpp
index 65459e00f..31a33c0cf 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.gamma/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::gamma_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/assign.pass.cpp
index 5f1455525..4379d0bfd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/copy.pass.cpp
index 8abf7ffbd..60fa51933 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_double.pass.cpp
index 0cc82cac5..e27d13331 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         D d(3.5);
         assert(d.mean() == 3.5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_param.pass.cpp
index a24d7550b..117adb25a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.mean() == 0.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eq.pass.cpp
index 7bea12ec6..0d7dda0d9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(.25);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp
index 12fcfa354..588eddba2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -148,4 +147,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval_param.pass.cpp
index caa56eaab..67f726843 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -154,4 +153,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/get_param.pass.cpp
index 3f5f36769..a55a3837c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/io.pass.cpp
index 63805591b..4aec884f6 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/max.pass.cpp
index 2dffab3d1..b1cb12508 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == std::numeric_limits<int>::max());
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/min.pass.cpp
index 607d49b0e..e65319c56 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
         D d(.5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_assign.pass.cpp
index 1c31ea34a..393153a7c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         p = p0;
         assert(p.mean() == .7);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_copy.pass.cpp
index 19c05136e..a02e7250f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         param_type p = p0;
         assert(p.mean() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_ctor.pass.cpp
index 081e3a2d5..1e395fdfd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -32,4 +31,6 @@ int main()
         param_type p(10);
         assert(p.mean() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_eq.pass.cpp
index cbee35845..5e9aa27cc 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_types.pass.cpp
index c3136e048..b81d15cf0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/set_param.pass.cpp
index 86fe1f422..d75e6a1da 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/types.pass.cpp
index 05e8b112e..982919268 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.poisson/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::poisson_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, unsigned long long>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/assign.pass.cpp
index 31a2c4ad6..ff81b8120 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/copy.pass.cpp
index 68ef4dfea..0cfafa725 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_double_double.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_double_double.pass.cpp
index 34c670564..3f4d55eb9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_double_double.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_double_double.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -37,4 +36,6 @@ int main()
         assert(d.a() == 14.5);
         assert(d.b() == 5.25);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_param.pass.cpp
index 5db4f1da7..e876a2df0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.a() == 0.25);
         assert(d.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eq.pass.cpp
index 4c681c18b..1de323aef 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(2.5, 4.5);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval.pass.cpp
index ee0b68fb8..88e40b29c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -161,4 +160,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.03);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval_param.pass.cpp
index e13507672..3959f4407 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -167,4 +166,6 @@ int main()
         assert(std::abs((skew - x_skew) / x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.03);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/get_param.pass.cpp
index 5047a93e6..c2fbf7b98 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/io.pass.cpp
index 73b9aedba..6b4f4e9dd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/max.pass.cpp
index d3a44b305..3d9fe0b35 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D::result_type m = d.max();
         assert(m == INFINITY);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/min.pass.cpp
index fee46ab51..f92384041 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
         D d(.5, .5);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_assign.pass.cpp
index 2d978cda2..add72f685 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.a() == .75);
         assert(p.b() == 6);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_copy.pass.cpp
index 815a2c732..f2b7e95a4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.a() == 10);
         assert(p.b() == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_ctor.pass.cpp
index 3f9e29f8d..6a03330c1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.a() == 10);
         assert(p.b() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_eq.pass.cpp
index b94e6c19b..e47f57672 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(0.5, .5);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_types.pass.cpp
index 102f68d47..08c58d03d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/set_param.pass.cpp
index b200e43c5..f3c5a20d2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/types.pass.cpp
index 6f82c7047..51b97e081 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.pois/rand.dist.pois.weibull/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::weibull_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/assign.pass.cpp
index aee3f74f2..f1d5b3b24 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/copy.pass.cpp
index b133ac708..19f8dc179 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_default.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_default.pass.cpp
index 3c1ed6a18..f8d769dbd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_default.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         assert(p.size() == 1);
         assert(p[0] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
index 34af69382..198b845b3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ double fw(double x)
     return x+1;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -57,4 +56,6 @@ int main()
         assert(p[1] == .21875);
         assert(p[2] == .28125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_init.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_init.pass.cpp
index 031839317..a9c1e2bb4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_init.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -78,4 +77,6 @@ int main()
         assert(p[1] == 0);
         assert(p[2] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_iterator.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_iterator.pass.cpp
index 65e14eeed..66912cf4a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_iterator.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -84,4 +83,6 @@ int main()
         assert(p[1] == 0);
         assert(p[2] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_param.pass.cpp
index c12fe45db..a25c9fbd3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -30,4 +29,6 @@ int main()
         assert(p[0] == 0.25);
         assert(p[1] == 0.75);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eq.pass.cpp
index bad06987b..409cc39eb 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -42,4 +41,6 @@ int main()
         D d2;
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp
index 55080b252..5dd70d144 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -276,4 +275,6 @@ int main()
             else
                 assert(u[i] == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp
index 8d8a22424..6cc4e90b2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <vector>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -42,4 +41,6 @@ int main()
         for (int i = 0; i <= 2; ++i)
             assert(std::abs((double)u[i]/N - prob[i]) / prob[i] < 0.001);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/get_param.pass.cpp
index 4970c5aae..59e331282 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/io.pass.cpp
index 924995016..ff9434c8a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -39,4 +38,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/max.pass.cpp
index b1d1acdab..d36576391 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         D d(p0, p0+4);
         assert(d.max() == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/min.pass.cpp
index ab9383238..259eddc5d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         D d(p0, p0+3);
         assert(d.min() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_assign.pass.cpp
index ea57852b6..c50a2536c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         p = p0;
         assert(p == p0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_copy.pass.cpp
index b65ebb0d8..9b7e6b9ed 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         param_type p = p0;
         assert(p == p0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_default.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_default.pass.cpp
index bd2a8c83d..680ce405c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_default.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.size() == 1);
         assert(p[0] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
index 6d43b2234..4dd919dc4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ double fw(double x)
     return x+1;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -61,4 +60,6 @@ int main()
         assert(p[1] == .21875);
         assert(p[2] == .28125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_init.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_init.pass.cpp
index 1144bfed3..91adbdb07 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_init.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -85,4 +84,6 @@ int main()
         assert(p[1] == 0);
         assert(p[2] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_iterator.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_iterator.pass.cpp
index 7ef646707..b553ffab1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_iterator.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_ctor_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -91,4 +90,6 @@ int main()
         assert(p[1] == 0);
         assert(p[2] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_eq.pass.cpp
index 6ec2c2aad..3ca678693 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -36,4 +35,6 @@ int main()
         param_type p2;
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_types.pass.cpp
index 086b7600f..fab191602 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/set_param.pass.cpp
index bc433ec75..9858a30a7 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -28,4 +27,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/types.pass.cpp
index af73008ff..d45475ba3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.discrete/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::discrete_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, long>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/assign.pass.cpp
index e5c994445..3b63601ae 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/copy.pass.cpp
index a3eb1f4a5..82b0d8ef3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_default.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_default.pass.cpp
index e901afc39..836b69008 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_default.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -32,4 +31,6 @@ int main()
         assert(dn.size() == 1);
         assert(dn[0] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_func.pass.cpp
index 74fa23442..7e7537ad8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ double fw(double x)
     return 2*x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -61,4 +60,6 @@ int main()
         assert(dn[0] == 0.1);
         assert(dn[1] == 0.15);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_init_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_init_func.pass.cpp
index ecc3c8922..22c8a1f4e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_init_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_init_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ double f(double x)
     return x*2;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -75,4 +74,6 @@ int main()
         assert(dn[0] == 0.203125);
         assert(dn[1] == 0.1484375);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_iterator.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_iterator.pass.cpp
index d994b0a80..695a7ba5f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_iterator.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -93,4 +92,6 @@ int main()
         assert(dn[1] == .3125);
         assert(dn[2] == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_param.pass.cpp
index 0ccdba6b9..1a10bb31b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         assert(dn[1] == .3125);
         assert(dn[2] == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eq.pass.cpp
index 2ef9d7b6e..18b5d59bd 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -44,4 +43,6 @@ int main()
         D d2;
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp
index 14a59621f..d00be22e5 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -724,7 +723,7 @@ test11()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -737,4 +736,6 @@ int main()
     test9();
     test10();
     test11();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp
index b374c5ec2..c82a6b851 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -32,7 +31,7 @@ sqr(T x)
     return x*x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -96,4 +95,6 @@ int main()
             }
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp
index fdda4e8f0..90f469480 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         D d(pa);
         assert(d.param() == pa);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp
index 9af776d54..b22fdfa58 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp
index 772c36ed7..19c11c66f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         D d(b, b+Np+1, p);
         assert(d.max() == 17);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp
index 66618ba95..8a5fe519f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         D d(b, b+Np+1, p);
         assert(d.min() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp
index 4d3a50358..7c42c738c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         p1 = p0;
         assert(p1 == p0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp
index de63a54ed..f9eec8d73 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -30,4 +29,6 @@ int main()
         P p1 = p0;
         assert(p1 == p0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_default.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_default.pass.cpp
index fd84d4671..ac2f724b0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_default.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         assert(dn.size() == 1);
         assert(dn[0] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_func.pass.cpp
index 98e3006f3..d14a50817 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ double fw(double x)
     return 2*x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -64,4 +63,6 @@ int main()
         assert(dn[0] == 0.1);
         assert(dn[1] == 0.15);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_init_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_init_func.pass.cpp
index c037338cd..b7e5a4963 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_init_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_init_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ double f(double x)
     return x*2;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -76,4 +75,6 @@ int main()
         assert(dn[0] == 0.203125);
         assert(dn[1] == 0.1484375);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_iterator.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_iterator.pass.cpp
index 98d467c07..96dda54d2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_iterator.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_ctor_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -97,4 +96,6 @@ int main()
         assert(dn[1] == .3125);
         assert(dn[2] == .125);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_eq.pass.cpp
index 9cc554e60..4571613f9 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         P p2(b, b+4, p);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_types.pass.cpp
index e039df36c..3d4c25e88 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/set_param.pass.cpp
index 1a3fedb09..a34187cb2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         d.param(pa);
         assert(d.param() == pa);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/types.pass.cpp
index 760325979..eec866112 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.pconst/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_constant_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/assign.pass.cpp
index 0ba7dcb59..ff478a05b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/copy.pass.cpp
index 536b139dd..ba5e6d59a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_default.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_default.pass.cpp
index 99b0f5f4b..ded81c974 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_default.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -33,4 +32,6 @@ int main()
         assert(dn[0] == 1);
         assert(dn[1] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_func.pass.cpp
index 3ebaf77f7..175774dc0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ double fw(double x)
     return 2*x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -66,4 +65,6 @@ int main()
         assert(dn[1] == 0.125);
         assert(dn[2] == 0.175);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_init_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_init_func.pass.cpp
index 77371de45..ab29fecf6 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_init_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_init_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ double f(double x)
     return x*2;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -79,4 +78,6 @@ int main()
         assert(dn[1] == 0.125);
         assert(dn[2] == 0.175);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_iterator.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_iterator.pass.cpp
index 5fce58bbd..541976ad1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_iterator.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -98,4 +97,6 @@ int main()
         assert(dn[2] == 1/4.5);
         assert(dn[3] == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_param.pass.cpp
index 7dc47b4a3..1ecbe87c2 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -39,4 +38,6 @@ int main()
         assert(dn[2] == 12.5/256.25);
         assert(dn[3] == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eq.pass.cpp
index 766989c58..19eda7357 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -44,4 +43,6 @@ int main()
         D d2;
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp
index d97898e5f..6476f3567 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -355,7 +354,7 @@ test6()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
@@ -363,4 +362,6 @@ int main()
     test4();
     test5();
     test6();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp
index f455dcff9..621320ca4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -38,7 +37,7 @@ f(double x, double a, double m, double b, double c)
     return a + m*(sqr(x) - sqr(b))/2 + c*(x-b);
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -91,4 +90,6 @@ int main()
             assert(std::abs(f(u[i], a, m, bk, c) - double(i)/N) < .001);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
index 57a8ca558..7776330c0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         D d(pa);
         assert(d.param() == pa);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp
index 1be2791fa..258fdb77b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -41,4 +40,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp
index 3dc12b692..ea6530eae 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         D d(b, b+Np, p);
         assert(d.max() == 17);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp
index 4d4a7603a..80c77d6e3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         D d(b, b+Np, p);
         assert(d.min() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp
index 055b2f58e..145e61630 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -31,4 +30,6 @@ int main()
         p1 = p0;
         assert(p1 == p0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp
index 87d94940a..b409f58f0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -30,4 +29,6 @@ int main()
         P p1 = p0;
         assert(p1 == p0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_default.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_default.pass.cpp
index 0bdf2c337..69d4d71f4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_default.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -32,4 +31,6 @@ int main()
         assert(dn[0] == 1);
         assert(dn[1] == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_func.pass.cpp
index 27e93ab61..c6ea33b1f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ double fw(double x)
     return 2*x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -67,4 +66,6 @@ int main()
         assert(dn[1] == 0.125);
         assert(dn[2] == 0.175);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_init_func.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_init_func.pass.cpp
index 518a4f265..3972715d0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_init_func.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_init_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ double f(double x)
     return x*2;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -80,4 +79,6 @@ int main()
         assert(dn[1] == 0.125);
         assert(dn[2] == 0.175);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_iterator.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_iterator.pass.cpp
index 117a5ef93..4a51902a0 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_iterator.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_ctor_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -102,4 +101,6 @@ int main()
         assert(dn[2] == 1/4.5);
         assert(dn[3] == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_eq.pass.cpp
index 1adffc8ca..e7a15d683 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         P p2(b, b+4, p);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_types.pass.cpp
index cea1e3dff..f6d65ddcc 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/set_param.pass.cpp
index e85a2f0ce..c5697d7ce 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         d.param(pa);
         assert(d.param() == pa);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/types.pass.cpp
index a34212987..9d8bdf6fc 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::piecewise_linear_distribution<> D;
@@ -29,4 +28,6 @@ int main()
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/assign.pass.cpp
index 0e04ea455..e34abf088 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/copy.pass.cpp
index c09830c62..796aebacc 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_int_int.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_int_int.pass.cpp
index 68f2ec097..8a4fd3358 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_int_int.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_int_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         assert(d.a() == -6);
         assert(d.b() == 106);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_param.pass.cpp
index cc3e86a42..2546810ec 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.a() == 3);
         assert(d.b() == 8);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eq.pass.cpp
index b7a5cffbe..47e1c8953 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(3, 9);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp
index 1be34f615..a4e769bd7 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -453,4 +452,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval_param.pass.cpp
index bb5a59d4f..77257a865 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -73,4 +72,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/get_param.pass.cpp
index ab8fa6c98..62d144fe5 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/io.pass.cpp
index 0220a5aa9..3e0296965 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/max.pass.cpp
index c0a262f8a..58ac8571f 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
         D d(3, 8);
         assert(d.max() == 8);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/min.pass.cpp
index 3a0d3b2d9..18b9b5045 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
         D d(3, 8);
         assert(d.min() == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_assign.pass.cpp
index 09c560971..33d677a91 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<long> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.a() == 5);
         assert(p.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_copy.pass.cpp
index 1f01e9858..1eae36b96 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<long> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.a() == 5);
         assert(p.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_ctor.pass.cpp
index eba933c01..6fbf499ca 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<long> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.a() == 5);
         assert(p.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_eq.pass.cpp
index 5831f96b6..b58a96567 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<long> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(6, 10);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_types.pass.cpp
index 4022cfb61..b4844a64b 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<long> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/set_param.pass.cpp
index 823837ba6..59b7b0728 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/types.pass.cpp
index 65c01d037..60ff1cb33 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_int_distribution<long> D;
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, long>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/assign.pass.cpp
index 9651a2f05..e348c04ed 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/copy.pass.cpp
index 073c3a851..4fcc9efc3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@ test1()
     assert(d1 == d2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_int_int.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_int_int.pass.cpp
index 03abc5362..c252c5bbb 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_int_int.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_int_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         assert(d.a() == -6);
         assert(d.b() == 106);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_param.pass.cpp
index a6f4aff93..20df543ea 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/ctor_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         assert(d.a() == 3.5);
         assert(d.b() == 8);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eq.pass.cpp
index 5fcba4346..fb318626d 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -34,4 +33,6 @@ int main()
         D d2(3, 8.1);
         assert(d1 != d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval.pass.cpp
index 621fdc1bf..99fe1f825 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -472,4 +471,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval_param.pass.cpp
index 8a0622063..495f0e9c3 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/eval_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ sqr(T x)
     return x * x;
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -72,4 +71,6 @@ int main()
         assert(std::abs(skew - x_skew) < 0.01);
         assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/get_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/get_param.pass.cpp
index 0496d853e..b60375545 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/get_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/get_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -26,4 +25,6 @@ int main()
         D d(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/io.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/io.pass.cpp
index 17ff93889..1f6eb5806 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/io.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -38,4 +37,6 @@ int main()
         is >> d2;
         assert(d1 == d2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/max.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/max.pass.cpp
index 6baa6d81a..ea75181f8 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/max.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
         D d(3, 8);
         assert(d.max() == 8);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/min.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/min.pass.cpp
index 3974258c5..46455e8b4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/min.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
         D d(3, 8);
         assert(d.min() == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_assign.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_assign.pass.cpp
index 07497fef5..ab4d59693 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_assign.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<float> D;
@@ -29,4 +28,6 @@ int main()
         assert(p.a() == 5);
         assert(p.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_copy.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_copy.pass.cpp
index d64df7dac..24260405c 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_copy.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<float> D;
@@ -28,4 +27,6 @@ int main()
         assert(p.a() == 5);
         assert(p.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_ctor.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_ctor.pass.cpp
index 8f21ebfbd..15cad423e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_ctor.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<float> D;
@@ -41,4 +40,6 @@ int main()
         assert(p.a() == 5);
         assert(p.b() == 10);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_eq.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_eq.pass.cpp
index 62df68ca6..2127aebf4 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_eq.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <limits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<float> D;
@@ -34,4 +33,6 @@ int main()
         param_type p2(6, 10);
         assert(p1 != p2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_types.pass.cpp
index 27c0998be..d2677580e 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/param_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<float> D;
@@ -25,4 +24,6 @@ int main()
         typedef param_type::distribution_type distribution_type;
         static_assert((std::is_same<D, distribution_type>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/set_param.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/set_param.pass.cpp
index 1ff121def..f651d72d1 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/set_param.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/set_param.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<> D;
@@ -27,4 +26,6 @@ int main()
         d.param(p);
         assert(d.param() == p);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/types.pass.cpp b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/types.pass.cpp
index b0e792fdd..431b7374a 100644
--- a/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/types.pass.cpp
+++ b/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.real/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::uniform_real_distribution<float> D;
         typedef D::result_type result_type;
         static_assert((std::is_same<result_type, float>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.eng/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.eng/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/assign.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/assign.pass.cpp
index 1c3a0c14a..cfaad1a33 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,10 +48,12 @@ test()
     test1<T, M-1, M-1, M>();
 }
 
-int main()
+int main(int, char**)
 {
     test<unsigned short>();
     test<unsigned int>();
     test<unsigned long>();
     test<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/copy.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/copy.pass.cpp
index 641e5f479..355854234 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,10 +48,12 @@ test()
     test1<T, M-1, M-1, M>();
 }
 
-int main()
+int main(int, char**)
 {
     test<unsigned short>();
     test<unsigned int>();
     test<unsigned long>();
     test<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_result_type.pass.cpp
index 311b7cd8f..4f2da2f61 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -130,7 +129,7 @@ test4()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1<unsigned short>();
     test1<unsigned int>();
@@ -151,4 +150,6 @@ int main()
     test4<unsigned int>();
     test4<unsigned long>();
     test4<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_sseq.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_sseq.pass.cpp
index db7118f4a..7e82f6395 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/ctor_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         unsigned a[] = {3, 5, 7};
@@ -26,4 +25,6 @@ int main()
         std::linear_congruential_engine<unsigned, 5, 7, 11> e2(4);
         assert(e1 == e2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/default.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/default.pass.cpp
index 83ad55725..372d98a65 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/default.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,10 +46,12 @@ test()
     test1<T, M-1, M-1, M>();
 }
 
-int main()
+int main(int, char**)
 {
     test<unsigned short>();
     test<unsigned int>();
     test<unsigned long>();
     test<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/discard.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/discard.pass.cpp
index 0a36fcb71..dcbb3e065 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/discard.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/discard.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ other()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     rand0<unsigned int>();
     rand0<unsigned long>();
@@ -70,4 +69,6 @@ int main()
     other<unsigned int>();
     other<unsigned long>();
     other<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/eval.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/eval.pass.cpp
index 6d0057d59..3ee4d9113 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ Haldir()
     assert(e() == 217250280);
 }
 
-int main()
+int main(int, char**)
 {
     randu<unsigned int>();
     randu<unsigned long>();
@@ -84,4 +83,6 @@ int main()
     Haldir<unsigned int>();
     Haldir<unsigned long>();
     Haldir<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/io.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/io.pass.cpp
index 28ebdf23d..b12de7b01 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/io.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::linear_congruential_engine<unsigned, 48271, 0, 2147483647> E;
@@ -41,4 +40,6 @@ int main()
         is >> e2;
         assert(e1 == e2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/result_type.pass.cpp
index d261f1d93..e0bb2e02c 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,10 +27,12 @@ test()
         T>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<unsigned short>();
     test<unsigned int>();
     test<unsigned long>();
     test<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_result_type.pass.cpp
index 8156d63f0..3103bf7ef 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,10 +30,12 @@ test1()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1<unsigned short>();
     test1<unsigned int>();
     test1<unsigned long>();
     test1<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_sseq.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_sseq.pass.cpp
index ca2793c7f..e7725bd0b 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/seed_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         unsigned a[] = {3, 5, 7};
@@ -36,4 +35,6 @@ int main()
         E e2(sseq);
         assert(e1 == e2);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.lcong/values.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.lcong/values.pass.cpp
index 2c2abe6e9..a8c86bad3 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.lcong/values.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.lcong/values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -86,10 +85,12 @@ test()
     test1<T, M-1, M-1, M>();
 }
 
-int main()
+int main(int, char**)
 {
     test<unsigned short>();
     test<unsigned int>();
     test<unsigned long>();
     test<unsigned long long>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/assign.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/assign.pass.cpp
index 63d7168f5..3e1002b06 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,8 +50,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/copy.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/copy.pass.cpp
index a006b3324..b1273f1bb 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,8 +48,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp
index 6920aaca5..4eca3baad 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -238,8 +237,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq.pass.cpp
index 45bc493af..b46029a29 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -302,8 +301,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq_all_zero.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq_all_zero.pass.cpp
index 4599348f4..a2489cf63 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq_all_zero.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/ctor_sseq_all_zero.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,10 +71,12 @@ void test(void) {
   assert(e() == X0);
 }
 
-int main() {
+int main(int, char**) {
   // Test for k == 1: word_size <= 32.
   test<unsigned short, 3u>();
 
   // Test for k == 2: (32 < word_size <= 64).
   test<unsigned long long, 33u>();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/default.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/default.pass.cpp
index d92ffd807..35364f312 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/default.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,8 +37,10 @@ test2()
     assert(e1() == 14514284786278117030ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/discard.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/discard.pass.cpp
index 480260d8b..750afb1e8 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/discard.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/discard.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,8 +47,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/eval.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/eval.pass.cpp
index 0b17a8577..03e87dad8 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,8 +37,10 @@ test2()
     assert(e() == 13109570281517897720ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/io.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/io.pass.cpp
index 28e00ec1e..cbc764e8d 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/io.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,8 +61,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/result_type.pass.cpp
index 26f3e1563..7987d6574 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,8 +36,10 @@ test2()
         std::uint_fast64_t>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_result_type.pass.cpp
index 6f93e5beb..ff7d07374 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,8 +44,10 @@ test2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_sseq.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_sseq.pass.cpp
index 33292a041..8ad2ec289 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/seed_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,8 +42,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.mers/values.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.mers/values.pass.cpp
index 08d99b3d8..1af1d85b2 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.mers/values.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.mers/values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -127,8 +126,10 @@ test2()
     where(E::default_seed);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/assign.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/assign.pass.cpp
index 60fec4462..e6cce1b2d 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/assign.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,8 +48,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/copy.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/copy.pass.cpp
index 5944716b6..c39f39858 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/copy.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,8 +46,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp
index 429298dfc..5a178e82e 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,8 +43,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_sseq.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_sseq.pass.cpp
index 893f6dc34..0ed496e71 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/ctor_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,8 +47,10 @@ test2()
     assert(os.str() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/default.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/default.pass.cpp
index 56e8759d1..dbc4c5b4c 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/default.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,8 +34,10 @@ test2()
     assert(e1() == 23459059301164ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/discard.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/discard.pass.cpp
index ad33fc151..4d039289b 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/discard.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/discard.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,8 +44,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/eval.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/eval.pass.cpp
index 44829944b..d8d03c09e 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/eval.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/eval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,8 +34,10 @@ test2()
     assert(e() == 276846226770426ull);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/io.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/io.pass.cpp
index 834f5f69c..d3eeda3be 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/io.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,8 +55,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/result_type.pass.cpp
index 6af195b49..5312bb1ff 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,8 +34,10 @@ test2()
         std::uint_fast64_t>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_result_type.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_result_type.pass.cpp
index fa6e741da..637841a67 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_result_type.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_result_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,8 +42,10 @@ test2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_sseq.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_sseq.pass.cpp
index 347077278..85199c0ef 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_sseq.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/seed_sseq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,8 +40,10 @@ test2()
     assert(e1 == e2);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.eng/rand.eng.sub/values.pass.cpp b/test/std/numerics/rand/rand.eng/rand.eng.sub/values.pass.cpp
index 02f8b222d..a877eff13 100644
--- a/test/std/numerics/rand/rand.eng/rand.eng.sub/values.pass.cpp
+++ b/test/std/numerics/rand/rand.eng/rand.eng.sub/values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,8 +74,10 @@ test2()
     where(E::default_seed);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/default_random_engine.pass.cpp b/test/std/numerics/rand/rand.predef/default_random_engine.pass.cpp
index c6d24e633..b06cd4656 100644
--- a/test/std/numerics/rand/rand.predef/default_random_engine.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/default_random_engine.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::default_random_engine e;
     e.discard(9999);
     LIBCPP_ASSERT(e() == 399268537u);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/knuth_b.pass.cpp b/test/std/numerics/rand/rand.predef/knuth_b.pass.cpp
index 69627d79e..d81f788e5 100644
--- a/test/std/numerics/rand/rand.predef/knuth_b.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/knuth_b.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::knuth_b e;
     e.discard(9999);
     assert(e() == 1112339016u);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/minstd_rand.pass.cpp b/test/std/numerics/rand/rand.predef/minstd_rand.pass.cpp
index 891e5cce6..d38b009e5 100644
--- a/test/std/numerics/rand/rand.predef/minstd_rand.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/minstd_rand.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::minstd_rand e;
     e.discard(9999);
     assert(e() == 399268537u);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/minstd_rand0.pass.cpp b/test/std/numerics/rand/rand.predef/minstd_rand0.pass.cpp
index 63848cf95..4e4f07eae 100644
--- a/test/std/numerics/rand/rand.predef/minstd_rand0.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/minstd_rand0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::minstd_rand0 e;
     e.discard(9999);
     assert(e() == 1043618065u);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/mt19937.pass.cpp b/test/std/numerics/rand/rand.predef/mt19937.pass.cpp
index e3a79364a..16390964f 100644
--- a/test/std/numerics/rand/rand.predef/mt19937.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/mt19937.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::mt19937 e;
     e.discard(9999);
     assert(e() == 4123659995u);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/mt19937_64.pass.cpp b/test/std/numerics/rand/rand.predef/mt19937_64.pass.cpp
index 67896d226..c6a3b4ebd 100644
--- a/test/std/numerics/rand/rand.predef/mt19937_64.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/mt19937_64.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::mt19937_64 e;
     e.discard(9999);
     assert(e() == 9981545732273789042ull);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/ranlux24.pass.cpp b/test/std/numerics/rand/rand.predef/ranlux24.pass.cpp
index 529586af9..9805d1add 100644
--- a/test/std/numerics/rand/rand.predef/ranlux24.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/ranlux24.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ranlux24 e;
     e.discard(9999);
     assert(e() == 9901578u);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/ranlux24_base.pass.cpp b/test/std/numerics/rand/rand.predef/ranlux24_base.pass.cpp
index f7311469d..21c68699b 100644
--- a/test/std/numerics/rand/rand.predef/ranlux24_base.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/ranlux24_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ranlux24_base e;
     e.discard(9999);
     assert(e() == 7937952u);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/ranlux48.pass.cpp b/test/std/numerics/rand/rand.predef/ranlux48.pass.cpp
index f15dfd549..2ab37e1c7 100644
--- a/test/std/numerics/rand/rand.predef/ranlux48.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/ranlux48.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ranlux48 e;
     e.discard(9999);
     assert(e() == 249142670248501ull);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.predef/ranlux48_base.pass.cpp b/test/std/numerics/rand/rand.predef/ranlux48_base.pass.cpp
index 4c3df3e1d..93bb14c5c 100644
--- a/test/std/numerics/rand/rand.predef/ranlux48_base.pass.cpp
+++ b/test/std/numerics/rand/rand.predef/ranlux48_base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ranlux48_base e;
     e.discard(9999);
     assert(e() == 61839128582725ull);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.req/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.req/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.req/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.req/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.req/rand.req.adapt/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.req/rand.req.adapt/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.req/rand.req.adapt/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.req/rand.req.adapt/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.req/rand.req.dst/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.req/rand.req.dst/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.req/rand.req.dst/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.req/rand.req.dst/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.req/rand.req.eng/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.req/rand.req.eng/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.req/rand.req.eng/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.req/rand.req.eng/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.req/rand.req.genl/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.req/rand.req.genl/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.req/rand.req.genl/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.req/rand.req.genl/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.req/rand.req.seedseq/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.req/rand.req.seedseq/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.req/rand.req.seedseq/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.req/rand.req.seedseq/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.req/rand.req.urng/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.req/rand.req.urng/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.req/rand.req.urng/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.req/rand.req.urng/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/nothing_to_do.pass.cpp b/test/std/numerics/rand/rand.util/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/numerics/rand/rand.util/nothing_to_do.pass.cpp
+++ b/test/std/numerics/rand/rand.util/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp b/test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp
index df2acbe9e..a05c0846a 100644
--- a/test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "truncate_fp.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::minstd_rand0 E;
@@ -99,4 +98,6 @@ int main()
             (282475249 - E::min()) * (E::max() - E::min() + F(1))) /
             ((E::max() - E::min() + F(1)) * (E::max() - E::min() + F(1)))));
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.seedseq/assign.fail.cpp b/test/std/numerics/rand/rand.util/rand.util.seedseq/assign.fail.cpp
index 6b5d75042..de06a5e9b 100644
--- a/test/std/numerics/rand/rand.util/rand.util.seedseq/assign.fail.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.seedseq/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <random>
 
-int main()
+int main(int, char**)
 {
     std::seed_seq s0;
     std::seed_seq s;
     s = s0;
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.seedseq/copy.fail.cpp b/test/std/numerics/rand/rand.util/rand.util.seedseq/copy.fail.cpp
index cf260fcc0..7c3c38ea7 100644
--- a/test/std/numerics/rand/rand.util/rand.util.seedseq/copy.fail.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.seedseq/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <random>
 
-int main()
+int main(int, char**)
 {
     std::seed_seq s0;
     std::seed_seq s(s0);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.seedseq/default.pass.cpp b/test/std/numerics/rand/rand.util/rand.util.seedseq/default.pass.cpp
index bf4210aa9..87608e63c 100644
--- a/test/std/numerics/rand/rand.util/rand.util.seedseq/default.pass.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.seedseq/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::seed_seq s;
     assert(s.size() == 0);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.seedseq/generate.pass.cpp b/test/std/numerics/rand/rand.util/rand.util.seedseq/generate.pass.cpp
index 9712f61d6..e32877778 100644
--- a/test/std/numerics/rand/rand.util/rand.util.seedseq/generate.pass.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.seedseq/generate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         // These numbers generated from a slightly altered version of dSFMT
@@ -802,4 +801,6 @@ int main()
         for (int i = 0; i < n; ++i)
             assert(a[i] == b[i]);
     }
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.seedseq/initializer_list.pass.cpp b/test/std/numerics/rand/rand.util/rand.util.seedseq/initializer_list.pass.cpp
index c0921d913..656981b1a 100644
--- a/test/std/numerics/rand/rand.util/rand.util.seedseq/initializer_list.pass.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.seedseq/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::seed_seq s= {5, 4, 3, 2, 1};
     assert(s.size() == 5);
@@ -30,4 +29,6 @@ int main()
     assert(b[2] == 3);
     assert(b[3] == 2);
     assert(b[4] == 1);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp b/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp
index 2214dca8a..10f7b3472 100644
--- a/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.seedseq/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <random>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     unsigned a[5] = {5, 4, 3, 2, 1};
     std::seed_seq s(a, a+5);
@@ -29,4 +28,6 @@ int main()
     assert(b[2] == 3);
     assert(b[3] == 2);
     assert(b[4] == 1);
+
+  return 0;
 }
diff --git a/test/std/numerics/rand/rand.util/rand.util.seedseq/types.pass.cpp b/test/std/numerics/rand/rand.util/rand.util.seedseq/types.pass.cpp
index 430d9b781..50cfa7d59 100644
--- a/test/std/numerics/rand/rand.util/rand.util.seedseq/types.pass.cpp
+++ b/test/std/numerics/rand/rand.util/rand.util.seedseq/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <random>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::seed_seq::result_type, std::uint_least32_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/nothing_to_do.pass.cpp b/test/std/re/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/re/nothing_to_do.pass.cpp
+++ b/test/std/re/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/nothing_to_do.pass.cpp b/test/std/re/re.alg/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/re/re.alg/nothing_to_do.pass.cpp
+++ b/test/std/re/re.alg/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/awk.pass.cpp b/test/std/re/re.alg/re.alg.match/awk.pass.cpp
index 4fc1ea7fe..43fc9b89c 100644
--- a/test/std/re/re.alg/re.alg.match/awk.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/awk.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,10 @@
 //                    regex_constants::match_flag_type flags
 //                                            = regex_constants::match_default);
 
+// TODO: investigation needed
+// TODO(netbsd): incomplete support for locales
+// XFAIL: linux-gnu, netbsd
+
 #include <regex>
 #include <cassert>
 #include "test_macros.h"
@@ -24,9 +27,8 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
-#if 0
     {
         std::cmatch m;
         const char s[] = "a";
@@ -1389,5 +1391,5 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
-#endif
+    return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/basic.fail.cpp b/test/std/re/re.alg/re.alg.match/basic.fail.cpp
index 04ce8fdd2..d71fc280a 100644
--- a/test/std/re/re.alg/re.alg.match/basic.fail.cpp
+++ b/test/std/re/re.alg/re.alg.match/basic.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@
 #error
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::smatch m;
         std::regex re{"*"};
         std::regex_match(std::string("abcde"), m, re);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/basic.pass.cpp b/test/std/re/re.alg/re.alg.match/basic.pass.cpp
index 5140ec917..b2fa6e941 100644
--- a/test/std/re/re.alg/re.alg.match/basic.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/basic.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -1368,4 +1367,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/ecma.pass.cpp b/test/std/re/re.alg/re.alg.match/ecma.pass.cpp
index a676e9e52..e15533da6 100644
--- a/test/std/re/re.alg/re.alg.match/ecma.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/ecma.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -1392,4 +1391,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/egrep.pass.cpp b/test/std/re/re.alg/re.alg.match/egrep.pass.cpp
index 53cff850e..4e1b6940c 100644
--- a/test/std/re/re.alg/re.alg.match/egrep.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/egrep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -79,4 +78,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == "tourna");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/exponential.pass.cpp b/test/std/re/re.alg/re.alg.match/exponential.pass.cpp
index f7a6f91ef..a1ba80f26 100644
--- a/test/std/re/re.alg/re.alg.match/exponential.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/exponential.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,18 +21,20 @@
 
 #include <regex>
 #include <cassert>
+#include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   for (std::regex_constants::syntax_option_type op :
        {std::regex::ECMAScript, std::regex::extended, std::regex::egrep,
         std::regex::awk}) {
     try {
-      std::regex_match(
+      bool b = std::regex_match(
           "aaaaaaaaaaaaaaaaaaaa",
           std::regex(
               "a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?aaaaaaaaaaaaaaaaaaaa",
               op));
-      assert(false);
+      LIBCPP_ASSERT(false);
+      assert(b);
     } catch (const std::regex_error &e) {
       assert(e.code() == std::regex_constants::error_complexity);
     }
diff --git a/test/std/re/re.alg/re.alg.match/extended.pass.cpp b/test/std/re/re.alg/re.alg.match/extended.pass.cpp
index 8aa71f75d..9415505fa 100644
--- a/test/std/re/re.alg/re.alg.match/extended.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/extended.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -1364,4 +1363,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/grep.pass.cpp b/test/std/re/re.alg/re.alg.match/grep.pass.cpp
index efd33cb11..0f75d618c 100644
--- a/test/std/re/re.alg/re.alg.match/grep.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/grep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -47,4 +46,6 @@ int main()
                 std::regex_constants::grep)));
         assert(m.size() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/inverted_character_classes.pass.cpp b/test/std/re/re.alg/re.alg.match/inverted_character_classes.pass.cpp
index 5a19edc1a..d48d86ee6 100644
--- a/test/std/re/re.alg/re.alg.match/inverted_character_classes.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/inverted_character_classes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <regex>
 
 
-int main() {
+int main(int, char**) {
     assert(std::regex_match("X", std::regex("[X]")));
     assert(std::regex_match("X", std::regex("[XY]")));
     assert(!std::regex_match("X", std::regex("[^X]")));
@@ -41,4 +40,6 @@ int main() {
     assert(!std::regex_match("_", std::regex("[\\W]")));
     assert(std::regex_match("X", std::regex("[^\\W]")));
     assert(std::regex_match("_", std::regex("[^\\W]")));
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/lookahead_capture.pass.cpp b/test/std/re/re.alg/re.alg.match/lookahead_capture.pass.cpp
index 95f400ce8..1550f3728 100644
--- a/test/std/re/re.alg/re.alg.match/lookahead_capture.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/lookahead_capture.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex re("^(?=(.))a$");
@@ -96,4 +95,6 @@ int main()
         assert(m[3] == "a");
         assert(m[4] == "");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.match/parse_curly_brackets.pass.cpp b/test/std/re/re.alg/re.alg.match/parse_curly_brackets.pass.cpp
index d9c517230..291798cfc 100644
--- a/test/std/re/re.alg/re.alg.match/parse_curly_brackets.pass.cpp
+++ b/test/std/re/re.alg/re.alg.match/parse_curly_brackets.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,11 +62,12 @@ test4()
     assert((std::regex_match(target, smatch, regex)));
 }
 
-int
-main()
+int main(int, char**)
 {
     test1();
     test2();
     test3();
     test4();
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.replace/exponential.pass.cpp b/test/std/re/re.alg/re.alg.replace/exponential.pass.cpp
new file mode 100644
index 000000000..868c3d835
--- /dev/null
+++ b/test/std/re/re.alg/re.alg.replace/exponential.pass.cpp
@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <regex>
+// UNSUPPORTED: libcpp-no-exceptions
+
+// template <class OutputIterator, class BidirectionalIterator,
+//           class traits, class charT, class ST, class SA>
+//     OutputIterator
+//     regex_replace(OutputIterator out,
+//                   BidirectionalIterator first, BidirectionalIterator last,
+//                   const basic_regex<charT, traits>& e,
+//                   const basic_string<charT, ST, SA>& fmt,
+//                   regex_constants::match_flag_type flags =
+//                                              regex_constants::match_default);
+
+#include <regex>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    try {
+        std::regex re("a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?aaaaaaaaaaaaaaaaaaaa");
+        const char s[] = "aaaaaaaaaaaaaaaaaaaa";
+        std::string r = std::regex_replace(s, re, "123-&", std::regex_constants::format_sed);
+        LIBCPP_ASSERT(false);
+        assert(r == "123-aaaaaaaaaaaaaaaaaaaa");
+    } catch (const std::regex_error &e) {
+      assert(e.code() == std::regex_constants::error_complexity);
+    }
+    return 0;
+}
diff --git a/test/std/re/re.alg/re.alg.replace/test1.pass.cpp b/test/std/re/re.alg/re.alg.replace/test1.pass.cpp
index 13cc8f2a0..7e5332aaf 100644
--- a/test/std/re/re.alg/re.alg.replace/test1.pass.cpp
+++ b/test/std/re/re.alg/re.alg.replace/test1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -105,4 +104,6 @@ int main()
         assert(r.base() == buf+12);
         assert(buf == std::string("123-555-1234"));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.replace/test2.pass.cpp b/test/std/re/re.alg/re.alg.replace/test2.pass.cpp
index 679644f09..d5e3b64a3 100644
--- a/test/std/re/re.alg/re.alg.replace/test2.pass.cpp
+++ b/test/std/re/re.alg/re.alg.replace/test2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -105,4 +104,6 @@ int main()
         assert(r.base() == buf+12);
         assert(buf == std::string("123-555-1234"));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.replace/test3.pass.cpp b/test/std/re/re.alg/re.alg.replace/test3.pass.cpp
index c8b8c649d..09ecc53a9 100644
--- a/test/std/re/re.alg/re.alg.replace/test3.pass.cpp
+++ b/test/std/re/re.alg/re.alg.replace/test3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -71,4 +70,6 @@ int main()
                                            std::regex_constants::format_no_copy);
         assert(r == "123-555-1234");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.replace/test4.pass.cpp b/test/std/re/re.alg/re.alg.replace/test4.pass.cpp
index 251eae8f6..4d567ed1f 100644
--- a/test/std/re/re.alg/re.alg.replace/test4.pass.cpp
+++ b/test/std/re/re.alg/re.alg.replace/test4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -70,4 +69,6 @@ int main()
                                            std::regex_constants::format_no_copy);
         assert(r == "123-555-1234");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.replace/test5.pass.cpp b/test/std/re/re.alg/re.alg.replace/test5.pass.cpp
index 53720d6f7..585a60f87 100644
--- a/test/std/re/re.alg/re.alg.replace/test5.pass.cpp
+++ b/test/std/re/re.alg/re.alg.replace/test5.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -71,4 +70,6 @@ int main()
                                            std::regex_constants::format_no_copy);
         assert(r == "123-555-1234");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.replace/test6.pass.cpp b/test/std/re/re.alg/re.alg.replace/test6.pass.cpp
index a00ac7519..66a910172 100644
--- a/test/std/re/re.alg/re.alg.replace/test6.pass.cpp
+++ b/test/std/re/re.alg/re.alg.replace/test6.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -71,4 +70,6 @@ int main()
                                            std::regex_constants::format_no_copy);
         assert(r == "123-555-1234");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/awk.pass.cpp b/test/std/re/re.alg/re.alg.search/awk.pass.cpp
index 85f38ec63..0f8fb14f5 100644
--- a/test/std/re/re.alg/re.alg.search/awk.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/awk.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -1575,4 +1574,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/backup.pass.cpp b/test/std/re/re.alg/re.alg.search/backup.pass.cpp
index 8de0b650f..d27124a8d 100644
--- a/test/std/re/re.alg/re.alg.search/backup.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/backup.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     // This regex_iterator uses regex_search(__wrap_iter<_Iter> __first, ...)
     // Test for https://bugs.llvm.org/show_bug.cgi?id=16240 fixed in r185273.
@@ -61,4 +60,6 @@ int main()
         ++it;
         assert(it == end);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/basic.fail.cpp b/test/std/re/re.alg/re.alg.search/basic.fail.cpp
index 430b0a3aa..fb9677f7e 100644
--- a/test/std/re/re.alg/re.alg.search/basic.fail.cpp
+++ b/test/std/re/re.alg/re.alg.search/basic.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@
 #error
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::smatch m;
         std::regex re{"*"};
         std::regex_search(std::string("abcde"), m, re);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/basic.pass.cpp b/test/std/re/re.alg/re.alg.search/basic.pass.cpp
index 82f051a07..bd96c9830 100644
--- a/test/std/re/re.alg/re.alg.search/basic.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/basic.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -1548,4 +1547,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/ecma.pass.cpp b/test/std/re/re.alg/re.alg.search/ecma.pass.cpp
index a8ae1f550..7e74caa08 100644
--- a/test/std/re/re.alg/re.alg.search/ecma.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/ecma.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -1590,4 +1589,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/egrep.pass.cpp b/test/std/re/re.alg/re.alg.search/egrep.pass.cpp
index 0bf838611..df8560f5f 100644
--- a/test/std/re/re.alg/re.alg.search/egrep.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/egrep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -88,4 +87,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == "tourna");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/exponential.pass.cpp b/test/std/re/re.alg/re.alg.search/exponential.pass.cpp
index e22aa358b..a9eb2b2b9 100644
--- a/test/std/re/re.alg/re.alg.search/exponential.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/exponential.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,18 +21,20 @@
 
 #include <regex>
 #include <cassert>
+#include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   for (std::regex_constants::syntax_option_type op :
        {std::regex::ECMAScript, std::regex::extended, std::regex::egrep,
         std::regex::awk}) {
     try {
-      std::regex_search(
+      bool b = std::regex_search(
           "aaaaaaaaaaaaaaaaaaaa",
           std::regex(
               "a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?aaaaaaaaaaaaaaaaaaaa",
               op));
-      assert(false);
+      LIBCPP_ASSERT(false);
+      assert(b);
     } catch (const std::regex_error &e) {
       assert(e.code() == std::regex_constants::error_complexity);
     }
diff --git a/test/std/re/re.alg/re.alg.search/extended.pass.cpp b/test/std/re/re.alg/re.alg.search/extended.pass.cpp
index 6d95ad275..62e4822db 100644
--- a/test/std/re/re.alg/re.alg.search/extended.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/extended.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -1544,4 +1543,6 @@ int main()
         assert(m.position(0) == 0);
         assert(m.str(0) == s);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/grep.pass.cpp b/test/std/re/re.alg/re.alg.search/grep.pass.cpp
index 0040f7bfa..29300a818 100644
--- a/test/std/re/re.alg/re.alg.search/grep.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/grep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ void fuzz_tests()  // patterns that the fuzzer has found
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::cmatch m;
@@ -86,4 +85,6 @@ int main()
         assert(m.str(0) == "");
     }
     fuzz_tests();
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/invert_neg_word_search.pass.cpp b/test/std/re/re.alg/re.alg.search/invert_neg_word_search.pass.cpp
index dc0b98558..63fd5ae57 100644
--- a/test/std/re/re.alg/re.alg.search/invert_neg_word_search.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/invert_neg_word_search.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 
 // PR34310
-int main()
+int main(int, char**)
 {
   assert(std::regex_search("HelloWorld", std::regex("[^\\W]")));
   assert(std::regex_search("_", std::regex("[^\\W]")));
diff --git a/test/std/re/re.alg/re.alg.search/lookahead.pass.cpp b/test/std/re/re.alg/re.alg.search/lookahead.pass.cpp
index 2d753ed14..7846eca2a 100644
--- a/test/std/re/re.alg/re.alg.search/lookahead.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/lookahead.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(!std::regex_search("ab", std::regex("(?=^)b")));
     assert(!std::regex_search("ab", std::regex("a(?=^)b")));
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.alg.search/no_update_pos.pass.cpp b/test/std/re/re.alg/re.alg.search/no_update_pos.pass.cpp
index 600425d8d..73158dc53 100644
--- a/test/std/re/re.alg/re.alg.search/no_update_pos.pass.cpp
+++ b/test/std/re/re.alg/re.alg.search/no_update_pos.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     // Iterating over /^a/ should yield one instance at the beginning
     // of the text.
@@ -36,4 +35,6 @@ int main()
 
     ++it;
     assert(it == end);
+
+  return 0;
 }
diff --git a/test/std/re/re.alg/re.except/nothing_to_do.pass.cpp b/test/std/re/re.alg/re.except/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/re/re.alg/re.except/nothing_to_do.pass.cpp
+++ b/test/std/re/re.alg/re.except/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.badexp/regex_error.pass.cpp b/test/std/re/re.badexp/regex_error.pass.cpp
index f1752716e..a3f4476b0 100644
--- a/test/std/re/re.badexp/regex_error.pass.cpp
+++ b/test/std/re/re.badexp/regex_error.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_error e(std::regex_constants::error_collate);
@@ -94,4 +93,6 @@ int main()
         assert(e.what() == std::string("There was insufficient memory to determine whether the regular "
                "expression could match the specified character sequence."));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.const/nothing_to_do.pass.cpp b/test/std/re/re.const/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.const/nothing_to_do.pass.cpp
+++ b/test/std/re/re.const/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.const/re.err/error_type.pass.cpp b/test/std/re/re.const/re.err/error_type.pass.cpp
index 3609d41b9..51979a511 100644
--- a/test/std/re/re.const/re.err/error_type.pass.cpp
+++ b/test/std/re/re.const/re.err/error_type.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::regex_constants::error_collate != 0);
     assert(std::regex_constants::error_ctype != 0);
@@ -141,4 +140,6 @@ int main()
     assert(std::regex_constants::error_badrepeat != std::regex_constants::error_stack);
 
     assert(std::regex_constants::error_complexity != std::regex_constants::error_stack);
+
+  return 0;
 }
diff --git a/test/std/re/re.const/re.matchflag/match_flag_type.pass.cpp b/test/std/re/re.const/re.matchflag/match_flag_type.pass.cpp
index c7b2a80cd..812601463 100644
--- a/test/std/re/re.const/re.matchflag/match_flag_type.pass.cpp
+++ b/test/std/re/re.const/re.matchflag/match_flag_type.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::regex_constants::match_default == 0);
     assert(std::regex_constants::match_not_bol != 0);
@@ -126,4 +125,6 @@ int main()
     e1 &= e2;
     e1 |= e2;
     e1 ^= e2;
+
+  return 0;
 }
diff --git a/test/std/re/re.const/re.matchflag/match_not_bol.pass.cpp b/test/std/re/re.const/re.matchflag/match_not_bol.pass.cpp
index 03e8770dd..82395e2f2 100644
--- a/test/std/re/re.const/re.matchflag/match_not_bol.pass.cpp
+++ b/test/std/re/re.const/re.matchflag/match_not_bol.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string target = "foo";
@@ -48,4 +47,6 @@ int main()
     assert( std::regex_search(target, re));
     assert( std::regex_search(target, re, std::regex_constants::match_not_bol));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.const/re.matchflag/match_not_eol.pass.cpp b/test/std/re/re.const/re.matchflag/match_not_eol.pass.cpp
index 1c9b154f1..8b13c68bc 100644
--- a/test/std/re/re.const/re.matchflag/match_not_eol.pass.cpp
+++ b/test/std/re/re.const/re.matchflag/match_not_eol.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string target = "foo";
@@ -48,4 +47,6 @@ int main()
     assert( std::regex_search(target, re));
     assert( std::regex_search(target, re, std::regex_constants::match_not_eol));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.const/re.matchflag/match_not_null.pass.cpp b/test/std/re/re.const/re.matchflag/match_not_null.pass.cpp
index 41963fbb2..645f79a0d 100644
--- a/test/std/re/re.const/re.matchflag/match_not_null.pass.cpp
+++ b/test/std/re/re.const/re.matchflag/match_not_null.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <cassert>
 #include <regex>
 
-int main()
+int main(int, char**)
 {
   // When match_not_null is on, the regex engine should reject empty matches and
   // move on to try other solutions.
diff --git a/test/std/re/re.const/re.synopt/syntax_option_type.pass.cpp b/test/std/re/re.const/re.synopt/syntax_option_type.pass.cpp
index ad6111cc4..49ce2b5c4 100644
--- a/test/std/re/re.const/re.synopt/syntax_option_type.pass.cpp
+++ b/test/std/re/re.const/re.synopt/syntax_option_type.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::regex_constants::icase != 0);
     assert(std::regex_constants::nosubs != 0);
@@ -112,4 +111,6 @@ int main()
     e1 &= e2;
     e1 |= e2;
     e1 ^= e2;
+
+  return 0;
 }
diff --git a/test/std/re/re.def/defns.regex.collating.element/nothing_to_do.pass.cpp b/test/std/re/re.def/defns.regex.collating.element/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/defns.regex.collating.element/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/defns.regex.collating.element/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.def/defns.regex.finite.state.machine/nothing_to_do.pass.cpp b/test/std/re/re.def/defns.regex.finite.state.machine/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/defns.regex.finite.state.machine/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/defns.regex.finite.state.machine/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.def/defns.regex.format.specifier/nothing_to_do.pass.cpp b/test/std/re/re.def/defns.regex.format.specifier/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/defns.regex.format.specifier/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/defns.regex.format.specifier/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.def/defns.regex.matched/nothing_to_do.pass.cpp b/test/std/re/re.def/defns.regex.matched/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/defns.regex.matched/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/defns.regex.matched/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.def/defns.regex.primary.equivalence.class/nothing_to_do.pass.cpp b/test/std/re/re.def/defns.regex.primary.equivalence.class/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/defns.regex.primary.equivalence.class/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/defns.regex.primary.equivalence.class/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.def/defns.regex.regular.expression/nothing_to_do.pass.cpp b/test/std/re/re.def/defns.regex.regular.expression/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/defns.regex.regular.expression/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/defns.regex.regular.expression/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.def/defns.regex.subexpression/nothing_to_do.pass.cpp b/test/std/re/re.def/defns.regex.subexpression/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/defns.regex.subexpression/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/defns.regex.subexpression/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.def/nothing_to_do.pass.cpp b/test/std/re/re.def/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.def/nothing_to_do.pass.cpp
+++ b/test/std/re/re.def/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.general/nothing_to_do.pass.cpp b/test/std/re/re.general/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.general/nothing_to_do.pass.cpp
+++ b/test/std/re/re.general/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.grammar/excessive_brace_count.pass.cpp b/test/std/re/re.grammar/excessive_brace_count.pass.cpp
index c4dade7de..a5f28d2ee 100644
--- a/test/std/re/re.grammar/excessive_brace_count.pass.cpp
+++ b/test/std/re/re.grammar/excessive_brace_count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
   for (std::regex_constants::syntax_option_type op :
        {std::regex::basic, std::regex::grep}) {
     try {
diff --git a/test/std/re/re.grammar/nothing_to_do.pass.cpp b/test/std/re/re.grammar/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/re/re.grammar/nothing_to_do.pass.cpp
+++ b/test/std/re/re.grammar/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/nothing_to_do.pass.cpp b/test/std/re/re.iter/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/re/re.iter/nothing_to_do.pass.cpp
+++ b/test/std/re/re.iter/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.fail.cpp b/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.fail.cpp
index 24fb3787e..34d1ce6ed 100644
--- a/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.fail.cpp
+++ b/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #error
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         const char phone_book[] = "555-1234, 555-2345, 555-3456";
@@ -33,4 +32,6 @@ int main()
             std::begin(phone_book), std::end(phone_book),
             std::regex("\\d{3}-\\d{4}"));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.pass.cpp b/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.pass.cpp
index c1cabff39..a6d105974 100644
--- a/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.pass.cpp
+++ b/test/std/re/re.iter/re.regiter/re.regiter.cnstr/cnstr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -42,4 +41,6 @@ int main()
         ++i;
         assert(i == std::cregex_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.regiter/re.regiter.cnstr/default.pass.cpp b/test/std/re/re.iter/re.regiter/re.regiter.cnstr/default.pass.cpp
index cb44fb37b..75bd9cab5 100644
--- a/test/std/re/re.iter/re.regiter/re.regiter.cnstr/default.pass.cpp
+++ b/test/std/re/re.iter/re.regiter/re.regiter.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ test()
     assert(i1 == I());
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.regiter/re.regiter.comp/tested_elsewhere.pass.cpp b/test/std/re/re.iter/re.regiter/re.regiter.comp/tested_elsewhere.pass.cpp
index 16d1fa990..f7f71bc8b 100644
--- a/test/std/re/re.iter/re.regiter/re.regiter.comp/tested_elsewhere.pass.cpp
+++ b/test/std/re/re.iter/re.regiter/re.regiter.comp/tested_elsewhere.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,6 +13,8 @@
 // bool operator==(const regex_iterator& right) const;
 // bool operator!=(const regex_iterator& right) const;
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.regiter/re.regiter.deref/deref.pass.cpp b/test/std/re/re.iter/re.regiter/re.regiter.deref/deref.pass.cpp
index 800f56434..11b12b2ee 100644
--- a/test/std/re/re.iter/re.regiter/re.regiter.deref/deref.pass.cpp
+++ b/test/std/re/re.iter/re.regiter/re.regiter.deref/deref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -40,4 +39,6 @@ int main()
         ++i;
         assert(i == std::cregex_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.regiter/re.regiter.incr/post.pass.cpp b/test/std/re/re.iter/re.regiter/re.regiter.incr/post.pass.cpp
index f92fd8801..ad65f7c13 100644
--- a/test/std/re/re.iter/re.regiter/re.regiter.incr/post.pass.cpp
+++ b/test/std/re/re.iter/re.regiter/re.regiter.incr/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -113,4 +112,6 @@ int main()
         ++i;
         assert(i == e);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.regiter/types.pass.cpp b/test/std/re/re.iter/re.regiter/types.pass.cpp
index 5b79957be..b96fec78a 100644
--- a/test/std/re/re.iter/re.regiter/types.pass.cpp
+++ b/test/std/re/re.iter/re.regiter/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,8 +38,10 @@ test()
     static_assert((std::is_same<typename I::iterator_category, std::forward_iterator_tag>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.fail.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.fail.cpp
index 8f90b2390..a03fd52c0 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.fail.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 #error
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-(\\d{4})");
@@ -36,4 +35,6 @@ int main()
         std::cregex_token_iterator i(std::begin(phone_book), std::end(phone_book)-1,
                                      std::regex("\\d{3}-\\d{4}"), indices);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.pass.cpp
index 6d8c2f35e..254909a92 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-(\\d{4})");
@@ -62,4 +61,6 @@ int main()
         ++i;
         assert(i == std::cregex_token_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/default.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/default.pass.cpp
index e71f3a692..bb70095f1 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/default.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ test()
     assert(i1 == I());
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.fail.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.fail.cpp
index 9d538730e..b6913e6b3 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.fail.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #error
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-(\\d{4})");
@@ -33,4 +32,6 @@ int main()
         std::cregex_token_iterator i(std::begin(phone_book), std::end(phone_book)-1,
                                       std::regex("\\d{3}-\\d{4}"), {-1, 0, 1});
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.pass.cpp
index 849ec4ae5..322c2682d 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-(\\d{4})");
@@ -62,4 +61,6 @@ int main()
         ++i;
         assert(i == std::cregex_token_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.fail.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.fail.cpp
index f4601f3ed..3c39d4983 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.fail.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #error
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -32,4 +31,6 @@ int main()
         std::cregex_token_iterator i(std::begin(phone_book), std::end(phone_book)-1,
                                      std::regex("\\d{3}-\\d{4}"), -1);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.pass.cpp
index 37fe2d976..1e5ba2eca 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -73,4 +72,6 @@ int main()
         ++i;
         assert(i == std::cregex_token_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.fail.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.fail.cpp
index d5d5f4c63..9b07df9d1 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.fail.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #error
 #endif
 
-int main()
+int main(int, char**)
 {
     {
          std::regex phone_numbers("\\d{3}-(\\d{4})");
@@ -37,4 +36,6 @@ int main()
         std::cregex_token_iterator i(std::begin(phone_book), std::end(phone_book)-1,
                                      std::regex("\\d{3}-\\d{4}"), v);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.pass.cpp
index 473a706dd..1d77deb91 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.cnstr/vector.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-(\\d{4})");
@@ -126,4 +125,6 @@ int main()
         ++i;
         assert(i == std::cregex_token_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.comp/equal.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.comp/equal.pass.cpp
index 49d1b1b7e..1c6020103 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.comp/equal.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.comp/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -34,4 +33,6 @@ int main()
         assert(!(i2 == i));
         assert(i2 != i);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.deref/deref.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.deref/deref.pass.cpp
index 73ec62cfc..facd24367 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.deref/deref.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.deref/deref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -70,4 +69,6 @@ int main()
         ++i;
         assert(i == std::cregex_token_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/re.tokiter.incr/post.pass.cpp b/test/std/re/re.iter/re.tokiter/re.tokiter.incr/post.pass.cpp
index 7d55bc111..15f1bb7c8 100644
--- a/test/std/re/re.iter/re.tokiter/re.tokiter.incr/post.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/re.tokiter.incr/post.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex phone_numbers("\\d{3}-\\d{4}");
@@ -133,4 +132,6 @@ int main()
         i++;
         assert(i == std::cregex_token_iterator());
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.iter/re.tokiter/types.pass.cpp b/test/std/re/re.iter/re.tokiter/types.pass.cpp
index b7777fbee..73ad58f4e 100644
--- a/test/std/re/re.iter/re.tokiter/types.pass.cpp
+++ b/test/std/re/re.iter/re.tokiter/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,8 +38,10 @@ test()
     static_assert((std::is_same<typename I::iterator_category, std::forward_iterator_tag>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/assign.il.pass.cpp b/test/std/re/re.regex/re.regex.assign/assign.il.pass.cpp
index fcaee8c3d..532a72073 100644
--- a/test/std/re/re.regex/re.regex.assign/assign.il.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/assign.il.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r2;
     r2.assign({'(', 'a', '(', '[', 'b', 'c', ']', ')', ')'});
@@ -31,4 +30,6 @@ int main()
     r2.assign({'(', 'a', '(', '[', 'b', 'c', ']', ')', ')'}, std::regex::extended);
     assert(r2.flags() == std::regex::extended);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/assign.pass.cpp b/test/std/re/re.regex/re.regex.assign/assign.pass.cpp
index 12b23a9fa..c580ab96c 100644
--- a/test/std/re/re.regex/re.regex.assign/assign.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r1("(a([bc]))");
     std::regex r2;
@@ -35,4 +34,6 @@ int main()
     assert(r2.mark_count() == 2);
     assert(std::regex_search("ab", r2));
 #endif
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/assign_iter_iter_flag.pass.cpp b/test/std/re/re.regex/re.regex.assign/assign_iter_iter_flag.pass.cpp
index 7cd4845f3..dd32c9466 100644
--- a/test/std/re/re.regex/re.regex.assign/assign_iter_iter_flag.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/assign_iter_iter_flag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     typedef input_iterator<std::string::const_iterator> I;
     typedef forward_iterator<std::string::const_iterator> F;
@@ -44,4 +43,6 @@ int main()
     r2.assign(F(s4.begin()), F(s4.end()), std::regex::extended);
     assert(r2.flags() == std::regex::extended);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/assign_ptr_flag.pass.cpp b/test/std/re/re.regex/re.regex.assign/assign_ptr_flag.pass.cpp
index 33b9cad18..9445bbaf9 100644
--- a/test/std/re/re.regex/re.regex.assign/assign_ptr_flag.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/assign_ptr_flag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r2;
     r2.assign("(a([bc]))");
@@ -27,4 +26,6 @@ int main()
     r2.assign("(a([bc]))", std::regex::extended);
     assert(r2.flags() == std::regex::extended);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/assign_ptr_size_flag.pass.cpp b/test/std/re/re.regex/re.regex.assign/assign_ptr_size_flag.pass.cpp
index 7ec4f77a5..cdbdae430 100644
--- a/test/std/re/re.regex/re.regex.assign/assign_ptr_size_flag.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/assign_ptr_size_flag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r2;
     r2.assign("(a([bc]))", 9, std::regex::extended);
     assert(r2.flags() == std::regex::extended);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/assign_string_flag.pass.cpp b/test/std/re/re.regex/re.regex.assign/assign_string_flag.pass.cpp
index 247d27721..4b1bcef9a 100644
--- a/test/std/re/re.regex/re.regex.assign/assign_string_flag.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/assign_string_flag.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r2;
     r2.assign(std::string("(a([bc]))"));
@@ -29,4 +28,6 @@ int main()
     r2.assign(std::string("(a([bc]))"), std::regex::extended);
     assert(r2.flags() == std::regex::extended);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/copy.pass.cpp b/test/std/re/re.regex/re.regex.assign/copy.pass.cpp
index 3f212f772..1abb72151 100644
--- a/test/std/re/re.regex/re.regex.assign/copy.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r1("(a([bc]))");
     std::regex r2;
     r2 = r1;
     assert(r2.flags() == std::regex::ECMAScript);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/il.pass.cpp b/test/std/re/re.regex/re.regex.assign/il.pass.cpp
index a74d9cf6e..880fd5c79 100644
--- a/test/std/re/re.regex/re.regex.assign/il.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/il.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,10 +18,12 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r2;
     r2 = {'(', 'a', '(', '[', 'b', 'c', ']', ')', ')'};
     assert(r2.flags() == std::regex::ECMAScript);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/ptr.pass.cpp b/test/std/re/re.regex/re.regex.assign/ptr.pass.cpp
index d2af1f9b3..3791f8152 100644
--- a/test/std/re/re.regex/re.regex.assign/ptr.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r2;
     r2 = "(a([bc]))";
     assert(r2.flags() == std::regex::ECMAScript);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.assign/string.pass.cpp b/test/std/re/re.regex/re.regex.assign/string.pass.cpp
index 65cc4a345..e33819ab3 100644
--- a/test/std/re/re.regex/re.regex.assign/string.pass.cpp
+++ b/test/std/re/re.regex/re.regex.assign/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,10 +17,12 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r2;
     r2 = std::string("(a([bc]))");
     assert(r2.flags() == std::regex::ECMAScript);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.const/constants.pass.cpp b/test/std/re/re.regex/re.regex.const/constants.pass.cpp
index 42bc526ae..5d8d48d05 100644
--- a/test/std/re/re.regex/re.regex.const/constants.pass.cpp
+++ b/test/std/re/re.regex/re.regex.const/constants.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,8 +58,10 @@ test()
     where(BR::egrep);
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/awk_oct.pass.cpp b/test/std/re/re.regex/re.regex.construct/awk_oct.pass.cpp
index 3f1eaf6b9..2e7eed350 100644
--- a/test/std/re/re.regex/re.regex.construct/awk_oct.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/awk_oct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using std::regex_constants::awk;
 
@@ -26,4 +25,6 @@ int main()
     assert(std::regex_match("\41", std::regex("\\41", awk)));
     assert(std::regex_match("\141", std::regex("\\141", awk)));
     assert(std::regex_match("\141" "1", std::regex("\\1411", awk)));
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp b/test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp
index 8e886cd8d..0a15b6453 100644
--- a/test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/bad_backref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ static bool error_badbackref_thrown(const char *pat)
     return result;
 }
 
-int main()
+int main(int, char**)
 {
     assert(error_badbackref_thrown("\\1abc"));      // no references
     assert(error_badbackref_thrown("ab(c)\\2def")); // only one reference
@@ -42,4 +41,6 @@ int main()
     const char *pat1 = "a(b)c\\1234";
     std::regex re(pat1, pat1 + 7); // extra chars after the end.
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/bad_ctype.pass.cpp b/test/std/re/re.regex/re.regex.construct/bad_ctype.pass.cpp
index aa70258db..5752d5cd6 100644
--- a/test/std/re/re.regex/re.regex.construct/bad_ctype.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/bad_ctype.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,8 +29,10 @@ static bool error_ctype_thrown(const char *pat)
     return result;
 }
 
-int main()
+int main(int, char**)
 {
     assert(error_ctype_thrown("[[::]]"));
     assert(error_ctype_thrown("[[:error:]]"));
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp b/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
index 93b21ec9e..041d55bdf 100644
--- a/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ static bool error_escape_thrown(const char *pat)
     return result;
 }
 
-int main()
+int main(int, char**)
 {
     assert(error_escape_thrown("[\\a]"));
     assert(error_escape_thrown("\\a"));
@@ -45,4 +44,6 @@ int main()
     assert(!error_escape_thrown("[\\cA]"));
     assert(!error_escape_thrown("\\cA"));
 
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/bad_repeat.pass.cpp b/test/std/re/re.regex/re.regex.construct/bad_repeat.pass.cpp
index 0f30a8b20..1af8b5ba6 100644
--- a/test/std/re/re.regex/re.regex.construct/bad_repeat.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/bad_repeat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ static bool error_badrepeat_thrown(const char *pat)
     return result;
 }
 
-int main()
+int main(int, char**)
 {
     assert(error_badrepeat_thrown("?a"));
     assert(error_badrepeat_thrown("*a"));
@@ -41,4 +40,6 @@ int main()
     assert(error_badrepeat_thrown("*(a+)"));
     assert(error_badrepeat_thrown("+(a+)"));
     assert(error_badrepeat_thrown("{(a+)"));
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/copy.pass.cpp b/test/std/re/re.regex/re.regex.construct/copy.pass.cpp
index a266289c6..f3db8fe06 100644
--- a/test/std/re/re.regex/re.regex.construct/copy.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r1("(a([bc]))");
     std::regex r2 = r1;
     assert(r2.flags() == std::regex::ECMAScript);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/deduct.fail.cpp b/test/std/re/re.regex/re.regex.construct/deduct.fail.cpp
index d4dc9e54f..30ec49c83 100644
--- a/test/std/re/re.regex/re.regex.construct/deduct.fail.cpp
+++ b/test/std/re/re.regex/re.regex.construct/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include <cstddef>
 
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
     {
@@ -42,4 +41,6 @@ int main()
 
 //  Test the implicit deduction guides
 
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/deduct.pass.cpp b/test/std/re/re.regex/re.regex.construct/deduct.pass.cpp
index 31f047c71..47e5a1dba 100644
--- a/test/std/re/re.regex/re.regex.construct/deduct.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ using namespace std::literals;
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 
 //  Test the explicit deduction guides
@@ -134,4 +133,6 @@ int main()
     assert(re.flags() == std::regex_constants::grep);
     assert(re.mark_count() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/default.pass.cpp b/test/std/re/re.regex/re.regex.construct/default.pass.cpp
index f1d7bf769..f706229e6 100644
--- a/test/std/re/re.regex/re.regex.construct/default.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,8 +25,10 @@ test()
     assert(r.mark_count() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/il_flg.pass.cpp b/test/std/re/re.regex/re.regex.construct/il_flg.pass.cpp
index 87dcc8569..aaf5bc25a 100644
--- a/test/std/re/re.regex/re.regex.construct/il_flg.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/il_flg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(std::initializer_list<char> il, std::regex_constants::syntax_option_type f,
 }
 
 
-int main()
+int main(int, char**)
 {
     std::string s1("\\(a\\)");
     std::string s2("\\(a[bc]\\)");
@@ -66,4 +65,6 @@ int main()
     test({'\\', '(', 'a', '[', 'b', 'c', ']', '\\', ')'}, std::regex_constants::egrep, 0);
     test({'\\', '(', 'a', '\\', '(', '[', 'b', 'c', ']', '\\', ')', '\\', ')'}, std::regex_constants::egrep, 0);
     test({'(', 'a', '(', '[', 'b', 'c', ']', ')', ')'}, std::regex_constants::egrep, 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/iter_iter.pass.cpp b/test/std/re/re.regex/re.regex.construct/iter_iter.pass.cpp
index 4a93d173e..3dcf29fa0 100644
--- a/test/std/re/re.regex/re.regex.construct/iter_iter.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(Iter first, Iter last, unsigned mc)
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     typedef forward_iterator<std::string::const_iterator> F;
     std::string s1("\\(a\\)");
@@ -41,4 +40,6 @@ int main()
     test(F(s2.begin()), F(s2.end()), 0);
     test(F(s3.begin()), F(s3.end()), 0);
     test(F(s4.begin()), F(s4.end()), 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/iter_iter_flg.pass.cpp b/test/std/re/re.regex/re.regex.construct/iter_iter_flg.pass.cpp
index 347989c5d..22423c092 100644
--- a/test/std/re/re.regex/re.regex.construct/iter_iter_flg.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/iter_iter_flg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(Iter first, Iter last, std::regex_constants::syntax_option_type f, unsigned
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     typedef forward_iterator<std::string::const_iterator> F;
     std::string s1("\\(a\\)");
@@ -67,4 +66,6 @@ int main()
     test(F(s2.begin()), F(s2.end()), std::regex_constants::egrep, 0);
     test(F(s3.begin()), F(s3.end()), std::regex_constants::egrep, 0);
     test(F(s4.begin()), F(s4.end()), std::regex_constants::egrep, 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/ptr.pass.cpp b/test/std/re/re.regex/re.regex.construct/ptr.pass.cpp
index 05fba0205..b71d9eb7f 100644
--- a/test/std/re/re.regex/re.regex.construct/ptr.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,10 +25,12 @@ test(const CharT* p, unsigned mc)
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     test("\\(a\\)", 0);
     test("\\(a[bc]\\)", 0);
     test("\\(a\\([bc]\\)\\)", 0);
     test("(a([bc]))", 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/ptr_flg.pass.cpp b/test/std/re/re.regex/re.regex.construct/ptr_flg.pass.cpp
index d37b81592..e918b0311 100644
--- a/test/std/re/re.regex/re.regex.construct/ptr_flg.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/ptr_flg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const CharT* p, std::regex_constants::syntax_option_type f, unsigned mc)
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     test("\\(a\\)", std::regex_constants::basic, 1);
     test("\\(a[bc]\\)", std::regex_constants::basic, 1);
@@ -57,4 +56,6 @@ int main()
     test("\\(a[bc]\\)", std::regex_constants::egrep, 0);
     test("\\(a\\([bc]\\)\\)", std::regex_constants::egrep, 0);
     test("(a([bc]))", std::regex_constants::egrep, 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/ptr_size.pass.cpp b/test/std/re/re.regex/re.regex.construct/ptr_size.pass.cpp
index 90a091a21..29fa3ca57 100644
--- a/test/std/re/re.regex/re.regex.construct/ptr_size.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/ptr_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const CharT* p, std::size_t len, unsigned mc)
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     test("\\(a\\)", 5, 0);
     test("\\(a[bc]\\)", 9, 0);
@@ -36,4 +35,6 @@ int main()
     test("(\0)(b)(c)(d)", 9, 3);
     test("(\0)(b)(c)(d)", 3, 1);
     test("(\0)(b)(c)(d)", 0, 0);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/ptr_size_flg.pass.cpp b/test/std/re/re.regex/re.regex.construct/ptr_size_flg.pass.cpp
index a0ceb7051..07f394731 100644
--- a/test/std/re/re.regex/re.regex.construct/ptr_size_flg.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/ptr_size_flg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const CharT* p, std::size_t len, std::regex_constants::syntax_option_type f
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     test("\\(a\\)", 5, std::regex_constants::basic, 1);
     test("\\(a[bc]\\)", 9, std::regex_constants::basic, 1);
@@ -58,4 +57,6 @@ int main()
     test("\\(a[bc]\\)", 9, std::regex_constants::egrep, 0);
     test("\\(a\\([bc]\\)\\)", 13, std::regex_constants::egrep, 0);
     test("(a([bc]))", 9, std::regex_constants::egrep, 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/string.pass.cpp b/test/std/re/re.regex/re.regex.construct/string.pass.cpp
index a8f2e9bf6..ecd0451d8 100644
--- a/test/std/re/re.regex/re.regex.construct/string.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,10 +26,12 @@ test(const String& p, unsigned mc)
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::string("\\(a\\)"), 0);
     test(std::string("\\(a[bc]\\)"), 0);
     test(std::string("\\(a\\([bc]\\)\\)"), 0);
     test(std::string("(a([bc]))"), 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.construct/string_flg.pass.cpp b/test/std/re/re.regex/re.regex.construct/string_flg.pass.cpp
index 5f87af102..b6bd8c53c 100644
--- a/test/std/re/re.regex/re.regex.construct/string_flg.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/string_flg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(const String& p, std::regex_constants::syntax_option_type f, unsigned mc)
     assert(r.mark_count() == mc);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::string("\\(a\\)"), std::regex_constants::basic, 1);
     test(std::string("\\(a[bc]\\)"), std::regex_constants::basic, 1);
@@ -59,4 +58,6 @@ int main()
     test(std::string("\\(a[bc]\\)"), std::regex_constants::egrep, 0);
     test(std::string("\\(a\\([bc]\\)\\)"), std::regex_constants::egrep, 0);
     test(std::string("(a([bc]))"), std::regex_constants::egrep, 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp b/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp
index 85900488f..27647f123 100644
--- a/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp
+++ b/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     std::regex r;
     std::locale loc = r.imbue(std::locale(LOCALE_en_US_UTF_8));
@@ -31,4 +30,6 @@ int main()
     loc = r.imbue(std::locale("C"));
     assert(loc.name() == LOCALE_en_US_UTF_8);
     assert(r.getloc().name() == "C");
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.nonmemb/nothing_to_do.pass.cpp b/test/std/re/re.regex/re.regex.nonmemb/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/re/re.regex/re.regex.nonmemb/nothing_to_do.pass.cpp
+++ b/test/std/re/re.regex/re.regex.nonmemb/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.nonmemb/re.regex.nmswap/swap.pass.cpp b/test/std/re/re.regex/re.regex.nonmemb/re.regex.nmswap/swap.pass.cpp
index 7b2317265..bb3291be6 100644
--- a/test/std/re/re.regex/re.regex.nonmemb/re.regex.nmswap/swap.pass.cpp
+++ b/test/std/re/re.regex/re.regex.nonmemb/re.regex.nmswap/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r1("(a([bc]))");
     std::regex r2;
@@ -27,4 +26,6 @@ int main()
     assert(r1.mark_count() == 0);
     assert(r2.flags() == std::regex::ECMAScript);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.operations/tested_elsewhere.pass.cpp b/test/std/re/re.regex/re.regex.operations/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/re/re.regex/re.regex.operations/tested_elsewhere.pass.cpp
+++ b/test/std/re/re.regex/re.regex.operations/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/re.regex.swap/swap.pass.cpp b/test/std/re/re.regex/re.regex.swap/swap.pass.cpp
index a04c64d4a..5092d57c1 100644
--- a/test/std/re/re.regex/re.regex.swap/swap.pass.cpp
+++ b/test/std/re/re.regex/re.regex.swap/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::regex r1("(a([bc]))");
     std::regex r2;
@@ -26,4 +25,6 @@ int main()
     assert(r1.mark_count() == 0);
     assert(r2.flags() == std::regex::ECMAScript);
     assert(r2.mark_count() == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.regex/types.pass.cpp b/test/std/re/re.regex/types.pass.cpp
index 2e48b4e84..a13ad180d 100644
--- a/test/std/re/re.regex/types.pass.cpp
+++ b/test/std/re/re.regex/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::basic_regex<char>::value_type, char>::value), "");
     static_assert((std::is_same<std::basic_regex<char>::traits_type, std::regex_traits<char> >::value), "");
@@ -39,4 +38,6 @@ int main()
     static_assert((std::is_same<std::basic_regex<wchar_t>::flag_type,
                                 std::regex_constants::syntax_option_type>::value), "");
     static_assert((std::is_same<std::basic_regex<wchar_t>::locale_type, std::locale>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.req/nothing_to_do.pass.cpp b/test/std/re/re.req/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/re/re.req/nothing_to_do.pass.cpp
+++ b/test/std/re/re.req/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/begin_end.pass.cpp b/test/std/re/re.results/re.results.acc/begin_end.pass.cpp
index 85b513426..48fff58b0 100644
--- a/test/std/re/re.results/re.results.acc/begin_end.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/begin_end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ test()
         assert(*i == m[j]);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/cbegin_cend.pass.cpp b/test/std/re/re.results/re.results.acc/cbegin_cend.pass.cpp
index 16ba38c61..bd9009a8a 100644
--- a/test/std/re/re.results/re.results.acc/cbegin_cend.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/cbegin_cend.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ test()
         assert(*i == m[j]);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/index.pass.cpp b/test/std/re/re.results/re.results.acc/index.pass.cpp
index 8118d3c9c..a5c25a82c 100644
--- a/test/std/re/re.results/re.results.acc/index.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,8 +46,10 @@ test(std::regex_constants::syntax_option_type syntax)
     assert(m[4].matched == false);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::regex_constants::ECMAScript);
     test(std::regex_constants::extended);
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/length.pass.cpp b/test/std/re/re.results/re.results.acc/length.pass.cpp
index 7bf689c5b..266ba692f 100644
--- a/test/std/re/re.results/re.results.acc/length.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,9 @@ test()
     assert(m.length(4) == m[4].length());
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/position.pass.cpp b/test/std/re/re.results/re.results.acc/position.pass.cpp
index b7df2c7c2..34256de35 100644
--- a/test/std/re/re.results/re.results.acc/position.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/position.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,9 @@ test()
     assert(m.position(4) == std::distance(s, m[4].first));
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/prefix.pass.cpp b/test/std/re/re.results/re.results.acc/prefix.pass.cpp
index 0c8572a0d..b2cd48d4d 100644
--- a/test/std/re/re.results/re.results.acc/prefix.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/prefix.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,9 @@ test()
     assert(m.prefix().matched == true);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/str.pass.cpp b/test/std/re/re.results/re.results.acc/str.pass.cpp
index 512bd9e69..ae4387d46 100644
--- a/test/std/re/re.results/re.results.acc/str.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,9 @@ test()
     assert(m.str(4) == std::string(m[4]));
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.acc/suffix.pass.cpp b/test/std/re/re.results/re.results.acc/suffix.pass.cpp
index a78bb67b4..c9d3855e9 100644
--- a/test/std/re/re.results/re.results.acc/suffix.pass.cpp
+++ b/test/std/re/re.results/re.results.acc/suffix.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,9 @@ test()
     assert(m.suffix().matched == true);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.all/get_allocator.pass.cpp b/test/std/re/re.results/re.results.all/get_allocator.pass.cpp
index c4fe96d4a..f0dcd7b6d 100644
--- a/test/std/re/re.results/re.results.all/get_allocator.pass.cpp
+++ b/test/std/re/re.results/re.results.all/get_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,8 +28,10 @@ test(const Allocator& a)
     assert(m.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test<char>(test_allocator<std::sub_match<const char*> >(3));
     test<wchar_t>(test_allocator<std::sub_match<const wchar_t*> >(3));
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.const/allocator.pass.cpp b/test/std/re/re.results/re.results.const/allocator.pass.cpp
index 73347d08c..99ecb667b 100644
--- a/test/std/re/re.results/re.results.const/allocator.pass.cpp
+++ b/test/std/re/re.results/re.results.const/allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,8 +28,10 @@ test(const Allocator& a)
     assert(m.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test<char>(test_allocator<std::sub_match<const char*> >(3));
     test<wchar_t>(test_allocator<std::sub_match<const wchar_t*> >(3));
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.const/copy.pass.cpp b/test/std/re/re.results/re.results.const/copy.pass.cpp
index ab0e388b5..a1dbea0e8 100644
--- a/test/std/re/re.results/re.results.const/copy.pass.cpp
+++ b/test/std/re/re.results/re.results.const/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,11 +30,13 @@ test(const Allocator& a)
     assert(m1.get_allocator() == m0.get_allocator());
 }
 
-int main()
+int main(int, char**)
 {
     test<char>   (std::allocator<std::sub_match<const char *> >());
     test<wchar_t>(std::allocator<std::sub_match<const wchar_t *> >());
 
     test<char>   (test_allocator<std::sub_match<const char*> >(3));
     test<wchar_t>(test_allocator<std::sub_match<const wchar_t*> >(3));
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.const/copy_assign.pass.cpp b/test/std/re/re.results/re.results.const/copy_assign.pass.cpp
index d390d62f0..943037e75 100644
--- a/test/std/re/re.results/re.results.const/copy_assign.pass.cpp
+++ b/test/std/re/re.results/re.results.const/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const Allocator& a)
         assert(m1.get_allocator() == Allocator());
 }
 
-int main()
+int main(int, char**)
 {
     test<char>   (std::allocator<std::sub_match<const char *> >());
     test<wchar_t>(std::allocator<std::sub_match<const wchar_t *> >());
@@ -47,4 +46,6 @@ int main()
 //  other_allocator has POCCA -> true
     test<char>   (other_allocator<std::sub_match<const char*> >(3));
     test<wchar_t>(other_allocator<std::sub_match<const wchar_t*> >(3));
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.const/default.pass.cpp b/test/std/re/re.results/re.results.const/default.pass.cpp
index 2fa85533a..a70c3441d 100644
--- a/test/std/re/re.results/re.results.const/default.pass.cpp
+++ b/test/std/re/re.results/re.results.const/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ test()
     assert(m.get_allocator() == std::allocator<std::sub_match<const CharT*> >());
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.const/move.pass.cpp b/test/std/re/re.results/re.results.const/move.pass.cpp
index 2c2233c76..778e31b26 100644
--- a/test/std/re/re.results/re.results.const/move.pass.cpp
+++ b/test/std/re/re.results/re.results.const/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03
@@ -36,7 +35,7 @@ test(const Allocator& a)
     assert(m1.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     test<char>   (std::allocator<std::sub_match<const char *> >());
     test<wchar_t>(std::allocator<std::sub_match<const wchar_t *> >());
@@ -45,4 +44,6 @@ int main()
     assert(test_alloc_base::moved == 1);
     test<wchar_t>(test_allocator<std::sub_match<const wchar_t*> >(3));
     assert(test_alloc_base::moved == 2);
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.const/move_assign.pass.cpp b/test/std/re/re.results/re.results.const/move_assign.pass.cpp
index 2d2e81b17..2a62af8f2 100644
--- a/test/std/re/re.results/re.results.const/move_assign.pass.cpp
+++ b/test/std/re/re.results/re.results.const/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++03
@@ -36,7 +35,7 @@ test(const Allocator& a)
         assert(m1.get_allocator() == Allocator());
 }
 
-int main()
+int main(int, char**)
 {
     test<char>   (std::allocator<std::sub_match<const char *> >());
     test<wchar_t>(std::allocator<std::sub_match<const wchar_t *> >());
@@ -48,4 +47,6 @@ int main()
 //  other_allocator has POCMA -> true
     test<char>   (other_allocator<std::sub_match<const char*> >(3));
     test<wchar_t>(other_allocator<std::sub_match<const wchar_t*> >(3));
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.form/form1.pass.cpp b/test/std/re/re.results/re.results.form/form1.pass.cpp
index 55b5ade79..f435de827 100644
--- a/test/std/re/re.results/re.results.form/form1.pass.cpp
+++ b/test/std/re/re.results/re.results.form/form1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::match_results<const char*> m;
@@ -153,4 +152,6 @@ int main()
         assert(r == out + 34);
         assert(std::wstring(out) == L"match: cdefghi, m[1]: efg, m[2]: e");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.form/form2.pass.cpp b/test/std/re/re.results/re.results.form/form2.pass.cpp
index ab7a525f4..b28c064e1 100644
--- a/test/std/re/re.results/re.results.form/form2.pass.cpp
+++ b/test/std/re/re.results/re.results.form/form2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 #include "test_iterators.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::basic_string<char, std::char_traits<char>, test_allocator<char> > nstr;
     typedef std::basic_string<wchar_t, std::char_traits<wchar_t>, test_allocator<wchar_t> > wstr;
@@ -100,4 +99,6 @@ int main()
         assert(r == out + 34);
         assert(std::wstring(out) == L"match: cdefghi, m[1]: efg, m[2]: e");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.form/form3.pass.cpp b/test/std/re/re.results/re.results.form/form3.pass.cpp
index e4c2e3d20..62a735ca6 100644
--- a/test/std/re/re.results/re.results.form/form3.pass.cpp
+++ b/test/std/re/re.results/re.results.form/form3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::basic_string<char, std::char_traits<char>, test_allocator<char> > nstr;
     typedef std::basic_string<wchar_t, std::char_traits<wchar_t>, test_allocator<wchar_t> > wstr;
@@ -83,4 +82,6 @@ int main()
         wstr out = m.format(fmt, std::regex_constants::format_sed);
         assert(out == L"match: cdefghi, m[1]: efg, m[2]: e");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.form/form4.pass.cpp b/test/std/re/re.results/re.results.form/form4.pass.cpp
index 2c8aa9b8f..658e788b6 100644
--- a/test/std/re/re.results/re.results.form/form4.pass.cpp
+++ b/test/std/re/re.results/re.results.form/form4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::match_results<const char*> m;
@@ -78,4 +77,6 @@ int main()
         std::wstring out = m.format(fmt, std::regex_constants::format_sed);
         assert(out == L"match: cdefghi, m[1]: efg, m[2]: e");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.nonmember/equal.pass.cpp b/test/std/re/re.results/re.results.nonmember/equal.pass.cpp
index 0a32f2e25..3723ad474 100644
--- a/test/std/re/re.results/re.results.nonmember/equal.pass.cpp
+++ b/test/std/re/re.results/re.results.nonmember/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,9 @@ test()
     assert(m1 == m2);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.size/empty.fail.cpp b/test/std/re/re.results/re.results.size/empty.fail.cpp
index 6f677f390..e17c77424 100644
--- a/test/std/re/re.results/re.results.size/empty.fail.cpp
+++ b/test/std/re/re.results/re.results.size/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,8 +19,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::match_results<const char*> c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.size/empty.pass.cpp b/test/std/re/re.results/re.results.size/empty.pass.cpp
index f03f5f752..7eaed34ac 100644
--- a/test/std/re/re.results/re.results.size/empty.pass.cpp
+++ b/test/std/re/re.results/re.results.size/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,9 @@ test()
     assert(m.size() == 3);
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.size/max_size.pass.cpp b/test/std/re/re.results/re.results.size/max_size.pass.cpp
index 1ba29b926..184933d13 100644
--- a/test/std/re/re.results/re.results.size/max_size.pass.cpp
+++ b/test/std/re/re.results/re.results.size/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ test()
     assert(m.max_size() > 0);
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.state/ready.pass.cpp b/test/std/re/re.results/re.results.state/ready.pass.cpp
index 1348016bb..476a66fdf 100644
--- a/test/std/re/re.results/re.results.state/ready.pass.cpp
+++ b/test/std/re/re.results/re.results.state/ready.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,8 +36,10 @@ test2()
     assert(m.ready() == true);
 }
 
-int main()
+int main(int, char**)
 {
     test1();
     test2();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.swap/member_swap.pass.cpp b/test/std/re/re.results/re.results.swap/member_swap.pass.cpp
index cd1d72a2d..967fe11c5 100644
--- a/test/std/re/re.results/re.results.swap/member_swap.pass.cpp
+++ b/test/std/re/re.results/re.results.swap/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ test()
     assert(m2 == m1_save);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/re.results.swap/non_member_swap.pass.cpp b/test/std/re/re.results/re.results.swap/non_member_swap.pass.cpp
index 81e6c819e..59ba59f3d 100644
--- a/test/std/re/re.results/re.results.swap/non_member_swap.pass.cpp
+++ b/test/std/re/re.results/re.results.swap/non_member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,9 @@ test()
     assert(m2 == m1_save);
 }
 
-int main()
+int main(int, char**)
 {
     test();
+
+  return 0;
 }
diff --git a/test/std/re/re.results/types.pass.cpp b/test/std/re/re.results/types.pass.cpp
index 0b76875fe..0fd822084 100644
--- a/test/std/re/re.results/types.pass.cpp
+++ b/test/std/re/re.results/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,8 +44,10 @@ test()
     static_assert((std::is_same<typename MR::string_type, std::basic_string<CharT> >::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<char>();
     test<wchar_t>();
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.members/compare_string_type.pass.cpp b/test/std/re/re.submatch/re.submatch.members/compare_string_type.pass.cpp
index 1634c5a39..6b57a193a 100644
--- a/test/std/re/re.submatch/re.submatch.members/compare_string_type.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.members/compare_string_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef char CharT;
@@ -45,4 +44,6 @@ int main()
         assert(sm.compare(string()) > 0);
         assert(sm.compare(string(L"123")) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.members/compare_sub_match.pass.cpp b/test/std/re/re.submatch/re.submatch.members/compare_sub_match.pass.cpp
index 4b74f65d7..6d0976bbf 100644
--- a/test/std/re/re.submatch/re.submatch.members/compare_sub_match.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.members/compare_sub_match.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef char CharT;
@@ -51,4 +50,6 @@ int main()
         sm2.matched = true;
         assert(sm.compare(sm2) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.members/compare_value_type_ptr.pass.cpp b/test/std/re/re.submatch/re.submatch.members/compare_value_type_ptr.pass.cpp
index 5e2ea8fb5..42e6ab94a 100644
--- a/test/std/re/re.submatch/re.submatch.members/compare_value_type_ptr.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.members/compare_value_type_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef char CharT;
@@ -43,4 +42,6 @@ int main()
         assert(sm.compare(L"") > 0);
         assert(sm.compare(L"123") == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.members/default.pass.cpp b/test/std/re/re.submatch/re.submatch.members/default.pass.cpp
index 1805f7eb3..c34591f22 100644
--- a/test/std/re/re.submatch/re.submatch.members/default.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.members/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef char CharT;
@@ -31,4 +30,6 @@ int main()
         SM sm;
         assert(sm.matched == false);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.members/length.pass.cpp b/test/std/re/re.submatch/re.submatch.members/length.pass.cpp
index 20095483d..5246eb351 100644
--- a/test/std/re/re.submatch/re.submatch.members/length.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.members/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef char CharT;
@@ -41,4 +40,6 @@ int main()
         sm.matched = true;
         assert(sm.length() == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.members/operator_string.pass.cpp b/test/std/re/re.submatch/re.submatch.members/operator_string.pass.cpp
index 4c2877cd4..051ecc3e8 100644
--- a/test/std/re/re.submatch/re.submatch.members/operator_string.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.members/operator_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef char CharT;
@@ -45,4 +44,6 @@ int main()
         str = sm;
         assert(str == std::wstring(L"123"));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.members/str.pass.cpp b/test/std/re/re.submatch/re.submatch.members/str.pass.cpp
index 9a8218901..af39ee9c3 100644
--- a/test/std/re/re.submatch/re.submatch.members/str.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.members/str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef char CharT;
@@ -45,4 +44,6 @@ int main()
         str = sm.str();
         assert(str == std::wstring(L"123"));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.op/compare.pass.cpp b/test/std/re/re.submatch/re.submatch.op/compare.pass.cpp
index 8000ab6b7..e332a8379 100644
--- a/test/std/re/re.submatch/re.submatch.op/compare.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.op/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -277,7 +276,7 @@ test(const std::basic_string<CharT>& x, const std::basic_string<CharT>& y, bool
     assert((sm1 >= y[0]) == (x >= string(1, y[0])));
 }
 
-int main()
+int main(int, char**)
 {
     test(std::string("123"), std::string("123"));
     test(std::string("1234"), std::string("123"));
@@ -285,4 +284,6 @@ int main()
     test(std::wstring(L"1234"), std::wstring(L"123"));
     test(std::string("123\000" "56", 6), std::string("123\000" "56", 6), false);
     test(std::wstring(L"123\000" L"56", 6), std::wstring(L"123\000" L"56", 6), false);
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/re.submatch.op/stream.pass.cpp b/test/std/re/re.submatch/re.submatch.op/stream.pass.cpp
index 9f8c9869e..070266d9e 100644
--- a/test/std/re/re.submatch/re.submatch.op/stream.pass.cpp
+++ b/test/std/re/re.submatch/re.submatch.op/stream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,8 +35,10 @@ test(const std::basic_string<CharT>& s)
     assert(os.str() == s);
 }
 
-int main()
+int main(int, char**)
 {
     test(std::string("123"));
     test(std::wstring(L"123"));
+
+  return 0;
 }
diff --git a/test/std/re/re.submatch/types.pass.cpp b/test/std/re/re.submatch/types.pass.cpp
index e5a00ca04..831eec1da 100644
--- a/test/std/re/re.submatch/types.pass.cpp
+++ b/test/std/re/re.submatch/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::sub_match<char*> SM;
@@ -62,4 +61,6 @@ int main()
         static_assert((std::is_same<std::ssub_match, std::sub_match<std::string::const_iterator> >::value), "");
         static_assert((std::is_same<std::wssub_match, std::sub_match<std::wstring::const_iterator> >::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/cmatch.pass.cpp b/test/std/re/re.syn/cmatch.pass.cpp
index bf467bcbc..7b85a69a2 100644
--- a/test/std/re/re.syn/cmatch.pass.cpp
+++ b/test/std/re/re.syn/cmatch.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::match_results<const char*>, std::cmatch>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/cregex_iterator.pass.cpp b/test/std/re/re.syn/cregex_iterator.pass.cpp
index ed5839da0..29fdadeb6 100644
--- a/test/std/re/re.syn/cregex_iterator.pass.cpp
+++ b/test/std/re/re.syn/cregex_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_iterator<const char*>, std::cregex_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/cregex_token_iterator.pass.cpp b/test/std/re/re.syn/cregex_token_iterator.pass.cpp
index 85dca0cf2..7ca531dfe 100644
--- a/test/std/re/re.syn/cregex_token_iterator.pass.cpp
+++ b/test/std/re/re.syn/cregex_token_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_token_iterator<const char*>, std::cregex_token_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/csub_match.pass.cpp b/test/std/re/re.syn/csub_match.pass.cpp
index 2a87d8b6e..2ace0b983 100644
--- a/test/std/re/re.syn/csub_match.pass.cpp
+++ b/test/std/re/re.syn/csub_match.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::sub_match<const char*>, std::csub_match>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/regex.pass.cpp b/test/std/re/re.syn/regex.pass.cpp
index 32fcb82f1..0b4c07b6f 100644
--- a/test/std/re/re.syn/regex.pass.cpp
+++ b/test/std/re/re.syn/regex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::basic_regex<char>, std::regex>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/smatch.pass.cpp b/test/std/re/re.syn/smatch.pass.cpp
index e2fc06113..01fa1e955 100644
--- a/test/std/re/re.syn/smatch.pass.cpp
+++ b/test/std/re/re.syn/smatch.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::match_results<std::string::const_iterator>, std::smatch>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/sregex_iterator.pass.cpp b/test/std/re/re.syn/sregex_iterator.pass.cpp
index 146316408..1ae462c6b 100644
--- a/test/std/re/re.syn/sregex_iterator.pass.cpp
+++ b/test/std/re/re.syn/sregex_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_iterator<std::string::const_iterator>, std::sregex_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/sregex_token_iterator.pass.cpp b/test/std/re/re.syn/sregex_token_iterator.pass.cpp
index aa85680c5..4b67b66f2 100644
--- a/test/std/re/re.syn/sregex_token_iterator.pass.cpp
+++ b/test/std/re/re.syn/sregex_token_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_token_iterator<std::string::const_iterator>, std::sregex_token_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/ssub_match.pass.cpp b/test/std/re/re.syn/ssub_match.pass.cpp
index 181b7a307..fe3312968 100644
--- a/test/std/re/re.syn/ssub_match.pass.cpp
+++ b/test/std/re/re.syn/ssub_match.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::sub_match<std::string::const_iterator>, std::ssub_match>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wcmatch.pass.cpp b/test/std/re/re.syn/wcmatch.pass.cpp
index 0eb125602..f373e57ac 100644
--- a/test/std/re/re.syn/wcmatch.pass.cpp
+++ b/test/std/re/re.syn/wcmatch.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::match_results<const wchar_t*>, std::wcmatch>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wcregex_iterator.pass.cpp b/test/std/re/re.syn/wcregex_iterator.pass.cpp
index 20c0d0d54..3425c98fe 100644
--- a/test/std/re/re.syn/wcregex_iterator.pass.cpp
+++ b/test/std/re/re.syn/wcregex_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_iterator<const wchar_t*>, std::wcregex_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wcregex_token_iterator.pass.cpp b/test/std/re/re.syn/wcregex_token_iterator.pass.cpp
index 01a7f3c74..217653837 100644
--- a/test/std/re/re.syn/wcregex_token_iterator.pass.cpp
+++ b/test/std/re/re.syn/wcregex_token_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_token_iterator<const wchar_t*>, std::wcregex_token_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wcsub_match.pass.cpp b/test/std/re/re.syn/wcsub_match.pass.cpp
index f757d3f7c..86a2103b8 100644
--- a/test/std/re/re.syn/wcsub_match.pass.cpp
+++ b/test/std/re/re.syn/wcsub_match.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::sub_match<const wchar_t*>, std::wcsub_match>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wregex.pass.cpp b/test/std/re/re.syn/wregex.pass.cpp
index 23be43baa..5be6f6fb5 100644
--- a/test/std/re/re.syn/wregex.pass.cpp
+++ b/test/std/re/re.syn/wregex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::basic_regex<wchar_t>, std::wregex>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wsmatch.pass.cpp b/test/std/re/re.syn/wsmatch.pass.cpp
index 1483808bd..760057e6a 100644
--- a/test/std/re/re.syn/wsmatch.pass.cpp
+++ b/test/std/re/re.syn/wsmatch.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::match_results<std::wstring::const_iterator>, std::wsmatch>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wsregex_iterator.pass.cpp b/test/std/re/re.syn/wsregex_iterator.pass.cpp
index 436e6d717..b1d7edf87 100644
--- a/test/std/re/re.syn/wsregex_iterator.pass.cpp
+++ b/test/std/re/re.syn/wsregex_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_iterator<std::wstring::const_iterator>, std::wsregex_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wsregex_token_iterator.pass.cpp b/test/std/re/re.syn/wsregex_token_iterator.pass.cpp
index 5ceb241f3..58454a59e 100644
--- a/test/std/re/re.syn/wsregex_token_iterator.pass.cpp
+++ b/test/std/re/re.syn/wsregex_token_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_token_iterator<std::wstring::const_iterator>, std::wsregex_token_iterator>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.syn/wssub_match.pass.cpp b/test/std/re/re.syn/wssub_match.pass.cpp
index 23b92bb2d..7ca6dc773 100644
--- a/test/std/re/re.syn/wssub_match.pass.cpp
+++ b/test/std/re/re.syn/wssub_match.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::sub_match<std::wstring::const_iterator>, std::wssub_match>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/default.pass.cpp b/test/std/re/re.traits/default.pass.cpp
index b1e23587d..459f044e0 100644
--- a/test/std/re/re.traits/default.pass.cpp
+++ b/test/std/re/re.traits/default.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t1;
@@ -37,4 +36,6 @@ int main()
         std::regex_traits<wchar_t> t2;
         assert(t2.getloc().name() == LOCALE_en_US_UTF_8);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/getloc.pass.cpp b/test/std/re/re.traits/getloc.pass.cpp
index 929659d00..dbc35dec3 100644
--- a/test/std/re/re.traits/getloc.pass.cpp
+++ b/test/std/re/re.traits/getloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "test_macros.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t1;
@@ -36,4 +35,6 @@ int main()
         std::regex_traits<wchar_t> t2;
         assert(t2.getloc().name() == LOCALE_en_US_UTF_8);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/imbue.pass.cpp b/test/std/re/re.traits/imbue.pass.cpp
index 04b4f5f76..0200ce01e 100644
--- a/test/std/re/re.traits/imbue.pass.cpp
+++ b/test/std/re/re.traits/imbue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t;
@@ -30,4 +29,6 @@ int main()
         assert(loc.name() == "C");
         assert(t.getloc().name() == LOCALE_en_US_UTF_8);
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/isctype.pass.cpp b/test/std/re/re.traits/isctype.pass.cpp
index 3d1e7470a..1eed193ae 100644
--- a/test/std/re/re.traits/isctype.pass.cpp
+++ b/test/std/re/re.traits/isctype.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t;
@@ -281,4 +280,6 @@ int main()
         assert(!t.isctype(L'-', t.lookup_classname(s.begin(), s.end())));
         assert(!t.isctype(L'@', t.lookup_classname(s.begin(), s.end())));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/length.pass.cpp b/test/std/re/re.traits/length.pass.cpp
index b80f9b5b4..dce6284bc 100644
--- a/test/std/re/re.traits/length.pass.cpp
+++ b/test/std/re/re.traits/length.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::regex_traits<char>::length("") == 0);
     assert(std::regex_traits<char>::length("1") == 1);
@@ -29,4 +28,6 @@ int main()
     assert(std::regex_traits<wchar_t>::length(L"1") == 1);
     assert(std::regex_traits<wchar_t>::length(L"12") == 2);
     assert(std::regex_traits<wchar_t>::length(L"123") == 3);
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/lookup_classname.pass.cpp b/test/std/re/re.traits/lookup_classname.pass.cpp
index b61f772b2..38bafa67e 100644
--- a/test/std/re/re.traits/lookup_classname.pass.cpp
+++ b/test/std/re/re.traits/lookup_classname.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ test_w(const char_type* A,
       assert(!matches_underscore && "should not match underscore");
 }
 
-int main()
+int main(int, char**)
 {
 //  if __regex_word is not distinct from all the classes, bad things happen
 //  See https://bugs.llvm.org/show_bug.cgi?id=26476 for an example.
@@ -244,4 +243,6 @@ int main()
     test(L"dig", std::ctype_base::mask());
     test(L"", std::ctype_base::mask());
     test(L"digits", std::ctype_base::mask());
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/lookup_collatename.pass.cpp b/test/std/re/re.traits/lookup_collatename.pass.cpp
index ef5c14257..aeb7c50bb 100644
--- a/test/std/re/re.traits/lookup_collatename.pass.cpp
+++ b/test/std/re/re.traits/lookup_collatename.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@ test(const char_type* A, const std::basic_string<char_type>& expected)
     assert(t.lookup_collatename(F(A), F(A + t.length(A))) == expected);
 }
 
-int main()
+int main(int, char**)
 {
     test("NUL", std::string("\x00", 1));
     test("alert", std::string("\x07"));
@@ -193,4 +192,6 @@ int main()
     std::locale::global(std::locale(LOCALE_cs_CZ_ISO8859_2));
     test(L"ch", std::wstring(L"ch"));
     std::locale::global(std::locale("C"));
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/transform.pass.cpp b/test/std/re/re.traits/transform.pass.cpp
index 7563b3952..0125d419e 100644
--- a/test/std/re/re.traits/transform.pass.cpp
+++ b/test/std/re/re.traits/transform.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@
 #include "test_iterators.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t;
@@ -46,4 +45,6 @@ int main()
         t.imbue(std::locale(LOCALE_cs_CZ_ISO8859_2));
         assert(t.transform(F(a), F(a+1)) < t.transform(F(B), F(B+1)));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/transform_primary.pass.cpp b/test/std/re/re.traits/transform_primary.pass.cpp
index 2dd8ed247..e24125e06 100644
--- a/test/std/re/re.traits/transform_primary.pass.cpp
+++ b/test/std/re/re.traits/transform_primary.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,7 @@
 #include "test_iterators.h"
 #include "platform_support.h" // locale name macros
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t;
@@ -52,4 +51,6 @@ int main()
         assert(t.transform_primary(F(A), F(A+1)) ==
                t.transform_primary(F(Aacute), F(Aacute+1)));
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/translate.pass.cpp b/test/std/re/re.traits/translate.pass.cpp
index 7eaf30ea7..e56af4df3 100644
--- a/test/std/re/re.traits/translate.pass.cpp
+++ b/test/std/re/re.traits/translate.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t;
@@ -32,4 +31,6 @@ int main()
         assert(t.translate(L'B') == L'B');
         assert(t.translate(L'c') == L'c');
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/translate_nocase.pass.cpp b/test/std/re/re.traits/translate_nocase.pass.cpp
index 601da6b86..6e9f01d16 100644
--- a/test/std/re/re.traits/translate_nocase.pass.cpp
+++ b/test/std/re/re.traits/translate_nocase.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "platform_support.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t;
@@ -62,4 +61,6 @@ int main()
         assert(t.translate_nocase(L'\xDA') == L'\xFA');
         assert(t.translate_nocase(L'\xFA') == L'\xFA');
     }
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/types.pass.cpp b/test/std/re/re.traits/types.pass.cpp
index 611ef0434..c3a8770f0 100644
--- a/test/std/re/re.traits/types.pass.cpp
+++ b/test/std/re/re.traits/types.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <type_traits>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::regex_traits<char>::char_type, char>::value), "");
     static_assert((std::is_same<std::regex_traits<char>::string_type, std::string>::value), "");
@@ -30,4 +29,6 @@ int main()
     static_assert((std::is_same<std::regex_traits<wchar_t>::char_type, wchar_t>::value), "");
     static_assert((std::is_same<std::regex_traits<wchar_t>::string_type, std::wstring>::value), "");
     static_assert((std::is_same<std::regex_traits<wchar_t>::locale_type, std::locale>::value), "");
+
+  return 0;
 }
diff --git a/test/std/re/re.traits/value.pass.cpp b/test/std/re/re.traits/value.pass.cpp
index 3a25f35df..b7ca1fb7c 100644
--- a/test/std/re/re.traits/value.pass.cpp
+++ b/test/std/re/re.traits/value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::regex_traits<char> t;
@@ -123,4 +122,6 @@ int main()
             assert(t.value(c, 16) == -1);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp b/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
index e6f3d53a8..0fecb1bb0 100644
--- a/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
+++ b/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
   {
     test_hash_enabled_for_type<std::string>();
@@ -31,4 +30,6 @@ int main() {
     test_hash_enabled_for_type<std::u32string>();
 #endif
   }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.hash/strings.pass.cpp b/test/std/strings/basic.string.hash/strings.pass.cpp
index 449ad8f11..c2a2ef956 100644
--- a/test/std/strings/basic.string.hash/strings.pass.cpp
+++ b/test/std/strings/basic.string.hash/strings.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ test()
     assert(h(s1) != h(s2));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::string>();
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -52,4 +51,6 @@ int main()
     test<std::u32string>();
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
     test<std::wstring>();
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.literals/literal.pass.cpp b/test/std/strings/basic.string.literals/literal.pass.cpp
index cbb03ef61..a51d0d9ac 100644
--- a/test/std/strings/basic.string.literals/literal.pass.cpp
+++ b/test/std/strings/basic.string.literals/literal.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #endif
 
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals::string_literals;
 
@@ -55,4 +54,6 @@ int main()
     Lfoo  =  L"ABC"s;     assert( Lfoo ==  L"ABC");   assert( Lfoo == std::wstring  ( L"ABC"));
     ufoo  =  u"ABC"s;     assert( ufoo ==  u"ABC");   assert( ufoo == std::u16string( u"ABC"));
     Ufoo  =  U"ABC"s;     assert( Ufoo ==  U"ABC");   assert( Ufoo == std::u32string( U"ABC"));
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.literals/literal1.fail.cpp b/test/std/strings/basic.string.literals/literal1.fail.cpp
index 721440d8a..be4604059 100644
--- a/test/std/strings/basic.string.literals/literal1.fail.cpp
+++ b/test/std/strings/basic.string.literals/literal1.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,9 +12,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using std::string;
 
     string foo  =   ""s;  // should fail w/conversion operator not found
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.literals/literal1.pass.cpp b/test/std/strings/basic.string.literals/literal1.pass.cpp
index f0b7b463f..92777c4f4 100644
--- a/test/std/strings/basic.string.literals/literal1.pass.cpp
+++ b/test/std/strings/basic.string.literals/literal1.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,9 +12,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals;
 
     std::string foo  =   ""s;
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.literals/literal2.fail.cpp b/test/std/strings/basic.string.literals/literal2.fail.cpp
index 99f92fde9..54a0a9e40 100644
--- a/test/std/strings/basic.string.literals/literal2.fail.cpp
+++ b/test/std/strings/basic.string.literals/literal2.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,9 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::string foo  =   ""s;  // should fail w/conversion operator not found
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.literals/literal2.pass.cpp b/test/std/strings/basic.string.literals/literal2.pass.cpp
index 3cc2936a1..6f73ae9a1 100644
--- a/test/std/strings/basic.string.literals/literal2.pass.cpp
+++ b/test/std/strings/basic.string.literals/literal2.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,9 +12,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals::string_literals;
 
     std::string foo  =   ""s;
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string.literals/literal3.pass.cpp b/test/std/strings/basic.string.literals/literal3.pass.cpp
index d6e8c8f88..b7a8d5536 100644
--- a/test/std/strings/basic.string.literals/literal3.pass.cpp
+++ b/test/std/strings/basic.string.literals/literal3.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,9 +12,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std;
 
     string foo  =   ""s;
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/allocator_mismatch.fail.cpp b/test/std/strings/basic.string/allocator_mismatch.fail.cpp
index 644137ec2..1d016991f 100644
--- a/test/std/strings/basic.string/allocator_mismatch.fail.cpp
+++ b/test/std/strings/basic.string/allocator_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <string>
 
-int main()
+int main(int, char**)
 {
     std::basic_string<char, std::char_traits<char>, std::allocator<int> > s;
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/char.bad.fail.cpp b/test/std/strings/basic.string/char.bad.fail.cpp
index 1878cd02c..bace91c32 100644
--- a/test/std/strings/basic.string/char.bad.fail.cpp
+++ b/test/std/strings/basic.string/char.bad.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ private:
     int two;
 };
 
-int main()
+int main(int, char**)
 {
     {
 //  array
@@ -50,4 +49,6 @@ int main()
     std::basic_string<NotStandardLayout, test_traits<NotStandardLayout> > s;
 //  expected-error-re@string:* {{static_assert failed{{.*}} "Character type of basic_string must be standard-layout"}}
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/input_iterator.h b/test/std/strings/basic.string/input_iterator.h
index fa6bb80a1..131be9fad 100644
--- a/test/std/strings/basic.string/input_iterator.h
+++ b/test/std/strings/basic.string/input_iterator.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/strings/basic.string/string.access/at.pass.cpp b/test/std/strings/basic.string/string.access/at.pass.cpp
index 16121cbf6..514d1a894 100644
--- a/test/std/strings/basic.string/string.access/at.pass.cpp
+++ b/test/std/strings/basic.string/string.access/at.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ test(S s, typename S::size_type pos)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -75,4 +74,6 @@ int main()
     test(S("123"), 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.access/back.pass.cpp b/test/std/strings/basic.string/string.access/back.pass.cpp
index adf22bf0d..3831da084 100644
--- a/test/std/strings/basic.string/string.access/back.pass.cpp
+++ b/test/std/strings/basic.string/string.access/back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(S s)
     assert(s.back() == typename S::value_type('z'));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -53,4 +52,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.access/db_back.pass.cpp b/test/std/strings/basic.string/string.access/db_back.pass.cpp
index e65ef2cef..e1cf707a6 100644
--- a/test/std/strings/basic.string/string.access/db_back.pass.cpp
+++ b/test/std/strings/basic.string/string.access/db_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.access/db_cback.pass.cpp b/test/std/strings/basic.string/string.access/db_cback.pass.cpp
index ee99aee10..e3e6db525 100644
--- a/test/std/strings/basic.string/string.access/db_cback.pass.cpp
+++ b/test/std/strings/basic.string/string.access/db_cback.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -43,8 +42,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.access/db_cfront.pass.cpp b/test/std/strings/basic.string/string.access/db_cfront.pass.cpp
index 130496245..c9b2ba7c8 100644
--- a/test/std/strings/basic.string/string.access/db_cfront.pass.cpp
+++ b/test/std/strings/basic.string/string.access/db_cfront.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -43,8 +42,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.access/db_cindex.pass.cpp b/test/std/strings/basic.string/string.access/db_cindex.pass.cpp
index f96ead7bf..c7b430efc 100644
--- a/test/std/strings/basic.string/string.access/db_cindex.pass.cpp
+++ b/test/std/strings/basic.string/string.access/db_cindex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -45,8 +44,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.access/db_front.pass.cpp b/test/std/strings/basic.string/string.access/db_front.pass.cpp
index 881a5ede3..73db22405 100644
--- a/test/std/strings/basic.string/string.access/db_front.pass.cpp
+++ b/test/std/strings/basic.string/string.access/db_front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.access/db_index.pass.cpp b/test/std/strings/basic.string/string.access/db_index.pass.cpp
index 981a55d11..d3f2e8d28 100644
--- a/test/std/strings/basic.string/string.access/db_index.pass.cpp
+++ b/test/std/strings/basic.string/string.access/db_index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -45,8 +44,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.access/front.pass.cpp b/test/std/strings/basic.string/string.access/front.pass.cpp
index 5400ddb39..d51a12f0a 100644
--- a/test/std/strings/basic.string/string.access/front.pass.cpp
+++ b/test/std/strings/basic.string/string.access/front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(S s)
     assert(s.front() == typename S::value_type('z'));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -53,4 +52,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.access/index.pass.cpp b/test/std/strings/basic.string/string.access/index.pass.cpp
index f4053dff1..3a1224ca3 100644
--- a/test/std/strings/basic.string/string.access/index.pass.cpp
+++ b/test/std/strings/basic.string/string.access/index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -60,4 +59,6 @@ int main()
         assert(false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/capacity.pass.cpp b/test/std/strings/basic.string/string.capacity/capacity.pass.cpp
index 79fbd2e96..02187c519 100644
--- a/test/std/strings/basic.string/string.capacity/capacity.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/capacity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ test(S s)
     S::allocator_type::throw_after = INT_MAX;
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::basic_string<char, std::char_traits<char>, test_allocator<char> > S;
@@ -61,4 +60,6 @@ int main()
     assert(s.capacity() > 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/clear.pass.cpp b/test/std/strings/basic.string/string.capacity/clear.pass.cpp
index e0254c046..914842bb7 100644
--- a/test/std/strings/basic.string/string.capacity/clear.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/clear.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(S s)
     assert(s.size() == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -54,4 +53,6 @@ int main()
     test(s);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/empty.fail.cpp b/test/std/strings/basic.string/string.capacity/empty.fail.cpp
index addb02ed3..1bfa388b7 100644
--- a/test/std/strings/basic.string/string.capacity/empty.fail.cpp
+++ b/test/std/strings/basic.string/string.capacity/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::string c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/empty.pass.cpp b/test/std/strings/basic.string/string.capacity/empty.pass.cpp
index a61a410a4..47827db7f 100644
--- a/test/std/strings/basic.string/string.capacity/empty.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const S& s)
     assert(s.empty() == (s.size() == 0));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -41,4 +40,6 @@ int main()
     test(S("12345678901234567890123456789012345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/length.pass.cpp b/test/std/strings/basic.string/string.capacity/length.pass.cpp
index 13e966dc6..b61ec488e 100644
--- a/test/std/strings/basic.string/string.capacity/length.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& s)
     assert(s.length() == s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -39,4 +38,6 @@ int main()
     test(S("12345678901234567890123456789012345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/max_size.pass.cpp b/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
index a8f8126f7..8f8c9a3fb 100644
--- a/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ test(const S& s)
     test2(s);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -71,4 +70,6 @@ int main()
     test(S("12345678901234567890123456789012345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp b/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
index 3dfd32aeb..9832df536 100644
--- a/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ test(const S& s)
     assert ( false );
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -52,4 +51,6 @@ int main()
     test(S("12345678901234567890123456789012345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/reserve.pass.cpp b/test/std/strings/basic.string/string.capacity/reserve.pass.cpp
index 8b9dc13db..f49125cec 100644
--- a/test/std/strings/basic.string/string.capacity/reserve.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/reserve.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ test(S s, typename S::size_type res_arg)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -132,4 +131,6 @@ int main()
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp b/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp
index 78200d50c..8b545939e 100644
--- a/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test(S s, typename S::size_type n, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -86,4 +85,6 @@ int main()
     test(S(), S::npos, S("not going to happen"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp b/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp
index 288eb3252..b5e5aff84 100644
--- a/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test(S s, typename S::size_type n, typename S::value_type c, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -86,4 +85,6 @@ int main()
     test(S(), S::npos, 'a', S("not going to happen"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp b/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp
index 656ea1d11..2c6ce0df6 100644
--- a/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(S s)
     assert(s.capacity() >= s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -60,4 +59,6 @@ int main()
     test(s);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.capacity/size.pass.cpp b/test/std/strings/basic.string/string.capacity/size.pass.cpp
index 4657aea44..f3f89a5a6 100644
--- a/test/std/strings/basic.string/string.capacity/size.pass.cpp
+++ b/test/std/strings/basic.string/string.capacity/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& s, typename S::size_type c)
     assert(s.size() == c);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -39,4 +38,6 @@ int main()
     test(S("12345678901234567890123456789012345678901234567890"), 50);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp b/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp
index 67ac43494..38725979f 100644
--- a/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -92,7 +91,7 @@ test(SV sv, std::size_t pos, std::size_t n, const typename S::allocator_type& a)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -184,4 +183,6 @@ int main()
     S s7(s.data(), 2);     // calls ctor(const char *, len)
     assert(s7 == "AB");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/alloc.pass.cpp b/test/std/strings/basic.string/string.cons/alloc.pass.cpp
index 9e3fb0722..765f61eaf 100644
--- a/test/std/strings/basic.string/string.cons/alloc.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -86,11 +85,13 @@ test2()
 
 #endif
 
-int main()
+int main(int, char**)
 {
     test<std::basic_string<char, std::char_traits<char>, test_allocator<char> > >();
 #if TEST_STD_VER >= 11
     test2<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
     test2<std::basic_string<char, std::char_traits<char>, explicit_allocator<char> > >();
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/brace_assignment.pass.cpp b/test/std/strings/basic.string/string.cons/brace_assignment.pass.cpp
index 8b498f178..5e77e46b2 100644
--- a/test/std/strings/basic.string/string.cons/brace_assignment.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/brace_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
   // Test that assignment from {} and {ptr, len} are allowed and are not
   // ambiguous.
@@ -33,4 +32,6 @@ int main()
     s = {"abc", 2};
     assert(s == "ab");
   }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp b/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp
index f6bacb70e..53f676e3b 100644
--- a/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(S s1, typename S::value_type s2)
     assert(s1.capacity() >= s1.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -47,4 +46,6 @@ int main()
     test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 'a');
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/copy.pass.cpp b/test/std/strings/basic.string/string.cons/copy.pass.cpp
index cc4deb992..0024f2def 100644
--- a/test/std/strings/basic.string/string.cons/copy.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(S s1)
     assert(s2.get_allocator() == s1.get_allocator());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -47,4 +46,6 @@ int main()
     test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp b/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp
index edd5c6e32..a635f017e 100644
--- a/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -88,7 +87,7 @@ test(S s1, const typename S::allocator_type& a)
     assert(s2.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -128,4 +127,6 @@ int main()
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp b/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp
index 34d5f306a..8b3b7ac04 100644
--- a/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(S s1, const S& s2)
     assert(s1.capacity() >= s1.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -77,4 +76,6 @@ int main()
     assert(s == "a");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/default_noexcept.pass.cpp b/test/std/strings/basic.string/string.cons/default_noexcept.pass.cpp
index a995a51ee..301876b2c 100644
--- a/test/std/strings/basic.string/string.cons/default_noexcept.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/default_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::string C;
@@ -36,4 +35,6 @@ int main()
         typedef std::basic_string<char, std::char_traits<char>, limited_allocator<char, 10>> C;
         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/dtor_noexcept.pass.cpp b/test/std/strings/basic.string/string.cons/dtor_noexcept.pass.cpp
index a4de566a4..d1372d296 100644
--- a/test/std/strings/basic.string/string.cons/dtor_noexcept.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/dtor_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct throwing_alloc
 std::string s;
 std::wstring ws;
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::string C;
@@ -49,4 +48,6 @@ int main()
         static_assert(!std::is_nothrow_destructible<C>::value, "");
     }
 #endif // _LIBCPP_VERSION
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp b/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp
index 3665e23a7..9e31d3e6f 100644
--- a/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/implicit_deduction_guides.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ using BStr = std::basic_string<T, std::char_traits<T>, Alloc>;
 // (13) basic_string(initializer_list<CharT>, A const& = A())
 // (14) basic_string(BSV, A const& = A())
 // (15) basic_string(const T&, size_type, size_type, A const& = A())
-int main()
+int main(int, char**)
 {
   using TestSizeT = test_allocator<char>::size_type;
   { // Testing (1)
@@ -314,4 +313,6 @@ int main()
     ASSERT_SAME_TYPE(decltype(w), ExpectW);
     assert(w == L"cd");
   }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp b/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp
index 3007b9e8f..a106203d4 100644
--- a/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s = {'a', 'b', 'c'};
@@ -41,4 +40,6 @@ int main()
         s = {L'a', L'b', L'c'};
         assert(s == L"abc");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp b/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp
index 20279c853..dcb9bb911 100644
--- a/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s;
@@ -31,4 +30,6 @@ int main()
         s = {'a', 'b', 'c'};
         assert(s == "abc");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp b/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
index e7fefacc0..042018cb5 100644
--- a/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ test(It first, It last, const A& a)
     assert(s2.capacity() >= s2.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -117,4 +116,6 @@ int main()
     test(input_iterator<const char*>(s), input_iterator<const char*>(s+50), A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp b/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp
index 9c2a3201f..57fd550ac 100644
--- a/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp
+++ b/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ class NotAnItertor {};
 template <typename T>
 struct NotAnAllocator { typedef T value_type; };
 
-int main()
+int main(int, char**)
 {
     { // Not an iterator at all
     std::basic_string s1{NotAnItertor{}, NotAnItertor{}, std::allocator<char>{}}; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'basic_string'}}
@@ -53,4 +52,6 @@ int main()
     std::basic_string s1{s, s+10, NotAnAllocator<wchar_t>{}}; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'basic_string'}}
     }
 
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp b/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp
index 815b5600d..44daab4fc 100644
--- a/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@
 #include "../input_iterator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     const char* s = "12345678901234";
@@ -90,4 +89,6 @@ int main()
     assert(s1.size() == 10);
     assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/move.pass.cpp b/test/std/strings/basic.string/string.cons/move.pass.cpp
index 9ed244406..729c8e806 100644
--- a/test/std/strings/basic.string/string.cons/move.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(S s0)
     assert(s2.get_allocator() == s1.get_allocator());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -49,4 +48,6 @@ int main()
     test(S("1", A()));
     test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp b/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp
index bb7bdcd14..63e349e71 100644
--- a/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(S s0, const typename S::allocator_type& a)
 }
 
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -75,4 +74,6 @@ int main()
     test(S("1"), A());
     test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A());
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp b/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
index ad9ed36d3..2a00898c1 100644
--- a/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ struct some_alloc3
     typedef std::false_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::string C;
@@ -94,4 +93,6 @@ int main()
         static_assert(!std::is_nothrow_move_assignable<C>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp b/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp
index 006b5b9b4..9684fe738 100644
--- a/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(S s1, S s2)
     assert(s1.capacity() >= s1.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -71,4 +70,6 @@ int main()
            "1234567890123456789012345678901234567890123456789012345678901234567890"),
          S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp b/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp
index e0e4a4ff3..ee839cf26 100644
--- a/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::string C;
@@ -40,4 +39,6 @@ int main()
         static_assert( std::is_nothrow_move_constructible<C>::value, "");
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp b/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp
index d9d451dc7..d67f1231f 100644
--- a/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ test(const charT* s, const A& a)
     assert(s2.capacity() >= s2.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -86,4 +85,6 @@ int main()
     test("123456798012345679801234567980123456798012345679801234567980", A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp b/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp
index 506ab9374..4a885485b 100644
--- a/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(S s1, const typename S::value_type* s2)
     assert(s1.capacity() >= s1.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -70,4 +69,6 @@ int main()
          "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp b/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp
index 6d660fd10..75ad883fc 100644
--- a/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ test(const charT* s, unsigned n, const A& a)
     assert(s2.capacity() >= s2.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -91,4 +90,6 @@ int main()
     assert(s == "a");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp b/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp
index 2adf0049a..d50997191 100644
--- a/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -81,7 +80,7 @@ test(Tp n, Tp c, const A& a)
     assert(s2.capacity() >= s2.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -121,4 +120,6 @@ int main()
     test(static_cast<char>(100), static_cast<char>(65), A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/string_view.fail.cpp b/test/std/strings/basic.string/string.cons/string_view.fail.cpp
index 3d3bf4178..61d5b3db4 100644
--- a/test/std/strings/basic.string/string.cons/string_view.fail.cpp
+++ b/test/std/strings/basic.string/string.cons/string_view.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 
 void foo ( const string &s ) {}
 
-int main()
+int main(int, char**)
 {
     std::string_view sv = "ABCDE";
     foo(sv);    // requires implicit conversion from string_view to string
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/string_view.pass.cpp b/test/std/strings/basic.string/string.cons/string_view.pass.cpp
index 78ceae70e..b423c327d 100644
--- a/test/std/strings/basic.string/string.cons/string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ test(std::basic_string_view<charT> sv, const A& a)
   }
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -108,4 +107,6 @@ int main()
     test(SV("123456798012345679801234567980123456798012345679801234567980"), A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp b/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp
index 1d400b79b..942d990ee 100644
--- a/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(S s1, SV sv)
     assert(s1.capacity() >= s1.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -71,4 +70,6 @@ int main()
          SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/string_view_deduction.fail.cpp b/test/std/strings/basic.string/string.cons/string_view_deduction.fail.cpp
index b2fece8da..62ce16eca 100644
--- a/test/std/strings/basic.string/string.cons/string_view_deduction.fail.cpp
+++ b/test/std/strings/basic.string/string.cons/string_view_deduction.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,10 +31,12 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
     std::string_view sv = "12345678901234";
     std::basic_string s1{sv, 23}; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'basic_string'}}
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp b/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp
index a1f3c4b51..b3adc4146 100644
--- a/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@
 #include "../input_iterator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string_view sv = "12345678901234";
@@ -104,4 +103,6 @@ int main()
     assert(s1.size() == sv.size());
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.fail.cpp b/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.fail.cpp
index 17cb7dd16..cff605677 100644
--- a/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.fail.cpp
+++ b/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,10 +37,12 @@
 #include <cassert>
 #include <cstddef>
 
-int main()
+int main(int, char**)
 {
     {
     std::string_view sv = "12345678901234";
     std::basic_string s1{sv, 0, 4, 23}; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'basic_string'}}
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp b/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp
index fd9684e1f..983ab78e4 100644
--- a/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@
 #include "../input_iterator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::string_view sv = "12345678901234";
@@ -108,4 +107,6 @@ int main()
     assert(s1.size() == 4);
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.cons/substr.pass.cpp b/test/std/strings/basic.string/string.cons/substr.pass.cpp
index 13a9a4b96..44f29beec 100644
--- a/test/std/strings/basic.string/string.cons/substr.pass.cpp
+++ b/test/std/strings/basic.string/string.cons/substr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test2583()
 #endif
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -225,4 +224,6 @@ int main()
     test2583();
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp b/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp
index 6091e0c06..e2afe0420 100644
--- a/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp
+++ b/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -31,4 +30,6 @@ int main()
     assert ( s2.ends_with('e'));
     assert (!s2.ends_with('x'));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp b/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp
index b1f5fcd50..a4f8b1aa3 100644
--- a/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp
+++ b/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -60,4 +59,6 @@ int main()
     assert (!sNot.ends_with("abcde"));
     assert ( sNot.ends_with("def"));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp b/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp
index 4bbd4bc86..cbfffcfce 100644
--- a/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -69,4 +68,6 @@ int main()
     assert (!sNot.ends_with(sv5));
     assert ( sNot.ends_with(svNot));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/begin.pass.cpp b/test/std/strings/basic.string/string.iterators/begin.pass.cpp
index ea811113d..fbae9fab7 100644
--- a/test/std/strings/basic.string/string.iterators/begin.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/begin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(S s)
     assert(b == cb);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -45,4 +44,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp b/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp
index fb4b4bdc3..9886d56bb 100644
--- a/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(const S& s)
     assert(cb == s.begin());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -42,4 +41,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/cend.pass.cpp b/test/std/strings/basic.string/string.iterators/cend.pass.cpp
index 9ee56be78..1a3d30775 100644
--- a/test/std/strings/basic.string/string.iterators/cend.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/cend.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& s)
     assert(ce == s.end());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -38,4 +37,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp b/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp
index 90988a39a..687c34368 100644
--- a/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(const S& s)
     assert(cb == s.rbegin());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -42,4 +41,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/crend.pass.cpp b/test/std/strings/basic.string/string.iterators/crend.pass.cpp
index bb383787f..86aaad699 100644
--- a/test/std/strings/basic.string/string.iterators/crend.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/crend.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& s)
     assert(ce == s.rend());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -38,4 +37,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/db_iterators_2.pass.cpp b/test/std/strings/basic.string/string.iterators/db_iterators_2.pass.cpp
index e46368c77..469632394 100644
--- a/test/std/strings/basic.string/string.iterators/db_iterators_2.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/db_iterators_2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -45,8 +44,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.iterators/db_iterators_3.pass.cpp b/test/std/strings/basic.string/string.iterators/db_iterators_3.pass.cpp
index 3ed15d7c0..7dbbbbb4c 100644
--- a/test/std/strings/basic.string/string.iterators/db_iterators_3.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/db_iterators_3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -45,8 +44,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.iterators/db_iterators_4.pass.cpp b/test/std/strings/basic.string/string.iterators/db_iterators_4.pass.cpp
index 85ea2201f..1a46f86c2 100644
--- a/test/std/strings/basic.string/string.iterators/db_iterators_4.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/db_iterators_4.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string C;
@@ -47,8 +46,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.iterators/db_iterators_5.pass.cpp b/test/std/strings/basic.string/string.iterators/db_iterators_5.pass.cpp
index 9702090e4..77caf1b81 100644
--- a/test/std/strings/basic.string/string.iterators/db_iterators_5.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/db_iterators_5.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string C;
@@ -51,8 +50,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.iterators/db_iterators_6.pass.cpp b/test/std/strings/basic.string/string.iterators/db_iterators_6.pass.cpp
index e42ba4cf1..126c3661c 100644
--- a/test/std/strings/basic.string/string.iterators/db_iterators_6.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/db_iterators_6.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string C;
@@ -49,8 +48,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.iterators/db_iterators_7.pass.cpp b/test/std/strings/basic.string/string.iterators/db_iterators_7.pass.cpp
index 69a682142..f1083a439 100644
--- a/test/std/strings/basic.string/string.iterators/db_iterators_7.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/db_iterators_7.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string C;
@@ -49,8 +48,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.iterators/db_iterators_8.pass.cpp b/test/std/strings/basic.string/string.iterators/db_iterators_8.pass.cpp
index 5472773e6..c69f8ca4b 100644
--- a/test/std/strings/basic.string/string.iterators/db_iterators_8.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/db_iterators_8.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string C;
@@ -45,8 +44,10 @@ int main()
 
 #else
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
 #endif
diff --git a/test/std/strings/basic.string/string.iterators/end.pass.cpp b/test/std/strings/basic.string/string.iterators/end.pass.cpp
index 3ad60269b..86b00a370 100644
--- a/test/std/strings/basic.string/string.iterators/end.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ test(S s)
     assert(static_cast<std::size_t>(ce - cs.begin()) == cs.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -48,4 +47,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/iterators.pass.cpp b/test/std/strings/basic.string/string.iterators/iterators.pass.cpp
index 8bc6e4fb2..08448b1fd 100644
--- a/test/std/strings/basic.string/string.iterators/iterators.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/iterators.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     { // N3644 testing
         typedef std::string C;
@@ -84,4 +83,6 @@ int main()
         assert ( !(ii1 != ii2 ));
         assert ( !(ii1 != cii ));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp b/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp
index 698d613ca..479584c37 100644
--- a/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(S s)
     assert(b == cb);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -45,4 +44,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.iterators/rend.pass.cpp b/test/std/strings/basic.string/string.iterators/rend.pass.cpp
index 93c47e6bb..9b54058a6 100644
--- a/test/std/strings/basic.string/string.iterators/rend.pass.cpp
+++ b/test/std/strings/basic.string/string.iterators/rend.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ test(S s)
     assert(static_cast<std::size_t>(ce - cs.rbegin()) == cs.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -48,4 +47,6 @@ int main()
     test(S("123"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/nothing_to_do.pass.cpp b/test/std/strings/basic.string/string.modifiers/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/strings/basic.string/string.modifiers/nothing_to_do.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp
index fcd18b7f0..437524063 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ test_npos(S s, SV sv, typename S::size_type pos, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -197,4 +196,6 @@ int main()
     s.append(sv, 0, std::string::npos);
     assert(s == "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
index d30ca4469..da74fb4e0 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s("123");
@@ -32,4 +31,6 @@ int main()
         s.append({'a', 'b', 'c'});
         assert(s == "123abc");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
index 7ed554039..8f280e828 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ test_exceptions(S s, It first, It last)
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -220,4 +219,6 @@ int main()
     s.append(MoveIt(It(std::begin(p))), MoveIt(It(std::end(p) - 1)));
     assert(s == "ABCD");
   }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp
index 823905df4..eba693d0e 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S s, const typename S::value_type* str, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -77,4 +76,6 @@ int main()
     s_long.append(s_long.c_str());
     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
index f09ec682e..c214ab7c2 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(S s, const typename S::value_type* str, typename S::size_type n, S expected
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -86,4 +85,6 @@ int main()
     s_long.append(s_long.data(), s_long.size());
     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
index 38b68aa69..f1b34ad6c 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(S s, typename S::value_type c, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -57,4 +56,6 @@ int main()
     s.push_back(vl);
     s.push_back(vl);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp
index 1610ab5a1..c40624892 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S s, typename S::size_type n, typename S::value_type c, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -61,4 +60,6 @@ int main()
     test(S("12345678901234567890"), 10, 'a', S("12345678901234567890aaaaaaaaaa"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp
index b3704268a..5e551d7a2 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S s, S str, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -86,4 +85,6 @@ int main()
     assert(s == "a");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp
index 588c15ab8..37985d001 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ test_npos(S s, S str, typename S::size_type pos, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -134,4 +133,6 @@ int main()
     test_npos(S(), S("12345"), 5, S(""));
     test_npos(S(), S("12345"), 6, S("not happening"));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp
index 2d85b15fa..d0fb1cc33 100644
--- a/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(S s, SV sv, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -80,4 +79,6 @@ int main()
          S("1234567890123456789012345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp
index bf51d816e..044b37240 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ test_npos(S s, SV sv, typename S::size_type pos, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -192,4 +191,6 @@ int main()
     s.assign(sv, 0, std::string::npos);
     assert(s == "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp
index a2114cf5a..692b84b55 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s("123");
@@ -32,4 +31,6 @@ int main()
         s.assign({'a', 'b', 'c'});
         assert(s == "abc");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
index cb83f25d7..c03b5efdf 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test_exceptions(S s, It first, It last)
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -205,4 +204,6 @@ int main()
     s.assign(p, p + 4);
     assert(s == "ABCD");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp
index b592455a3..325c354c5 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S s, const typename S::value_type* str, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -75,4 +74,6 @@ int main()
     s_long.assign(s_long.c_str() + 30);
     assert(s_long == "nsectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp
index 70b00619a..5d3fe2621 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(S s, const typename S::value_type* str, typename S::size_type n, S expected
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -86,4 +85,6 @@ int main()
     s_long.assign(s_long.data() + 2, 8 );
     assert(s_long == "rem ipsu");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp
index 6b89df98d..ac26f369d 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(S s, S str, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -78,4 +77,6 @@ int main()
          S("12345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp
index a899e0dbe..4e5ecad2e 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S s, typename S::size_type n, typename S::value_type c, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -61,4 +60,6 @@ int main()
     test(S("12345678901234567890"), 10, 'a', S(10, 'a'));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
index 788512ba3..fae45c80d 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ testAlloc(S s, S str, const typename S::allocator_type& a)
     assert(s.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -114,4 +113,6 @@ int main()
     static_assert(noexcept(S().assign(S())), "");  // LWG#2063
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp
index 2ad37f311..8e11b150e 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ test_npos(S s, S str, typename S::size_type pos, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -134,4 +133,6 @@ int main()
     test_npos(S(), S("12345"), 5, S(""));
     test_npos(S(), S("12345"), 6, S("not happening"));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
index e56b094a3..2d1158e41 100644
--- a/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ testAlloc(S s, SV sv, const typename S::allocator_type& a)
     assert(s.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -102,4 +101,6 @@ int main()
     testAlloc(S(), SV("12345678901234567890"), min_allocator<char>());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp
index 664d2049b..778fb70c0 100644
--- a/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ test(S str, typename S::value_type* s, typename S::size_type n,
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -178,4 +177,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), s, 21, 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
index 31add9df2..12b13d738 100644
--- a/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(S s, typename S::difference_type pos, S expected)
     assert(i - s.begin() == pos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -63,4 +62,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), 19, S("abcdefghijklmnopqrs"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
index 858d3754e..a5e6d1251 100644
--- a/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(S s, typename S::difference_type pos, typename S::difference_type n, S expe
     assert(i - s.begin() == pos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -148,4 +147,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
index 8424b5429..e6490abcd 100644
--- a/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S s, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -43,4 +42,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrs"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
index 2c900bb31..88dace52f 100644
--- a/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -89,7 +88,7 @@ test(S s, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -299,4 +298,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S(""));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp
index 6bd9b7e01..ef6144dad 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(S& s, typename S::const_iterator p, typename S::value_type c, S expected)
         assert(i == p);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -73,4 +72,6 @@ int main()
     test(s, s.begin()+6, 'C', S("a567ABC1432dcb"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp
index c5b7cbf9d..6dd043c6d 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s("123456");
@@ -34,4 +33,6 @@ int main()
         assert(i - s.begin() == 3);
         assert(s == "123abc456");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
index cb4b40f9e..6d4f1a668 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ test_exceptions(S s, typename S::difference_type pos, It first, It last)
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -219,4 +218,6 @@ int main()
     s.insert(s.begin(), MoveIt(It(std::begin(p))), MoveIt(It(std::end(p) - 1)));
     assert(s == "ABCD");
   }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp
index c9cd0c2c9..699b67924 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test(S s, typename S::difference_type pos, typename S::size_type n,
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -167,4 +166,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), 20, 20, '1', S("abcdefghijklmnopqrst11111111111111111111"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp
index e9476f48f..2b54b6720 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1730,7 +1729,7 @@ void test30()
     test_npos(S("abcdefghijklmnopqrst"), 10, SV("12345"), 6, S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -1839,4 +1838,6 @@ int main()
     assert(s == "");
     s.clear();
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp
index b4505a4c1..24859fa8b 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test(S s, typename S::size_type pos, const typename S::value_type* str, S expect
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -234,4 +233,6 @@ int main()
     s_long.insert(0, s_long.c_str());
     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp
index ee5991c15..3dbd93f1d 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ test(S s, typename S::size_type pos, const typename S::value_type* str,
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -715,4 +714,6 @@ int main()
     s_long.insert(0, s_long.data(), s_long.size());
     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp
index a769604c6..dce8b7d7e 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ test(S s, typename S::size_type pos, typename S::size_type n,
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -219,4 +218,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), 21, 20, '1', S("can't happen"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp
index 4c3a87248..93bc3f6d9 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test(S s, typename S::size_type pos, S str, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -227,4 +226,6 @@ int main()
     assert(s == "a");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp
index 67ba7ec10..18a688a5d 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1728,7 +1727,7 @@ void test30()
     test_npos(S("abcdefghijklmnopqrst"), 10, S("12345"), 6, S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -1800,4 +1799,6 @@ int main()
     test30<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp
index 970cbcb17..129389a9a 100644
--- a/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test(S s, typename S::size_type pos, SV sv, S expected)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -236,4 +235,6 @@ int main()
     s_long.insert(0, s_long.c_str());
     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp
index f39ed036e..2cc4496eb 100644
--- a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(S s, typename S::value_type str, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -44,4 +43,6 @@ int main()
     test(S("12345678901234567890"), 'a', S("12345678901234567890a"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp
index 5b32af951..689389eb7 100644
--- a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s("123");
@@ -31,4 +30,6 @@ int main()
         s += {'a', 'b', 'c'};
         assert(s == "123abc");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp
index c19fd2909..a9edf17be 100644
--- a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(S s, const typename S::value_type* str, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -76,4 +75,6 @@ int main()
          S("1234567890123456789012345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp
index bbe385015..f81d4bec0 100644
--- a/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S s, S str, S expected)
     assert(s == expected);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -86,4 +85,6 @@ int main()
     assert(s == "a");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp
index 2a705ebf4..3df49f325 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s("123def456");
@@ -31,4 +30,6 @@ int main()
         s.replace(s.cbegin() + 3, s.cbegin() + 6, {'a', 'b', 'c'});
         assert(s == "123abc456");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
index f8126bcaf..47a1193be 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -964,7 +963,7 @@ void test8()
     test(S("abcdefghijklmnopqrst"), 20, 0, str, str+20, S("abcdefghijklmnopqrst12345678901234567890"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -1037,4 +1036,6 @@ int main()
     s.replace(s.begin(), s.end(), p, p + 4);
     assert(s == "EFGH");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp
index a7d6a6e3c..8ed1dc3df 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -266,7 +265,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 20, 0, "12345678901234567890", S("abcdefghijklmnopqrst12345678901234567890"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -298,4 +297,6 @@ int main()
     s_long.replace(s_long.begin(), s_long.begin(), s_long.c_str());
     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp
index 6c68b1566..39b518c91 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -944,7 +943,7 @@ void test8()
     test(S("abcdefghijklmnopqrst"), 20, 0, "12345678901234567890", 20, S("abcdefghijklmnopqrst12345678901234567890"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -988,4 +987,6 @@ int main()
     s_long.replace(s_long.begin(), s_long.begin(), s_long.data(), s_long.size());
     assert(s_long == "Lorem ipsum dolor sit amet, consectetur/Lorem ipsum dolor sit amet, consectetur/");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp
index 4dbc8ab1f..e60c69f7a 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -266,7 +265,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 20, 0, 20, '3', S("abcdefghijklmnopqrst33333333333333333333"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -282,4 +281,6 @@ int main()
     test2<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp
index f5f31254e..700873661 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -265,7 +264,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 20, 0, S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -290,4 +289,6 @@ int main()
     assert(s == "a");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
index ec81001df..0acf82868 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -265,7 +264,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 20, 0, SV("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -283,4 +282,6 @@ int main()
     test2<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp
index dbf5f5b64..2348747de 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -5870,7 +5869,7 @@ void test55()
     test_npos(S("abcdefghij"), 9, 2, SV("12345"), 6, S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -6026,4 +6025,6 @@ int main()
     s.replace(0, 4, arr, 0, std::string::npos);    // calls replace(pos1, n1, string("IJKL"), pos, npos)
     assert(s == "IJKL");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp
index d09c9c2ef..a6a6c7d9d 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -364,7 +363,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 21, 0, "12345678901234567890", S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -380,4 +379,6 @@ int main()
     test2<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp
index 5c751285c..e30566707 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1298,7 +1297,7 @@ void test11()
     test(S("abcdefghijklmnopqrst"), 21, 0, "12345678901234567890", 20, S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -1332,4 +1331,6 @@ int main()
     test11<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp
index 75745dab6..7d37e1075 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -365,7 +364,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 21, 0, 20, '2', S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -381,4 +380,6 @@ int main()
     test2<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp
index 88982e098..c0fad33a3 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -363,7 +362,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 21, 0, S("12345678901234567890"), S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -388,4 +387,6 @@ int main()
     assert(s == "a");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp
index b49b6f987..3fa32699f 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -5860,7 +5859,7 @@ void test55()
     test_npos(S("abcdefghij"), 9, 2, S("12345"), 6, S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -5982,4 +5981,6 @@ int main()
     test55<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
index 60ecd67f1..542220aea 100644
--- a/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -363,7 +362,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 21, 0, SV("12345678901234567890"), S("can't happen"));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -381,4 +380,6 @@ int main()
     test2<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp b/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp
index fe2ee1fa6..8fdf3fea9 100644
--- a/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp
+++ b/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(S s1, S s2)
     assert(s2 == s1_);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -74,4 +73,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("12345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/nothing_to_do.pass.cpp b/test/std/strings/basic.string/string.nonmembers/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/strings/basic.string/string.nonmembers/nothing_to_do.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp
index 6011ea158..8e663cb4f 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream in(" abc\n  def\n   ghij");
@@ -78,4 +77,6 @@ int main()
         assert(s == L"   ghij");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp
index 79852337a..b081b55c9 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream in(" abc*  def**   ghij");
@@ -90,4 +89,6 @@ int main()
         assert(s == L"   ghij");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp
index 5dbfe9d4d..b1511f211 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s("initial text");
@@ -46,4 +45,6 @@ int main()
         getline(std::wistringstream(L" abc*  def*   ghij"), s, L'*');
         assert(s == L" abc");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp
index 0c1fa8203..cf4772c43 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::string s("initial text");
@@ -46,4 +45,6 @@ int main()
         getline(std::wistringstream(L" abc\n  def\n   ghij"), s);
         assert(s == L" abc");
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp
index 30e7dc6c1..389701d1d 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::istringstream in("a bc defghij");
@@ -114,4 +113,6 @@ int main()
         assert(in.fail());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp
index 6489ddfca..b30fd5afa 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream out;
@@ -88,4 +87,6 @@ int main()
         assert(L"   " + s == out.str());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp
index a2e25196d..f644f2870 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ test(S s1, S s2)
     assert(s2 == s1_);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -76,4 +75,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("12345678901234567890"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp
index c8b784c24..3f6ce447c 100644
--- a/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string.special/swap_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ struct some_alloc2
     typedef std::true_type is_always_equal;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::string C;
@@ -82,4 +81,6 @@ int main()
         static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp
index 6d39d025c..bf2cc8413 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x)
     assert((lhs != rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp
index 67d18b7a9..76e0abe23 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x)
     assert((lhs != rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp
index 27e97788c..30aeb501a 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const S& lhs, const S& rhs, bool x)
     assert((lhs != rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp
index 65649465d..5b01455e7 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& lhs, SV rhs, bool x)
     assert((lhs != rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp
index 88c758c7a..2d6957e34 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(SV lhs, const S& rhs, bool x)
     assert((lhs != rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
index 7bf7da890..9ab3c0611 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test1(typename S::value_type lhs, S&& rhs, const S& x) {
 }
 #endif
 
-int main() {
+int main(int, char**) {
   {
     typedef std::string S;
     test0('a', S(""), S("a"));
@@ -67,4 +66,6 @@ int main() {
     test1('a', S("12345678901234567890"), S("a12345678901234567890"));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
index 090707fd8..cf13fbb51 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test1(const typename S::value_type* lhs, S&& rhs, const S& x) {
 }
 #endif
 
-int main() {
+int main(int, char**) {
   {
     typedef std::string S;
     test0("", S(""), S(""));
@@ -128,4 +127,6 @@ int main() {
           S("abcdefghijklmnopqrst12345678901234567890"));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
index 9bc3a4d41..32411144d 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test1(S&& lhs, typename S::value_type rhs, const S& x) {
 }
 #endif
 
-int main() {
+int main(int, char**) {
   {
     typedef std::string S;
     test0(S(""), '1', S("1"));
@@ -67,4 +66,6 @@ int main() {
     test1(S("abcdefghijklmnopqrst"), '1', S("abcdefghijklmnopqrst1"));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
index a9aa92f37..4fec84829 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test1(S&& lhs, const typename S::value_type* rhs, const S& x) {
 }
 #endif
 
-int main() {
+int main(int, char**) {
   {
     typedef std::string S;
     test0(S(""), "", S(""));
@@ -127,4 +126,6 @@ int main() {
           S("abcdefghijklmnopqrst12345678901234567890"));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
index fbef64627..00aaf5cc0 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ void test3(S&& lhs, S&& rhs, const S& x) {
 
 #endif
 
-int main() {
+int main(int, char**) {
   {
     typedef std::string S;
     test0(S(""), S(""), S(""));
@@ -246,4 +245,6 @@ int main() {
           S("abcdefghijklmnopqrst12345678901234567890"));
   }
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp
index 19dd8bfbd..5db04b3a8 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x)
     assert((lhs == rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp
index f6e3ddec4..aa79e17d1 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x)
     assert((lhs == rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp
index c1d57b0bc..357a91fd9 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const S& lhs, const S& rhs, bool x)
     assert((lhs == rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp
index dec8f6f5a..06c16d070 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& lhs, SV rhs, bool x)
     assert((lhs == rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp
index 2cd808659..7ebdc0934 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(SV lhs, const S& rhs, bool x)
     assert((lhs == rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp
index 363e6d361..db28cd4d1 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x)
     assert((lhs > rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp
index 4b5f7c368..56521e916 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x)
     assert((lhs > rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp
index 01c7c5311..0cfafb809 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const S& lhs, const S& rhs, bool x)
     assert((lhs > rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp
index d9f5d7106..692fbd4fe 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& lhs, SV rhs, bool x)
     assert((lhs > rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp
index c685bab8f..f6a2fa555 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(SV lhs, const S& rhs, bool x)
     assert((lhs > rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp
index f4ab04d60..e868531a6 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x)
     assert((lhs >= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp
index 4042997f4..8aad50782 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x)
     assert((lhs >= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp
index cdcfc9d8d..f0ab16cbb 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const S& lhs, const S& rhs, bool x)
     assert((lhs >= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp
index 5b9671fca..c7eb3e3e4 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& lhs, SV rhs, bool x)
     assert((lhs >= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp
index 07c8282a7..b49c1348a 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(SV lhs, const S& rhs, bool x)
     assert((lhs >= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp
index e709aa4fb..1609c4d87 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x)
     assert((lhs < rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp
index 8e4f2fab1..079344bb8 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x)
     assert((lhs < rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp
index c14e92a00..586faa40f 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const S& lhs, const S& rhs, bool x)
     assert((lhs < rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp
index 8fef8e60a..79393def5 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& lhs, SV rhs, bool x)
     assert((lhs < rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp
index 80da8cd00..7e8b139c3 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(SV lhs, const S& rhs, bool x)
     assert((lhs < rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp
index acab3592e..cae9233df 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x)
     assert((lhs <= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp
index f0f540a49..07f9b3551 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x)
     assert((lhs <= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -66,4 +65,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp
index 208f96239..8d40f2f0a 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test(const S& lhs, const S& rhs, bool x)
     assert((lhs <= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp
index 97a9d7cc7..3df9e39cc 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(const S& lhs, SV rhs, bool x)
     assert((lhs <= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp
index f19a4aa0f..cb7b1a4c4 100644
--- a/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp
+++ b/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ test(SV lhs, const S& rhs, bool x)
     assert((lhs <= rhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -67,4 +66,6 @@ int main()
     test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/nothing_to_do.pass.cpp b/test/std/strings/basic.string/string.ops/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/strings/basic.string/string.ops/nothing_to_do.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp b/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp
index d6695b0b3..2677230c2 100644
--- a/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(const S& s)
         assert(T::eq(str[0], typename S::value_type()));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -49,4 +48,6 @@ int main()
     test(S("abcdefghijklmnopqrst"));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp b/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp
index 9b66cb004..6aa07302a 100644
--- a/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test_nonconst(S& s)
         assert(T::eq(str[0], typename S::value_type()));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -75,4 +74,6 @@ int main()
     S s4("abcdefghijklmnopqrst"); test_nonconst(s4);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp b/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp
index e50c61fb1..7edf5a88d 100644
--- a/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ test(const S& s, const typename S::allocator_type& a)
     assert(s.get_allocator() == a);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef test_allocator<char> A;
@@ -44,4 +43,6 @@ int main()
     test(S("abcdefghijklmnopqrst", A()), A());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
index 150973a7f..0af8ce02f 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(const S& s, const typename S::value_type* str, int x)
     assert(sign(s.compare(str)) == sign(x));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -74,4 +73,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp
index 94f7890dd..abab9879a 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -5841,7 +5840,7 @@ void test55()
     test_npos(S("abcde"), 0, 0, SV("abcdefghij"), 5, -5);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -5990,4 +5989,6 @@ int main()
 //  calls compare(size, size, string(arr), 0, npos)
     assert(s.compare(0, 4, arr, 0, std::string::npos) == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
index 55af081a7..4e77fc09c 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -362,7 +361,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -378,4 +377,6 @@ int main()
     test2<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
index 2fcecc755..75efbadcc 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1295,7 +1294,7 @@ void test11()
     test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 20, 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -1329,4 +1328,6 @@ int main()
     test11<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
index be730cbc1..55fd82371 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -361,7 +360,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -384,4 +383,6 @@ int main()
     assert(s.compare(0, 1, {"abc", 1}) < 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
index 590a15188..05ba6ac82 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -5837,7 +5836,7 @@ void test55()
     test_npos(S("abcde"), 0, 0, S("abcdefghij"), 5, -5);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -5959,4 +5958,6 @@ int main()
     test55<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp
index 53114f37c..94c73ab31 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -362,7 +361,7 @@ void test2()
     test(S("abcdefghijklmnopqrst"), 21, 0, SV("abcdefghijklmnopqrst"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -380,4 +379,6 @@ int main()
     test2<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
index 80d579e30..279ae3075 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(const S& s, const S& str, int x)
     assert(sign(s.compare(str)) == sign(x));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -82,4 +81,6 @@ int main()
     assert(s.compare({"abc", 1}) < 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp b/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp
index 8f0d48884..2abc7fc1a 100644
--- a/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(const S& s, SV sv, int x)
     assert(sign(s.compare(sv)) == sign(x));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -76,4 +75,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp
index 945f88054..7bada8446 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -99,4 +98,6 @@ int main()
     test(S("laenfsbridchgotmkqpj"), 'q', 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp
index 0c239b323..bd20ea1bb 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -155,4 +154,6 @@ int main()
     test1<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp
index 0296e2cbe..46c5511d9 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -366,7 +365,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -384,4 +383,6 @@ int main()
     test3<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp
index 4ce343351..7f12ab1ba 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -162,4 +161,6 @@ int main()
     assert(s.find_first_not_of({"abc", 1}) == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp
index fb69f8b34..54ce737ec 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), SV("htaobedqikfplcgjsmrn"), S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -156,4 +155,6 @@ int main()
     test1<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp
index 494a1181f..da630f07e 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -95,4 +94,6 @@ int main()
     test(S("laenfsbridchgotmkqpj"), 'e', 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp
index b2a05b29f..2162ea14c 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -155,4 +154,6 @@ int main()
     test1<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp
index 8b7f7b4a5..e0bb0f2fb 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -366,7 +365,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -384,4 +383,6 @@ int main()
     test3<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp
index 105c2a6db..1ae2123c3 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -162,4 +161,6 @@ int main()
     assert(s.find_first_of({"abc", 1}) == std::string::npos);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp
index 05925afaa..8cd272408 100644
--- a/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), SV("htaobedqikfplcgjsmrn"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -156,4 +155,6 @@ int main()
     test1<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp
index 3212389bb..fd77eb89d 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -95,4 +94,6 @@ int main()
     test(S("laenfsbridchgotmkqpj"), 'i', 19);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp
index 7dc75184f..1234ccb4d 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -155,4 +154,6 @@ int main()
     test1<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp
index 2024266df..4c07f4d61 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -366,7 +365,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -384,4 +383,6 @@ int main()
     test3<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp
index 57fab60e7..8232612c1 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -162,4 +161,6 @@ int main()
     assert(s.find_last_not_of({"abc", 1}) == s.size() - 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp
index 7e46ff74a..da5054b7d 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), SV("htaobedqikfplcgjsmrn"), S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -156,4 +155,6 @@ int main()
 //     test1<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp
index e0bbd82f6..4292b1eb8 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -95,4 +94,6 @@ int main()
     test(S("laenfsbridchgotmkqpj"), 'm', 15);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp
index c3d6044c4..0b86a10c5 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 19);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -155,4 +154,6 @@ int main()
     test1<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp
index 42a076aa4..9c5f670a9 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -366,7 +365,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, 19);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -384,4 +383,6 @@ int main()
     test3<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp
index b6b5b8f12..f3ddb468d 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 19);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -162,4 +161,6 @@ int main()
     assert(s.find_last_of({"abc", 1}) == std::string::npos);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp
index fb8ca3441..ccf181faa 100644
--- a/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), SV("htaobedqikfplcgjsmrn"), 19);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -156,4 +155,6 @@ int main()
     test1<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp
index a084348b3..5700d0957 100644
--- a/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(0 <= x && x + 1 <= s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -95,4 +94,6 @@ int main()
     test(S("abcdeabcdeabcdeabcde"), 'c', 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp
index 0257e1259..6e7ae3d41 100644
--- a/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -147,7 +146,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -161,4 +160,6 @@ int main()
     test1<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp
index 9a380f729..fad750717 100644
--- a/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -366,7 +365,7 @@ void test3()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -384,4 +383,6 @@ int main()
     test3<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp
index 769b51c8d..e8a91dd1f 100644
--- a/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -162,4 +161,6 @@ int main()
     assert(s.find({"abc", 1}) == std::string::npos);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp
index 096f47e2a..c1e78af10 100644
--- a/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -156,4 +155,6 @@ int main()
     test1<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp
index c53d77f34..46ced3123 100644
--- a/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x + 1 <= s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -95,4 +94,6 @@ int main()
     test(S("abcdeabcdeabcdeabcde"), 'b', 16);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp
index ebcb0ea38..715b5e578 100644
--- a/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -148,7 +147,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -162,4 +161,6 @@ int main()
     test1<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp
index e8d0c6b73..e96700952 100644
--- a/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -366,7 +365,7 @@ void test3()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -384,4 +383,6 @@ int main()
     test3<S>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp
index d7908ad85..74cfb02ee 100644
--- a/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -162,4 +161,6 @@ int main()
     assert(s.rfind({"abc", 1}) == std::string::npos);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp b/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp
index 230c4556c..ea4f9c205 100644
--- a/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -156,4 +155,6 @@ int main()
     test1<S, SV>();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp b/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp
index f94739eb4..27af66e06 100644
--- a/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp
+++ b/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test(const S& s, typename S::size_type pos, typename S::size_type n)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -174,4 +173,6 @@ int main()
     test(S("dplqartnfgejichmoskb"), 21, 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.require/contiguous.pass.cpp b/test/std/strings/basic.string/string.require/contiguous.pass.cpp
index 1cc8e96e8..be090c90e 100644
--- a/test/std/strings/basic.string/string.require/contiguous.pass.cpp
+++ b/test/std/strings/basic.string/string.require/contiguous.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ void test_contiguous ( const C &c )
         assert ( *(c.begin() + static_cast<typename C::difference_type>(i)) == *(std::addressof(*c.begin()) + i));
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -50,4 +49,6 @@ int main()
     test_contiguous(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp b/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp
index 4be35a765..8eae5f7c8 100644
--- a/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp
+++ b/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -31,4 +30,6 @@ int main()
     assert ( s2.starts_with('a'));
     assert (!s2.starts_with('x'));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp b/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp
index 5dec2156e..412ed574c 100644
--- a/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp
+++ b/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -59,4 +58,6 @@ int main()
     assert (!sNot.starts_with("abcde"));
     assert ( sNot.starts_with("def"));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp b/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp
index d542d3d79..c951b4c73 100644
--- a/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp
+++ b/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string S;
@@ -69,4 +68,6 @@ int main()
     assert (!sNot.starts_with(sv5));
     assert ( sNot.starts_with(svNot));
     }
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/test_traits.h b/test/std/strings/basic.string/test_traits.h
index f635b1d75..c45f56eba 100644
--- a/test/std/strings/basic.string/test_traits.h
+++ b/test/std/strings/basic.string/test_traits.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/strings/basic.string/traits_mismatch.fail.cpp b/test/std/strings/basic.string/traits_mismatch.fail.cpp
index 1d54238ae..47524d2c3 100644
--- a/test/std/strings/basic.string/traits_mismatch.fail.cpp
+++ b/test/std/strings/basic.string/traits_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <string>
 
-int main()
+int main(int, char**)
 {
     std::basic_string<char, std::char_traits<wchar_t>> s;
+
+  return 0;
 }
diff --git a/test/std/strings/basic.string/types.pass.cpp b/test/std/strings/basic.string/types.pass.cpp
index a6832a158..5aa2c7cf8 100644
--- a/test/std/strings/basic.string/types.pass.cpp
+++ b/test/std/strings/basic.string/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ test()
     static_assert(S::npos == -1, "");
 }
 
-int main()
+int main(int, char**)
 {
     test<test_traits<char>, test_allocator<char> >();
     test<std::char_traits<wchar_t>, std::allocator<wchar_t> >();
@@ -82,4 +81,6 @@ int main()
 #if TEST_STD_VER >= 11
     test<std::char_traits<char>, min_allocator<char> >();
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/c.strings/cctype.pass.cpp b/test/std/strings/c.strings/cctype.pass.cpp
index 695c5e40d..c26c1e6a2 100644
--- a/test/std/strings/c.strings/cctype.pass.cpp
+++ b/test/std/strings/c.strings/cctype.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@
 #error toupper defined
 #endif
 
-int main()
+int main(int, char**)
 {
 
     ASSERT_SAME_TYPE(int, decltype(std::isalnum(0)));
@@ -103,4 +102,6 @@ int main()
     assert( std::isxdigit('a'));
     assert( std::tolower('A') == 'a');
     assert( std::toupper('a') == 'A');
+
+  return 0;
 }
diff --git a/test/std/strings/c.strings/cstring.pass.cpp b/test/std/strings/c.strings/cstring.pass.cpp
index 22952e0f2..c8ee2789d 100644
--- a/test/std/strings/c.strings/cstring.pass.cpp
+++ b/test/std/strings/c.strings/cstring.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #error NULL not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::size_t s = 0;
     void* vp = 0;
@@ -61,4 +60,6 @@ int main()
     ASSERT_SAME_TYPE(const char*, decltype(std::strrchr(cpc, 0)));
     ASSERT_SAME_TYPE(const char*, decltype(std::strstr(cpc, cpc)));
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/c.strings/cuchar.pass.cpp b/test/std/strings/c.strings/cuchar.pass.cpp
index f14eda511..4271503d4 100644
--- a/test/std/strings/c.strings/cuchar.pass.cpp
+++ b/test/std/strings/c.strings/cuchar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -15,6 +14,8 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/c.strings/cwchar.pass.cpp b/test/std/strings/c.strings/cwchar.pass.cpp
index 116da936e..667910bc1 100644
--- a/test/std/strings/c.strings/cwchar.pass.cpp
+++ b/test/std/strings/c.strings/cwchar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 #error WEOF not defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::mbstate_t mb = {};
     std::size_t s = 0;
@@ -129,4 +128,6 @@ int main()
     ASSERT_SAME_TYPE(int,                decltype(std::vwprintf(L"", va)));
     ASSERT_SAME_TYPE(int,                decltype(std::wprintf(L"")));
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/c.strings/cwctype.pass.cpp b/test/std/strings/c.strings/cwctype.pass.cpp
index 14f730b15..3bcda1a47 100644
--- a/test/std/strings/c.strings/cwctype.pass.cpp
+++ b/test/std/strings/c.strings/cwctype.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -91,7 +90,7 @@
 #error wctrans defined
 #endif
 
-int main()
+int main(int, char**)
 {
     std::wint_t w = 0;
     ASSERT_SAME_TYPE(int, decltype(std::iswalnum(w)));
@@ -114,4 +113,6 @@ int main()
     ASSERT_SAME_TYPE(std::wint_t,    decltype(std::towupper(w)));
     ASSERT_SAME_TYPE(std::wint_t,    decltype(std::towctrans(w, std::wctrans_t())));
     ASSERT_SAME_TYPE(std::wctrans_t, decltype(std::wctrans("")));
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.require/nothing_to_do.pass.cpp b/test/std/strings/char.traits/char.traits.require/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/strings/char.traits/char.traits.require/nothing_to_do.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.require/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign2.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign2.pass.cpp
index 311064ceb..c60e6db9f 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign2.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     char c = '\0';
     std::char_traits<char>::assign(c, 'a');
@@ -37,4 +36,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp
index a9eb6c961..e2cbe3d5d 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/assign3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     char s2[3] = {0};
     assert(std::char_traits<char>::assign(s2, 3, char(5)) == s2);
@@ -24,4 +23,6 @@ int main()
     assert(s2[1] == char(5));
     assert(s2[2] == char(5));
     assert(std::char_traits<char>::assign(NULL, 0, char(5)) == NULL);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/compare.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/compare.pass.cpp
index 71ab24898..4926b6296 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/compare.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char>::compare("", "", 0) == 0);
     assert(std::char_traits<char>::compare(NULL, NULL, 0) == 0);
@@ -54,4 +53,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp
index 179df9e19..3a8e3bda6 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     char s1[] = {1, 2, 3};
     char s2[3] = {0};
@@ -26,4 +25,6 @@ int main()
     assert(s2[2] == char(3));
     assert(std::char_traits<char>::copy(NULL, s1, 0) == NULL);
     assert(std::char_traits<char>::copy(s1, NULL, 0) == s1);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eof.pass.cpp
index 39fba6b1c..0ea0995da 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char>::eof() == EOF);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq.pass.cpp
index 8a2f2964c..f0cef792d 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char>::eq('a', 'a'));
     assert(!std::char_traits<char>::eq('a', 'A'));
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq_int_type.pass.cpp
index bdaf431db..0fbb4389c 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/eq_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert( std::char_traits<char>::eq_int_type('a', 'a'));
     assert(!std::char_traits<char>::eq_int_type('a', 'A'));
     assert(!std::char_traits<char>::eq_int_type(std::char_traits<char>::eof(), 'A'));
     assert( std::char_traits<char>::eq_int_type(std::char_traits<char>::eof(),
                                                 std::char_traits<char>::eof()));
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/find.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/find.pass.cpp
index 714202e25..974500840 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/find.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     char s1[] = {1, 2, 3};
     assert(std::char_traits<char>::find(s1, 3, char(1)) == s1);
@@ -43,4 +42,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/length.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/length.pass.cpp
index d93e49987..8be4e0a70 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/length.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 #endif
 
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char>::length("") == 0);
     assert(std::char_traits<char>::length("a") == 1);
@@ -39,4 +38,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/lt.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/lt.pass.cpp
index 4cf2b0adc..e62090cf4 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/lt.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert( std::char_traits<char>::lt('\0', 'A'));
     assert(!std::char_traits<char>::lt('A', '\0'));
@@ -30,4 +29,6 @@ int main()
 
     assert( std::char_traits<char>::lt(' ', 'A'));
     assert( std::char_traits<char>::lt('A', '~'));
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp
index 67f0216a2..ecbb61901 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     char s1[] = {1, 2, 3};
     assert(std::char_traits<char>::move(s1, s1+1, 2) == s1);
@@ -30,4 +29,6 @@ int main()
     assert(s1[2] == char(3));
     assert(std::char_traits<char>::move(NULL, s1, 0) == NULL);
     assert(std::char_traits<char>::move(s1, NULL, 0) == s1);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/not_eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/not_eof.pass.cpp
index 69800969a..1c37a7c2e 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/not_eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/not_eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char>::not_eof('a') == 'a');
     assert(std::char_traits<char>::not_eof('A') == 'A');
     assert(std::char_traits<char>::not_eof(0) == 0);
     assert(std::char_traits<char>::not_eof(std::char_traits<char>::eof()) !=
            std::char_traits<char>::eof());
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_char_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_char_type.pass.cpp
index 498abfa25..d8a957016 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_char_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_char_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char>::to_char_type('a') == 'a');
     assert(std::char_traits<char>::to_char_type('A') == 'A');
     assert(std::char_traits<char>::to_char_type(0) == 0);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_int_type.pass.cpp
index aa9594cfd..dd903f9e6 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/to_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char>::to_int_type('a') == 'a');
     assert(std::char_traits<char>::to_int_type('A') == 'A');
     assert(std::char_traits<char>::to_int_type(0) == 0);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/types.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/types.pass.cpp
index ff4a93af6..30d31ebc9 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/types.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,11 +19,13 @@
 #include <string>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::char_traits<char>::char_type, char>::value), "");
     static_assert((std::is_same<std::char_traits<char>::int_type, int>::value), "");
     static_assert((std::is_same<std::char_traits<char>::off_type, std::streamoff>::value), "");
     static_assert((std::is_same<std::char_traits<char>::pos_type, std::streampos>::value), "");
     static_assert((std::is_same<std::char_traits<char>::state_type, std::mbstate_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign2.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign2.pass.cpp
index e28f906c0..017d0e7ac 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign2.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -41,4 +40,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign3.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign3.pass.cpp
index 4b702fa8b..8838b81e1 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign3.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/assign3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char16_t s2[3] = {0};
@@ -26,4 +25,6 @@ int main()
     assert(s2[2] == char16_t(5));
     assert(std::char_traits<char16_t>::assign(NULL, 0, char16_t(5)) == NULL);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/compare.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/compare.pass.cpp
index b4be1402a..d0782c093 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/compare.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ constexpr bool test_constexpr()
 #endif
 
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -59,4 +58,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp
index 4f66d2c2c..102f15acd 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char16_t s1[] = {1, 2, 3};
@@ -28,4 +27,6 @@ int main()
     assert(std::char_traits<char16_t>::copy(NULL, s1, 0) == NULL);
     assert(std::char_traits<char16_t>::copy(s1, NULL, 0) == s1);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eof.pass.cpp
index 3b6e0d609..c80b0792a 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     std::char_traits<char16_t>::int_type i = std::char_traits<char16_t>::eof();
     ((void)i); // Prevent unused warning
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq.pass.cpp
index c58db4c14..1c705109f 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -26,4 +25,6 @@ int main()
     assert(!std::char_traits<char16_t>::eq(u'a', u'A'));
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq_int_type.pass.cpp
index 42546f450..bef97d612 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/eq_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -29,4 +28,6 @@ int main()
     assert( std::char_traits<char16_t>::eq_int_type(std::char_traits<char16_t>::eof(),
                                                     std::char_traits<char16_t>::eof()));
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/find.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/find.pass.cpp
index 852451cb8..2ca7e5343 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/find.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char16_t s1[] = {1, 2, 3};
@@ -45,4 +44,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/length.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/length.pass.cpp
index 5d882bde2..f487c410b 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/length.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -42,4 +41,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/lt.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/lt.pass.cpp
index 232767069..a43a9e45c 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/lt.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -26,4 +25,6 @@ int main()
     assert( std::char_traits<char16_t>::lt(u'A', u'a'));
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/move.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/move.pass.cpp
index b2ae8040e..aa55e0d11 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/move.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char16_t s1[] = {1, 2, 3};
@@ -32,4 +31,6 @@ int main()
     assert(std::char_traits<char16_t>::move(NULL, s1, 0) == NULL);
     assert(std::char_traits<char16_t>::move(s1, NULL, 0) == s1);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/not_eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/not_eof.pass.cpp
index af9378073..bf26b4cf3 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/not_eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/not_eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -29,4 +28,6 @@ int main()
     assert(std::char_traits<char16_t>::not_eof(std::char_traits<char16_t>::eof()) !=
            std::char_traits<char16_t>::eof());
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_char_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_char_type.pass.cpp
index 2a679d0cf..738754bf9 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_char_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_char_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -27,4 +26,6 @@ int main()
 #endif
     assert(std::char_traits<char16_t>::to_char_type(0) == 0);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_int_type.pass.cpp
index 93861461b..83fff60b8 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/to_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -27,4 +26,6 @@ int main()
 #endif
     assert(std::char_traits<char16_t>::to_int_type(0) == 0);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/types.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/types.pass.cpp
index a40296b25..41e3fd4d5 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/types.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char16_t/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <type_traits>
 #include <cstdint>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     static_assert((std::is_same<std::char_traits<char16_t>::char_type, char16_t>::value), "");
@@ -30,4 +29,6 @@ int main()
     static_assert((std::is_same<std::char_traits<char16_t>::pos_type, std::u16streampos>::value), "");
     static_assert((std::is_same<std::char_traits<char16_t>::state_type, std::mbstate_t>::value), "");
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign2.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign2.pass.cpp
index 373931169..f77d54f79 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign2.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -41,4 +40,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign3.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign3.pass.cpp
index 8e0ee2f6f..26985481c 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign3.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/assign3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char32_t s2[3] = {0};
@@ -26,4 +25,6 @@ int main()
     assert(s2[2] == char32_t(5));
     assert(std::char_traits<char32_t>::assign(NULL, 0, char32_t(5)) == NULL);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/compare.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/compare.pass.cpp
index 1730d06cc..f2dd01ac9 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/compare.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -58,4 +57,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/copy.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/copy.pass.cpp
index 89c22250b..8b2d6ce90 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/copy.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char32_t s1[] = {1, 2, 3};
@@ -28,4 +27,6 @@ int main()
     assert(std::char_traits<char32_t>::copy(NULL, s1, 0) == NULL);
     assert(std::char_traits<char32_t>::copy(s1, NULL, 0) == s1);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eof.pass.cpp
index 178486d70..5c28f47bb 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     std::char_traits<char32_t>::int_type i = std::char_traits<char32_t>::eof();
     ((void)i); // Prevent unused warning
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq.pass.cpp
index 92dd5b87b..516f38bd0 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -26,4 +25,6 @@ int main()
     assert(!std::char_traits<char32_t>::eq(U'a', U'A'));
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq_int_type.pass.cpp
index d39798c74..5d241159f 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/eq_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -29,4 +28,6 @@ int main()
     assert( std::char_traits<char32_t>::eq_int_type(std::char_traits<char32_t>::eof(),
                                                     std::char_traits<char32_t>::eof()));
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/find.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/find.pass.cpp
index 6d201db62..5a89596de 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/find.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char32_t s1[] = {1, 2, 3};
@@ -45,4 +44,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/length.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/length.pass.cpp
index 9d691aca4..ef2ea3419 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/length.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -42,4 +41,6 @@ int main()
     static_assert(test_constexpr(), "" );
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/lt.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/lt.pass.cpp
index f091bd980..51c1faf9e 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/lt.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -26,4 +25,6 @@ int main()
     assert( std::char_traits<char32_t>::lt(U'A', U'a'));
 #endif
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/move.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/move.pass.cpp
index 8641525d9..7cda99bd8 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/move.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     char32_t s1[] = {1, 2, 3};
@@ -32,4 +31,6 @@ int main()
     assert(std::char_traits<char32_t>::move(NULL, s1, 0) == NULL);
     assert(std::char_traits<char32_t>::move(s1, NULL, 0) == s1);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/not_eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/not_eof.pass.cpp
index b83fd0fe0..aeba1228e 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/not_eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/not_eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -29,4 +28,6 @@ int main()
     assert(std::char_traits<char32_t>::not_eof(std::char_traits<char32_t>::eof()) !=
            std::char_traits<char32_t>::eof());
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_char_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_char_type.pass.cpp
index c9820424f..75104e7bf 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_char_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_char_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -27,4 +26,6 @@ int main()
 #endif
     assert(std::char_traits<char32_t>::to_char_type(0) == 0);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_int_type.pass.cpp
index 801c4cf7c..8299e94da 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/to_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
 #if TEST_STD_VER >= 11
@@ -27,4 +26,6 @@ int main()
 #endif
     assert(std::char_traits<char32_t>::to_int_type(0) == 0);
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/types.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/types.pass.cpp
index 3b48af14f..5ec558f54 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/types.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char32_t/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <type_traits>
 #include <cstdint>
 
-int main()
+int main(int, char**)
 {
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
     static_assert((std::is_same<std::char_traits<char32_t>::char_type, char32_t>::value), "");
@@ -30,4 +29,6 @@ int main()
     static_assert((std::is_same<std::char_traits<char32_t>::pos_type, std::u32streampos>::value), "");
     static_assert((std::is_same<std::char_traits<char32_t>::state_type, std::mbstate_t>::value), "");
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign2.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign2.pass.cpp
index e293115fa..c669ab9c1 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign2.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@ constexpr bool test_constexpr()
     return c == u'a';
 }
 
-int main()
+int main(int, char**)
 {
     char8_t c = u8'\0';
     std::char_traits<char8_t>::assign(c, u8'a');
@@ -35,5 +34,7 @@ int main()
     static_assert(test_constexpr(), "");
 }
 #else
-int main () {}
+int main(int, char**) {
+  return 0;
+}
 #endif
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp
index d1fab485c..f9c176e9b 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/assign3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     char8_t s2[3] = {0};
@@ -27,4 +26,6 @@ int main()
     assert(s2[2] == char8_t(5));
     assert(std::char_traits<char8_t>::assign(NULL, 0, char8_t(5)) == NULL);
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/compare.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/compare.pass.cpp
index 5ab1c9f0b..063ab5dc5 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/compare.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char8_t>::compare(u8"", u8"", 0) == 0);
     assert(std::char_traits<char8_t>::compare(NULL, NULL, 0) == 0);
@@ -54,5 +53,7 @@ int main()
     static_assert(test_constexpr(), "" );
 }
 #else
-int main () {}
+int main(int, char**) {
+  return 0;
+}
 #endif
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp
index 74d51667d..7bf949197 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     char8_t s1[] = {1, 2, 3};
@@ -29,4 +28,6 @@ int main()
     assert(std::char_traits<char8_t>::copy(NULL, s1, 0) == NULL);
     assert(std::char_traits<char8_t>::copy(s1, NULL, 0) == s1);
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eof.pass.cpp
index c48e3aedd..e11255688 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     std::char_traits<char8_t>::int_type i = std::char_traits<char8_t>::eof();
     ((void)i); // Prevent unused warning
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq.pass.cpp
index 2b7d793c7..6e32c85bb 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -19,10 +18,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     assert( std::char_traits<char8_t>::eq(u8'a', u8'a'));
     assert(!std::char_traits<char8_t>::eq(u8'a', u8'A'));
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq_int_type.pass.cpp
index 15e645e3a..8c5e19717 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/eq_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     assert( std::char_traits<char8_t>::eq_int_type(u8'a', u8'a'));
@@ -28,4 +27,6 @@ int main()
     assert( std::char_traits<char8_t>::eq_int_type(std::char_traits<char8_t>::eof(),
                                                     std::char_traits<char8_t>::eof()));
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/find.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/find.pass.cpp
index f35816659..170539e06 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/find.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -29,7 +28,7 @@ constexpr bool test_constexpr()
         && std::char_traits<char8_t>::find(p, 3, u8'4') == nullptr;
 }
 
-int main()
+int main(int, char**)
 {
     char8_t s1[] = {1, 2, 3};
     assert(std::char_traits<char8_t>::find(s1, 3, char8_t(1)) == s1);
@@ -42,5 +41,7 @@ int main()
     static_assert(test_constexpr(), "" );
 }
 #else
-int main () {}
+int main(int, char**) {
+  return 0;
+}
 #endif
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/length.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/length.pass.cpp
index f200c2332..ce2c717cc 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/length.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@ constexpr bool test_constexpr()
         && std::char_traits<char8_t>::length(u8"abcd") == 4;
 }
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<char8_t>::length(u8"") == 0);
     assert(std::char_traits<char8_t>::length(u8"a") == 1);
@@ -37,5 +36,7 @@ int main()
     static_assert(test_constexpr(), "");
 }
 #else
-int main() { }
+int main(int, char**) { 
+  return 0;
+}
 #endif
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/lt.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/lt.pass.cpp
index 73c703f77..a4fb12512 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/lt.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -19,10 +18,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     assert(!std::char_traits<char8_t>::lt(u8'a', u8'a'));
     assert( std::char_traits<char8_t>::lt(u8'A', u8'a'));
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp
index 688e55932..a5e1359dd 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     char8_t s1[] = {1, 2, 3};
@@ -33,4 +32,6 @@ int main()
     assert(std::char_traits<char8_t>::move(NULL, s1, 0) == NULL);
     assert(std::char_traits<char8_t>::move(s1, NULL, 0) == s1);
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/not_eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/not_eof.pass.cpp
index 274d93f13..3d1141d72 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/not_eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/not_eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     assert(std::char_traits<char8_t>::not_eof(u8'a') == u8'a');
@@ -28,4 +27,6 @@ int main()
     assert(std::char_traits<char8_t>::not_eof(std::char_traits<char8_t>::eof()) !=
            std::char_traits<char8_t>::eof());
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_char_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_char_type.pass.cpp
index 96159209f..4edc49452 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_char_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_char_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -19,11 +18,13 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     assert(std::char_traits<char8_t>::to_char_type(u8'a') == u8'a');
     assert(std::char_traits<char8_t>::to_char_type(u8'A') == u8'A');
     assert(std::char_traits<char8_t>::to_char_type(0) == 0);
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_int_type.pass.cpp
index 659be36ad..ab3c9dc79 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/to_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -19,11 +18,13 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     assert(std::char_traits<char8_t>::to_int_type(u8'a') == u8'a');
     assert(std::char_traits<char8_t>::to_int_type(u8'A') == u8'A');
     assert(std::char_traits<char8_t>::to_int_type(0) == 0);
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/types.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/types.pass.cpp
index 64c27ffd7..245dcd87d 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/types.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char8_t/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -22,7 +21,7 @@
 #include <type_traits>
 #include <cstdint>
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     static_assert((std::is_same<std::char_traits<char8_t>::char_type,  char8_t>::value), "");
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<std::char_traits<char8_t>::pos_type,   std::u16streampos>::value), "");
     static_assert((std::is_same<std::char_traits<char8_t>::state_type, std::mbstate_t>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign2.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign2.pass.cpp
index 7a317f0d6..25e427014 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign2.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     wchar_t c = L'\0';
     std::char_traits<wchar_t>::assign(c, L'a');
@@ -37,4 +36,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
index acb505671..d4ed43409 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     wchar_t s2[3] = {0};
     assert(std::char_traits<wchar_t>::assign(s2, 3, wchar_t(5)) == s2);
@@ -24,4 +23,6 @@ int main()
     assert(s2[1] == wchar_t(5));
     assert(s2[2] == wchar_t(5));
     assert(std::char_traits<wchar_t>::assign(NULL, 0, wchar_t(5)) == NULL);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/compare.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/compare.pass.cpp
index 894560d69..1c2e11912 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/compare.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/compare.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<wchar_t>::compare(L"", L"", 0) == 0);
     assert(std::char_traits<wchar_t>::compare(NULL, NULL, 0) == 0);
@@ -54,4 +53,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
index f6d254f4c..309c21316 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     wchar_t s1[] = {1, 2, 3};
     wchar_t s2[3] = {0};
@@ -26,4 +25,6 @@ int main()
     assert(s2[2] == wchar_t(3));
     assert(std::char_traits<wchar_t>::copy(NULL, s1, 0) == NULL);
     assert(std::char_traits<wchar_t>::copy(s1, NULL, 0) == s1);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eof.pass.cpp
index 61499b580..6190220fe 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<wchar_t>::eof() == WEOF);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq.pass.cpp
index bd00b07ad..701a6502f 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<wchar_t>::eq(L'a', L'a'));
     assert(!std::char_traits<wchar_t>::eq(L'a', L'A'));
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq_int_type.pass.cpp
index 6b523dbdd..b218186b4 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/eq_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert( std::char_traits<wchar_t>::eq_int_type(L'a', L'a'));
     assert(!std::char_traits<wchar_t>::eq_int_type(L'a', L'A'));
     assert(!std::char_traits<wchar_t>::eq_int_type(std::char_traits<wchar_t>::eof(), L'A'));
     assert( std::char_traits<wchar_t>::eq_int_type(std::char_traits<wchar_t>::eof(),
                                                    std::char_traits<wchar_t>::eof()));
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp
index 80aca0ea7..78a9ad5c3 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     wchar_t s1[] = {1, 2, 3};
     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(1)) == s1);
@@ -43,4 +42,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/length.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/length.pass.cpp
index 35cbb2d5f..742189205 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/length.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/length.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<wchar_t>::length(L"") == 0);
     assert(std::char_traits<wchar_t>::length(L"a") == 1);
@@ -38,4 +37,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/lt.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/lt.pass.cpp
index 60cbc218b..9abd9cf59 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/lt.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(!std::char_traits<wchar_t>::lt(L'a', L'a'));
     assert( std::char_traits<wchar_t>::lt(L'A', L'a'));
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
index 0d80446e7..341a90233 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     wchar_t s1[] = {1, 2, 3};
     assert(std::char_traits<wchar_t>::move(s1, s1+1, 2) == s1);
@@ -30,4 +29,6 @@ int main()
     assert(s1[2] == wchar_t(3));
     assert(std::char_traits<wchar_t>::move(NULL, s1, 0) == NULL);
     assert(std::char_traits<wchar_t>::move(s1, NULL, 0) == s1);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/not_eof.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/not_eof.pass.cpp
index ee44f313b..92f08b1d5 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/not_eof.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/not_eof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<wchar_t>::not_eof(L'a') == L'a');
     assert(std::char_traits<wchar_t>::not_eof(L'A') == L'A');
     assert(std::char_traits<wchar_t>::not_eof(0) == 0);
     assert(std::char_traits<wchar_t>::not_eof(std::char_traits<wchar_t>::eof()) !=
            std::char_traits<wchar_t>::eof());
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_char_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_char_type.pass.cpp
index 9b4c04829..f479bec9d 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_char_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_char_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<wchar_t>::to_char_type(L'a') == L'a');
     assert(std::char_traits<wchar_t>::to_char_type(L'A') == L'A');
     assert(std::char_traits<wchar_t>::to_char_type(0) == 0);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_int_type.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_int_type.pass.cpp
index 488b03e0f..11fe2419b 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_int_type.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/to_int_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::char_traits<wchar_t>::to_int_type(L'a') == L'a');
     assert(std::char_traits<wchar_t>::to_int_type(L'A') == L'A');
     assert(std::char_traits<wchar_t>::to_int_type(0) == 0);
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/types.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/types.pass.cpp
index 12598975c..9781d55e3 100644
--- a/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/types.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,11 +19,13 @@
 #include <string>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::char_traits<wchar_t>::char_type, wchar_t>::value), "");
     static_assert((std::is_same<std::char_traits<wchar_t>::int_type, std::wint_t>::value), "");
     static_assert((std::is_same<std::char_traits<wchar_t>::off_type, std::streamoff>::value), "");
     static_assert((std::is_same<std::char_traits<wchar_t>::pos_type, std::wstreampos>::value), "");
     static_assert((std::is_same<std::char_traits<wchar_t>::state_type, std::mbstate_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.specializations/nothing_to_do.pass.cpp b/test/std/strings/char.traits/char.traits.specializations/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/strings/char.traits/char.traits.specializations/nothing_to_do.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.specializations/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/char.traits.typedefs/nothing_to_do.pass.cpp b/test/std/strings/char.traits/char.traits.typedefs/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/strings/char.traits/char.traits.typedefs/nothing_to_do.pass.cpp
+++ b/test/std/strings/char.traits/char.traits.typedefs/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/char.traits/nothing_to_do.pass.cpp b/test/std/strings/char.traits/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/strings/char.traits/nothing_to_do.pass.cpp
+++ b/test/std/strings/char.traits/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/strings/string.classes/typedefs.pass.cpp b/test/std/strings/string.classes/typedefs.pass.cpp
index 15d971235..cbc028391 100644
--- a/test/std/strings/string.classes/typedefs.pass.cpp
+++ b/test/std/strings/string.classes/typedefs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::string, std::basic_string<char> >::value), "");
     static_assert((std::is_same<std::wstring, std::basic_string<wchar_t> >::value), "");
@@ -34,4 +33,6 @@ int main()
     static_assert((std::is_same<std::u16string, std::basic_string<char16_t> >::value), "");
     static_assert((std::is_same<std::u32string, std::basic_string<char32_t> >::value), "");
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stod.pass.cpp b/test/std/strings/string.conversions/stod.pass.cpp
index 8773a6184..d13b695f2 100644
--- a/test/std/strings/string.conversions/stod.pass.cpp
+++ b/test/std/strings/string.conversions/stod.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stod("0") == 0);
     assert(std::stod(L"0") == 0);
@@ -186,4 +185,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stof.pass.cpp b/test/std/strings/string.conversions/stof.pass.cpp
index 7c1936487..2c8e4c9b9 100644
--- a/test/std/strings/string.conversions/stof.pass.cpp
+++ b/test/std/strings/string.conversions/stof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -23,7 +22,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stof("0") == 0);
     assert(std::stof(L"0") == 0);
@@ -187,4 +186,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stoi.pass.cpp b/test/std/strings/string.conversions/stoi.pass.cpp
index efc43b3aa..b3e416331 100644
--- a/test/std/strings/string.conversions/stoi.pass.cpp
+++ b/test/std/strings/string.conversions/stoi.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stoi("0") == 0);
     assert(std::stoi(L"0") == 0);
@@ -110,4 +109,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stol.pass.cpp b/test/std/strings/string.conversions/stol.pass.cpp
index 481543622..ef0cbb4ed 100644
--- a/test/std/strings/string.conversions/stol.pass.cpp
+++ b/test/std/strings/string.conversions/stol.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stol("0") == 0);
     assert(std::stol(L"0") == 0);
@@ -114,4 +113,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stold.pass.cpp b/test/std/strings/string.conversions/stold.pass.cpp
index 9d9dc3832..5b21fd0e3 100644
--- a/test/std/strings/string.conversions/stold.pass.cpp
+++ b/test/std/strings/string.conversions/stold.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stold("0") == 0);
     assert(std::stold(L"0") == 0);
@@ -189,4 +188,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stoll.pass.cpp b/test/std/strings/string.conversions/stoll.pass.cpp
index fe4c40b78..73d5e8201 100644
--- a/test/std/strings/string.conversions/stoll.pass.cpp
+++ b/test/std/strings/string.conversions/stoll.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stoll("0") == 0);
     assert(std::stoll(L"0") == 0);
@@ -113,4 +112,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stoul.pass.cpp b/test/std/strings/string.conversions/stoul.pass.cpp
index c79c94941..6ef861396 100644
--- a/test/std/strings/string.conversions/stoul.pass.cpp
+++ b/test/std/strings/string.conversions/stoul.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stoul("0") == 0);
     assert(std::stoul(L"0") == 0);
@@ -112,4 +111,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/stoull.pass.cpp b/test/std/strings/string.conversions/stoull.pass.cpp
index 2ac883ec0..3e21c683a 100644
--- a/test/std/strings/string.conversions/stoull.pass.cpp
+++ b/test/std/strings/string.conversions/stoull.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::stoull("0") == 0);
     assert(std::stoull(L"0") == 0);
@@ -113,4 +112,6 @@ int main()
         assert(idx == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/to_string.pass.cpp b/test/std/strings/string.conversions/to_string.pass.cpp
index fdc682ce1..23729cd4f 100644
--- a/test/std/strings/string.conversions/to_string.pass.cpp
+++ b/test/std/strings/string.conversions/to_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -113,7 +112,7 @@ test_float()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_signed<int>();
     test_signed<long>();
@@ -124,4 +123,6 @@ int main()
     test_float<float>();
     test_float<double>();
     test_float<long double>();
+
+  return 0;
 }
diff --git a/test/std/strings/string.conversions/to_wstring.pass.cpp b/test/std/strings/string.conversions/to_wstring.pass.cpp
index 2208ec5a3..02a262a0f 100644
--- a/test/std/strings/string.conversions/to_wstring.pass.cpp
+++ b/test/std/strings/string.conversions/to_wstring.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -113,7 +112,7 @@ test_float()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_signed<int>();
     test_signed<long>();
@@ -124,4 +123,6 @@ int main()
     test_float<float>();
     test_float<double>();
     test_float<long double>();
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/char.bad.fail.cpp b/test/std/strings/string.view/char.bad.fail.cpp
index cbd2b47b9..522466613 100644
--- a/test/std/strings/string.view/char.bad.fail.cpp
+++ b/test/std/strings/string.view/char.bad.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ private:
     int two;
 };
 
-int main()
+int main(int, char**)
 {
     {
 //  array
@@ -50,4 +49,6 @@ int main()
     std::basic_string_view<NotStandardLayout, test_traits<NotStandardLayout> > sv;
 //  expected-error-re@string_view:* {{static_assert failed{{.*}} "Character type of basic_string_view must be standard-layout"}}
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.access/at.pass.cpp b/test/std/strings/string.view/string.view.access/at.pass.cpp
index 7d5cf241e..3d741c33f 100644
--- a/test/std/strings/string.view/string.view.access/at.pass.cpp
+++ b/test/std/strings/string.view/string.view.access/at.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ void test ( const CharT *s, size_t len ) {
 #endif
 }
 
-int main () {
+int main(int, char**) {
     test ( "ABCDE", 5 );
     test ( "a", 1 );
 
@@ -60,4 +59,6 @@ int main () {
     static_assert ( sv.at(1) == 'B', "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.access/back.pass.cpp b/test/std/strings/string.view/string.view.access/back.pass.cpp
index 73f773726..4505f1cf9 100644
--- a/test/std/strings/string.view/string.view.access/back.pass.cpp
+++ b/test/std/strings/string.view/string.view.access/back.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ bool test ( const CharT *s, size_t len ) {
     return &sv.back() == s + len - 1;
     }
 
-int main () {
+int main(int, char**) {
     assert ( test ( "ABCDE", 5 ));
     assert ( test ( "a", 1 ));
 
@@ -47,4 +46,6 @@ int main () {
     static_assert ( sv.back()  == 'B', "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.access/data.pass.cpp b/test/std/strings/string.view/string.view.access/data.pass.cpp
index a179cfa1c..9ab83dfb2 100644
--- a/test/std/strings/string.view/string.view.access/data.pass.cpp
+++ b/test/std/strings/string.view/string.view.access/data.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ void test ( const CharT *s, size_t len ) {
 #endif
     }
 
-int main () {
+int main(int, char**) {
     test ( "ABCDE", 5 );
     test ( "a", 1 );
 
@@ -51,4 +50,6 @@ int main () {
     static_assert( sv.data() == s, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.access/front.pass.cpp b/test/std/strings/string.view/string.view.access/front.pass.cpp
index c627e02c4..554ed1bab 100644
--- a/test/std/strings/string.view/string.view.access/front.pass.cpp
+++ b/test/std/strings/string.view/string.view.access/front.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ bool test ( const CharT *s, size_t len ) {
     return &sv.front() == s;
     }
 
-int main () {
+int main(int, char**) {
     assert ( test ( "ABCDE", 5 ));
     assert ( test ( "a", 1 ));
 
@@ -47,4 +46,6 @@ int main () {
     static_assert ( sv.front()  == 'A', "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.access/index.pass.cpp b/test/std/strings/string.view/string.view.access/index.pass.cpp
index 65eb6b4f6..33992de7c 100644
--- a/test/std/strings/string.view/string.view.access/index.pass.cpp
+++ b/test/std/strings/string.view/string.view.access/index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ void test ( const CharT *s, size_t len ) {
         }
     }
 
-int main () {
+int main(int, char**) {
     test ( "ABCDE", 5 );
     test ( "a", 1 );
 
@@ -50,4 +49,6 @@ int main () {
     static_assert ( sv[1]  == 'B', "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp b/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp
index fda67c3bf..025d905a3 100644
--- a/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp
+++ b/test/std/strings/string.view/string.view.capacity/capacity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ void test2 ( const CharT *s, size_t len ) {
     }
 }
 
-int main () {
+int main(int, char**) {
     test1<std::string_view> ();
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
     test1<std::u8string_view> ();
@@ -100,4 +99,6 @@ int main () {
     test2 ( U"a", 1 );
     test2 ( U"", 0 );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.capacity/empty.fail.cpp b/test/std/strings/string.view/string.view.capacity/empty.fail.cpp
index da1a67b08..1dd1dcf7c 100644
--- a/test/std/strings/string.view/string.view.capacity/empty.fail.cpp
+++ b/test/std/strings/string.view/string.view.capacity/empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main ()
+int main(int, char**)
 {
     std::string_view c;
     c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opeq.string_view.pointer.pass.cpp b/test/std/strings/string.view/string.view.comparison/opeq.string_view.pointer.pass.cpp
index 079c89191..e771bd328 100644
--- a/test/std/strings/string.view/string.view.comparison/opeq.string_view.pointer.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opeq.string_view.pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(S lhs, const typename S::value_type* rhs, bool x)
     assert((rhs == lhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -66,4 +65,6 @@ int main()
     static_assert (!("abcde0" == sv2), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opeq.string_view.string.pass.cpp b/test/std/strings/string.view/string.view.comparison/opeq.string_view.string.pass.cpp
index 4b107b01e..d27d4c445 100644
--- a/test/std/strings/string.view/string.view.comparison/opeq.string_view.string.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opeq.string_view.string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const std::string &lhs, S rhs, bool x)
     assert((rhs == lhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -47,5 +46,7 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghij"), false);
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true);
     }
+
+  return 0;
 }
 
diff --git a/test/std/strings/string.view/string.view.comparison/opeq.string_view.string_view.pass.cpp b/test/std/strings/string.view/string.view.comparison/opeq.string_view.string_view.pass.cpp
index 59cd7215b..259711e3c 100644
--- a/test/std/strings/string.view/string.view.comparison/opeq.string_view.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opeq.string_view.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S lhs, S rhs, bool x)
     assert((rhs == lhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -59,4 +58,6 @@ int main()
     static_assert (!(sv1 == sv3), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opge.string_view.pointer.pass.cpp b/test/std/strings/string.view/string.view.comparison/opge.string_view.pointer.pass.cpp
index a75cb3185..5fa57eb39 100644
--- a/test/std/strings/string.view/string.view.comparison/opge.string_view.pointer.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opge.string_view.pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
     assert((rhs >= lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -69,4 +68,6 @@ int main()
     static_assert (  "abcde0" >= sv2, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opge.string_view.string.pass.cpp b/test/std/strings/string.view/string.view.comparison/opge.string_view.string.pass.cpp
index 3881372ff..dddaa390e 100644
--- a/test/std/strings/string.view/string.view.comparison/opge.string_view.string.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opge.string_view.string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
     assert((rhs >= lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -47,4 +46,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghij", true, false);
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true, true);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opge.string_view.string_view.pass.cpp b/test/std/strings/string.view/string.view.comparison/opge.string_view.string_view.pass.cpp
index 85455e18d..d35bea575 100644
--- a/test/std/strings/string.view/string.view.comparison/opge.string_view.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opge.string_view.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const S& lhs, const S& rhs, bool x, bool y)
     assert((rhs >= lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -62,4 +61,6 @@ int main()
     static_assert (  sv2 >= sv1,  "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp b/test/std/strings/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp
index d4dc39e89..80dcc7b49 100644
--- a/test/std/strings/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
     assert((rhs > lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -69,4 +68,6 @@ int main()
     static_assert (  "abcde0" > sv2, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opgt.string_view.string.pass.cpp b/test/std/strings/string.view/string.view.comparison/opgt.string_view.string.pass.cpp
index f0058c809..84c9478bf 100644
--- a/test/std/strings/string.view/string.view.comparison/opgt.string_view.string.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opgt.string_view.string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
     assert((rhs > lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -47,4 +46,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghij", true, false);
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false, false);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opgt.string_view.string_view.pass.cpp b/test/std/strings/string.view/string.view.comparison/opgt.string_view.string_view.pass.cpp
index 09f5360cd..ec31d5c2c 100644
--- a/test/std/strings/string.view/string.view.comparison/opgt.string_view.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opgt.string_view.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const S& lhs, const S& rhs, bool x, bool y)
     assert((rhs > lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -62,4 +61,6 @@ int main()
     static_assert (  sv2 > sv1, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/ople.string_view.pointer.pass.cpp b/test/std/strings/string.view/string.view.comparison/ople.string_view.pointer.pass.cpp
index da6e2d90a..4f582239a 100644
--- a/test/std/strings/string.view/string.view.comparison/ople.string_view.pointer.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/ople.string_view.pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
     assert((rhs <= lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -69,4 +68,6 @@ int main()
     static_assert (!("abcde0" <= sv2), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/ople.string_view.string.pass.cpp b/test/std/strings/string.view/string.view.comparison/ople.string_view.string.pass.cpp
index 092bc23b1..80e80757b 100644
--- a/test/std/strings/string.view/string.view.comparison/ople.string_view.string.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/ople.string_view.string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
     assert((rhs <= lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -47,4 +46,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghij", false, true);
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true, true);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp b/test/std/strings/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp
index 17c0b6bfd..b1c186124 100644
--- a/test/std/strings/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const S& lhs, const S& rhs, bool x, bool y)
     assert((rhs <= lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -62,4 +61,6 @@ int main()
     static_assert (!(sv2 <= sv1), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/oplt.string_view.pointer.pass.cpp b/test/std/strings/string.view/string.view.comparison/oplt.string_view.pointer.pass.cpp
index 554663f1b..14bba2abf 100644
--- a/test/std/strings/string.view/string.view.comparison/oplt.string_view.pointer.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/oplt.string_view.pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
     assert((rhs < lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -69,4 +68,6 @@ int main()
     static_assert (!("abcde0" < sv2), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/oplt.string_view.string.pass.cpp b/test/std/strings/string.view/string.view.comparison/oplt.string_view.string.pass.cpp
index 609edd764..f611bac7a 100644
--- a/test/std/strings/string.view/string.view.comparison/oplt.string_view.string.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/oplt.string_view.string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
     assert((rhs < lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -47,4 +46,6 @@ int main()
     test(S("abcdefghijklmnopqrst"), "abcdefghij", false, true);
     test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false, false);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/oplt.string_view.string_view.pass.cpp b/test/std/strings/string.view/string.view.comparison/oplt.string_view.string_view.pass.cpp
index 9ae1927b4..f44e37361 100644
--- a/test/std/strings/string.view/string.view.comparison/oplt.string_view.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/oplt.string_view.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(const S& lhs, const S& rhs, bool x, bool y)
     assert((rhs < lhs) == y);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -62,4 +61,6 @@ int main()
     static_assert (!(sv2 < sv1), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opne.string_view.pointer.pass.cpp b/test/std/strings/string.view/string.view.comparison/opne.string_view.pointer.pass.cpp
index 8a9c4dbfe..6b8add831 100644
--- a/test/std/strings/string.view/string.view.comparison/opne.string_view.pointer.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opne.string_view.pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ test(S lhs, const typename S::value_type* rhs, bool x)
     assert((rhs != lhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -67,4 +66,6 @@ int main()
     static_assert (  "abcde0" != sv2, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opne.string_view.string.pass.cpp b/test/std/strings/string.view/string.view.comparison/opne.string_view.string.pass.cpp
index 0c981e21d..613eaf7b3 100644
--- a/test/std/strings/string.view/string.view.comparison/opne.string_view.string.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opne.string_view.string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const std::string &lhs, S rhs, bool x)
     assert((rhs != lhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -47,4 +46,6 @@ int main()
     test("abcdefghijklmnopqrst", S("abcdefghij"), true);
     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false);
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.comparison/opne.string_view.string_view.pass.cpp b/test/std/strings/string.view/string.view.comparison/opne.string_view.string_view.pass.cpp
index 63a3000f9..90d153335 100644
--- a/test/std/strings/string.view/string.view.comparison/opne.string_view.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.comparison/opne.string_view.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ test(S lhs, S rhs, bool x)
     assert((rhs != lhs) == x);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -59,4 +58,6 @@ int main()
     static_assert (   sv1 != sv3,  "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/assign.pass.cpp b/test/std/strings/string.view/string.view.cons/assign.pass.cpp
index bab788921..b2bf8ed71 100644
--- a/test/std/strings/string.view/string.view.cons/assign.pass.cpp
+++ b/test/std/strings/string.view/string.view.cons/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ bool test (T sv0)
     return sv0.size() == sv1.size() && sv0.data() == sv1.data();
     }
 
-int main () {
+int main(int, char**) {
 
     assert( test<std::string_view>    (  "1234"));
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -55,4 +54,6 @@ int main () {
 #endif
     static_assert( test<std::wstring_view>   ({ L"abc", 3}), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/default.pass.cpp b/test/std/strings/string.view/string.view.cons/default.pass.cpp
index 0c94918b5..07a453b23 100644
--- a/test/std/strings/string.view/string.view.cons/default.pass.cpp
+++ b/test/std/strings/string.view/string.view.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test () {
     }
 }
 
-int main () {
+int main(int, char**) {
     test<std::string_view> ();
     test<std::u16string_view> ();
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -45,4 +44,6 @@ int main () {
     test<std::u32string_view> ();
     test<std::wstring_view> ();
 
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp b/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp
index c98a8bd67..bcd83da74 100644
--- a/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp
+++ b/test/std/strings/string.view/string.view.cons/from_literal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test ( const CharT *s ) {
     }
 
 
-int main () {
+int main(int, char**) {
 
     test ( "QBCDE" );
     test ( "A" );
@@ -66,4 +65,6 @@ int main () {
     static_assert ( sv1.size() == 5, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp b/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp
index 2e4faab95..92ae675a3 100644
--- a/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp
+++ b/test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test ( const CharT *s, size_t sz ) {
     }
 }
 
-int main () {
+int main(int, char**) {
 
     test ( "QBCDE", 5 );
     test ( "QBCDE", 2 );
@@ -83,4 +82,6 @@ int main () {
     }
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/from_string.pass.cpp b/test/std/strings/string.view/string.view.cons/from_string.pass.cpp
index 237d1221d..2043d662a 100644
--- a/test/std/strings/string.view/string.view.cons/from_string.pass.cpp
+++ b/test/std/strings/string.view/string.view.cons/from_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test ( const std::basic_string<CharT, Traits> &str ) {
     assert ( sv1.data() == str.data());
 }
 
-int main () {
+int main(int, char**) {
 
     test ( std::string("QBCDE") );
     test ( std::string("") );
@@ -62,4 +61,6 @@ int main () {
     test ( std::basic_string<char, dummy_char_traits>("") );
     test ( std::basic_string<char, dummy_char_traits>() );
 
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/from_string1.fail.cpp b/test/std/strings/string.view/string.view.cons/from_string1.fail.cpp
index 006bea749..3c464d7fe 100644
--- a/test/std/strings/string.view/string.view.cons/from_string1.fail.cpp
+++ b/test/std/strings/string.view/string.view.cons/from_string1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct dummy_char_traits : public std::char_traits<char> {};
 
-int main () {
+int main(int, char**) {
     using string_view = std::basic_string_view<char>;
     using string      = std::              basic_string     <char, dummy_char_traits>;
 
@@ -29,4 +28,6 @@ int main () {
     assert ( sv1.size() == s.size());
     assert ( sv1.data() == s.data());
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/from_string2.fail.cpp b/test/std/strings/string.view/string.view.cons/from_string2.fail.cpp
index 6c9ac6436..482d22001 100644
--- a/test/std/strings/string.view/string.view.cons/from_string2.fail.cpp
+++ b/test/std/strings/string.view/string.view.cons/from_string2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 struct dummy_char_traits : public std::char_traits<char> {};
 
-int main () {
+int main(int, char**) {
     using string_view = std::basic_string_view<char, dummy_char_traits>;
     using string      = std::              basic_string     <char>;
 
@@ -29,4 +28,6 @@ int main () {
     assert ( sv1.size() == s.size());
     assert ( sv1.data() == s.data());
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.cons/implicit_deduction_guides.pass.cpp b/test/std/strings/string.view/string.view.cons/implicit_deduction_guides.pass.cpp
index 7dd99d9c4..b95dca63d 100644
--- a/test/std/strings/string.view/string.view.cons/implicit_deduction_guides.pass.cpp
+++ b/test/std/strings/string.view/string.view.cons/implicit_deduction_guides.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@
 // (2)  basic_string_view(const basic_string_view&)
 // (3)  basic_string_view(const CharT*, size_type)
 // (4)  basic_string_view(const CharT*)
-int main()
+int main(int, char**)
 {
   { // Testing (1)
     // Nothing TODO. Cannot deduce without any arguments.
@@ -62,4 +61,6 @@ int main()
     ASSERT_SAME_TYPE(decltype(w), std::wstring_view);
     assert(w == L"abcdef");
   }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_char_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_char_size.pass.cpp
index 67a913308..82173a93a 100644
--- a/test/std/strings/string.view/string.view.find/find_char_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(0 <= x && x + 1 <= s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -82,4 +81,6 @@ int main()
     static_assert (sv2.find( 'c', 4 ) == SV::npos, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_not_of_char_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_not_of_char_size.pass.cpp
index 77e1343cb..4566adabf 100644
--- a/test/std/strings/string.view/string.view.find/find_first_not_of_char_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_not_of_char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -82,4 +81,6 @@ int main()
     static_assert (sv2.find_first_not_of( 'q', 5 ) == SV::npos, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size.pass.cpp
index a15ac1ef2..17c3c5293 100644
--- a/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -142,7 +141,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -163,4 +162,6 @@ int main()
     static_assert (sv2.find_first_not_of( "lecar", 0) == 1, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size_size.pass.cpp
index 5587a0334..707a7a964 100644
--- a/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -367,7 +366,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -390,4 +389,6 @@ int main()
     static_assert (sv2.find_first_not_of( "lecar", 0, 5) == 1, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_not_of_string_view_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_not_of_string_view_size.pass.cpp
index a52c57766..37445b578 100644
--- a/test/std/strings/string.view/string.view.find/find_first_not_of_string_view_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_not_of_string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -138,11 +137,13 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
     test0<S>();
     test1<S>();
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_of_char_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_of_char_size.pass.cpp
index 21722ecc7..d4916bec3 100644
--- a/test/std/strings/string.view/string.view.find/find_first_of_char_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_of_char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -80,4 +79,6 @@ int main()
     static_assert (sv2.find_first_of( 'e', 5 ) == SV::npos, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_of_pointer_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_of_pointer_size.pass.cpp
index 55e71c4f5..7e43109af 100644
--- a/test/std/strings/string.view/string.view.find/find_first_of_pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_of_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -142,7 +141,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -163,4 +162,6 @@ int main()
     static_assert (sv2.find_first_of( "lecar", 0) == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_of_pointer_size_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_of_pointer_size_size.pass.cpp
index fa9917c6e..165fb2362 100644
--- a/test/std/strings/string.view/string.view.find/find_first_of_pointer_size_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_of_pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -367,7 +366,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -390,4 +389,6 @@ int main()
     static_assert (sv2.find_first_of( "lecar", 0, 5) == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_first_of_string_view_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_first_of_string_view_size.pass.cpp
index b8bbd86a4..c705f0266 100644
--- a/test/std/strings/string.view/string.view.find/find_first_of_string_view_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_first_of_string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -138,11 +137,13 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
     test0<S>();
     test1<S>();
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_not_of_char_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_not_of_char_size.pass.cpp
index 5a792974f..0b6e6cfb0 100644
--- a/test/std/strings/string.view/string.view.find/find_last_not_of_char_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_not_of_char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -80,4 +79,6 @@ int main()
     static_assert (sv2.find_last_not_of( 'e', 5 ) == 3, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size.pass.cpp
index 81881dead..fe17b779d 100644
--- a/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -142,7 +141,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -163,4 +162,6 @@ int main()
     static_assert (sv2.find_last_not_of( "lecar", 5) == 3, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size_size.pass.cpp
index 314f338e7..11a5c27e8 100644
--- a/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -367,7 +366,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -390,4 +389,6 @@ int main()
     static_assert (sv2.find_last_not_of( "lecar", 5, 0) == 4, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_not_of_string_view_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_not_of_string_view_size.pass.cpp
index 89a8f9f38..e90e38c0d 100644
--- a/test/std/strings/string.view/string.view.find/find_last_not_of_string_view_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_not_of_string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -138,11 +137,13 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
     test0<S>();
     test1<S>();
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_of_char_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_of_char_size.pass.cpp
index b4e0196a5..fdcf31736 100644
--- a/test/std/strings/string.view/string.view.find/find_last_of_char_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_of_char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x < s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -80,4 +79,6 @@ int main()
     static_assert (sv2.find_last_of( 'e', 5 ) == 4, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_of_pointer_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_of_pointer_size.pass.cpp
index d19010e07..640f48375 100644
--- a/test/std/strings/string.view/string.view.find/find_last_of_pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_of_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -142,7 +141,7 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 19);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -163,4 +162,6 @@ int main()
     static_assert (sv2.find_last_of( "lecar", 5) == 4, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_of_pointer_size_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_of_pointer_size_size.pass.cpp
index 7d2804bf6..e82c935b5 100644
--- a/test/std/strings/string.view/string.view.find/find_last_of_pointer_size_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_of_pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -367,7 +366,7 @@ void test3()
     test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, 19);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -390,4 +389,6 @@ int main()
     static_assert (sv2.find_last_of( "lecar", 5, 5) == 4, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_last_of_string_view_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_last_of_string_view_size.pass.cpp
index ed530870e..02c1184ee 100644
--- a/test/std/strings/string.view/string.view.find/find_last_of_string_view_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_last_of_string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -138,11 +137,13 @@ void test1()
     test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 19);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
     test0<S>();
     test1<S>();
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_pointer_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_pointer_size.pass.cpp
index 9380f6cd8..3f4fee54e 100644
--- a/test/std/strings/string.view/string.view.find/find_pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -148,7 +147,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -169,4 +168,6 @@ int main()
     static_assert (sv2.find( "abcde", 1) == SV::npos, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_pointer_size_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_pointer_size_size.pass.cpp
index da01b75e7..74caa6fea 100644
--- a/test/std/strings/string.view/string.view.find/find_pointer_size_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -367,7 +366,7 @@ void test3()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, S::npos);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -391,4 +390,6 @@ int main()
     static_assert (sv2.find( "abcde", 0, 1 ) == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/find_string_view_size.pass.cpp b/test/std/strings/string.view/string.view.find/find_string_view_size.pass.cpp
index 387e834f4..ed3b7c11c 100644
--- a/test/std/strings/string.view/string.view.find/find_string_view_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/find_string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -162,4 +161,6 @@ int main()
     static_assert (sv2.find(sv2, 1 ) == SV::npos, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/rfind_char_size.pass.cpp b/test/std/strings/string.view/string.view.find/rfind_char_size.pass.cpp
index 6fc87b8e9..959bb05f8 100644
--- a/test/std/strings/string.view/string.view.find/rfind_char_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/rfind_char_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ test(const S& s, typename S::value_type c, typename S::size_type x)
         assert(x + 1 <= s.size());
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -81,4 +80,6 @@ int main()
     static_assert (sv2.rfind( 'b', 4 ) == 1, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/rfind_pointer_size.pass.cpp b/test/std/strings/string.view/string.view.find/rfind_pointer_size.pass.cpp
index 4d7688206..6010083ab 100644
--- a/test/std/strings/string.view/string.view.find/rfind_pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/rfind_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -148,7 +147,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -169,4 +168,6 @@ int main()
     static_assert (sv2.rfind( "abcde", 1) == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/rfind_pointer_size_size.pass.cpp b/test/std/strings/string.view/string.view.find/rfind_pointer_size_size.pass.cpp
index ce16d418e..c3ca97e7f 100644
--- a/test/std/strings/string.view/string.view.find/rfind_pointer_size_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/rfind_pointer_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -366,7 +365,7 @@ void test3()
     test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -390,4 +389,6 @@ int main()
     static_assert (sv2.rfind( "abcde", 0, 1 ) == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.find/rfind_string_view_size.pass.cpp b/test/std/strings/string.view/string.view.find/rfind_string_view_size.pass.cpp
index eded51af2..c4ceef331 100644
--- a/test/std/strings/string.view/string.view.find/rfind_string_view_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.find/rfind_string_view_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -141,7 +140,7 @@ void test1()
     test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view S;
@@ -162,4 +161,6 @@ int main()
     static_assert (sv2.rfind(sv2, 1) == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp b/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp
index 70515bf48..d52f16303 100644
--- a/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp
+++ b/test/std/strings/string.view/string.view.hash/enabled_hashes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
   {
     test_hash_enabled_for_type<std::string_view>();
@@ -31,4 +30,6 @@ int main() {
     test_hash_enabled_for_type<std::u32string_view>();
 #endif
   }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.hash/string_view.pass.cpp b/test/std/strings/string.view/string.view.hash/string_view.pass.cpp
index 042e1dfab..0e296f209 100644
--- a/test/std/strings/string.view/string.view.hash/string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.hash/string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ test()
     assert(sh(ss2) == h(s2));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::string_view>();
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -67,4 +66,6 @@ int main()
     test<std::u32string_view>();
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
     test<std::wstring_view>();
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.io/stream_insert.pass.cpp b/test/std/strings/string.view/string.view.io/stream_insert.pass.cpp
index 343c297d2..d4dcbdc6b 100644
--- a/test/std/strings/string.view/string.view.io/stream_insert.pass.cpp
+++ b/test/std/strings/string.view/string.view.io/stream_insert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 using std::string_view;
 using std::wstring_view;
 
-int main()
+int main(int, char**)
 {
     {
         std::ostringstream out;
@@ -55,4 +54,6 @@ int main()
         assert(out.good());
         assert(L"   " + s == out.str());
     }
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.iterators/begin.pass.cpp b/test/std/strings/string.view/string.view.iterators/begin.pass.cpp
index 339f1f8fd..ba700c8ab 100644
--- a/test/std/strings/string.view/string.view.iterators/begin.pass.cpp
+++ b/test/std/strings/string.view/string.view.iterators/begin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ test(S s)
 }
 
 
-int main()
+int main(int, char**)
 {
     typedef std::string_view    string_view;
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -91,4 +90,6 @@ int main()
     static_assert (   *wsv.cbegin() ==   wsv[0], "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.iterators/end.pass.cpp b/test/std/strings/string.view/string.view.iterators/end.pass.cpp
index 1533b49ba..59c29e2db 100644
--- a/test/std/strings/string.view/string.view.iterators/end.pass.cpp
+++ b/test/std/strings/string.view/string.view.iterators/end.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ test(S s)
 }
 
 
-int main()
+int main(int, char**)
 {
     typedef std::string_view    string_view;
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -100,4 +99,6 @@ int main()
     static_assert (   wsv.begin() !=   wsv.cend(), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp b/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp
index 0ec838718..a57d7b454 100644
--- a/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp
+++ b/test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ test(S s)
 }
 
 
-int main()
+int main(int, char**)
 {
     typedef std::string_view    string_view;
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -92,4 +91,6 @@ int main()
     static_assert (   *wsv.crbegin() ==   wsv[2], "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.iterators/rend.pass.cpp b/test/std/strings/string.view/string.view.iterators/rend.pass.cpp
index dfcb836f1..e0db02c22 100644
--- a/test/std/strings/string.view/string.view.iterators/rend.pass.cpp
+++ b/test/std/strings/string.view/string.view.iterators/rend.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ test(S s)
 }
 
 
-int main()
+int main(int, char**)
 {
     typedef std::string_view    string_view;
 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
@@ -100,4 +99,6 @@ int main()
     static_assert (   *--wsv.crend() ==   wsv[0], "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp b/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp
index f2f6313ae..2287ba6c8 100644
--- a/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp
+++ b/test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ constexpr size_t test_ce ( size_t n, size_t k ) {
 }
 #endif
 
-int main () {
+int main(int, char**) {
     test ( "ABCDE", 5 );
     test ( "a", 1 );
     test ( "", 0 );
@@ -75,4 +74,6 @@ int main () {
     static_assert ( test_ce ( 9, 3 ) == 6, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp b/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp
index 41f8362d3..0636bcea9 100644
--- a/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp
+++ b/test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ constexpr size_t test_ce ( size_t n, size_t k ) {
 }
 #endif
 
-int main () {
+int main(int, char**) {
     test ( "ABCDE", 5 );
     test ( "a", 1 );
     test ( "", 0 );
@@ -75,4 +74,6 @@ int main () {
     static_assert ( test_ce ( 9, 3 ) == 6, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp b/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp
index 780fbad5f..2fc286e96 100644
--- a/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp
+++ b/test/std/strings/string.view/string.view.modifiers/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ constexpr size_t test_ce ( size_t n, size_t k ) {
 #endif
 
 
-int main () {
+int main(int, char**) {
     test ( "ABCDE", 5 );
     test ( "a", 1 );
     test ( "", 0 );
@@ -73,4 +72,6 @@ int main () {
     static_assert ( test_ce (0, 1) == 1, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.nonmem/quoted.pass.cpp b/test/std/strings/string.view/string.view.nonmem/quoted.pass.cpp
index c11e144a0..ecc24abf4 100644
--- a/test/std/strings/string.view/string.view.nonmem/quoted.pass.cpp
+++ b/test/std/strings/string.view/string.view.nonmem/quoted.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -161,7 +160,7 @@ std::wstring unquote ( const wchar_t *p, wchar_t delim='"', wchar_t escape='\\'
     return s;
 }
 
-int main()
+int main(int, char**)
 {
     round_trip    (  "" );
     round_trip_ws (  "" );
@@ -208,7 +207,11 @@ int main()
 
     assert ( unquote (  "" ) ==  "" ); // nothing there
     assert ( unquote ( L"" ) == L"" ); // nothing there
-    }
+
+    return 0;
+}
 #else
-int main() {}
+int main(int, char**) {
+  return 0;
+}
 #endif
diff --git a/test/std/strings/string.view/string.view.ops/compare.pointer.pass.cpp b/test/std/strings/string.view/string.view.ops/compare.pointer.pass.cpp
index eb6eb1e97..0c04ce5e4 100644
--- a/test/std/strings/string.view/string.view.ops/compare.pointer.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/compare.pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test( const CharT *s1, const CharT *s2, int expected)
     test1 ( sv1, s2, expected );
 }
 
-int main()
+int main(int, char**)
 {
     {
     test("", "", 0);
@@ -124,4 +123,6 @@ int main()
     static_assert ( sv2.compare("abcde") == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp b/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp
index 546590326..974e68710 100644
--- a/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -355,7 +354,7 @@ void test2()
 }
 
 
-int main()
+int main(int, char**)
 {
     test0();
     test1();
@@ -450,4 +449,6 @@ int main()
     static_assert ( sv2.compare(0, 6, "abcde") == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp b/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp
index d170949c7..73773fb26 100644
--- a/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -355,7 +354,7 @@ void test2()
 }
 
 
-int main () {
+int main(int, char**) {
     test0();
     test1();
     test2();
@@ -399,4 +398,6 @@ int main () {
     static_assert ( sv1.compare(2, 4, sv2) == 1, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp b/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp
index f1489e7df..df4e7394d 100644
--- a/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -1292,7 +1291,7 @@ void test11()
     }
 
 
-int main () {
+int main(int, char**) {
     test0();
     test1();
     test2();
@@ -1350,4 +1349,6 @@ int main () {
     static_assert ( sv2.compare(0, 0, "abcde", 1, 0) == 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp b/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp
index e93d6ddfe..56b6ec1f4 100644
--- a/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -5748,7 +5747,7 @@ void test54()
 }
 
 
-int main () {
+int main(int, char**) {
     test0();
     test1();
     test2();
@@ -5845,4 +5844,6 @@ int main () {
     static_assert ( sv1.compare(2, 4, "abcde", 3, 4) == -1, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp b/test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp
index ddff1dd0a..9c27f2674 100644
--- a/test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ void test ( const CharT *s1, const CharT  *s2, int expected ) {
     test1(sv1, sv2, expected);
 }
 
-int main () {
+int main(int, char**) {
 
     test("",                     "", 0);
     test("",                     "abcde", -5);
@@ -119,4 +118,6 @@ int main () {
     static_assert ( sv2.compare(sv3)  < 0, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.ops/copy.pass.cpp b/test/std/strings/string.view/string.view.ops/copy.pass.cpp
index 98e83ef50..e96650992 100644
--- a/test/std/strings/string.view/string.view.ops/copy.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -78,7 +77,7 @@ void test ( const CharT *s ) {
 
 }
 
-int main () {
+int main(int, char**) {
     test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
     test ( "ABCDE");
     test ( "a" );
@@ -100,4 +99,6 @@ int main () {
     test ( U"a" );
     test ( U"" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.ops/substr.pass.cpp b/test/std/strings/string.view/string.view.ops/substr.pass.cpp
index 5f9a60067..c2fd01f57 100644
--- a/test/std/strings/string.view/string.view.ops/substr.pass.cpp
+++ b/test/std/strings/string.view/string.view.ops/substr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,7 @@ void test ( const CharT *s ) {
     test1(sv1, sv1.size() + 1, string_view_t::npos);
 }
 
-int main () {
+int main(int, char**) {
     test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
     test ( "ABCDE");
     test ( "a" );
@@ -118,4 +117,6 @@ int main () {
     }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.synop/nothing_to_do.pass.cpp b/test/std/strings/string.view/string.view.synop/nothing_to_do.pass.cpp
index 353dd98f4..45edec7f4 100644
--- a/test/std/strings/string.view/string.view.synop/nothing_to_do.pass.cpp
+++ b/test/std/strings/string.view/string.view.synop/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include <string_view>
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/strings/string.view/string.view.template/ends_with.char.pass.cpp b/test/std/strings/string.view/string.view.template/ends_with.char.pass.cpp
index 1511f014b..c03733074 100644
--- a/test/std/strings/string.view/string.view.template/ends_with.char.pass.cpp
+++ b/test/std/strings/string.view/string.view.template/ends_with.char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "constexpr_char_traits.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view SV;
@@ -44,4 +43,6 @@ int main()
     static_assert (!sv2.ends_with('x'), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.template/ends_with.ptr.pass.cpp b/test/std/strings/string.view/string.view.template/ends_with.ptr.pass.cpp
index 544cddd84..64caf5cc0 100644
--- a/test/std/strings/string.view/string.view.template/ends_with.ptr.pass.cpp
+++ b/test/std/strings/string.view/string.view.template/ends_with.ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "constexpr_char_traits.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view SV;
@@ -101,4 +100,6 @@ int main()
     static_assert ( svNot.ends_with("def"), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.template/ends_with.string_view.pass.cpp b/test/std/strings/string.view/string.view.template/ends_with.string_view.pass.cpp
index 61ea807ba..b5f67f8dd 100644
--- a/test/std/strings/string.view/string.view.template/ends_with.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.template/ends_with.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "constexpr_char_traits.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view SV;
@@ -101,4 +100,6 @@ int main()
     static_assert ( svNot.ends_with(svNot), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.template/nothing_to_do.pass.cpp b/test/std/strings/string.view/string.view.template/nothing_to_do.pass.cpp
index 353dd98f4..45edec7f4 100644
--- a/test/std/strings/string.view/string.view.template/nothing_to_do.pass.cpp
+++ b/test/std/strings/string.view/string.view.template/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include <string_view>
 
-int main () {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/strings/string.view/string.view.template/starts_with.char.pass.cpp b/test/std/strings/string.view/string.view.template/starts_with.char.pass.cpp
index 042aea601..d43944fde 100644
--- a/test/std/strings/string.view/string.view.template/starts_with.char.pass.cpp
+++ b/test/std/strings/string.view/string.view.template/starts_with.char.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "constexpr_char_traits.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view SV;
@@ -44,4 +43,6 @@ int main()
     static_assert (!sv2.starts_with('x'), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.template/starts_with.ptr.pass.cpp b/test/std/strings/string.view/string.view.template/starts_with.ptr.pass.cpp
index baaa4c973..ce651ec57 100644
--- a/test/std/strings/string.view/string.view.template/starts_with.ptr.pass.cpp
+++ b/test/std/strings/string.view/string.view.template/starts_with.ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "constexpr_char_traits.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view SV;
@@ -101,4 +100,6 @@ int main()
     static_assert ( svNot.starts_with("def"), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string.view.template/starts_with.string_view.pass.cpp b/test/std/strings/string.view/string.view.template/starts_with.string_view.pass.cpp
index 7501926af..3d184bae0 100644
--- a/test/std/strings/string.view/string.view.template/starts_with.string_view.pass.cpp
+++ b/test/std/strings/string.view/string.view.template/starts_with.string_view.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "constexpr_char_traits.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::string_view SV;
@@ -101,4 +100,6 @@ int main()
     static_assert ( svNot.starts_with(svNot), "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string_view.literals/literal.pass.cpp b/test/std/strings/string.view/string_view.literals/literal.pass.cpp
index cc2202e83..a8a1dff64 100644
--- a/test/std/strings/string.view/string_view.literals/literal.pass.cpp
+++ b/test/std/strings/string.view/string_view.literals/literal.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
     typedef std::string_view   u8string_view;
 #endif
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals::string_view_literals;
 
@@ -70,4 +69,6 @@ int main()
     static_assert(noexcept( L"ABC"sv), "");
     static_assert(noexcept( u"ABC"sv), "");
     static_assert(noexcept( U"ABC"sv), "");
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string_view.literals/literal1.fail.cpp b/test/std/strings/string.view/string_view.literals/literal1.fail.cpp
index 6e6854f55..5bf108bbe 100644
--- a/test/std/strings/string.view/string_view.literals/literal1.fail.cpp
+++ b/test/std/strings/string.view/string_view.literals/literal1.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 #include <string_view>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using std::string_view;
 
     string_view foo  =   ""sv;  // should fail w/conversion operator not found
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string_view.literals/literal1.pass.cpp b/test/std/strings/string.view/string_view.literals/literal1.pass.cpp
index f663d022b..ba667e09c 100644
--- a/test/std/strings/string.view/string_view.literals/literal1.pass.cpp
+++ b/test/std/strings/string.view/string_view.literals/literal1.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <string_view>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals;
 
     std::string_view foo  =   ""sv;
     assert(foo.length() == 0);
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string_view.literals/literal2.fail.cpp b/test/std/strings/string.view/string_view.literals/literal2.fail.cpp
index 4907a5510..2287e1ce9 100644
--- a/test/std/strings/string.view/string_view.literals/literal2.fail.cpp
+++ b/test/std/strings/string.view/string_view.literals/literal2.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,9 @@
 #include <string_view>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::string_view foo  =   ""sv;  // should fail w/conversion operator not found
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string_view.literals/literal2.pass.cpp b/test/std/strings/string.view/string_view.literals/literal2.pass.cpp
index 3bb6f6c0a..cb49280bf 100644
--- a/test/std/strings/string.view/string_view.literals/literal2.pass.cpp
+++ b/test/std/strings/string.view/string_view.literals/literal2.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <string_view>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals::string_view_literals;
 
     std::string_view foo  =   ""sv;
     assert(foo.length() == 0);
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/string_view.literals/literal3.pass.cpp b/test/std/strings/string.view/string_view.literals/literal3.pass.cpp
index 144a1cdd1..710933dd9 100644
--- a/test/std/strings/string.view/string_view.literals/literal3.pass.cpp
+++ b/test/std/strings/string.view/string_view.literals/literal3.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <string_view>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std;
 
     string_view foo  =   ""sv;
     assert(foo.length() == 0);
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/traits_mismatch.fail.cpp b/test/std/strings/string.view/traits_mismatch.fail.cpp
index 6cd15e6a6..5cf3fa947 100644
--- a/test/std/strings/string.view/traits_mismatch.fail.cpp
+++ b/test/std/strings/string.view/traits_mismatch.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 
 #include <string_view>
 
-int main()
+int main(int, char**)
 {
     std::basic_string_view<char, std::char_traits<wchar_t>> s;
+
+  return 0;
 }
diff --git a/test/std/strings/string.view/types.pass.cpp b/test/std/strings/string.view/types.pass.cpp
index 2763f7fb4..d90f777ba 100644
--- a/test/std/strings/string.view/types.pass.cpp
+++ b/test/std/strings/string.view/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,7 +67,7 @@ test()
     static_assert((std::is_same<typename S::reverse_iterator, typename S::const_reverse_iterator>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::char_traits<char> >();
     test<std::char_traits<wchar_t> >();
@@ -77,4 +76,6 @@ int main()
 #endif
     static_assert((std::is_same<std::basic_string_view<char>::traits_type,
                                 std::char_traits<char> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/strings/strings.erasure/erase.pass.cpp b/test/std/strings/strings.erasure/erase.pass.cpp
index 657a56c73..5013300d2 100644
--- a/test/std/strings/strings.erasure/erase.pass.cpp
+++ b/test/std/strings/strings.erasure/erase.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -68,9 +67,11 @@ void test()
     test0(S("aba"), opt('c'), S("aba"));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::string>();
     test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>> ();
     test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>> ();
+
+  return 0;
 }
diff --git a/test/std/strings/strings.erasure/erase_if.pass.cpp b/test/std/strings/strings.erasure/erase_if.pass.cpp
index d7014868f..5f2fb0117 100644
--- a/test/std/strings/strings.erasure/erase_if.pass.cpp
+++ b/test/std/strings/strings.erasure/erase_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -68,9 +67,11 @@ void test()
     test0(S("aba"), True,   S(""));
 }
 
-int main()
+int main(int, char**)
 {
     test<std::string>();
     test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>> ();
     test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>> ();
+
+  return 0;
 }
diff --git a/test/std/strings/strings.general/nothing_to_do.pass.cpp b/test/std/strings/strings.general/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/strings/strings.general/nothing_to_do.pass.cpp
+++ b/test/std/strings/strings.general/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.async/async.fail.cpp b/test/std/thread/futures/futures.async/async.fail.cpp
index e20f1a0a5..3e7fb80e0 100644
--- a/test/std/thread/futures/futures.async/async.fail.cpp
+++ b/test/std/thread/futures/futures.async/async.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,8 +30,10 @@
 
 int foo (int x) { return x; }
 
-int main ()
+int main(int, char**)
 {
     std::async(                    foo, 3); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
     std::async(std::launch::async, foo, 3); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.async/async.pass.cpp b/test/std/thread/futures/futures.async/async.pass.cpp
index 9adebb285..225b63ec8 100644
--- a/test/std/thread/futures/futures.async/async.pass.cpp
+++ b/test/std/thread/futures/futures.async/async.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -103,7 +102,7 @@ void test(CheckLamdba&& getAndCheckFn, bool IsDeferred, Args&&... args) {
     }
 }
 
-int main()
+int main(int, char**)
 {
     // The default launch policy is implementation defined. libc++ defines
     // it to be std::launch::async.
@@ -152,4 +151,5 @@ int main()
         try { f.get(); assert (false); } catch ( int ) {}
     }
 #endif
+    return 0;
 }
diff --git a/test/std/thread/futures/futures.async/async_race.38682.pass.cpp b/test/std/thread/futures/futures.async/async_race.38682.pass.cpp
index bc82ba849..826704a75 100644
--- a/test/std/thread/futures/futures.async/async_race.38682.pass.cpp
+++ b/test/std/thread/futures/futures.async/async_race.38682.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,7 @@ static int& worker_ref(int& i) { return i; }
 
 static void worker_void() { }
 
-int main() {
+int main(int, char**) {
   // future<T>
   {
     std::vector<int> const v{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
@@ -66,4 +65,6 @@ int main() {
       fut.get();
     }
   }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.async/async_race.pass.cpp b/test/std/thread/futures/futures.async/async_race.pass.cpp
index 1189f3550..9da57e38a 100644
--- a/test/std/thread/futures/futures.async/async_race.pass.cpp
+++ b/test/std/thread/futures/futures.async/async_race.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -63,6 +62,8 @@ void test_each() {
     }
 }
 
-int main() {
+int main(int, char**) {
     for (int i=0; i < 25; ++i) test_each();
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp b/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp
index 7f28b8a23..fbb7eb13d 100644
--- a/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp
+++ b/test/std/thread/futures/futures.errors/default_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,10 +17,12 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat = std::future_category();
     std::error_condition e_cond = e_cat.default_error_condition(static_cast<int>(std::errc::not_a_directory));
     assert(e_cond.category() == e_cat);
     assert(e_cond.value() == static_cast<int>(std::errc::not_a_directory));
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.errors/equivalent_error_code_int.pass.cpp b/test/std/thread/futures/futures.errors/equivalent_error_code_int.pass.cpp
index cd0017657..3ba341094 100644
--- a/test/std/thread/futures/futures.errors/equivalent_error_code_int.pass.cpp
+++ b/test/std/thread/futures/futures.errors/equivalent_error_code_int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,9 +17,11 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat = std::future_category();
     assert(e_cat.equivalent(std::error_code(5, e_cat), 5));
     assert(!e_cat.equivalent(std::error_code(5, e_cat), 6));
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.errors/equivalent_int_error_condition.pass.cpp b/test/std/thread/futures/futures.errors/equivalent_int_error_condition.pass.cpp
index 05ad1ec9c..9d0e1cf31 100644
--- a/test/std/thread/futures/futures.errors/equivalent_int_error_condition.pass.cpp
+++ b/test/std/thread/futures/futures.errors/equivalent_int_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,10 +17,12 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& e_cat = std::future_category();
     std::error_condition e_cond = e_cat.default_error_condition(5);
     assert(e_cat.equivalent(5, e_cond));
     assert(!e_cat.equivalent(6, e_cond));
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.errors/future_category.pass.cpp b/test/std/thread/futures/futures.errors/future_category.pass.cpp
index 7f407a061..7b9d72344 100644
--- a/test/std/thread/futures/futures.errors/future_category.pass.cpp
+++ b/test/std/thread/futures/futures.errors/future_category.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,8 +16,10 @@
 #include <cstring>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::error_category& ec = std::future_category();
     assert(std::strcmp(ec.name(), "future") == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.errors/make_error_code.pass.cpp b/test/std/thread/futures/futures.errors/make_error_code.pass.cpp
index 3c14addf3..d9e50bf42 100644
--- a/test/std/thread/futures/futures.errors/make_error_code.pass.cpp
+++ b/test/std/thread/futures/futures.errors/make_error_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,11 +17,13 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec = make_error_code(std::future_errc::broken_promise);
         assert(ec.value() == static_cast<int>(std::future_errc::broken_promise));
         assert(ec.category() == std::future_category());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.errors/make_error_condition.pass.cpp b/test/std/thread/futures/futures.errors/make_error_condition.pass.cpp
index 52972aa37..d05559102 100644
--- a/test/std/thread/futures/futures.errors/make_error_condition.pass.cpp
+++ b/test/std/thread/futures/futures.errors/make_error_condition.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         const std::error_condition ec1 =
@@ -27,4 +26,6 @@ int main()
                   static_cast<int>(std::future_errc::future_already_retrieved));
         assert(ec1.category() == std::future_category());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.future_error/code.pass.cpp b/test/std/thread/futures/futures.future_error/code.pass.cpp
index 35d44df5b..53acba393 100644
--- a/test/std/thread/futures/futures.future_error/code.pass.cpp
+++ b/test/std/thread/futures/futures.future_error/code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::error_code ec = std::make_error_code(std::future_errc::broken_promise);
@@ -54,4 +53,6 @@ int main()
         assert(f.code() == std::make_error_code(std::future_errc::no_state));
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.future_error/types.pass.cpp b/test/std/thread/futures/futures.future_error/types.pass.cpp
index e741dd06e..edf18ba5a 100644
--- a/test/std/thread/futures/futures.future_error/types.pass.cpp
+++ b/test/std/thread/futures/futures.future_error/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,8 +15,10 @@
 #include <future>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_convertible<std::future_error*,
                                        std::logic_error*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.future_error/what.pass.cpp b/test/std/thread/futures/futures.future_error/what.pass.cpp
index 957d530ab..468aeb85b 100644
--- a/test/std/thread/futures/futures.future_error/what.pass.cpp
+++ b/test/std/thread/futures/futures.future_error/what.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::future_error f(std::make_error_code(std::future_errc::broken_promise));
@@ -51,4 +50,6 @@ int main()
         LIBCPP_ASSERT(std::strcmp(f.what(), "Operation not permitted on an object without "
                       "an associated state.") == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.overview/future_errc.pass.cpp b/test/std/thread/futures/futures.overview/future_errc.pass.cpp
index 06397487a..d7840f45c 100644
--- a/test/std/thread/futures/futures.overview/future_errc.pass.cpp
+++ b/test/std/thread/futures/futures.overview/future_errc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -24,7 +23,7 @@
 
 #include <future>
 
-int main()
+int main(int, char**)
 {
     static_assert(std::future_errc::broken_promise != std::future_errc::future_already_retrieved, "");
     static_assert(std::future_errc::broken_promise != std::future_errc::promise_already_satisfied, "");
@@ -37,4 +36,6 @@ int main()
     static_assert(std::future_errc::future_already_retrieved != static_cast<std::future_errc>(0), "");
     static_assert(std::future_errc::promise_already_satisfied != static_cast<std::future_errc>(0), "");
     static_assert(std::future_errc::no_state != static_cast<std::future_errc>(0), "");
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.overview/future_status.pass.cpp b/test/std/thread/futures/futures.overview/future_status.pass.cpp
index 2c196aaac..ceff64f7e 100644
--- a/test/std/thread/futures/futures.overview/future_status.pass.cpp
+++ b/test/std/thread/futures/futures.overview/future_status.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,9 +19,11 @@
 
 #include <future>
 
-int main()
+int main(int, char**)
 {
     static_assert(static_cast<int>(std::future_status::ready) == 0, "");
     static_assert(static_cast<int>(std::future_status::timeout) == 1, "");
     static_assert(static_cast<int>(std::future_status::deferred) == 2, "");
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.overview/is_error_code_enum_future_errc.pass.cpp b/test/std/thread/futures/futures.overview/is_error_code_enum_future_errc.pass.cpp
index 8a3987cb5..c7e2c2aeb 100644
--- a/test/std/thread/futures/futures.overview/is_error_code_enum_future_errc.pass.cpp
+++ b/test/std/thread/futures/futures.overview/is_error_code_enum_future_errc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,10 +15,12 @@
 #include <future>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_error_code_enum  <std::future_errc>::value, "");
 #if TEST_STD_VER > 14
     static_assert(std::is_error_code_enum_v<std::future_errc>, "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.overview/launch.pass.cpp b/test/std/thread/futures/futures.overview/launch.pass.cpp
index a26b01f67..6d405b508 100644
--- a/test/std/thread/futures/futures.overview/launch.pass.cpp
+++ b/test/std/thread/futures/futures.overview/launch.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -23,7 +22,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
    LIBCPP_STATIC_ASSERT(static_cast<int>(std::launch::any) ==
@@ -44,4 +43,6 @@ int main()
 #endif
     static_assert(static_cast<int>(std::launch::async) == 1, "");
     static_assert(static_cast<int>(std::launch::deferred) == 2, "");
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/alloc_ctor.pass.cpp b/test/std/thread/futures/futures.promise/alloc_ctor.pass.cpp
index c0fe2ef88..ece8b94a5 100644
--- a/test/std/thread/futures/futures.promise/alloc_ctor.pass.cpp
+++ b/test/std/thread/futures/futures.promise/alloc_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -23,7 +22,7 @@
 #include "test_allocator.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     assert(test_alloc_base::alloc_count == 0);
     {
@@ -82,4 +81,6 @@ int main()
         std::future<void> f = p.get_future();
         assert(f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/copy_assign.fail.cpp b/test/std/thread/futures/futures.promise/copy_assign.fail.cpp
index 0311cf9b6..bf46a6847 100644
--- a/test/std/thread/futures/futures.promise/copy_assign.fail.cpp
+++ b/test/std/thread/futures/futures.promise/copy_assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     {
@@ -48,4 +47,6 @@ int main()
         p = p0; // expected-error {{'operator=' is a private member of 'std::__1::promise<void>'}}
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/copy_ctor.fail.cpp b/test/std/thread/futures/futures.promise/copy_ctor.fail.cpp
index 779fc5bfc..8f90f3da7 100644
--- a/test/std/thread/futures/futures.promise/copy_ctor.fail.cpp
+++ b/test/std/thread/futures/futures.promise/copy_ctor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     {
@@ -48,4 +47,6 @@ int main()
         std::promise<void> p(p0); // expected-error {{calling a private constructor of class 'std::__1::promise<void>'}}
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/default.pass.cpp b/test/std/thread/futures/futures.promise/default.pass.cpp
index d108b4275..600f99dd9 100644
--- a/test/std/thread/futures/futures.promise/default.pass.cpp
+++ b/test/std/thread/futures/futures.promise/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::promise<int> p;
@@ -36,4 +35,6 @@ int main()
         std::future<void> f = p.get_future();
         assert(f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/dtor.pass.cpp b/test/std/thread/futures/futures.promise/dtor.pass.cpp
index 49010a67b..49c4b4685 100644
--- a/test/std/thread/futures/futures.promise/dtor.pass.cpp
+++ b/test/std/thread/futures/futures.promise/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -124,4 +123,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/get_future.pass.cpp b/test/std/thread/futures/futures.promise/get_future.pass.cpp
index fc606c6c8..6385f6345 100644
--- a/test/std/thread/futures/futures.promise/get_future.pass.cpp
+++ b/test/std/thread/futures/futures.promise/get_future.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::promise<double> p;
@@ -57,4 +56,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/move_assign.pass.cpp b/test/std/thread/futures/futures.promise/move_assign.pass.cpp
index ad72bf78e..6592e0bb8 100644
--- a/test/std/thread/futures/futures.promise/move_assign.pass.cpp
+++ b/test/std/thread/futures/futures.promise/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     assert(test_alloc_base::alloc_count == 0);
     {
@@ -94,4 +93,6 @@ int main()
         assert(test_alloc_base::alloc_count == 1);
     }
     assert(test_alloc_base::alloc_count == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/move_ctor.pass.cpp b/test/std/thread/futures/futures.promise/move_ctor.pass.cpp
index c9971b0a3..1551420e9 100644
--- a/test/std/thread/futures/futures.promise/move_ctor.pass.cpp
+++ b/test/std/thread/futures/futures.promise/move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     assert(test_alloc_base::alloc_count == 0);
     {
@@ -88,4 +87,6 @@ int main()
 #endif
     }
     assert(test_alloc_base::alloc_count == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_exception.pass.cpp b/test/std/thread/futures/futures.promise/set_exception.pass.cpp
index 8788c6314..030620ad4 100644
--- a/test/std/thread/futures/futures.promise/set_exception.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_exception.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -46,4 +45,6 @@ int main()
             assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp b/test/std/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp
index 1cdeadf84..a1a32882b 100644
--- a/test/std/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_exception_at_thread_exit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -25,7 +24,7 @@ void func(std::promise<int> p)
     p.set_exception_at_thread_exit(std::make_exception_ptr(3));
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -42,4 +41,6 @@ int main()
             assert(i == 3);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_lvalue.pass.cpp b/test/std/thread/futures/futures.promise/set_lvalue.pass.cpp
index 6e2a4a5d9..db8bb5704 100644
--- a/test/std/thread/futures/futures.promise/set_lvalue.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int& T;
@@ -45,4 +44,6 @@ int main()
         }
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_lvalue_at_thread_exit.pass.cpp b/test/std/thread/futures/futures.promise/set_lvalue_at_thread_exit.pass.cpp
index e127d2c37..9c3b09086 100644
--- a/test/std/thread/futures/futures.promise/set_lvalue_at_thread_exit.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_lvalue_at_thread_exit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,7 @@ void func(std::promise<int&> p)
     i = 4;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::promise<int&> p;
@@ -36,4 +35,6 @@ int main()
         std::thread(func, std::move(p)).detach();
         assert(f.get() == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_rvalue.pass.cpp b/test/std/thread/futures/futures.promise/set_rvalue.pass.cpp
index e986885c0..7f54baa8c 100644
--- a/test/std/thread/futures/futures.promise/set_rvalue.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
     A(A&&) {throw 9;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::unique_ptr<int> T;
@@ -61,4 +60,6 @@ int main()
             assert(j == 9);
         }
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_rvalue_at_thread_exit.pass.cpp b/test/std/thread/futures/futures.promise/set_rvalue_at_thread_exit.pass.cpp
index 05675725b..bddd66135 100644
--- a/test/std/thread/futures/futures.promise/set_rvalue_at_thread_exit.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_rvalue_at_thread_exit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -24,7 +23,7 @@ void func(std::promise<std::unique_ptr<int>> p)
     p.set_value_at_thread_exit(std::unique_ptr<int>(new int(5)));
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::promise<std::unique_ptr<int>> p;
@@ -32,4 +31,6 @@ int main()
         std::thread(func, std::move(p)).detach();
         assert(*f.get() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_value_at_thread_exit_const.pass.cpp b/test/std/thread/futures/futures.promise/set_value_at_thread_exit_const.pass.cpp
index 79137488e..9258a0011 100644
--- a/test/std/thread/futures/futures.promise/set_value_at_thread_exit_const.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_value_at_thread_exit_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -25,7 +24,7 @@ void func(std::promise<int> p)
     p.set_value_at_thread_exit(i);
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::promise<int> p;
@@ -33,4 +32,6 @@ int main()
         std::thread(func, std::move(p)).detach();
         assert(f.get() == 5);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_value_at_thread_exit_void.pass.cpp b/test/std/thread/futures/futures.promise/set_value_at_thread_exit_void.pass.cpp
index 6a0ce3632..1a204421e 100644
--- a/test/std/thread/futures/futures.promise/set_value_at_thread_exit_void.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_value_at_thread_exit_void.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,7 @@ void func(std::promise<void> p)
     i = 1;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::promise<void> p;
@@ -37,4 +36,6 @@ int main()
         f.get();
         assert(i == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_value_const.pass.cpp b/test/std/thread/futures/futures.promise/set_value_const.pass.cpp
index 9c670c1e3..e58d2d245 100644
--- a/test/std/thread/futures/futures.promise/set_value_const.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_value_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ struct A
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -69,4 +68,6 @@ int main()
         }
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/set_value_void.pass.cpp b/test/std/thread/futures/futures.promise/set_value_void.pass.cpp
index 30c6853c9..d505b3aab 100644
--- a/test/std/thread/futures/futures.promise/set_value_void.pass.cpp
+++ b/test/std/thread/futures/futures.promise/set_value_void.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef void T;
@@ -38,4 +37,6 @@ int main()
             assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied));
         }
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/swap.pass.cpp b/test/std/thread/futures/futures.promise/swap.pass.cpp
index 21c946981..2b78b1d38 100644
--- a/test/std/thread/futures/futures.promise/swap.pass.cpp
+++ b/test/std/thread/futures/futures.promise/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -23,7 +22,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     assert(test_alloc_base::alloc_count == 0);
     {
@@ -82,4 +81,6 @@ int main()
         assert(test_alloc_base::alloc_count == 1);
     }
     assert(test_alloc_base::alloc_count == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.promise/uses_allocator.pass.cpp b/test/std/thread/futures/futures.promise/uses_allocator.pass.cpp
index 9a1d41cc0..1a5028bce 100644
--- a/test/std/thread/futures/futures.promise/uses_allocator.pass.cpp
+++ b/test/std/thread/futures/futures.promise/uses_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,9 +19,11 @@
 #include <future>
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::uses_allocator<std::promise<int>, test_allocator<int> >::value), "");
     static_assert((std::uses_allocator<std::promise<int&>, test_allocator<int> >::value), "");
     static_assert((std::uses_allocator<std::promise<void>, test_allocator<void> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/copy_assign.pass.cpp b/test/std/thread/futures/futures.shared_future/copy_assign.pass.cpp
index abb9928e8..e5cc33a0c 100644
--- a/test/std/thread/futures/futures.shared_future/copy_assign.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -78,4 +77,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/copy_ctor.pass.cpp b/test/std/thread/futures/futures.shared_future/copy_ctor.pass.cpp
index 2b6633138..01b5572e3 100644
--- a/test/std/thread/futures/futures.shared_future/copy_ctor.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/copy_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -72,4 +71,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/ctor_future.pass.cpp b/test/std/thread/futures/futures.shared_future/ctor_future.pass.cpp
index 1590efd7b..b75450cb9 100644
--- a/test/std/thread/futures/futures.shared_future/ctor_future.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/ctor_future.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -66,4 +65,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/default.pass.cpp b/test/std/thread/futures/futures.shared_future/default.pass.cpp
index 92927f5f6..0387b97a7 100644
--- a/test/std/thread/futures/futures.shared_future/default.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_future<int> f;
@@ -32,4 +31,6 @@ int main()
         std::shared_future<void> f;
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/dtor.pass.cpp b/test/std/thread/futures/futures.shared_future/dtor.pass.cpp
index 39a8e517d..fe49c2208 100644
--- a/test/std/thread/futures/futures.shared_future/dtor.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     assert(test_alloc_base::alloc_count == 0);
     {
@@ -67,4 +66,6 @@ int main()
         assert(f.valid());
     }
     assert(test_alloc_base::alloc_count == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/get.pass.cpp b/test/std/thread/futures/futures.shared_future/get.pass.cpp
index 23d33138e..038ca7151 100644
--- a/test/std/thread/futures/futures.shared_future/get.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/get.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -62,7 +61,7 @@ void func6(std::promise<void> p)
     p.set_exception(std::make_exception_ptr('c'));
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -151,4 +150,6 @@ int main()
         }
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/move_assign.pass.cpp b/test/std/thread/futures/futures.shared_future/move_assign.pass.cpp
index 3a1ef7a68..394053052 100644
--- a/test/std/thread/futures/futures.shared_future/move_assign.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -72,4 +71,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/move_ctor.pass.cpp b/test/std/thread/futures/futures.shared_future/move_ctor.pass.cpp
index 15323d678..e1d982d0e 100644
--- a/test/std/thread/futures/futures.shared_future/move_ctor.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -66,4 +65,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/wait.pass.cpp b/test/std/thread/futures/futures.shared_future/wait.pass.cpp
index 6ff74f6c6..f78ca6bfc 100644
--- a/test/std/thread/futures/futures.shared_future/wait.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/wait.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@ void func5(std::promise<void> p)
     p.set_value();
 }
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock Clock;
     typedef std::chrono::duration<double, std::milli> ms;
@@ -86,4 +85,6 @@ int main()
         assert(f.valid());
         assert(t1-t0 < ms(5));
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/wait_for.pass.cpp b/test/std/thread/futures/futures.shared_future/wait_for.pass.cpp
index 1ec086266..913127af3 100644
--- a/test/std/thread/futures/futures.shared_future/wait_for.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/wait_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -44,7 +43,7 @@ void func5(std::promise<void> p)
     p.set_value();
 }
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock Clock;
     {
@@ -95,4 +94,6 @@ int main()
         assert(f.valid());
         assert(t1-t0 < ms(5));
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp b/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp
index 4e107ca9a..09787fedc 100644
--- a/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp
+++ b/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -63,7 +62,7 @@ void func5(std::promise<void> p)
     set_worker_thread_state(WorkerThreadState::Exiting);
 }
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock Clock;
     {
@@ -129,4 +128,6 @@ int main()
         assert(f.valid());
         assert(t1-t0 < ms(5));
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.state/nothing_to_do.pass.cpp b/test/std/thread/futures/futures.state/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/thread/futures/futures.state/nothing_to_do.pass.cpp
+++ b/test/std/thread/futures/futures.state/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/assign_copy.fail.cpp b/test/std/thread/futures/futures.task/futures.task.members/assign_copy.fail.cpp
index 9449e1490..a8b858189 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/assign_copy.fail.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/assign_copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,10 +17,12 @@
 
 #include <future>
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p0, p;
         p = p0; // expected-error {{overload resolution selected deleted operator '='}}
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/assign_move.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/assign_move.pass.cpp
index 3f11d670b..9da7a96e2 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/assign_move.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/assign_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ public:
     long operator()(long i, long j) const {return data_ + i + j;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p0(A(5));
@@ -48,4 +47,6 @@ int main()
         assert(!p0.valid());
         assert(!p.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/ctor1.fail.cpp b/test/std/thread/futures/futures.task/futures.task.members/ctor1.fail.cpp
index 9d1ad61ce..ec081dc32 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/ctor1.fail.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/ctor1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,11 +25,13 @@ typedef std::packaged_task<A(int, char)> PT;
 typedef volatile std::packaged_task<A(int, char)> VPT;
 
 
-int main()
+int main(int, char**)
 {
     VPT init{};
     auto const& c_init = init;
     PT p1{init}; // expected-error {{no matching constructor}}
     PT p2{c_init}; // expected-error {{no matching constructor}}
     PT p3{std::move(init)}; // expected-error {{no matching constructor for initialization of 'PT' (aka 'packaged_task<A (int, char)>')}}
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/ctor2.fail.cpp b/test/std/thread/futures/futures.task/futures.task.members/ctor2.fail.cpp
index 212a12084..76273a3ea 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/ctor2.fail.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/ctor2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -27,8 +26,10 @@ struct A {};
 typedef std::packaged_task<A(int, char)> PT;
 typedef volatile std::packaged_task<A(int, char)> VPT;
 
-int main()
+int main(int, char**)
 {
     PT p { std::allocator_arg_t{}, test_allocator<A>{}, VPT {}}; // expected-error {{no matching constructor for initialization of 'PT' (aka 'packaged_task<A (int, char)>')}}
     // expected-note-re@future:* 1 {{candidate template ignored: {{(disabled by 'enable_if')|(requirement '.*' was not satisfied)}}}}
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/ctor_copy.fail.cpp b/test/std/thread/futures/futures.task/futures.task.members/ctor_copy.fail.cpp
index ff07db9a2..0816a1cc5 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/ctor_copy.fail.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/ctor_copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,10 +18,12 @@
 #include <future>
 
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p0;
         std::packaged_task<double(int, char)> p(p0); // expected-error {{call to deleted constructor of 'std::packaged_task<double (int, char)>'}}
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/ctor_default.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/ctor_default.pass.cpp
index ed147d748..5472c717a 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/ctor_default.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/ctor_default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,8 +20,10 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     std::packaged_task<A(int, char)> p;
     assert(!p.valid());
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/ctor_func.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/ctor_func.pass.cpp
index 14ac7614b..20ee8b4b4 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/ctor_func.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/ctor_func.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@ int A::n_copies = 0;
 
 int func(int i) { return i; }
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p(A(5));
@@ -77,4 +76,6 @@ int main()
         p(4);
         assert(f.get() == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/ctor_func_alloc.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/ctor_func_alloc.pass.cpp
index 14b29715e..766987ce0 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/ctor_func_alloc.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/ctor_func_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -45,7 +44,7 @@ int A::n_copies = 0;
 
 int func(int i) { return i; }
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p(std::allocator_arg,
@@ -124,4 +123,6 @@ int main()
     }
     A::n_copies = 0;
     A::n_moves  = 0;
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/ctor_move.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/ctor_move.pass.cpp
index d9951dca5..c517182d3 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/ctor_move.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/ctor_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ public:
     long operator()(long i, long j) const {return data_ + i + j;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p0(A(5));
@@ -46,4 +45,6 @@ int main()
         assert(!p0.valid());
         assert(!p.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/dtor.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/dtor.pass.cpp
index 07eeaaa46..3b794b7f6 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/dtor.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@ void func2(std::packaged_task<double(int, char)> p)
     p(3, 'a');
 }
 
-int main()
+int main(int, char**)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
@@ -65,4 +64,6 @@ int main()
         std::thread(func2, std::move(p)).detach();
         assert(f.get() == 105.0);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/get_future.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/get_future.pass.cpp
index 8f51dccd8..8713db0a7 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/get_future.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/get_future.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@ public:
     long operator()(long i, long j) const {return data_ + i + j;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p(A(5));
@@ -66,4 +65,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/make_ready_at_thread_exit.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/make_ready_at_thread_exit.pass.cpp
index a597c9d83..470099522 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/make_ready_at_thread_exit.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/make_ready_at_thread_exit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -81,7 +80,7 @@ void func3(std::packaged_task<double(int, char)> p)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p(A(5));
@@ -116,4 +115,6 @@ int main()
         t.join();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/operator.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/operator.pass.cpp
index 6acf8c5a6..536888057 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/operator.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/operator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -81,7 +80,7 @@ void func3(std::packaged_task<double(int, char)> p)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p(A(5));
@@ -117,4 +116,6 @@ int main()
         t.join();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/reset.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/reset.pass.cpp
index 190afdc6a..e9f59cdfe 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/reset.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/reset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -34,7 +33,7 @@ public:
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p(A(5));
@@ -60,4 +59,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.members/swap.pass.cpp b/test/std/thread/futures/futures.task/futures.task.members/swap.pass.cpp
index eb0091c8e..2cd97900d 100644
--- a/test/std/thread/futures/futures.task/futures.task.members/swap.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.members/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@ public:
     long operator()(long i, long j) const {return data_ + i + j;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p0(A(5));
@@ -48,4 +47,6 @@ int main()
         assert(!p0.valid());
         assert(!p.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.nonmembers/swap.pass.cpp b/test/std/thread/futures/futures.task/futures.task.nonmembers/swap.pass.cpp
index d90d593a7..8c1c19eca 100644
--- a/test/std/thread/futures/futures.task/futures.task.nonmembers/swap.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.nonmembers/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@ public:
     long operator()(long i, long j) const {return data_ + i + j;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::packaged_task<double(int, char)> p0(A(5));
@@ -50,4 +49,6 @@ int main()
         assert(!p0.valid());
         assert(!p.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.task/futures.task.nonmembers/uses_allocator.pass.cpp b/test/std/thread/futures/futures.task/futures.task.nonmembers/uses_allocator.pass.cpp
index 31ed57e22..5257a7008 100644
--- a/test/std/thread/futures/futures.task/futures.task.nonmembers/uses_allocator.pass.cpp
+++ b/test/std/thread/futures/futures.task/futures.task.nonmembers/uses_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,9 @@
 #include <future>
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::uses_allocator<std::packaged_task<double(int, char)>, test_allocator<int> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/copy_assign.fail.cpp b/test/std/thread/futures/futures.unique_future/copy_assign.fail.cpp
index d20f0c380..3a1a4d6be 100644
--- a/test/std/thread/futures/futures.unique_future/copy_assign.fail.cpp
+++ b/test/std/thread/futures/futures.unique_future/copy_assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     {
@@ -48,4 +47,6 @@ int main()
         f = f0; // expected-error {{'operator=' is a private member of 'std::__1::future<void>'}}
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/copy_ctor.fail.cpp b/test/std/thread/futures/futures.unique_future/copy_ctor.fail.cpp
index e1d85ac2c..4a8b98c19 100644
--- a/test/std/thread/futures/futures.unique_future/copy_ctor.fail.cpp
+++ b/test/std/thread/futures/futures.unique_future/copy_ctor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     {
@@ -48,4 +47,6 @@ int main()
         std::future<void> f = f0; // expected-error {{calling a private constructor of class 'std::__1::future<void>'}}
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/default.pass.cpp b/test/std/thread/futures/futures.unique_future/default.pass.cpp
index 84cb84650..60ef645e3 100644
--- a/test/std/thread/futures/futures.unique_future/default.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::future<int> f;
@@ -32,4 +31,6 @@ int main()
         std::future<void> f;
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/dtor.pass.cpp b/test/std/thread/futures/futures.unique_future/dtor.pass.cpp
index af908d7e7..ec27219da 100644
--- a/test/std/thread/futures/futures.unique_future/dtor.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 
 #include "test_allocator.h"
 
-int main()
+int main(int, char**)
 {
     assert(test_alloc_base::alloc_count == 0);
     {
@@ -67,4 +66,6 @@ int main()
         assert(f.valid());
     }
     assert(test_alloc_base::alloc_count == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/get.pass.cpp b/test/std/thread/futures/futures.unique_future/get.pass.cpp
index 87a54251e..2e3e32648 100644
--- a/test/std/thread/futures/futures.unique_future/get.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/get.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -62,7 +61,7 @@ void func6(std::promise<void> p)
     p.set_exception(std::make_exception_ptr('c'));
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -151,4 +150,6 @@ int main()
         }
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/move_assign.pass.cpp b/test/std/thread/futures/futures.unique_future/move_assign.pass.cpp
index 4a790b06c..b0f0e2b5c 100644
--- a/test/std/thread/futures/futures.unique_future/move_assign.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -71,4 +70,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/move_ctor.pass.cpp b/test/std/thread/futures/futures.unique_future/move_ctor.pass.cpp
index 14e2eb416..aca5dda64 100644
--- a/test/std/thread/futures/futures.unique_future/move_ctor.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -65,4 +64,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/share.pass.cpp b/test/std/thread/futures/futures.unique_future/share.pass.cpp
index 9b8667e53..979f93ccc 100644
--- a/test/std/thread/futures/futures.unique_future/share.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/share.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <future>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -72,4 +71,6 @@ int main()
         assert(!f0.valid());
         assert(!f.valid());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/wait.pass.cpp b/test/std/thread/futures/futures.unique_future/wait.pass.cpp
index f6de983f3..11fc80868 100644
--- a/test/std/thread/futures/futures.unique_future/wait.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/wait.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@ void func5(std::promise<void> p)
     p.set_value();
 }
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock Clock;
     typedef std::chrono::duration<double, std::milli> ms;
@@ -86,4 +85,6 @@ int main()
         assert(f.valid());
         assert(t1-t0 < ms(5));
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/wait_for.pass.cpp b/test/std/thread/futures/futures.unique_future/wait_for.pass.cpp
index c4f358268..91f962fd1 100644
--- a/test/std/thread/futures/futures.unique_future/wait_for.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/wait_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -44,7 +43,7 @@ void func5(std::promise<void> p)
     p.set_value();
 }
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock Clock;
     {
@@ -95,4 +94,6 @@ int main()
         assert(f.valid());
         assert(t1-t0 < ms(50));
     }
+
+  return 0;
 }
diff --git a/test/std/thread/futures/futures.unique_future/wait_until.pass.cpp b/test/std/thread/futures/futures.unique_future/wait_until.pass.cpp
index 541c00860..28d9b638a 100644
--- a/test/std/thread/futures/futures.unique_future/wait_until.pass.cpp
+++ b/test/std/thread/futures/futures.unique_future/wait_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -61,7 +60,7 @@ void func5(std::promise<void> p)
     set_worker_thread_state(WorkerThreadState::Exiting);
 }
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock Clock;
     {
@@ -127,4 +126,6 @@ int main()
         assert(f.valid());
         assert(t1-t0 < ms(5));
     }
+
+  return 0;
 }
diff --git a/test/std/thread/macro.pass.cpp b/test/std/thread/macro.pass.cpp
index c1b1377d6..640db4aaa 100644
--- a/test/std/thread/macro.pass.cpp
+++ b/test/std/thread/macro.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -15,9 +14,11 @@
 
 #include <thread>
 
-int main()
+int main(int, char**)
 {
 #ifndef __STDCPP_THREADS__
 #error __STDCPP_THREADS__ is not defined
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/cv_status.pass.cpp b/test/std/thread/thread.condition/cv_status.pass.cpp
index fe5fa05ad..af980c3ee 100644
--- a/test/std/thread/thread.condition/cv_status.pass.cpp
+++ b/test/std/thread/thread.condition/cv_status.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,8 +15,10 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(static_cast<int>(std::cv_status::no_timeout) == 0);
     assert(static_cast<int>(std::cv_status::timeout)    == 1);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/notify_all_at_thread_exit.pass.cpp b/test/std/thread/thread.condition/notify_all_at_thread_exit.pass.cpp
index 02da345cb..9a0e51e3b 100644
--- a/test/std/thread/thread.condition/notify_all_at_thread_exit.pass.cpp
+++ b/test/std/thread/thread.condition/notify_all_at_thread_exit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -37,7 +36,7 @@ void func()
     std::this_thread::sleep_for(ms(300));
 }
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<std::mutex> lk(mut);
     std::thread t(func);
@@ -46,4 +45,6 @@ int main()
     Clock::time_point t1 = Clock::now();
     assert(t1-t0 > ms(250));
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/assign.fail.cpp b/test/std/thread/thread.condition/thread.condition.condvar/assign.fail.cpp
index e88550c5b..a367051fe 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/assign.fail.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::condition_variable cv0;
     std::condition_variable cv1;
     cv1 = cv0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/copy.fail.cpp b/test/std/thread/thread.condition/thread.condition.condvar/copy.fail.cpp
index 24d6ee0e7..f9d607657 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/copy.fail.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::condition_variable cv0;
     std::condition_variable cv1(cv0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/default.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/default.pass.cpp
index 6f43564c3..aab97f9e1 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/default.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,9 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::condition_variable cv;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/destructor.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/destructor.pass.cpp
index 437ed965b..6550109fd 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/destructor.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/destructor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -44,7 +43,7 @@ void g()
         cv->wait(lk);
 }
 
-int main()
+int main(int, char**)
 {
     cv = new std::condition_variable;
     std::thread th2(g);
@@ -55,4 +54,6 @@ int main()
     std::thread th1(f);
     th1.join();
     th2.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/notify_all.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/notify_all.pass.cpp
index fd80ee99c..46c53a863 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/notify_all.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/notify_all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -47,7 +46,7 @@ void f2()
     test2 = 2;
 }
 
-int main()
+int main(int, char**)
 {
     std::thread t1(f1);
     std::thread t2(f2);
@@ -66,4 +65,6 @@ int main()
     t2.join();
     assert(test1 == 2);
     assert(test2 == 2);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/notify_one.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/notify_one.pass.cpp
index e99ebee9c..eb1de67db 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/notify_one.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/notify_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -48,7 +47,7 @@ void f2()
     test2 = 2;
 }
 
-int main()
+int main(int, char**)
 {
     std::thread t1(f1);
     std::thread t2(f2);
@@ -96,4 +95,6 @@ int main()
     }
     else
         assert(false);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/wait.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/wait.pass.cpp
index 236eecc91..03bcfeea9 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/wait.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/wait.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -37,7 +36,7 @@ void f()
     assert(test2 != 0);
 }
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<std::mutex>lk(mut);
     std::thread t(f);
@@ -49,4 +48,6 @@ int main()
     lk.unlock();
     cv.notify_one();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/wait_for.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/wait_for.pass.cpp
index ca48eee19..505997fff 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/wait_for.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/wait_for.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <condition_variable>
 
 // class condition_variable;
@@ -58,7 +59,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unique_lock<std::mutex>lk(mut);
@@ -84,4 +85,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/wait_for_pred.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/wait_for_pred.pass.cpp
index 9c0af8086..e92ce4583 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/wait_for_pred.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/wait_for_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -67,7 +66,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unique_lock<std::mutex>lk(mut);
@@ -93,4 +92,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/wait_pred.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/wait_pred.pass.cpp
index 45e0b8124..0de8524ed 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/wait_pred.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/wait_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -47,7 +46,7 @@ void f()
     assert(test2 != 0);
 }
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<std::mutex>lk(mut);
     std::thread t(f);
@@ -59,4 +58,6 @@ int main()
     lk.unlock();
     cv.notify_one();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/wait_until.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/wait_until.pass.cpp
index d87a188e9..7f1bdf827 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/wait_until.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/wait_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -73,7 +72,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unique_lock<std::mutex>lk(mut);
@@ -99,4 +98,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvar/wait_until_pred.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvar/wait_until_pred.pass.cpp
index 90ffb1d0b..f21b1b54b 100644
--- a/test/std/thread/thread.condition/thread.condition.condvar/wait_until_pred.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvar/wait_until_pred.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <condition_variable>
 
 // class condition_variable;
@@ -84,7 +85,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::unique_lock<std::mutex>lk(mut);
@@ -110,4 +111,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/assign.fail.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/assign.fail.cpp
index 0b8d8e965..0c2adc9a5 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/assign.fail.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::condition_variable_any cv0;
     std::condition_variable_any cv1;
     cv1 = cv0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/copy.fail.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/copy.fail.cpp
index 84902546d..5aff93ba0 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/copy.fail.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::condition_variable_any cv0;
     std::condition_variable_any cv1(cv0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/default.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/default.pass.cpp
index 210060a74..0c35da032 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/default.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,9 @@
 #include <condition_variable>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::condition_variable_any cv;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/destructor.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/destructor.pass.cpp
index 6bdca7b01..35580d429 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/destructor.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/destructor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -45,7 +44,7 @@ void g()
     m.unlock();
 }
 
-int main()
+int main(int, char**)
 {
     cv = new std::condition_variable_any;
     std::thread th2(g);
@@ -56,4 +55,6 @@ int main()
     std::thread th1(f);
     th1.join();
     th2.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp
index 27ead9568..d12c93602 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/notify_all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -51,7 +50,7 @@ void f2()
     test2 = 2;
 }
 
-int main()
+int main(int, char**)
 {
     std::thread t1(f1);
     std::thread t2(f2);
@@ -70,4 +69,6 @@ int main()
     t2.join();
     assert(test1 == 2);
     assert(test2 == 2);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/notify_one.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/notify_one.pass.cpp
index 98f6c432c..27a0f87e5 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/notify_one.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/notify_one.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <condition_variable>
 
 // class condition_variable_any;
@@ -51,7 +52,7 @@ void f2()
     test2 = 2;
 }
 
-int main()
+int main(int, char**)
 {
     std::thread t1(f1);
     std::thread t2(f2);
@@ -95,4 +96,6 @@ int main()
     }
     else
         assert(false);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/wait.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/wait.pass.cpp
index f5c8926e3..a3b2e87c9 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/wait.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/wait.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,7 +41,7 @@ void f()
     assert(test2 != 0);
 }
 
-int main()
+int main(int, char**)
 {
     L1 lk(m0);
     std::thread t(f);
@@ -54,4 +53,6 @@ int main()
     lk.unlock();
     cv.notify_one();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/wait_for.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/wait_for.pass.cpp
index a4b4ed991..d472a698f 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/wait_for.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/wait_for.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <condition_variable>
 
 // class condition_variable_any;
@@ -61,7 +62,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         L1 lk(m0);
@@ -87,4 +88,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp
index 47da78833..cbf0193ad 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -71,7 +70,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         expect_result = true;
@@ -99,4 +98,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/wait_pred.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/wait_pred.pass.cpp
index 921ad69f1..eafc434d0 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/wait_pred.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/wait_pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -51,7 +50,7 @@ void f()
     assert(test2 != 0);
 }
 
-int main()
+int main(int, char**)
 {
     L1 lk(m0);
     std::thread t(f);
@@ -63,4 +62,6 @@ int main()
     lk.unlock();
     cv.notify_one();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp
index 71cbc94a7..8afa05159 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/wait_terminates.sh.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -110,7 +109,7 @@ void signal_me() {
 typedef std::chrono::system_clock Clock;
 typedef std::chrono::milliseconds MS;
 
-int main(int argc, char** argv) {
+int main(int argc, char **argv) {
   assert(argc == 2);
   int id = std::stoi(argv[1]);
   assert(id >= 1 && id <= 6);
@@ -131,4 +130,6 @@ int main(int argc, char** argv) {
     }
   } catch (...) {}
   assert(false);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp
index 1994ebdfe..e14944906 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -76,7 +75,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         L1 lk(m0);
@@ -102,4 +101,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_pred.pass.cpp b/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_pred.pass.cpp
index c0fea0355..5eb253a75 100644
--- a/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_pred.pass.cpp
+++ b/test/std/thread/thread.condition/thread.condition.condvarany/wait_until_pred.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <condition_variable>
 
 // class condition_variable_any;
@@ -88,7 +89,7 @@ void f()
     ++runs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         L1 lk(m0);
@@ -114,4 +115,6 @@ int main()
         lk.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.general/nothing_to_do.pass.cpp b/test/std/thread/thread.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.general/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
index a0071cd65..207b0753e 100644
--- a/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock.algorithm/lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -93,7 +92,7 @@ public:
     bool locked() const {return locked_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         L0 l0;
@@ -519,4 +518,6 @@ int main()
     }
 #endif  // TEST_HAS_NO_EXCEPTIONS
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock.algorithm/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock.algorithm/try_lock.pass.cpp
index 0f5f5591f..50ff29ce9 100644
--- a/test/std/thread/thread.mutex/thread.lock.algorithm/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock.algorithm/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -73,7 +72,7 @@ public:
     bool locked() const {return locked_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         L0 l0;
@@ -523,4 +522,6 @@ int main()
         assert(!l3.locked());
     }
 #endif  // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
index 83271009a..fc76eb34e 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <mutex>
 
 // template <class Mutex> class lock_guard;
@@ -41,11 +42,13 @@ void f()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/assign.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/assign.fail.cpp
index 53abb42c0..2d0f438ed 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,11 +14,13 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::mutex m0;
     std::mutex m1;
     std::lock_guard<std::mutex> lg0(m0);
     std::lock_guard<std::mutex> lg(m1);
     lg = lg0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/copy.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/copy.fail.cpp
index 296ccdaee..e99517e47 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::mutex m;
     std::lock_guard<std::mutex> lg0(m);
     std::lock_guard<std::mutex> lg(lg0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp
index 520c9730b..383c1539a 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,8 +16,10 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::mutex m;
     std::lock_guard<std::mutex> lg = m; // expected-error{{no viable conversion}}
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
index 97f9d07c1..fa6aa4615 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <mutex>
 
 // template <class Mutex> class lock_guard;
@@ -45,7 +46,7 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
@@ -57,4 +58,6 @@ int main()
     std::lock_guard lg(m);
     static_assert((std::is_same<decltype(lg), std::lock_guard<decltype(m)>>::value), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/types.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/types.pass.cpp
index 5238ed670..b9cdb4dec 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/types.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,8 +21,10 @@
 #include <mutex>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::lock_guard<std::mutex>::mutex_type,
                    std::mutex>::value), "");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp
index d49ba8d11..63e0626d5 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/adopt_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -32,7 +31,7 @@ struct TestMutex {
     TestMutex& operator=(TestMutex const&) = delete;
 };
 
-int main()
+int main(int, char**)
 {
     {
         using LG = std::scoped_lock<>;
@@ -69,4 +68,6 @@ int main()
         assert(!m1.locked && !m2.locked && !m3.locked);
     }
 
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/assign.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/assign.fail.cpp
index a05472935..66a68bb27 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <mutex>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using M = std::mutex;
     M m0, m1, m2;
@@ -47,4 +46,6 @@ int main()
         LG lg2(om0, om1, om2);
         lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/copy.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/copy.fail.cpp
index 5075a4268..3829d15a6 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <mutex>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using M = std::mutex;
     M m0, m1, m2;
@@ -43,4 +42,6 @@ int main()
         const LG Orig(m0, m1, m2);
         LG Copy(Orig); // expected-error{{call to deleted constructor of 'LG'}}
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.fail.cpp
index 7bb467326..0c9258887 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 template <class LG>
 void test_conversion(LG) {}
 
-int main()
+int main(int, char**)
 {
     using M = std::mutex;
     M m0, m1, m2;
@@ -50,4 +49,6 @@ int main()
         LG lg = {m0, m1, m2}; // expected-error{{chosen constructor is explicit in copy-initialization}}
         test_conversion<LG>({n0, n1, n2}); // expected-error{{no matching function for call}}
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.pass.cpp
index cdf3ceeb6..3a633c39b 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/mutex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -62,7 +61,7 @@ struct TestMutexThrows {
 };
 #endif // !defined(TEST_HAS_NO_EXCEPTIONS)
 
-int main()
+int main(int, char**)
 {
     {
         using LG = std::scoped_lock<>;
@@ -152,4 +151,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/types.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/types.pass.cpp
index 6af3c6c95..62621fcca 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/types.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.scoped/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -37,7 +36,7 @@ constexpr bool has_mutex_type() {
     return !std::is_same<decltype(test_typedef<LG>(0)), NAT>::value;
 }
 
-int main()
+int main(int, char**)
 {
     {
         using T = std::scoped_lock<>;
@@ -75,4 +74,6 @@ int main()
         using T = std::scoped_lock<M1, M1, M1>;
         static_assert(!has_mutex_type<T>(), "");
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_assign.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_assign.fail.cpp
index 79f43e860..1b31fbc50 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 std::shared_timed_mutex m0;
 std::shared_timed_mutex m1;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<std::shared_timed_mutex> lk0(m0);
     std::shared_lock<std::shared_timed_mutex> lk1(m1);
     lk1 = lk0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_ctor.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_ctor.fail.cpp
index d6bf57947..48da3c715 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_ctor.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/copy_ctor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,8 +17,10 @@
 
 std::shared_timed_mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<std::shared_timed_mutex> lk0(m);
     std::shared_lock<std::shared_timed_mutex> lk = lk0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
index f7cf49c81..0543ae72e 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,9 +18,11 @@
 #include <shared_mutex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<std::shared_timed_mutex> ul;
     assert(!ul.owns_lock());
     assert(ul.mutex() == nullptr);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
index ee36e84c0..999d65f02 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 #include "nasty_containers.hpp"
 
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::shared_timed_mutex M;
@@ -47,4 +46,6 @@ int main()
     assert(lk0.mutex() == nullptr);
     assert(lk0.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
index c29a3fb04..1f61e21fb 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "nasty_containers.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::shared_timed_mutex M;
@@ -42,4 +41,6 @@ int main()
     assert(lk0.mutex() == nullptr);
     assert(lk0.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
index ac338064d..14c084f00 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -72,7 +71,7 @@ void g()
     assert(d < Tolerance);  // within tolerance
 }
 
-int main()
+int main(int, char**)
 {
     std::vector<std::thread> v;
     {
@@ -100,4 +99,6 @@ int main()
     std::shared_lock sl(m);
     static_assert((std::is_same<decltype(sl), std::shared_lock<decltype(m)>>::value), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
index 341f0ce7e..86d54b508 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_adopt_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "nasty_containers.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::shared_timed_mutex M;
@@ -38,4 +37,6 @@ int main()
     assert(lk.mutex() == std::addressof(m));
     assert(lk.owns_lock() == true);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
index 5fbb7244e..5a085d2e6 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_defer_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 #include <cassert>
 #include "nasty_containers.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::shared_timed_mutex M;
@@ -36,4 +35,6 @@ int main()
     assert(lk.mutex() == std::addressof(m));
     assert(lk.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
index 839e12dba..3228f938f 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -67,7 +66,7 @@ void f2()
     assert(d < Tolerance);  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -89,4 +88,6 @@ int main()
         for (auto& t : v)
             t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
index 9401cea2e..f62e73944 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_time_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -66,7 +65,7 @@ void f2()
     assert(d < Tolerance);  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -88,4 +87,6 @@ int main()
         for (auto& t : v)
             t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
index 7f89f0af8..7dd7c16fe 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex_try_to_lock.pass.cpp
@@ -1,15 +1,16 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
 
+// FLAKY_TEST.
+
 // <shared_mutex>
 
 // template <class Mutex> class shared_lock;
@@ -56,7 +57,7 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::vector<std::thread> v;
@@ -66,4 +67,6 @@ int main()
     m.unlock();
     for (auto& t : v)
         t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
index 25d78ab19..5f084b212 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp
@@ -1,15 +1,16 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11
 
+// FLAKY_TEST.
+
 // <shared_mutex>
 
 // template <class Mutex> class shared_lock;
@@ -79,7 +80,7 @@ void f()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::vector<std::thread> v;
@@ -89,4 +90,6 @@ int main()
     m.unlock();
     for (auto& t : v)
         t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp
index 06dc11742..488260618 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -35,7 +34,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<mutex> lk(m, std::defer_lock);
     assert(lk.try_lock() == true);
@@ -68,4 +67,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp
index 7feb71390..b2c177683 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,7 +39,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<mutex> lk(m, std::defer_lock);
     assert(lk.try_lock_for(ms(5)) == true);
@@ -73,4 +72,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp
index 836a9ae50..59bcd4a0b 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::steady_clock Clock;
     std::shared_lock<mutex> lk(m, std::defer_lock);
@@ -73,4 +72,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp
index 903b53ace..b0e337bda 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/unlock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<mutex> lk(m);
     lk.unlock();
@@ -60,4 +59,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/member_swap.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/member_swap.pass.cpp
index 23a0c7030..ce385ddbd 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/member_swap.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -27,7 +26,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<mutex> lk1(m);
     std::shared_lock<mutex> lk2;
@@ -37,4 +36,6 @@ int main()
     assert(lk2.mutex() == &m);
     assert(lk2.owns_lock() == true);
     static_assert(noexcept(lk1.swap(lk2)), "member swap must be noexcept");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/nonmember_swap.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/nonmember_swap.pass.cpp
index 0f19174d5..cec13f0f2 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/nonmember_swap.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<mutex> lk1(m);
     std::shared_lock<mutex> lk2;
@@ -38,4 +37,6 @@ int main()
     assert(lk2.mutex() == &m);
     assert(lk2.owns_lock() == true);
     static_assert(noexcept(swap(lk1, lk2)), "non-member swap must be noexcept");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/release.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/release.pass.cpp
index 2b5f8c1f1..f2e5820cf 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/release.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.mod/release.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -32,7 +31,7 @@ int mutex::unlock_count = 0;
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<mutex> lk(m);
     assert(lk.mutex() == &m);
@@ -45,4 +44,6 @@ int main()
     assert(mutex::lock_count == 1);
     assert(mutex::unlock_count == 0);
     static_assert(noexcept(lk.release()), "release must be noexcept");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
index 711ab7c6f..867bae0e3 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/mutex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 
 std::shared_timed_mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<std::shared_timed_mutex> lk0;
     assert(lk0.mutex() == nullptr);
@@ -30,4 +29,6 @@ int main()
     lk1.unlock();
     assert(lk1.mutex() == &m);
     static_assert(noexcept(lk0.mutex()), "mutex() must be noexcept");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/op_bool.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/op_bool.pass.cpp
index 3f6ad2b55..82d737ee5 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/op_bool.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/op_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 
 std::shared_timed_mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<std::shared_timed_mutex> lk0;
     assert(static_cast<bool>(lk0) == false);
@@ -30,4 +29,6 @@ int main()
     lk1.unlock();
     assert(static_cast<bool>(lk1) == false);
     static_assert(noexcept(static_cast<bool>(lk0)), "explicit operator bool() must be noexcept");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
index 5ab3ac009..f949684e8 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.obs/owns_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 
 std::shared_timed_mutex m;
 
-int main()
+int main(int, char**)
 {
     std::shared_lock<std::shared_timed_mutex> lk0;
     assert(lk0.owns_lock() == false);
@@ -30,4 +29,6 @@ int main()
     lk1.unlock();
     assert(lk1.owns_lock() == false);
     static_assert(noexcept(lk0.owns_lock()), "owns_lock must be noexcept");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/types.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/types.pass.cpp
index f555d3de5..44d19e8db 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/types.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -24,8 +23,10 @@
 #include <shared_mutex>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::shared_lock<std::mutex>::mutex_type,
                    std::mutex>::value), "");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_assign.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_assign.fail.cpp
index 4ecd6c041..799cb61f9 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <mutex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::mutex M;
@@ -30,4 +29,6 @@ int main()
     assert(lk0.mutex() == nullptr);
     assert(lk0.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_ctor.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_ctor.fail.cpp
index 067302127..e258198e6 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_ctor.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/copy_ctor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <mutex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::mutex M;
@@ -28,4 +27,6 @@ int main()
     assert(lk0.mutex() == nullptr);
     assert(lk0.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/default.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/default.pass.cpp
index a49bc5071..74b265141 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,9 +17,11 @@
 #include <mutex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<std::mutex> ul;
     assert(!ul.owns_lock());
     assert(ul.mutex() == nullptr);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_assign.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_assign.pass.cpp
index 2d5feabf8..1e663766b 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_assign.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "nasty_containers.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::mutex M;
@@ -45,4 +44,6 @@ int main()
     assert(lk0.mutex() == nullptr);
     assert(lk0.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_ctor.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_ctor.pass.cpp
index 04aa79673..8ea0a1f2d 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_ctor.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "nasty_containers.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::mutex M;
@@ -41,4 +40,6 @@ int main()
     assert(lk0.mutex() == nullptr);
     assert(lk0.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
index dcfdfd11a..61c0dacf1 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <mutex>
 
 // template <class Mutex> class unique_lock;
@@ -45,7 +46,7 @@ void f()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
@@ -57,4 +58,6 @@ int main()
     std::unique_lock ul(m);
     static_assert((std::is_same<decltype(ul), std::unique_lock<decltype(m)>>::value), "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp
index 20f7d249b..d957c6d24 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_adopt_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "nasty_containers.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::mutex M;
@@ -37,4 +36,6 @@ int main()
     assert(lk.mutex() == std::addressof(m));
     assert(lk.owns_lock() == true);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp
index 242dacb1e..af6853160 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "nasty_containers.hpp"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::mutex M;
@@ -35,4 +34,6 @@ int main()
     assert(lk.mutex() == std::addressof(m));
     assert(lk.owns_lock() == false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp
index 0939a5792..8699dd554 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -51,7 +50,7 @@ void f2()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -67,4 +66,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp
index ceb293701..ab46dacad 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -51,7 +50,7 @@ void f2()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -67,4 +66,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp
index cea58c554..448be8e7e 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -54,11 +53,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
index cb5c55925..b8a0c2d34 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <mutex>
 
 // template <class Mutex> class unique_lock;
@@ -65,11 +66,13 @@ void f()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp
index 3f7bd25a5..a6247df7e 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -34,7 +33,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<mutex> lk(m, std::defer_lock);
     assert(lk.try_lock() == true);
@@ -67,4 +66,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp
index b73590441..a6166ceda 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -39,7 +38,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<mutex> lk(m, std::defer_lock);
     assert(lk.try_lock_for(ms(5)) == true);
@@ -72,4 +71,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp
index c8d0aad6f..6c7da1c0c 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -38,7 +37,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::steady_clock Clock;
     std::unique_lock<mutex> lk(m, std::defer_lock);
@@ -72,4 +71,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp
index 124ff551f..1f0a0e529 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/unlock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<mutex> lk(m);
     lk.unlock();
@@ -59,4 +58,6 @@ int main()
         assert(e.code().value() == EPERM);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/member_swap.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/member_swap.pass.cpp
index 598d53a65..707755f59 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/member_swap.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -26,7 +25,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<mutex> lk1(m);
     std::unique_lock<mutex> lk2;
@@ -35,4 +34,6 @@ int main()
     assert(lk1.owns_lock() == false);
     assert(lk2.mutex() == &m);
     assert(lk2.owns_lock() == true);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/nonmember_swap.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/nonmember_swap.pass.cpp
index 3fc8c28f5..1c05657d6 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/nonmember_swap.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/nonmember_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -27,7 +26,7 @@ struct mutex
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<mutex> lk1(m);
     std::unique_lock<mutex> lk2;
@@ -36,4 +35,6 @@ int main()
     assert(lk1.owns_lock() == false);
     assert(lk2.mutex() == &m);
     assert(lk2.owns_lock() == true);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/release.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/release.pass.cpp
index 89c28e6be..9751149b9 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/release.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/release.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@ int mutex::unlock_count = 0;
 
 mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<mutex> lk(m);
     assert(lk.mutex() == &m);
@@ -43,4 +42,6 @@ int main()
     assert(lk.owns_lock() == false);
     assert(mutex::lock_count == 1);
     assert(mutex::unlock_count == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/mutex.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/mutex.pass.cpp
index bc1e3e5eb..899f965df 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/mutex.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/mutex.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 
 std::mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<std::mutex> lk0;
     assert(lk0.mutex() == nullptr);
@@ -28,4 +27,6 @@ int main()
     assert(lk1.mutex() == &m);
     lk1.unlock();
     assert(lk1.mutex() == &m);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/op_bool.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/op_bool.pass.cpp
index 7004ac009..1affe8deb 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/op_bool.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/op_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 
 std::mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<std::mutex> lk0;
     assert(static_cast<bool>(lk0) == false);
@@ -28,4 +27,6 @@ int main()
     assert(static_cast<bool>(lk1) == true);
     lk1.unlock();
     assert(static_cast<bool>(lk1) == false);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/owns_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/owns_lock.pass.cpp
index f53af35ff..2c5496b29 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/owns_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.obs/owns_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -20,7 +19,7 @@
 
 std::mutex m;
 
-int main()
+int main(int, char**)
 {
     std::unique_lock<std::mutex> lk0;
     assert(lk0.owns_lock() == false);
@@ -28,4 +27,6 @@ int main()
     assert(lk1.owns_lock() == true);
     lk1.unlock();
     assert(lk1.owns_lock() == false);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/types.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/types.pass.cpp
index f8bcb6d0d..7dc093ac6 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/types.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,8 +21,10 @@
 #include <mutex>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::unique_lock<std::mutex>::mutex_type,
                    std::mutex>::value), "");
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.lock/types.pass.cpp b/test/std/thread/thread.mutex/thread.lock/types.pass.cpp
index 5baaee533..150d9b4aa 100644
--- a/test/std/thread/thread.mutex/thread.lock/types.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -22,7 +21,7 @@
 #include <mutex>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     typedef std::defer_lock_t T1;
     typedef std::try_to_lock_t T2;
@@ -31,4 +30,6 @@ int main()
     T1 t1 = std::defer_lock; ((void)t1);
     T2 t2 = std::try_to_lock; ((void)t2);
     T3 t3 = std::adopt_lock; ((void)t3);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/nothing_to_do.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.general/nothing_to_do.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.general/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/nothing_to_do.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/assign.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/assign.fail.cpp
index 7f6333af9..ba09ed1a7 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::mutex m0;
     std::mutex m1;
     m1 = m0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/copy.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/copy.fail.cpp
index 7e1a07ac8..9edfb7267 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::mutex m0;
     std::mutex m1(m0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/default.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/default.pass.cpp
index 48c3a73a0..b5a608eeb 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,8 +17,10 @@
 #include <mutex>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_nothrow_default_constructible<std::mutex>::value, "");
     std::mutex m;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
index ba2d54d58..dcb4b8ff8 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <mutex>
 
 // class mutex;
@@ -40,11 +41,13 @@ void f()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
index fe8f351d7..712215583 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,11 +41,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/assign.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/assign.fail.cpp
index 61b56216e..0cf3c5bca 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::recursive_mutex m0;
     std::recursive_mutex m1;
     m1 = m0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/copy.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/copy.fail.cpp
index 0239c0475..454d77973 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::recursive_mutex m0;
     std::recursive_mutex m1(m0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/default.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/default.pass.cpp
index 8c5d26675..e32c92f0c 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,7 +16,9 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::recursive_mutex m;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp
index abebe9063..f8744a9b7 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,11 +41,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
index ff546d4ad..092343fe7 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -44,11 +43,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/nothing_to_do.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
index 81995f6c8..337fcdf08 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,9 +17,11 @@
 
 #include <shared_mutex>
 
-int main()
+int main(int, char**)
 {
     std::shared_mutex m0;
     std::shared_mutex m1;
     m1 = m0; // expected-error {{overload resolution selected deleted operator '='}}
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
index e4bee4bb7..93d02885a 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,8 +17,10 @@
 
 #include <shared_mutex>
 
-int main()
+int main(int, char**)
 {
     std::shared_mutex m0;
     std::shared_mutex m1(m0); // expected-error {{call to deleted constructor of 'std::shared_mutex'}}
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
index 3ac901520..ecd29b748 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,9 @@
 
 #include <shared_mutex>
 
-int main()
+int main(int, char**)
 {
     std::shared_mutex m;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
index efc4d3254..74c66d0f6 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -54,11 +53,13 @@ void f()
     assert(d < Tolerance);  // within tolerance
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(WaitTime);
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
index 72f74d551..7707af8d8 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -66,7 +65,7 @@ void g()
 }
 
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::vector<std::thread> v;
@@ -85,4 +84,6 @@ int main()
     for (auto& t : v)
         t.join();
     q.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
index f22f44c6d..9d6b558ff 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
@@ -1,15 +1,16 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
+// FLAKY_TEST.
+
 // <shared_mutex>
 
 // class shared_mutex;
@@ -43,11 +44,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
index d2d486a8b..b9538b564 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -47,7 +46,7 @@ void f()
 }
 
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::vector<std::thread> v;
@@ -57,4 +56,6 @@ int main()
     m.unlock();
     for (auto& t : v)
         t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/nothing_to_do.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.fail.cpp
index 0c5bfa804..483111db9 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 
 #include <shared_mutex>
 
-int main()
+int main(int, char**)
 {
     std::shared_timed_mutex m0;
     std::shared_timed_mutex m1;
     m1 = m0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.fail.cpp
index 3656ec62e..7483b1f51 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 
 #include <shared_mutex>
 
-int main()
+int main(int, char**)
 {
     std::shared_timed_mutex m0;
     std::shared_timed_mutex m1(m0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
index a4e7670e7..83b30b98d 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,9 @@
 
 #include <shared_mutex>
 
-int main()
+int main(int, char**)
 {
     std::shared_timed_mutex m;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
index 0e173b0a1..56464b240 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -56,11 +55,13 @@ void f()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
index 753d65d12..08d35861e 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/lock_shared.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -68,7 +67,7 @@ void g()
 }
 
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::vector<std::thread> v;
@@ -87,4 +86,6 @@ int main()
     for (auto& t : v)
         t.join();
     q.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
index fbe3cdcd5..6b2d9a543 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -43,11 +42,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
index e562c99e3..45fea3e96 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -65,7 +64,7 @@ void f2()
     assert(d < Tolerance);  // within tolerance
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -81,4 +80,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
index b5fdbdec3..830445af9 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -55,7 +54,7 @@ void f()
     assert(d < Tolerance);  // within tolerance
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::vector<std::thread> v;
@@ -65,4 +64,6 @@ int main()
     m.unlock();
     for (auto& t : v)
         t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
index 69d71bf48..d89e4aa8c 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -65,7 +64,7 @@ void f2()
     assert(d < Tolerance);  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -87,4 +86,6 @@ int main()
         for (auto& t : v)
             t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
index ba135a957..5898fe41e 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -65,7 +64,7 @@ void f2()
     assert(d < Tolerance);  // within tolerance
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -87,4 +86,6 @@ int main()
         for (auto& t : v)
             t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
index 559cf8f26..9539215c4 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -65,7 +64,7 @@ void f2()
     assert(d < Tolerance);  // within tolerance
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -81,4 +80,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
index 0caea1d09..865ab9254 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until_deadlock_bug.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -48,7 +47,7 @@ void blocked_reader() {
   m.unlock_shared();
 }
 
-int main()
+int main(int, char**)
 {
   typedef std::chrono::steady_clock Clock;
 
@@ -67,4 +66,6 @@ int main()
   t1.join();
   t2.join();
   t3.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/nothing_to_do.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/assign.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/assign.fail.cpp
index 58006833e..d0fabc678 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::timed_mutex m0;
     std::timed_mutex m1;
     m1 = m0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/copy.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/copy.fail.cpp
index 61ba31d86..a3efb2fee 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::timed_mutex m0;
     std::timed_mutex m1(m0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/default.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/default.pass.cpp
index 33320a7e2..c879f192e 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,7 +16,9 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::timed_mutex m;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp
index fe2dd825c..8ef3a8347 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -40,11 +39,13 @@ void f()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
index b32a26645..7398b7f6d 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,11 +41,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp
index 46222a70c..0103cdf64 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -48,7 +47,7 @@ void f2()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -64,4 +63,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.pass.cpp
index 6c9c442ab..350bb767d 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -48,7 +47,7 @@ void f2()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -64,4 +63,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/assign.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/assign.fail.cpp
index ae84be838..44be06d67 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::recursive_timed_mutex m0;
     std::recursive_timed_mutex m1;
     m1 = m0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/copy.fail.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/copy.fail.cpp
index 487d6a8c2..154a0192d 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::recursive_timed_mutex m0;
     std::recursive_timed_mutex m1(m0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/default.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/default.pass.cpp
index 56e1874dc..ee6124c02 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,7 +16,9 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::recursive_timed_mutex m;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp
index 91f747bc1..adb54872e 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/lock.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: libcpp-has-no-threads
 
+// FLAKY_TEST.
+
 // <mutex>
 
 // class recursive_timed_mutex;
@@ -42,11 +43,13 @@ void f()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
index 63c3cfee3..05b22c0de 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -44,11 +43,13 @@ void f()
     assert(d < ms(200));  // within 200ms
 }
 
-int main()
+int main(int, char**)
 {
     m.lock();
     std::thread t(f);
     std::this_thread::sleep_for(ms(250));
     m.unlock();
     t.join();
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp
index 3c1d6ddc6..9e5ad5ee9 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_for.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -50,7 +49,7 @@ void f2()
     assert(d < ns(50000000));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -66,4 +65,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_until.pass.cpp b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_until.pass.cpp
index 066eb7b30..f6b9d106a 100644
--- a/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_until.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -50,7 +49,7 @@ void f2()
     assert(d < ms(50));  // within 50ms
 }
 
-int main()
+int main(int, char**)
 {
     {
         m.lock();
@@ -66,4 +65,6 @@ int main()
         m.unlock();
         t.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.once/nothing_to_do.pass.cpp b/test/std/thread/thread.mutex/thread.once/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.mutex/thread.once/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.once/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp b/test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp
index dfd2f10b7..398ee058c 100644
--- a/test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -187,7 +186,7 @@ struct RefQual
 
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     // check basic functionality
     {
@@ -254,4 +253,6 @@ int main()
         assert(rq.rv_called == 1);
     }
 #endif  // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.once/thread.once.callonce/race.pass.cpp b/test/std/thread/thread.mutex/thread.once/thread.once.callonce/race.pass.cpp
index 33215819f..511aa3e80 100644
--- a/test/std/thread/thread.mutex/thread.once/thread.once.callonce/race.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.once/thread.once.callonce/race.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -38,11 +37,13 @@ void f0()
     assert(global == 1);
 }
 
-int main()
+int main(int, char**)
 {
     std::thread t0(f0);
     std::thread t1(f0);
     t0.join();
     t1.join();
     assert(global == 1);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/assign.fail.cpp b/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/assign.fail.cpp
index c47142764..40d408d54 100644
--- a/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/assign.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/assign.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +14,11 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::once_flag f;
     std::once_flag f2;
     f2 = f;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/copy.fail.cpp b/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/copy.fail.cpp
index 450ba8361..9b7c19a96 100644
--- a/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/copy.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <mutex>
 
-int main()
+int main(int, char**)
 {
     std::once_flag f;
     std::once_flag f2(f);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp b/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp
index 62f1b784b..28d93dc7f 100644
--- a/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp
+++ b/test/std/thread/thread.mutex/thread.once/thread.once.onceflag/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <mutex>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::once_flag f;
@@ -28,4 +27,6 @@ int main()
     (void)f;
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/nothing_to_do.pass.cpp b/test/std/thread/thread.req/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.exception/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.exception/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.exception/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.exception/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.lockable/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.lockable/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.lockable/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.lockable/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.basic/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.basic/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.basic/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.basic/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.general/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.general/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.req/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.req/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.req/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.req/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.timed/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.timed/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.timed/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.lockable/thread.req.lockable.timed/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.native/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.native/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.native/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.native/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.paramname/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.paramname/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.paramname/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.paramname/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.req/thread.req.timing/nothing_to_do.pass.cpp b/test/std/thread/thread.req/thread.req.timing/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/thread/thread.req/thread.req.timing/nothing_to_do.pass.cpp
+++ b/test/std/thread/thread.req/thread.req.timing/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.algorithm/swap.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.algorithm/swap.pass.cpp
index 4d3a742dd..68f20d753 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.algorithm/swap.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.algorithm/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,7 +41,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -55,4 +54,6 @@ int main()
         assert(t1.get_id() == id0);
         t1.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/copy.fail.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/copy.fail.cpp
index 7373886f6..e67ceea5d 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/copy.fail.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,11 +40,13 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         std::thread t0(G());
         std::thread t1;
         t1 = t0;
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move.pass.cpp
index d3478818c..cbc32c8c2 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,7 +41,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         assert(G::n_alive == 0);
@@ -60,4 +59,6 @@ int main()
         assert(G::n_alive == 0);
         assert(G::op_run);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move2.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move2.pass.cpp
index e452ac98c..81c6d77e8 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move2.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.assign/move2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -52,7 +51,7 @@ void f1()
     std::_Exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     std::set_terminate(f1);
     {
@@ -62,4 +61,6 @@ int main()
         t0 = std::move(t1);
         assert(false);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/F.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/F.pass.cpp
index be3fc9c5d..13c69180a 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/F.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/F.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -145,7 +144,7 @@ void test_throwing_new_during_thread_creation() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_throwing_new_during_thread_creation();
     {
@@ -201,4 +200,6 @@ int main()
         t.join();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/constr.fail.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/constr.fail.cpp
index 54fc0b802..26231373f 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/constr.fail.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/constr.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     volatile std::thread t1;
     std::thread t2 ( t1, 1, 2.0 );
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/copy.fail.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/copy.fail.cpp
index f66474c93..2a3632cd4 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/copy.fail.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         assert(G::n_alive == 0);
@@ -63,4 +62,6 @@ int main()
         assert(G::n_alive == 0);
         assert(G::op_run);
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/default.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/default.pass.cpp
index 64d5a935b..135d3ceba 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/default.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,8 +17,10 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread t;
     assert(t.get_id() == std::thread::id());
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/move.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/move.pass.cpp
index f349e4c56..25703b2c3 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/move.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.constr/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -51,7 +50,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -67,4 +66,6 @@ int main()
         assert(G::op_run);
     }
     assert(G::n_alive == 0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp
index 0efb7713e..320b4459b 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.destr/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -48,7 +47,7 @@ void f1()
     std::_Exit(0);
 }
 
-int main()
+int main(int, char**)
 {
     std::set_terminate(f1);
     {
@@ -61,4 +60,6 @@ int main()
         }
     }
     assert(false);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/assign.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/assign.pass.cpp
index 585f7ea98..fb4b7eb5a 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/assign.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,7 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread::id id0;
     std::thread::id id1;
@@ -26,4 +25,6 @@ int main()
     assert(id1 == id0);
     id1 = std::this_thread::get_id();
     assert(id1 != id0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/copy.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/copy.pass.cpp
index e8c38016b..f95617b4f 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/copy.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,9 +17,11 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread::id id0;
     std::thread::id id1 = id0;
     assert(id1 == id0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/default.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/default.pass.cpp
index 0037deb1d..32a083ca8 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/default.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,8 +17,10 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread::id id;
     assert(id == std::thread::id());
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/enabled_hashes.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/enabled_hashes.pass.cpp
index 9799467c4..3858508e1 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/enabled_hashes.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/enabled_hashes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
   {
     test_hash_enabled_for_type<std::thread::id>();
   }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/eq.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/eq.pass.cpp
index 6dd4c3ec4..5c557fddc 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/eq.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread::id id0;
     std::thread::id id1;
@@ -29,4 +28,6 @@ int main()
     id1 = std::this_thread::get_id();
     assert(!(id1 == id0));
     assert( (id1 != id0));
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/lt.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/lt.pass.cpp
index de52b1d00..8af73045a 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/lt.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,7 +20,7 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread::id id0;
     std::thread::id id1;
@@ -40,4 +39,6 @@ int main()
       assert( (id0 >  id2));
       assert( (id0 >= id2));
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp
index 126965fe3..a1541c12e 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/stream.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -21,9 +20,11 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread::id id0 = std::this_thread::get_id();
     std::ostringstream os;
     os << id0;
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/thread_id.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/thread_id.pass.cpp
index 4f1491dec..80bcbf97c 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/thread_id.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.id/thread_id.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::thread::id id1;
     std::thread::id id2 = std::this_thread::get_id();
@@ -35,4 +34,6 @@ int main()
     ASSERT_NOEXCEPT(H()(id2));
     H h;
     assert(h(id1) != h(id2));
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/detach.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/detach.pass.cpp
index 3dd7c6a60..bf72e3437 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/detach.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/detach.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -62,7 +61,7 @@ bool G::op_run = false;
 
 void foo() {}
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -87,4 +86,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/get_id.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/get_id.pass.cpp
index f9f38c85f..006bc1e65 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/get_id.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/get_id.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,7 +41,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -55,4 +54,6 @@ int main()
         assert(t1.get_id() == std::thread::id());
         t0.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/join.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/join.pass.cpp
index f0c3ef74c..b64a111c6 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/join.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/join.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -47,7 +46,7 @@ bool G::op_run = false;
 
 void foo() {}
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -74,4 +73,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/joinable.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/joinable.pass.cpp
index b97839c32..6f1308cba 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/joinable.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/joinable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,7 +41,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -51,4 +50,6 @@ int main()
         t0.join();
         assert(!t0.joinable());
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/swap.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/swap.pass.cpp
index 49d4618e8..f43805d7f 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/swap.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.member/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -42,7 +41,7 @@ public:
 int G::n_alive = 0;
 bool G::op_run = false;
 
-int main()
+int main(int, char**)
 {
     {
         G g;
@@ -55,4 +54,6 @@ int main()
         assert(t1.get_id() == id0);
         t1.join();
     }
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.class/thread.thread.static/hardware_concurrency.pass.cpp b/test/std/thread/thread.threads/thread.thread.class/thread.thread.static/hardware_concurrency.pass.cpp
index 4d1ffad45..5493f27a4 100644
--- a/test/std/thread/thread.threads/thread.thread.class/thread.thread.static/hardware_concurrency.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.class/thread.thread.static/hardware_concurrency.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,7 +17,9 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::thread::hardware_concurrency() > 0);
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.this/get_id.pass.cpp b/test/std/thread/thread.threads/thread.thread.this/get_id.pass.cpp
index 3b4b7823a..1bf46cdb5 100644
--- a/test/std/thread/thread.threads/thread.thread.this/get_id.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.this/get_id.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,8 +15,10 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::thread::id id = std::this_thread::get_id();
     assert(id != std::thread::id());
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.this/sleep_for_tested_elsewhere.pass.cpp b/test/std/thread/thread.threads/thread.thread.this/sleep_for_tested_elsewhere.pass.cpp
index 3406fff70..7c8552ea8 100644
--- a/test/std/thread/thread.threads/thread.thread.this/sleep_for_tested_elsewhere.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.this/sleep_for_tested_elsewhere.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,6 +16,8 @@
 // is therefore non-standard. For this reason the test lives under the 'libcxx'
 // subdirectory.
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp b/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
index 0a5a3e419..c73144db0 100644
--- a/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.this/sleep_until.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -19,7 +18,7 @@
 #include <cstdlib>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef Clock::time_point time_point;
@@ -31,4 +30,6 @@ int main()
     std::chrono::nanoseconds err = 5 * ms / 100;
     // The time slept is within 5% of 500ms
     assert(std::abs(ns.count()) < err.count());
+
+  return 0;
 }
diff --git a/test/std/thread/thread.threads/thread.thread.this/yield.pass.cpp b/test/std/thread/thread.threads/thread.thread.this/yield.pass.cpp
index daf5b0cf7..6f772b5c2 100644
--- a/test/std/thread/thread.threads/thread.thread.this/yield.pass.cpp
+++ b/test/std/thread/thread.threads/thread.thread.this/yield.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,7 +15,9 @@
 #include <thread>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::this_thread::yield();
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/allocs.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/allocs.pass.cpp
index f18ed6e2b..961eda3ac 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/allocs.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/allocs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -114,4 +113,6 @@ int main()
              std::scoped_allocator_adaptor<A1<int>>,
              std::scoped_allocator_adaptor<A2<int>>>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_copy.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_copy.pass.cpp
index 8fbbcebe1..d3734cae1 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_copy.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<double>> B;
@@ -65,4 +64,6 @@ int main()
         assert(a2 == a1);
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_move.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_move.pass.cpp
index 8b585e5f6..427e29957 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_move.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/converting_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<double>> B;
@@ -70,4 +69,6 @@ int main()
         assert(A3<int>::move_called == true);
         assert(a2 == a1);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/copy.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/copy.pass.cpp
index 86f16891a..69b767b90 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/copy.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -65,4 +64,6 @@ int main()
         assert(A3<int>::move_called == false);
         assert(a2 == a1);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/default.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/default.pass.cpp
index b335935e3..fdf21cec3 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/default.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -54,4 +53,6 @@ int main()
         assert(A3<int>::move_called == false);
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.fail.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.fail.cpp
index c5244a0d1..6d644db85 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.fail.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     std::scoped_allocator_adaptor<A1<int>> a;
     a.allocate(10);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.pass.cpp
index dd8cf4273..05a1649e4 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -45,4 +44,6 @@ int main()
         assert(A1<int>::allocate_called == true);
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.fail.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.fail.cpp
index 622147c9c..7cf3d4109 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.fail.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     std::scoped_allocator_adaptor<A1<int>> a;
     a.allocate(10, (const void*)0); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.pass.cpp
index f5ce83aa4..db9338d31 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/allocate_size_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -66,4 +65,6 @@ int main()
         assert(a.allocate(10, (const void*)20) == (int*)20);
         assert(A2<int>::allocate_called == true);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp
index dc629edec..97ae33d91 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -111,7 +110,7 @@ struct F
 
 bool F::constructed = false;
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -185,4 +184,6 @@ int main()
         assert(A3<F>::constructed);
         s->~S();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair.pass.cpp
index 82d63ecad..7aa45f05a 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -136,7 +135,9 @@ void test_with_inner_alloc()
         std::free(ptr);
     }
 }
-int main() {
+int main(int, char**) {
     test_no_inner_alloc();
     test_with_inner_alloc();
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_const_lvalue_pair.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_const_lvalue_pair.pass.cpp
index dfb187b6c..d1a03bc05 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_const_lvalue_pair.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_const_lvalue_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -152,7 +151,9 @@ void test_with_inner_alloc()
         std::free(ptr);
     }
 }
-int main() {
+int main(int, char**) {
     test_no_inner_alloc();
     test_with_inner_alloc();
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_piecewise.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_piecewise.pass.cpp
index 9689fb014..14f413bd8 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_piecewise.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_piecewise.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -153,7 +152,9 @@ void test_with_inner_alloc()
         std::free(ptr);
     }
 }
-int main() {
+int main(int, char**) {
     test_no_inner_alloc();
     test_with_inner_alloc();
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_rvalue.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_rvalue.pass.cpp
index 92df0f6f2..c26b4652c 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_rvalue.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -152,7 +151,9 @@ void test_with_inner_alloc()
         std::free(ptr);
     }
 }
-int main() {
+int main(int, char**) {
     test_no_inner_alloc();
     test_with_inner_alloc();
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_values.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_values.pass.cpp
index 2b7fe3f64..7a4b14956 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_values.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_pair_values.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -144,7 +143,9 @@ void test_with_inner_alloc()
         std::free(ptr);
     }
 }
-int main() {
+int main(int, char**) {
     test_no_inner_alloc();
     test_with_inner_alloc();
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_type.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_type.pass.cpp
index 71421464d..e93f37f41 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_type.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -126,8 +125,10 @@ void test_bullet_three() {
     POuter.reset();
 }
 
-int main() {
+int main(int, char**) {
     test_bullet_one();
     test_bullet_two();
     test_bullet_three();
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/deallocate.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/deallocate.pass.cpp
index 7924140cf..425f00ad4 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/deallocate.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/deallocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -43,4 +42,6 @@ int main()
         assert((A1<int>::deallocate_called == std::pair<int*, std::size_t>((int*)10, 20)));
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/destroy.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/destroy.pass.cpp
index 96850d783..50c9d24f0 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/destroy.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/destroy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ struct B
 
 bool B::constructed = false;
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<B>> A;
@@ -66,4 +65,6 @@ int main()
         assert(A3<S>::destroy_called);
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/inner_allocator.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/inner_allocator.pass.cpp
index 9b892abd8..7e73939f8 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/inner_allocator.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/inner_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -41,4 +40,6 @@ int main()
             std::scoped_allocator_adaptor<A2<int>, A3<int>>(A2<int>(6), A3<int>(8))));
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/max_size.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/max_size.pass.cpp
index 8b88dcc96..de9cf4d0c 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/max_size.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -39,4 +38,6 @@ int main()
         assert(a.max_size() == 200);
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/outer_allocator.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/outer_allocator.pass.cpp
index 238d46017..9a90d17c0 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/outer_allocator.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/outer_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -40,4 +39,6 @@ int main()
         A a(A1<int>(5), A2<int>(6), A3<int>(8));
         assert(a.outer_allocator() == A1<int>(5));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/select_on_container_copy_construction.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/select_on_container_copy_construction.pass.cpp
index 8ee048bb9..8253fee55 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.members/select_on_container_copy_construction.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.members/select_on_container_copy_construction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -51,4 +50,6 @@ int main()
         assert(a2.inner_allocator().inner_allocator().outer_allocator().id() == -1);
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/allocator_pointers.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/allocator_pointers.pass.cpp
index 81c366e06..e17a6e9c5 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/allocator_pointers.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/allocator_pointers.pass.cpp
@@ -1,19 +1,17 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03
+
 #include <scoped_allocator>
 #include <memory>
 #include <cassert>
 
-#include "test_macros.h"
-
-#if TEST_STD_VER >= 11
 // #include <memory>
 //
 // template <class Alloc>
@@ -110,7 +108,7 @@ void test_void_pointer()
 
 struct Foo { int x; };
 
-int main()
+int main(int, char**)
 {
     test_pointer<std::scoped_allocator_adaptor<std::allocator<char>>> ();
     test_pointer<std::scoped_allocator_adaptor<std::allocator<int>>> ();
@@ -119,7 +117,6 @@ int main()
     test_void_pointer<std::scoped_allocator_adaptor<std::allocator<char>>> ();
     test_void_pointer<std::scoped_allocator_adaptor<std::allocator<int>>> ();
     test_void_pointer<std::scoped_allocator_adaptor<std::allocator<Foo>>> ();
+
+  return 0;
 }
-#else
-int main() {}
-#endif
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/inner_allocator_type.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/inner_allocator_type.pass.cpp
index f4c106014..2aa7a9891 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/inner_allocator_type.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/inner_allocator_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<
         std::scoped_allocator_adaptor<A1<int>>::inner_allocator_type,
@@ -34,4 +33,6 @@ int main()
     static_assert((std::is_same<
         std::scoped_allocator_adaptor<A1<int>, A2<int>, A3<int>>::inner_allocator_type,
         std::scoped_allocator_adaptor<A2<int>, A3<int>>>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/is_always_equal.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/is_always_equal.pass.cpp
index 44e8709a8..628505f65 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/is_always_equal.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/is_always_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "allocators.h"
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     // sanity checks
     static_assert( (std::is_same<
@@ -69,4 +68,6 @@ int main()
               std::allocator_traits<A2<int>>::is_always_equal::value &&
               std::allocator_traits<A3<int>>::is_always_equal::value)
         ), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_copy_assignment.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_copy_assignment.pass.cpp
index 4c6aabe21..fea53af29 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_copy_assignment.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_copy_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<
         std::scoped_allocator_adaptor<A1<int>>::propagate_on_container_copy_assignment,
@@ -35,4 +34,6 @@ int main()
         std::scoped_allocator_adaptor<A1<int>, A2<int>, A3<int>>::propagate_on_container_copy_assignment,
         std::true_type>::value), "");
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_move_assignment.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_move_assignment.pass.cpp
index f6f092ba5..d04ea6f1a 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_move_assignment.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_move_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<
         std::scoped_allocator_adaptor<A1<int>>::propagate_on_container_move_assignment,
@@ -35,4 +34,6 @@ int main()
         std::scoped_allocator_adaptor<A1<int>, A2<int>, A3<int>>::propagate_on_container_move_assignment,
         std::true_type>::value), "");
 
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_swap.pass.cpp b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_swap.pass.cpp
index 6b7273e26..fcec67879 100644
--- a/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_swap.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/allocator.adaptor.types/propagate_on_container_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<
         std::scoped_allocator_adaptor<A1<int>>::propagate_on_container_swap,
@@ -34,4 +33,6 @@ int main()
     static_assert((std::is_same<
         std::scoped_allocator_adaptor<A1<int>, A2<int>, A3<int>>::propagate_on_container_swap,
         std::true_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/copy_assign.pass.cpp b/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/copy_assign.pass.cpp
index 2cf548550..1f871876f 100644
--- a/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/copy_assign.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -69,4 +68,6 @@ int main()
         assert(A3<int>::move_called == false);
         assert(aN == a1);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/eq.pass.cpp b/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/eq.pass.cpp
index 4f7a3af12..aaf5c1d59 100644
--- a/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/eq.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -59,4 +58,6 @@ int main()
         assert(a2 != a1);
         assert(!(a2 == a1));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/move_assign.pass.cpp b/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/move_assign.pass.cpp
index 68f5a7ea2..c17c6d384 100644
--- a/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/move_assign.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/scoped.adaptor.operators/move_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::scoped_allocator_adaptor<A1<int>> A;
@@ -69,4 +68,6 @@ int main()
         assert(A3<int>::move_called == true);
         assert(aN == a1);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/allocator.adaptor/types.pass.cpp b/test/std/utilities/allocator.adaptor/types.pass.cpp
index fcc99b191..7820e29ee 100644
--- a/test/std/utilities/allocator.adaptor/types.pass.cpp
+++ b/test/std/utilities/allocator.adaptor/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 
 #include "allocators.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<
         A1<int>,
@@ -97,4 +96,6 @@ int main()
     static_assert((std::is_same<
         std::scoped_allocator_adaptor<A2<int>, A1<int>>::const_void_pointer,
         const void*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.assign/copy.pass.cpp b/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
index c148a39de..d818400c5 100644
--- a/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
+++ b/test/std/utilities/any/any.class/any.assign/copy.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.7
-// XFAIL: availability=macosx10.8
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -192,7 +185,7 @@ void test_copy_assign_throws()
 #endif
 }
 
-int main() {
+int main(int, char**) {
     test_copy_assign<small1, small2>();
     test_copy_assign<large1, large2>();
     test_copy_assign<small, large>();
@@ -202,4 +195,6 @@ int main() {
     test_copy_assign_self();
     test_copy_assign_throws<small_throws_on_copy>();
     test_copy_assign_throws<large_throws_on_copy>();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.assign/move.pass.cpp b/test/std/utilities/any/any.class/any.assign/move.pass.cpp
index 19289cc39..165cc0096 100644
--- a/test/std/utilities/any/any.class/any.assign/move.pass.cpp
+++ b/test/std/utilities/any/any.class/any.assign/move.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -105,7 +98,7 @@ void test_move_assign_noexcept() {
       );
 }
 
-int main() {
+int main(int, char**) {
     test_move_assign_noexcept();
     test_move_assign<small1, small2>();
     test_move_assign<large1, large2>();
@@ -113,4 +106,6 @@ int main() {
     test_move_assign<large, small>();
     test_move_assign_empty<small>();
     test_move_assign_empty<large>();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.assign/value.pass.cpp b/test/std/utilities/any/any.class/any.assign/value.pass.cpp
index d2e226604..8ca93df34 100644
--- a/test/std/utilities/any/any.class/any.assign/value.pass.cpp
+++ b/test/std/utilities/any/any.class/any.assign/value.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -203,7 +196,7 @@ void test_sfinae_constraints() {
     }
 }
 
-int main() {
+int main(int, char**) {
     test_assign_value<small1, small2>();
     test_assign_value<large1, large2>();
     test_assign_value<small, large>();
@@ -214,4 +207,6 @@ int main() {
     test_assign_throws<large_throws_on_copy>();
     test_assign_throws<throws_on_move, /* Move = */ true>();
     test_sfinae_constraints();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.cons/copy.pass.cpp b/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
index 79cac4236..fbb5f181a 100644
--- a/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
+++ b/test/std/utilities/any/any.class/any.cons/copy.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -99,10 +92,12 @@ void test_copy()
     assert(Type::count == 0);
 }
 
-int main() {
+int main(int, char**) {
     test_copy<small>();
     test_copy<large>();
     test_copy_empty();
     test_copy_throws<small_throws_on_copy>();
     test_copy_throws<large_throws_on_copy>();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.cons/default.pass.cpp b/test/std/utilities/any/any.class/any.cons/default.pass.cpp
index ed7a948e0..6cd7b8937 100644
--- a/test/std/utilities/any/any.class/any.cons/default.pass.cpp
+++ b/test/std/utilities/any/any.class/any.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "any_helpers.h"
 #include "count_new.hpp"
 
-int main()
+int main(int, char**)
 {
     using std::any;
     {
@@ -44,4 +43,6 @@ int main()
         any const a;
         assertEmpty(a);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp b/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
index 589b3c46d..bfe86e800 100644
--- a/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
+++ b/test/std/utilities/any/any.class/any.cons/in_place_type.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -188,7 +181,7 @@ void test_constructor_explicit() {
     static_assert(std::is_constructible<std::any, IT, std::initializer_list<int>&, int>::value, "");
 }
 
-int main() {
+int main(int, char**) {
     test_in_place_type<small>();
     test_in_place_type<large>();
     test_in_place_type<small_throws_on_copy>();
@@ -199,4 +192,6 @@ int main() {
     test_in_place_type_decayed();
     test_ctor_sfinae();
     test_constructor_explicit();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.cons/move.pass.cpp b/test/std/utilities/any/any.class/any.cons/move.pass.cpp
index 1310b6b12..3c0780c0a 100644
--- a/test/std/utilities/any/any.class/any.cons/move.pass.cpp
+++ b/test/std/utilities/any/any.class/any.cons/move.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -96,7 +89,7 @@ void test_move() {
     assert(Type::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     // noexcept test
     {
@@ -109,4 +102,6 @@ int main()
     test_move<large>();
     test_move_empty();
     test_move_does_not_throw();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.cons/value.pass.cpp b/test/std/utilities/any/any.class/any.cons/value.pass.cpp
index 83c78923d..e39c7307e 100644
--- a/test/std/utilities/any/any.class/any.cons/value.pass.cpp
+++ b/test/std/utilities/any/any.class/any.cons/value.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -152,11 +145,13 @@ void test_sfinae_constraints() {
     }
 }
 
-int main() {
+int main(int, char**) {
     test_copy_move_value<small>();
     test_copy_move_value<large>();
     test_copy_value_throws<small_throws_on_copy>();
     test_copy_value_throws<large_throws_on_copy>();
     test_move_value_throws();
     test_sfinae_constraints();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp b/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
index fdd3c8334..8a5e43378 100644
--- a/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
+++ b/test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -276,7 +269,7 @@ void test_emplace_sfinae_constraints() {
     }
 }
 
-int main() {
+int main(int, char**) {
     test_emplace_type<small>();
     test_emplace_type<large>();
     test_emplace_type<small_throws_on_copy>();
@@ -289,4 +282,6 @@ int main() {
     test_emplace_throws<SmallThrows>();
     test_emplace_throws<LargeThrows>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp b/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
index 888e3a870..a8ac0d601 100644
--- a/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
+++ b/test/std/utilities/any/any.class/any.modifiers/reset.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -26,7 +19,7 @@
 
 #include "any_helpers.h"
 
-int main()
+int main(int, char**)
 {
     using std::any;
     using std::any_cast;
@@ -68,4 +61,6 @@ int main()
         assertEmpty<large>(a);
         assert(large::count == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp b/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
index 9b5ab5f03..f49511138 100644
--- a/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
+++ b/test/std/utilities/any/any.class/any.modifiers/swap.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -128,7 +121,7 @@ void test_self_swap() {
     assert(large::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test_noexcept();
     test_swap_empty<small>();
@@ -138,4 +131,6 @@ int main()
     test_swap<small, large>();
     test_swap<large, small>();
     test_self_swap();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.observers/has_value.pass.cpp b/test/std/utilities/any/any.class/any.observers/has_value.pass.cpp
index 072ac0677..54b4153c9 100644
--- a/test/std/utilities/any/any.class/any.observers/has_value.pass.cpp
+++ b/test/std/utilities/any/any.class/any.observers/has_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "any_helpers.h"
 
-int main()
+int main(int, char**)
 {
     using std::any;
     // noexcept test
@@ -61,4 +60,6 @@ int main()
         a = l;
         assert(a.has_value());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/any.observers/type.pass.cpp b/test/std/utilities/any/any.class/any.observers/type.pass.cpp
index 984c4137d..bb9089cd8 100644
--- a/test/std/utilities/any/any.class/any.observers/type.pass.cpp
+++ b/test/std/utilities/any/any.class/any.observers/type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <cassert>
 #include "any_helpers.h"
 
-int main()
+int main(int, char**)
 {
     using std::any;
     {
@@ -38,4 +37,6 @@ int main()
         any const a(l);
         assert(a.type() == typeid(large));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.class/not_literal_type.pass.cpp b/test/std/utilities/any/any.class/not_literal_type.pass.cpp
index 91ef5c970..3a275d51e 100644
--- a/test/std/utilities/any/any.class/not_literal_type.pass.cpp
+++ b/test/std/utilities/any/any.class/not_literal_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,6 +15,8 @@
 #include <any>
 #include <type_traits>
 
-int main () {
+int main(int, char**) {
     static_assert(!std::is_literal_type<std::any>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp b/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
index cc118b348..58f58afa9 100644
--- a/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
+++ b/test/std/utilities/any/any.nonmembers/any.cast/any_cast_pointer.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -167,7 +160,7 @@ void test_cast_function_pointer() {
     assert(fn_ptr == test_fn);
 }
 
-int main() {
+int main(int, char**) {
     test_cast_is_noexcept();
     test_cast_return_type();
     test_cast_nullptr();
@@ -176,4 +169,6 @@ int main() {
     test_cast<large>();
     test_cast_non_copyable_type();
     test_cast_function_pointer();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp b/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
index 85ee8fef3..121644480 100644
--- a/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
+++ b/test/std/utilities/any/any.nonmembers/any.cast/any_cast_reference.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -310,7 +303,7 @@ void test_cast_to_value() {
     assert(Type::count == 0);
 }
 
-int main() {
+int main(int, char**) {
     test_cast_is_not_noexcept();
     test_cast_return_type();
     test_cast_empty();
@@ -318,4 +311,6 @@ int main() {
     test_cast_to_reference<large>();
     test_cast_to_value<small>();
     test_cast_to_value<large>();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp b/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
index 0e3b6a43f..396d994d2 100644
--- a/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
+++ b/test/std/utilities/any/any.nonmembers/any.cast/any_cast_request_invalid_value_category.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,9 +61,11 @@ void test_rvalue_any_cast_request_lvalue()
     any_cast<int&>(42);
 }
 
-int main()
+int main(int, char**)
 {
     test_const_lvalue_cast_request_non_const_lvalue();
     test_lvalue_any_cast_request_rvalue();
     test_rvalue_any_cast_request_lvalue();
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.fail.cpp b/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.fail.cpp
index cb9244990..8669de4fd 100644
--- a/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.fail.cpp
+++ b/test/std/utilities/any/any.nonmembers/any.cast/const_correctness.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct TestType2 {};
 // is triggered by these tests.
 // expected-error@const_correctness.fail.cpp:* 0+ {{call to unavailable function 'any_cast': introduced in macOS 10.14}}
 
-int main()
+int main(int, char**)
 {
     using std::any;
     using std::any_cast;
@@ -47,4 +46,6 @@ int main()
     // expected-error@any:* {{cannot cast from lvalue of type 'const TestType2' to rvalue reference type 'TestType2 &&'; types are not compatible}}
     // expected-error-re@any:* {{static_assert failed{{.*}} "ValueType is required to be a const lvalue reference or a CopyConstructible type"}}
     any_cast<TestType2 &&>(static_cast<any const&&>(a)); // expected-note {{requested here}}
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.fail.cpp b/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.fail.cpp
index e88deafce..97f1d9795 100644
--- a/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.fail.cpp
+++ b/test/std/utilities/any/any.nonmembers/any.cast/not_copy_constructible.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct no_move {
 // is triggered by these tests.
 // expected-error@not_copy_constructible.fail.cpp:* 0+ {{call to unavailable function 'any_cast': introduced in macOS 10.14}}
 
-int main() {
+int main(int, char**) {
     any a;
     // expected-error-re@any:* {{static_assert failed{{.*}} "ValueType is required to be an lvalue reference or a CopyConstructible type"}}
     // expected-error@any:* {{static_cast from 'no_copy' to 'no_copy' uses deleted function}}
@@ -59,4 +58,6 @@ int main() {
     // expected-error-re@any:* {{static_assert failed{{.*}} "ValueType is required to be an rvalue reference or a CopyConstructible type"}}
     // expected-error@any:* {{static_cast from 'typename remove_reference<no_move &>::type' (aka 'no_move') to 'no_move' uses deleted function}}
     any_cast<no_move>(static_cast<any &&>(a));
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/any.cast/reference_types.fail.cpp b/test/std/utilities/any/any.nonmembers/any.cast/reference_types.fail.cpp
index 204c5c0d6..1ce06e289 100644
--- a/test/std/utilities/any/any.nonmembers/any.cast/reference_types.fail.cpp
+++ b/test/std/utilities/any/any.nonmembers/any.cast/reference_types.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 using std::any;
 using std::any_cast;
 
-int main()
+int main(int, char**)
 {
     any a(1);
 
@@ -51,4 +50,6 @@ int main()
 
     // expected-error-re@any:* 1 {{static_assert failed{{.*}} "_ValueType may not be a reference."}}
     any_cast<int const &&>(&a2); // expected-note {{requested here}}
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/make_any.pass.cpp b/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
index dad2973fb..9c5dda206 100644
--- a/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
+++ b/test/std/utilities/any/any.nonmembers/make_any.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -132,7 +125,7 @@ void test_make_any_throws()
 
 #endif
 
-int main() {
+int main(int, char**) {
     test_make_any_type<small>();
     test_make_any_type<large>();
     test_make_any_type<small_throws_on_copy>();
@@ -145,4 +138,6 @@ int main() {
     test_make_any_throws<LargeThrows>();
 
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/any/any.nonmembers/swap.pass.cpp b/test/std/utilities/any/any.nonmembers/swap.pass.cpp
index a2a40d138..5461a4d0c 100644
--- a/test/std/utilities/any/any.nonmembers/swap.pass.cpp
+++ b/test/std/utilities/any/any.nonmembers/swap.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_any_cast && !libcpp-no-exceptions
 
 // <any>
 
@@ -29,7 +22,7 @@
 using std::any;
 using std::any_cast;
 
-int main()
+int main(int, char**)
 {
 
     { // test noexcept
@@ -45,4 +38,6 @@ int main()
         assert(any_cast<int>(a1) == 2);
         assert(any_cast<int>(a2) == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/charconv/charconv.from.chars/integral.bool.fail.cpp b/test/std/utilities/charconv/charconv.from.chars/integral.bool.fail.cpp
index d21b638d0..2e744cc81 100644
--- a/test/std/utilities/charconv/charconv.from.chars/integral.bool.fail.cpp
+++ b/test/std/utilities/charconv/charconv.from.chars/integral.bool.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include <charconv>
 
-int main()
+int main(int, char**)
 {
     using std::from_chars;
     char buf[] = "01001";
@@ -27,4 +26,6 @@ int main()
 
     from_chars(buf, buf + sizeof(buf), lv);      // expected-error {{call to deleted function}}
     from_chars(buf, buf + sizeof(buf), lv, 16);  // expected-error {{call to deleted function}}
+
+  return 0;
 }
diff --git a/test/std/utilities/charconv/charconv.from.chars/integral.pass.cpp b/test/std/utilities/charconv/charconv.from.chars/integral.pass.cpp
index 4dec67e87..d750cb4a8 100644
--- a/test/std/utilities/charconv/charconv.from.chars/integral.pass.cpp
+++ b/test/std/utilities/charconv/charconv.from.chars/integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -184,9 +183,10 @@ struct test_signed : roundtrip_test_base<T>
     }
 };
 
-int
-main()
+int main(int, char**)
 {
     run<test_basics>(integrals);
     run<test_signed>(all_signed);
+
+  return 0;
 }
diff --git a/test/std/utilities/charconv/charconv.to.chars/integral.bool.fail.cpp b/test/std/utilities/charconv/charconv.to.chars/integral.bool.fail.cpp
index e3d702a3a..5c947d122 100644
--- a/test/std/utilities/charconv/charconv.to.chars/integral.bool.fail.cpp
+++ b/test/std/utilities/charconv/charconv.to.chars/integral.bool.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include <charconv>
 
-int main()
+int main(int, char**)
 {
     using std::to_chars;
     char buf[10];
@@ -27,4 +26,6 @@ int main()
 
     to_chars(buf, buf + sizeof(buf), false);   // expected-error {{call to deleted function}}
     to_chars(buf, buf + sizeof(buf), lv, 16);  // expected-error {{call to deleted function}}
+
+  return 0;
 }
diff --git a/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp b/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
index ddf614e33..c034151de 100644
--- a/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
+++ b/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -82,9 +81,10 @@ struct test_signed : to_chars_test_base<T>
     }
 };
 
-int
-main()
+int main(int, char**)
 {
     run<test_basics>(integrals);
     run<test_signed>(all_signed);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/arithmetic.operations/divides.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/divides.pass.cpp
index 7419b70e0..1dbbd8533 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/divides.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/divides.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::divides<int> F;
     const F f = F();
@@ -38,4 +37,6 @@ int main()
     constexpr double bar = std::divides<> () (3.0, 2);
     static_assert ( bar == 1.5, "" ); // exact in binary
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/arithmetic.operations/minus.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/minus.pass.cpp
index 25df69d60..186695f7b 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/minus.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::minus<int> F;
     const F f = F();
@@ -38,4 +37,6 @@ int main()
     constexpr double bar = std::minus<> () (3.0, 2);
     static_assert ( bar == 1.0, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/arithmetic.operations/modulus.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/modulus.pass.cpp
index 6f39792e9..3679a2d32 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/modulus.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/modulus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::modulus<int> F;
     const F f = F();
@@ -38,4 +37,6 @@ int main()
     constexpr int bar = std::modulus<> () (3L, 2);
     static_assert ( bar == 1, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/arithmetic.operations/multiplies.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/multiplies.pass.cpp
index 2b3548269..a09e59c78 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/multiplies.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/multiplies.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::multiplies<int> F;
     const F f = F();
@@ -38,4 +37,6 @@ int main()
     constexpr double bar = std::multiplies<> () (3.0, 2);
     static_assert ( bar == 6.0, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/arithmetic.operations/negate.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/negate.pass.cpp
index 198894023..553bf83e2 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/negate.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/negate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::negate<int> F;
     const F f = F();
@@ -37,4 +36,6 @@ int main()
     constexpr double bar = std::negate<> () (3.0);
     static_assert ( bar == -3.0, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/arithmetic.operations/plus.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/plus.pass.cpp
index b56d3ef2b..b2614f430 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/plus.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::plus<int> F;
     const F f = F();
@@ -38,4 +37,6 @@ int main()
     constexpr double bar = std::plus<> () (3.0, 2);
     static_assert ( bar == 5.0, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
index fce826f42..154a0f887 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ public:
 };
 
 
-int main ()
+int main(int, char**)
 {
     static_assert ( !is_transparent<std::plus<int>>::value, "" );
     static_assert ( !is_transparent<std::plus<std::string>>::value, "" );
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/PR23141_invoke_not_constexpr.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/PR23141_invoke_not_constexpr.pass.cpp
index 943e16217..931778f54 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/PR23141_invoke_not_constexpr.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/PR23141_invoke_not_constexpr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,9 @@ struct Fun
   }
 };
 
-int main()
+int main(int, char**)
 {
     std::bind(Fun{}, std::placeholders::_1, 42)("hello");
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp
index a543fffed..7010b33f3 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -116,7 +115,7 @@ void do_test_r(Fn* func) {
     }
 }
 
-int main()
+int main(int, char**)
 {
     do_test<int>(return_value);
     do_test<int&>(return_lvalue);
@@ -130,4 +129,6 @@ int main()
     do_test_r<long>(return_rvalue);
     do_test_r<long>(return_const_rvalue);
 
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/copy.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/copy.pass.cpp
index a4d502bb8..8beeb3321 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/copy.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,11 +26,13 @@ float _pow(float a, float b)
     return std::pow(a, b);
 }
 
-int main()
+int main(int, char**)
 {
     std::function<float(float, float)> fnc = _pow;
     auto task = std::bind(fnc, 2.f, 4.f);
     auto task2(task);
     assert(task() == 16);
     assert(task2() == 16);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_function_object.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_function_object.pass.cpp
index a9a38b83c..b87918da1 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_function_object.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_function_object.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct BadUnaryFunction
     }
 };
 
-int main()
+int main(int, char**)
 {
     // Check that BadUnaryFunction::operator()(S const &) is not
     // instantiated when checking if BadUnaryFunction is a nested bind
@@ -48,4 +47,6 @@ int main()
     b(0);
     auto b2 = std::bind<long>(DummyUnaryFunction(), BadUnaryFunction());
     b2(0);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_int_0.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_int_0.pass.cpp
index 815096f6b..a77e1895d 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_int_0.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_int_0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct A_int_0
     int operator()() const {return 5;}
 };
 
-int main()
+int main(int, char**)
 {
     test(std::bind(f), 1);
     test(std::bind(&f), 1);
@@ -52,4 +51,6 @@ int main()
     test(std::bind<int>(&f), 1);
     test(std::bind<int>(A_int_0()), 4);
     test_const(std::bind<int>(A_int_0()), 5);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_lvalue.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_lvalue.pass.cpp
index dbbd184c7..9b81d3301 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_lvalue.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_lvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -281,10 +280,12 @@ test3()
     assert(b);
 }
 
-int main()
+int main(int, char**)
 {
     test_void_1();
     test_int_1();
     test_void_2();
     test3();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_rvalue.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_rvalue.pass.cpp
index a1137ee38..10d2ce017 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_rvalue.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -259,10 +258,12 @@ void test_nested()
     assert(std::bind(f_nested, std::bind(g_nested, _1))(3) == 31);
 }
 
-int main()
+int main(int, char**)
 {
     test_void_1();
     test_int_1();
     test_void_2();
     test_nested();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_void_0.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_void_0.pass.cpp
index 73f26e4b5..2c8e56f03 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_void_0.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/invoke_void_0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ struct A_int_0
     int operator()() const {count += 2; return 5;}
 };
 
-int main()
+int main(int, char**)
 {
     test(std::bind(f));
     test(std::bind(&f));
@@ -71,4 +70,6 @@ int main()
     test(std::bind<void>(&g));
     test(std::bind<void>(A_int_0()));
     test_const(std::bind<void>(A_int_0()));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/nested.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/nested.pass.cpp
index 5b660da61..0d5be3413 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/nested.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/nested.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,12 +41,13 @@ struct plus_one
   }
 };
 
-int
-main()
+int main(int, char**)
 {
     using std::placeholders::_1;
 
     auto g = std::bind(power(), 2, _1);
     assert(g(5) == 32);
     assert(std::bind(plus_one(), g)(5) == 33);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp
index 5d833e288..8314dbe1e 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,11 +27,13 @@ test(const T&)
 
 struct C {};
 
-int main()
+int main(int, char**)
 {
     test<true>(std::bind(C()));
     test<true>(std::bind(C(), std::placeholders::_2));
     test<true>(std::bind<int>(C()));
     test<false>(1);
     test<false>(std::placeholders::_2);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression_03.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression_03.pass.cpp
index 12a78dbc7..c1af159b2 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression_03.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_bind_expression_03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ void test() {
 
 struct C {};
 
-int main() {
+int main(int, char**) {
     test<int>();
     test<void>();
     test<C>();
@@ -36,4 +35,6 @@ int main() {
     test<int(*)()>();
     test<int (C::*)()>();
     test<decltype(std::placeholders::_2)>();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_placeholder.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_placeholder.pass.cpp
index 1d7c649df..d2ccf1faf 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_placeholder.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/is_placeholder.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ test(const T&)
 
 struct C {};
 
-int main()
+int main(int, char**)
 {
     test<1>(std::placeholders::_1);
     test<2>(std::placeholders::_2);
@@ -42,4 +41,6 @@ int main()
     test<0>(5.5);
     test<0>('a');
     test<0>(C());
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/func.bind.place/placeholders.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/func.bind.place/placeholders.pass.cpp
index 59709d0ed..b71aae818 100644
--- a/test/std/utilities/function.objects/bind/func.bind/func.bind.place/placeholders.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/func.bind.place/placeholders.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -81,7 +80,7 @@ void use_placeholders_to_prevent_unused_warning() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     use_placeholders_to_prevent_unused_warning();
     test(std::placeholders::_1);
@@ -94,4 +93,6 @@ int main()
     test(std::placeholders::_8);
     test(std::placeholders::_9);
     test(std::placeholders::_10);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/func.bind/nothing_to_do.pass.cpp b/test/std/utilities/function.objects/bind/func.bind/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/function.objects/bind/func.bind/nothing_to_do.pass.cpp
+++ b/test/std/utilities/function.objects/bind/func.bind/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bind/nothing_to_do.pass.cpp b/test/std/utilities/function.objects/bind/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/function.objects/bind/nothing_to_do.pass.cpp
+++ b/test/std/utilities/function.objects/bind/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bitwise.operations/bit_and.pass.cpp b/test/std/utilities/function.objects/bitwise.operations/bit_and.pass.cpp
index 12d968f42..aa5324621 100644
--- a/test/std/utilities/function.objects/bitwise.operations/bit_and.pass.cpp
+++ b/test/std/utilities/function.objects/bitwise.operations/bit_and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::bit_and<int> F;
     const F f = F();
@@ -58,4 +57,6 @@ int main()
     constexpr int bar = std::bit_and<> () (0x58D3L, 0xEA95);
     static_assert ( bar == 0x4891, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bitwise.operations/bit_not.pass.cpp b/test/std/utilities/function.objects/bitwise.operations/bit_not.pass.cpp
index d5788986d..8bfa48f3e 100644
--- a/test/std/utilities/function.objects/bitwise.operations/bit_not.pass.cpp
+++ b/test/std/utilities/function.objects/bitwise.operations/bit_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::bit_not<int> F;
     const F f = F();
@@ -43,4 +42,6 @@ int main()
 
     constexpr int bar = std::bit_not<> () (0xEA95) & 0xFFFF;
     static_assert ( bar == 0x156A, "" );
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bitwise.operations/bit_or.pass.cpp b/test/std/utilities/function.objects/bitwise.operations/bit_or.pass.cpp
index 90dd9bc09..8abcd63af 100644
--- a/test/std/utilities/function.objects/bitwise.operations/bit_or.pass.cpp
+++ b/test/std/utilities/function.objects/bitwise.operations/bit_or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::bit_or<int> F;
     const F f = F();
@@ -58,4 +57,6 @@ int main()
     constexpr int bar = std::bit_or<> () (0x58D3L, 0xEA95);
     static_assert ( bar == 0xFAD7, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bitwise.operations/bit_xor.pass.cpp b/test/std/utilities/function.objects/bitwise.operations/bit_xor.pass.cpp
index a5cbd17a0..070bd4c5f 100644
--- a/test/std/utilities/function.objects/bitwise.operations/bit_xor.pass.cpp
+++ b/test/std/utilities/function.objects/bitwise.operations/bit_xor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::bit_xor<int> F;
@@ -62,4 +61,6 @@ int main()
     static_assert ( bar == 0xB246, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp b/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
index bcd353eba..5ad0f233f 100644
--- a/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ public:
 };
 
 
-int main () {
+int main(int, char**) {
     static_assert ( !is_transparent<std::bit_and<int>>::value, "" );
     static_assert ( !is_transparent<std::bit_and<std::string>>::value, "" );
     static_assert (  is_transparent<std::bit_and<void>>::value, "" );
diff --git a/test/std/utilities/function.objects/comparisons/constexpr_init.pass.cpp b/test/std/utilities/function.objects/comparisons/constexpr_init.pass.cpp
index abb80d06d..a0c41432e 100644
--- a/test/std/utilities/function.objects/comparisons/constexpr_init.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/constexpr_init.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,6 +42,8 @@ static_assert(test_constexpr_context<int>(), "");
 static_assert(test_constexpr_context<void>(), "");
 
 
-int main() {
+int main(int, char**) {
+
 
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/comparisons/equal_to.pass.cpp b/test/std/utilities/function.objects/comparisons/equal_to.pass.cpp
index d4d99756f..beed574f8 100644
--- a/test/std/utilities/function.objects/comparisons/equal_to.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/equal_to.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::equal_to<int> F;
     const F f = F();
@@ -40,4 +39,6 @@ int main()
     constexpr bool bar = std::equal_to<> () (36.0, 36);
     static_assert ( bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/comparisons/greater.pass.cpp b/test/std/utilities/function.objects/comparisons/greater.pass.cpp
index 50bdcceee..35c05757c 100644
--- a/test/std/utilities/function.objects/comparisons/greater.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/greater.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "pointer_comparison_test_helper.hpp"
 
-int main()
+int main(int, char**)
 {
     typedef std::greater<int> F;
     const F f = F();
@@ -50,4 +49,6 @@ int main()
     constexpr bool bar = std::greater<> () (36.0, 36);
     static_assert ( !bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp b/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp
index 0aacb81e9..9a6d36c41 100644
--- a/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "pointer_comparison_test_helper.hpp"
 
-int main()
+int main(int, char**)
 {
     typedef std::greater_equal<int> F;
     const F f = F();
@@ -50,4 +49,6 @@ int main()
     constexpr bool bar = std::greater_equal<> () (36.0, 36);
     static_assert ( bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/comparisons/less.pass.cpp b/test/std/utilities/function.objects/comparisons/less.pass.cpp
index 191d58d6e..31a2f975b 100644
--- a/test/std/utilities/function.objects/comparisons/less.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/less.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "pointer_comparison_test_helper.hpp"
 
-int main()
+int main(int, char**)
 {
     typedef std::less<int> F;
     const F f = F();
@@ -49,4 +48,6 @@ int main()
     constexpr bool bar = std::less<> () (36.0, 36);
     static_assert ( !bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp b/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp
index a6aca5d19..31cbed171 100644
--- a/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "pointer_comparison_test_helper.hpp"
 
-int main()
+int main(int, char**)
 {
     typedef std::less_equal<int> F;
     const F f = F();
@@ -50,4 +49,6 @@ int main()
     constexpr bool bar = std::less_equal<> () (36.0, 36);
     static_assert ( bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/comparisons/not_equal_to.pass.cpp b/test/std/utilities/function.objects/comparisons/not_equal_to.pass.cpp
index 777c25d52..0e405de1b 100644
--- a/test/std/utilities/function.objects/comparisons/not_equal_to.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/not_equal_to.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::not_equal_to<int> F;
     const F f = F();
@@ -42,4 +41,6 @@ int main()
     constexpr bool bar = std::not_equal_to<> () (36.0, 36);
     static_assert ( !bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/comparisons/transparent.pass.cpp b/test/std/utilities/function.objects/comparisons/transparent.pass.cpp
index ebae262b2..4be81925b 100644
--- a/test/std/utilities/function.objects/comparisons/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ public:
 };
 
 
-int main ()
+int main(int, char**)
 {
     static_assert ( !is_transparent<std::less<int>>::value, "" );
     static_assert ( !is_transparent<std::less<std::string>>::value, "" );
diff --git a/test/std/utilities/function.objects/func.def/nothing_to_do.pass.cpp b/test/std/utilities/function.objects/func.def/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/function.objects/func.def/nothing_to_do.pass.cpp
+++ b/test/std/utilities/function.objects/func.def/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.invoke/invoke.pass.cpp b/test/std/utilities/function.objects/func.invoke/invoke.pass.cpp
index d1ae6b780..57350f16c 100644
--- a/test/std/utilities/function.objects/func.invoke/invoke.pass.cpp
+++ b/test/std/utilities/function.objects/func.invoke/invoke.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -341,9 +340,11 @@ void noexcept_test() {
     }
 }
 
-int main() {
+int main(int, char**) {
     bullet_one_two_tests();
     bullet_three_four_tests();
     bullet_five_tests();
     noexcept_test();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.invoke/invoke_feature_test_macro.pass.cpp b/test/std/utilities/function.objects/func.invoke/invoke_feature_test_macro.pass.cpp
index 9c3f24262..b0404659d 100644
--- a/test/std/utilities/function.objects/func.invoke/invoke_feature_test_macro.pass.cpp
+++ b/test/std/utilities/function.objects/func.invoke/invoke_feature_test_macro.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,8 +31,10 @@
 
 int foo(int) { return 42; }
 
-int main() {
+int main(int, char**) {
 #if defined(__cpp_lib_invoke)
   assert(std::invoke(foo, 101) == 42);
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.memfn/member_data.fail.cpp b/test/std/utilities/function.objects/func.memfn/member_data.fail.cpp
index 5e748c93b..130644fbd 100644
--- a/test/std/utilities/function.objects/func.memfn/member_data.fail.cpp
+++ b/test/std/utilities/function.objects/func.memfn/member_data.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,9 @@ test(F f)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test(std::mem_fn(&A::data_));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.memfn/member_data.pass.cpp b/test/std/utilities/function.objects/func.memfn/member_data.pass.cpp
index dff211c60..52581881a 100644
--- a/test/std/utilities/function.objects/func.memfn/member_data.pass.cpp
+++ b/test/std/utilities/function.objects/func.memfn/member_data.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,9 @@ test(F f)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test(std::mem_fn(&A::data_));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.memfn/member_function.pass.cpp b/test/std/utilities/function.objects/func.memfn/member_function.pass.cpp
index 465e001c3..a271c0670 100644
--- a/test/std/utilities/function.objects/func.memfn/member_function.pass.cpp
+++ b/test/std/utilities/function.objects/func.memfn/member_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ test2(F f)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test0(std::mem_fn(&A::test0));
     test1(std::mem_fn(&A::test1));
@@ -74,4 +73,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((noexcept(std::mem_fn(&A::test0))), ""); // LWG#2489
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.memfn/member_function_const.pass.cpp b/test/std/utilities/function.objects/func.memfn/member_function_const.pass.cpp
index be22443e9..dc93196cd 100644
--- a/test/std/utilities/function.objects/func.memfn/member_function_const.pass.cpp
+++ b/test/std/utilities/function.objects/func.memfn/member_function_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,9 +69,11 @@ test2(F f)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test0(std::mem_fn(&A::test0));
     test1(std::mem_fn(&A::test1));
     test2(std::mem_fn(&A::test2));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.memfn/member_function_const_volatile.pass.cpp b/test/std/utilities/function.objects/func.memfn/member_function_const_volatile.pass.cpp
index 329ac16a8..594e1de8a 100644
--- a/test/std/utilities/function.objects/func.memfn/member_function_const_volatile.pass.cpp
+++ b/test/std/utilities/function.objects/func.memfn/member_function_const_volatile.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,9 +69,11 @@ test2(F f)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test0(std::mem_fn(&A::test0));
     test1(std::mem_fn(&A::test1));
     test2(std::mem_fn(&A::test2));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.memfn/member_function_volatile.pass.cpp b/test/std/utilities/function.objects/func.memfn/member_function_volatile.pass.cpp
index 743ded994..04439387d 100644
--- a/test/std/utilities/function.objects/func.memfn/member_function_volatile.pass.cpp
+++ b/test/std/utilities/function.objects/func.memfn/member_function_volatile.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,9 +69,11 @@ test2(F f)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test0(std::mem_fn(&A::test0));
     test1(std::mem_fn(&A::test1));
     test2(std::mem_fn(&A::test2));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.not_fn/not_fn.pass.cpp b/test/std/utilities/function.objects/func.not_fn/not_fn.pass.cpp
index f33b41577..a1c778412 100644
--- a/test/std/utilities/function.objects/func.not_fn/not_fn.pass.cpp
+++ b/test/std/utilities/function.objects/func.not_fn/not_fn.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -603,7 +602,7 @@ void test_lwg2767() {
     }
 }
 
-int main()
+int main(int, char**)
 {
     constructor_tests();
     return_type_tests();
@@ -613,4 +612,6 @@ int main()
     call_operator_forwarding_test();
     call_operator_noexcept_test();
     test_lwg2767();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.require/INVOKE_tested_elsewhere.pass.cpp b/test/std/utilities/function.objects/func.require/INVOKE_tested_elsewhere.pass.cpp
index d61c3773e..00b7d53be 100644
--- a/test/std/utilities/function.objects/func.require/INVOKE_tested_elsewhere.pass.cpp
+++ b/test/std/utilities/function.objects/func.require/INVOKE_tested_elsewhere.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,4 +12,6 @@
 // since they require calling the implementation specific "__invoke" and
 // "__invoke_constexpr" functions.
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/utilities/function.objects/func.require/binary_function.pass.cpp b/test/std/utilities/function.objects/func.require/binary_function.pass.cpp
index 934631903..79a4855ea 100644
--- a/test/std/utilities/function.objects/func.require/binary_function.pass.cpp
+++ b/test/std/utilities/function.objects/func.require/binary_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <functional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     typedef std::binary_function<int, short, bool> bf;
     static_assert((std::is_same<bf::first_argument_type, int>::value), "");
     static_assert((std::is_same<bf::second_argument_type, short>::value), "");
     static_assert((std::is_same<bf::result_type, bool>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.require/unary_function.pass.cpp b/test/std/utilities/function.objects/func.require/unary_function.pass.cpp
index 40a9d480b..f68b4b37c 100644
--- a/test/std/utilities/function.objects/func.require/unary_function.pass.cpp
+++ b/test/std/utilities/function.objects/func.require/unary_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <functional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     typedef std::unary_function<int, bool> uf;
     static_assert((std::is_same<uf::argument_type, int>::value), "");
     static_assert((std::is_same<uf::result_type, bool>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bm/default.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bm/default.pass.cpp
index c328b4a4e..55cde8fe7 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bm/default.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bm/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -123,7 +122,9 @@ test2()
     do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp
index 2555cedb2..106b0d37f 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bm/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -119,7 +118,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp
index f7b8e4983..be4db4e5a 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bm/hash.pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -137,7 +136,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bm/pred.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bm/pred.pass.cpp
index 17121d280..3656caa87 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bm/pred.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bm/pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -128,7 +127,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bmh/default.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bmh/default.pass.cpp
index ec65a4b9b..0b345deed 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bmh/default.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bmh/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -123,7 +122,9 @@ test2()
     do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp
index dfa587dcc..4106c5d6a 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -118,7 +117,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp
index 083065ca8..757bcc757 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bmh/hash.pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -131,7 +130,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.bmh/pred.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.bmh/pred.pass.cpp
index 865dd89ce..3a20b8851 100644
--- a/test/std/utilities/function.objects/func.search/func.search.bmh/pred.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.bmh/pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -125,7 +124,9 @@ test2()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
     test2<random_access_iterator<const char*>, random_access_iterator<const char*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.default/default.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.default/default.pass.cpp
index e498cfd96..eaf5eeb82 100644
--- a/test/std/utilities/function.objects/func.search/func.search.default/default.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.default/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -83,7 +82,7 @@ test()
     do_search(Iter1(ij), Iter1(ij+sj), Iter2(ik), Iter2(ik+sk), Iter1(ij+6));
 }
 
-int main() {
+int main(int, char**) {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<forward_iterator<const int*>, random_access_iterator<const int*> >();
@@ -93,4 +92,6 @@ int main() {
     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/func.search.default/default.pred.pass.cpp b/test/std/utilities/function.objects/func.search/func.search.default/default.pred.pass.cpp
index 025565f8e..773336f66 100644
--- a/test/std/utilities/function.objects/func.search/func.search.default/default.pred.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/func.search.default/default.pred.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -90,7 +89,7 @@ test()
     do_search(Iter1(ih), Iter1(ih+sh), Iter2(ii), Iter2(ii+3), Iter1(ih+3),  sh*3);
 }
 
-int main() {
+int main(int, char**) {
     test<forward_iterator<const int*>, forward_iterator<const int*> >();
     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<forward_iterator<const int*>, random_access_iterator<const int*> >();
@@ -100,4 +99,6 @@ int main() {
     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.search/nothing_to_do.pass.cpp b/test/std/utilities/function.objects/func.search/nothing_to_do.pass.cpp
index 9a59227ab..779762e7e 100644
--- a/test/std/utilities/function.objects/func.search/nothing_to_do.pass.cpp
+++ b/test/std/utilities/function.objects/func.search/nothing_to_do.pass.cpp
@@ -1,13 +1,14 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/bad_function_call.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/bad_function_call.pass.cpp
index 357a3b48e..eb223b88e 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/bad_function_call.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/bad_function_call.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 #include <functional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::bad_function_call>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/func.wrap.badcall.const/bad_function_call_ctor.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/func.wrap.badcall.const/bad_function_call_ctor.pass.cpp
index f5ab94875..385919227 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/func.wrap.badcall.const/bad_function_call_ctor.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.badcall/func.wrap.badcall.const/bad_function_call_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,9 @@
 #include <functional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     std::bad_function_call ex;
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.fail.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.fail.cpp
index e156fa966..2a34eff92 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.fail.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 struct S : public std::function<void()> { using function::function; };
 
-int main() {
+int main(int, char**) {
    S f1( [](){} );
    S f2(std::allocator_arg, std::allocator<int>{}, f1);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.pass.cpp
index 7d3a5dec4..70f68d2f4 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 using Fn = std::function<void()>;
 struct S : public std::function<void()> { using function::function; };
 
-int main() {
+int main(int, char**) {
     S s( [](){} );
     S f1( s );
 #if TEST_STD_VER <= 14
     S f2(std::allocator_arg, std::allocator<int>{}, s);
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
index 1a9206e0e..ec25bdf78 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ int A::count = 0;
 int g(int) {return 0;}
 int h(int) {return 1;}
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -133,4 +132,6 @@ int main()
     }
     assert(A::count == 0);
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.cap/operator_bool.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.cap/operator_bool.pass.cpp
index 829763f79..ab5eef372 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.cap/operator_bool.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.cap/operator_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 int g(int) {return 0;}
 
-int main()
+int main(int, char**)
 {
     {
     std::function<int(int)> f;
@@ -26,4 +25,6 @@ int main()
     f = g;
     assert(f);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F.pass.cpp
index fd296a736..fe5d24806 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ struct LValueCallable {
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -112,4 +111,6 @@ int main()
         static_assert(!std::is_constructible<Fn, RValueCallable>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_assign.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_assign.pass.cpp
index e927ad42c..f70a2087c 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_assign.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ struct LValueCallable {
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -116,4 +115,6 @@ int main()
         static_assert(!std::is_assignable<Fn&, RValueCallable>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_incomplete.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_incomplete.pass.cpp
index 75e2ecac3..21c2f216e 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_incomplete.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_incomplete.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,6 +58,8 @@ void test_pr34298()
   }
 }
 
-int main() {
+int main(int, char**) {
   test_pr34298();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_nullptr.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_nullptr.pass.cpp
index 3affd984a..ebea3d0aa 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_nullptr.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_nullptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -240,8 +239,10 @@ void test_md() {
     test_imp<int MemData::*, int(MemData&)>();
 }
 
-int main() {
+int main(int, char**) {
     test_func();
     test_mf();
     test_md();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.fail.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.fail.cpp
index f455f0311..50a11fb81 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.fail.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::function<int(int)> f(std::allocator_arg, std::allocator<int>());
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.pass.cpp
index adc785635..3b37ce6ff 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,10 +20,12 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::function<int(int)> f(std::allocator_arg, bare_allocator<int>());
     assert(!f);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.fail.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.fail.cpp
index b23153465..c31c0a21f 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.fail.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,9 @@
 
 void foo(int) {}
 
-int main()
+int main(int, char**)
 {
     std::function<void(int)> f(std::allocator_arg, std::allocator<int>(), foo);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp
index 8a2a12e0f..6fa0d6fae 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_F.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -107,7 +106,7 @@ void test_for_alloc(Alloc& alloc) {
     test_MemFunClass<int(MemFunClass::*)(int, int) const, int(MemFunClass&, int, int)>(alloc);
 }
 
-int main()
+int main(int, char**)
 {
     {
         bare_allocator<DummyClass> bare_alloc;
@@ -127,4 +126,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.fail.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.fail.cpp
index 2e4633b11..621588f81 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.fail.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,9 +21,11 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::function<void(int)> F;
     F f1;
     F f2(std::allocator_arg, std::allocator<int>(), f1);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp
index 8b0e83128..583ca162e 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -112,7 +111,7 @@ void test_for_alloc(Alloc& alloc)
     test_MemFunClass<int(MemFunClass::*)(int, int) const, int(MemFunClass&, int, int)>(alloc);
 }
 
-int main()
+int main(int, char**)
 {
   {
     bare_allocator<DummyClass> alloc;
@@ -122,4 +121,6 @@ int main()
     non_default_test_allocator<DummyClass> alloc(42);
     test_for_alloc(alloc);
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.fail.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.fail.cpp
index cc4ecce75..52bc528fe 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.fail.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,9 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::function<int(int)> f(std::allocator_arg, std::allocator<int>(), nullptr);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.pass.cpp
index 943e17087..653057f6e 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_nullptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +20,10 @@
 
 #include "min_allocator.h"
 
-int main()
+int main(int, char**)
 {
     std::function<int(int)> f(std::allocator_arg, bare_allocator<int>(), nullptr);
     assert(!f);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.fail.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.fail.cpp
index cb9fb9afa..643cad8f0 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.fail.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,10 +50,12 @@ int A::count = 0;
 
 int g(int) { return 0; }
 
-int main()
+int main(int, char**)
 {
     {
         std::function<int(int)> f = A();
         std::function<int(int)> f2(std::allocator_arg, std::allocator<A>(), std::move(f));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp
index 3e5435da1..064046d0b 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ int A::count = 0;
 
 int g(int) { return 0; }
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -106,4 +105,6 @@ int main()
         assert(f2.target<Ptr>());
         assert(f.target<Ptr>()); // f is unchanged because the target is small
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp
index 1c2be02c6..d7b11ae1b 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ int g(int) { return 0; }
 int g2(int, int) { return 2; }
 int g3(int, int, int) { return 3; }
 
-int main() {
+int main(int, char**) {
   assert(globalMemCounter.checkOutstandingNewEq(0));
   {
     std::function<int(int)> f = A();
@@ -135,4 +134,6 @@ int main() {
     assert(f.target<int (*)(int)>() == 0);
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp
index e9b399a2e..dbbde5ce4 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ int A::count = 0;
 
 int g(int) {return 0;}
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -162,4 +161,6 @@ int main()
         LIBCPP_ASSERT(f.target<Ptr>()); // f is unchanged because the target is small
     }
 #endif  // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/default.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/default.pass.cpp
index 83d61b6b2..46c14ce36 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/default.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::function<int(int)> f;
     assert(!f);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp
index 0813c48f3..e15fbbaae 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct A
 std::function<void()> A::global;
 bool A::cancel = false;
 
-int main()
+int main(int, char**)
 {
   A::global = A();
   assert(A::global.target<A>());
@@ -43,4 +42,6 @@ int main()
   A::cancel = true;
   A::global = std::function<void()>(nullptr);
   assert(!A::global.target<A>());
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t.pass.cpp
index f0d6402d1..d58e191c4 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::function<int(int)> f(nullptr);
     assert(!f);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign.pass.cpp
index 9b2482fb9..ff81080ff 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ int A::count = 0;
 
 int g(int) {return 0;}
 
-int main()
+int main(int, char**)
 {
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
@@ -69,4 +68,6 @@ int main()
     assert(globalMemCounter.checkOutstandingNewEq(0));
     assert(f.target<int(*)(int)>() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp
index eeb181928..def86085d 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct A
 std::function<void()> A::global;
 bool A::cancel = false;
 
-int main()
+int main(int, char**)
 {
   A::global = A();
   assert(A::global.target<A>());
@@ -43,4 +42,6 @@ int main()
   A::cancel = true;
   A::global = nullptr;
   assert(!A::global.target<A>());
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.fail.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.fail.cpp
index 61eda7244..0f8e051d4 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.fail.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,9 @@ test_int_1()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_int_1();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.pass.cpp
index cc4315c14..fb67a3abf 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.inv/invoke.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -402,7 +401,7 @@ void test_int_2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_void_0();
     test_int_0();
@@ -410,4 +409,6 @@ int main()
     test_int_1();
     test_void_2();
     test_int_2();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/assign_F_alloc.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/assign_F_alloc.pass.cpp
index cb45b30a9..8ddd1cd2b 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/assign_F_alloc.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/assign_F_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ public:
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER <= 14
     {
@@ -61,4 +60,6 @@ int main()
     }
     assert(A::count == 0);
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/swap.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/swap.pass.cpp
index 214c3f7c5..93997a0b5 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/swap.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ int h(int) { return 1; }
 int g2(int, int) { return 2; }
 int g3(int, int, int) { return 3; }
 
-int main() {
+int main(int, char**) {
   assert(globalMemCounter.checkOutstandingNewEq(0));
   {
     std::function<int(int)> f1 = A(1);
@@ -190,4 +189,6 @@ int main() {
   }
   assert(globalMemCounter.checkOutstandingNewEq(0));
   assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.nullptr/operator_==.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.nullptr/operator_==.pass.cpp
index 5bca09687..698a461c8 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.nullptr/operator_==.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.nullptr/operator_==.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@
 
 int g(int) {return 0;}
 
-int main()
+int main(int, char**)
 {
     {
     std::function<int(int)> f;
@@ -38,4 +37,6 @@ int main()
     assert(f != nullptr);
     assert(nullptr != f);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target.pass.cpp
index 7a4678ad1..d5031ba06 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ int A::count = 0;
 
 int g(int) {return 0;}
 
-int main()
+int main(int, char**)
 {
     {
     std::function<int(int)> f = A();
@@ -90,4 +89,6 @@ int main()
     assert(f.target<int>() == nullptr);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target_type.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target_type.pass.cpp
index 7605e3bf6..d9c8fc48d 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target_type.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.targ/target_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ int A::count = 0;
 
 int g(int) {return 0;}
 
-int main()
+int main(int, char**)
 {
     {
     std::function<int(int)> f = A();
@@ -58,4 +57,6 @@ int main()
     std::function<int(int)> f;
     assert(f.target_type() == typeid(void));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/function_types.h b/test/std/utilities/function.objects/func.wrap/func.wrap.func/function_types.h
index f1526544b..470a3a0db 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/function_types.h
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/function_types.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/types.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/types.pass.cpp
index e48b8f986..8083ad83a 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/types.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -99,10 +98,12 @@ void test_other_function ()
     static_assert((!has_second_argument_type<F>::value), "" );
 }
 
-int main()
+int main(int, char**)
 {
     test_nullary_function<std::function<int()>, int>();
     test_unary_function  <std::function<double(int)>, double, int>();
     test_binary_function <std::function<double(int, char)>, double, int, char>();
     test_other_function  <std::function<double(int, char, double)>, double>();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/func.wrap/nothing_to_do.pass.cpp b/test/std/utilities/function.objects/func.wrap/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/function.objects/func.wrap/nothing_to_do.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/logical.operations/logical_and.pass.cpp b/test/std/utilities/function.objects/logical.operations/logical_and.pass.cpp
index ac94fa536..29767a58c 100644
--- a/test/std/utilities/function.objects/logical.operations/logical_and.pass.cpp
+++ b/test/std/utilities/function.objects/logical.operations/logical_and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::logical_and<int> F;
     const F f = F();
@@ -49,4 +48,6 @@ int main()
     constexpr bool bar = std::logical_and<> () (36.0, 36);
     static_assert ( bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/logical.operations/logical_not.pass.cpp b/test/std/utilities/function.objects/logical.operations/logical_not.pass.cpp
index 4f783dd0f..e93fd06fd 100644
--- a/test/std/utilities/function.objects/logical.operations/logical_not.pass.cpp
+++ b/test/std/utilities/function.objects/logical.operations/logical_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::logical_not<int> F;
     const F f = F();
@@ -39,4 +38,6 @@ int main()
     constexpr bool bar = std::logical_not<> () (36);
     static_assert ( !bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/logical.operations/logical_or.pass.cpp b/test/std/utilities/function.objects/logical.operations/logical_or.pass.cpp
index 3c450a05d..abe536572 100644
--- a/test/std/utilities/function.objects/logical.operations/logical_or.pass.cpp
+++ b/test/std/utilities/function.objects/logical.operations/logical_or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::logical_or<int> F;
     const F f = F();
@@ -48,4 +47,6 @@ int main()
     constexpr bool bar = std::logical_or<> () (36.0, 36);
     static_assert ( bar, "" );
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp b/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp
index d64c02f97..eb590b31a 100644
--- a/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ public:
 };
 
 
-int main ()
+int main(int, char**)
 {
     static_assert ( !is_transparent<std::logical_and<int>>::value, "" );
     static_assert ( !is_transparent<std::logical_and<std::string>>::value, "" );
diff --git a/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.fail.cpp b/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.fail.cpp
index c8247a195..713afc665 100644
--- a/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.fail.cpp
+++ b/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,9 @@ struct Predicate {
     bool operator()(first_argument_type, second_argument_type) const { return true; }
 };
 
-int main() {
+int main(int, char**) {
     std::binary_negate<Predicate> f((Predicate())); // expected-error{{'binary_negate<Predicate>' is deprecated}}
     (void)f;
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/negators/binary_negate.pass.cpp b/test/std/utilities/function.objects/negators/binary_negate.pass.cpp
index 53ff5b47a..41541c10f 100644
--- a/test/std/utilities/function.objects/negators/binary_negate.pass.cpp
+++ b/test/std/utilities/function.objects/negators/binary_negate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::binary_negate<std::logical_and<int> > F;
     const F f = F(std::logical_and<int>());
@@ -26,4 +25,6 @@ int main()
     assert( f(36, 0));
     assert( f(0, 36));
     assert( f(0, 0));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.fail.cpp b/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.fail.cpp
index 584d3ab06..407cbd4fc 100644
--- a/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.fail.cpp
+++ b/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,6 +27,8 @@ struct Predicate {
     bool operator()(argument_type) const { return true; }
 };
 
-int main() {
+int main(int, char**) {
     std::not1(Predicate()); // expected-error{{'not1<Predicate>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/negators/not1.pass.cpp b/test/std/utilities/function.objects/negators/not1.pass.cpp
index f6ac7a49d..07c160a97 100644
--- a/test/std/utilities/function.objects/negators/not1.pass.cpp
+++ b/test/std/utilities/function.objects/negators/not1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::logical_not<int> F;
     assert(std::not1(F())(36));
     assert(!std::not1(F())(0));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.fail.cpp b/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.fail.cpp
index 92e3be580..24178e0a0 100644
--- a/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.fail.cpp
+++ b/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,6 +28,8 @@ struct Predicate {
     bool operator()(first_argument_type, second_argument_type) const { return true; }
 };
 
-int main() {
+int main(int, char**) {
     std::not2(Predicate()); // expected-error{{'not2<Predicate>' is deprecated}}
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/negators/not2.pass.cpp b/test/std/utilities/function.objects/negators/not2.pass.cpp
index 7541753d5..d9f3c95fd 100644
--- a/test/std/utilities/function.objects/negators/not2.pass.cpp
+++ b/test/std/utilities/function.objects/negators/not2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,11 +13,13 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::logical_and<int> F;
     assert(!std::not2(F())(36, 36));
     assert( std::not2(F())(36, 0));
     assert( std::not2(F())(0, 36));
     assert( std::not2(F())(0, 0));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.fail.cpp b/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.fail.cpp
index b38a7d2f1..15a0a2778 100644
--- a/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.fail.cpp
+++ b/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,9 @@ struct Predicate {
     bool operator()(argument_type) const { return true; }
 };
 
-int main() {
+int main(int, char**) {
     std::unary_negate<Predicate> f((Predicate())); // expected-error{{'unary_negate<Predicate>' is deprecated}}
     (void)f;
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/negators/unary_negate.pass.cpp b/test/std/utilities/function.objects/negators/unary_negate.pass.cpp
index e2498a3b5..54fd54f39 100644
--- a/test/std/utilities/function.objects/negators/unary_negate.pass.cpp
+++ b/test/std/utilities/function.objects/negators/unary_negate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::unary_negate<std::logical_not<int> > F;
     const F f = F(std::logical_not<int>());
@@ -23,4 +22,6 @@ int main()
     static_assert((std::is_same<F::result_type, bool>::value), "" );
     assert(f(36));
     assert(!f(0));
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.access/conversion.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.access/conversion.pass.cpp
index fede2538a..c15989f00 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.access/conversion.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.access/conversion.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(T& t)
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
     void (*fp)() = f;
     test(fp);
@@ -42,4 +41,6 @@ int main()
     test(i);
     const int j = 0;
     test(j);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp
index ba3c71e48..3ef0cdda8 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.assign/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ test_function()
     assert(&r2.get() == &f);
 }
 
-int main()
+int main(int, char**)
 {
     void (*fp)() = f;
     test(fp);
@@ -54,4 +53,6 @@ int main()
     test(i);
     const int j = 0;
     test(j);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.const/copy_ctor.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.const/copy_ctor.pass.cpp
index d9f05b4e5..355047d98 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.const/copy_ctor.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.const/copy_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(T& t)
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
     void (*fp)() = f;
     test(fp);
@@ -42,4 +41,6 @@ int main()
     test(i);
     const int j = 0;
     test(j);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.fail.cpp b/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.fail.cpp
index a2316063c..f02a9974d 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.fail.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::reference_wrapper<const int> r(3);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp
index d0dabd264..a43d0fd25 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test(T& t)
 
 void f() {}
 
-int main()
+int main(int, char**)
 {
     void (*fp)() = f;
     test(fp);
@@ -41,4 +40,6 @@ int main()
     test(i);
     const int j = 0;
     test(j);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_1.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_1.pass.cpp
index f2ffd44e2..d4cb421f5 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_1.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int i = 0;
     std::reference_wrapper<const int> r = std::cref(i);
     assert(&r.get() == &i);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_2.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_2.pass.cpp
index 758752644..093b7e230 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_2.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref_2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const int i = 0;
     std::reference_wrapper<const int> r1 = std::cref(i);
     std::reference_wrapper<const int> r2 = std::cref(r1);
     assert(&r2.get() == &i);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.fail.cpp b/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.fail.cpp
index 0aad4986a..c07028d21 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.fail.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,9 @@ struct A {};
 
 const A source() {return A();}
 
-int main()
+int main(int, char**)
 {
     std::reference_wrapper<const A> r = std::ref(source());
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.pass.cpp
index 39aa4843a..f64d8ad8c 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <functional>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int i = 0;
     std::reference_wrapper<int> r = std::ref(i);
     assert(&r.get() == &i);
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_2.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_2.pass.cpp
index 4033e676f..4fdaf992c 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_2.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ bool is5 ( int i ) { return i == 5; }
 template <typename T>
 bool call_pred ( T pred ) { return pred(5); }
 
-int main()
+int main(int, char**)
 {
     {
     int i = 0;
@@ -40,4 +39,6 @@ int main()
     assert(call_pred(std::ref(cp)));
     assert(cp.count() == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.fail.cpp b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.fail.cpp
index 551562721..d54d5184c 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.fail.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,9 @@ test_int_1()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_int_1();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp
index a9edf00ee..fd3104133 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -320,10 +319,12 @@ testint_2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_void_1();
     test_int_1();
     test_void_2();
     testint_2();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_int_0.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_int_0.pass.cpp
index 61357a7fa..67cf51f33 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_int_0.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_int_0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,9 @@ struct A_void_1
     }
 };
 
-int main()
+int main(int, char**)
 {
     test_int_0();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_void_0.pass.cpp b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_void_0.pass.cpp
index 8d700508c..18e655313 100644
--- a/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_void_0.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/refwrap.invoke/invoke_void_0.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,9 @@ test_void_0()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_void_0();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/type.pass.cpp b/test/std/utilities/function.objects/refwrap/type.pass.cpp
index 68e406798..d17ab8100 100644
--- a/test/std/utilities/function.objects/refwrap/type.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 class C {};
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::reference_wrapper<C>::type,
                                                        C>::value), "");
@@ -34,4 +33,6 @@ int main()
                                                        int*(C::*)(double*)>::value), "");
     static_assert((std::is_same<std::reference_wrapper<int (C::*)(double*) const volatile>::type,
                                                        int (C::*)(double*) const volatile>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/type_properties.pass.cpp b/test/std/utilities/function.objects/refwrap/type_properties.pass.cpp
index 27d498ec8..17eef26f0 100644
--- a/test/std/utilities/function.objects/refwrap/type_properties.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/type_properties.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<int>();
     test<double>();
@@ -61,4 +60,6 @@ int main()
 #if TEST_STD_VER >= 11
     test<MoveOnly>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/unwrap_ref_decay.pass.cpp b/test/std/utilities/function.objects/refwrap/unwrap_ref_decay.pass.cpp
index a63dc5b15..198789839 100644
--- a/test/std/utilities/function.objects/refwrap/unwrap_ref_decay.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/unwrap_ref_decay.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ void check() {
 
 struct T { };
 
-int main() {
+int main(int, char**) {
   check<T,             T>();
   check<T&,            T>();
   check<T const,       T>();
@@ -55,4 +54,6 @@ int main() {
   check<std::reference_wrapper<T[3]>&,     T (&)[3]>();
   check<std::reference_wrapper<T ()>,      T (&)()>();
   check<std::reference_wrapper<T ()>&,     T (&)()>();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/unwrap_reference.pass.cpp b/test/std/utilities/function.objects/refwrap/unwrap_reference.pass.cpp
index 441ddf4bd..209d5e2a0 100644
--- a/test/std/utilities/function.objects/refwrap/unwrap_reference.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/unwrap_reference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void check() {
 
 struct T { };
 
-int main() {
+int main(int, char**) {
   check<T>();
   check<int>();
   check<float>();
@@ -48,4 +47,6 @@ int main() {
   check<T*>();
   check<int*>();
   check<float*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/refwrap/weak_result.pass.cpp b/test/std/utilities/function.objects/refwrap/weak_result.pass.cpp
index 7ce4c846e..5a6a41fdb 100644
--- a/test/std/utilities/function.objects/refwrap/weak_result.pass.cpp
+++ b/test/std/utilities/function.objects/refwrap/weak_result.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -69,7 +68,7 @@ public:
     static const bool value = sizeof(test<T>(0)) == 1;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::reference_wrapper<functor1>::result_type,
                                 char>::value), "");
@@ -94,4 +93,6 @@ int main()
     static_assert(has_result_type<std::reference_wrapper<functor3> >::value, "");
     static_assert(!has_result_type<std::reference_wrapper<functor4> >::value, "");
     static_assert(!has_result_type<std::reference_wrapper<C> >::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/unord.hash/enabled_hashes.pass.cpp b/test/std/utilities/function.objects/unord.hash/enabled_hashes.pass.cpp
index 775247fc8..8f6c3e14e 100644
--- a/test/std/utilities/function.objects/unord.hash/enabled_hashes.pass.cpp
+++ b/test/std/utilities/function.objects/unord.hash/enabled_hashes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,6 +17,8 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/unord.hash/enum.fail.cpp b/test/std/utilities/function.objects/unord.hash/enum.fail.cpp
index 9e44bfb77..2e36b4c55 100644
--- a/test/std/utilities/function.objects/unord.hash/enum.fail.cpp
+++ b/test/std/utilities/function.objects/unord.hash/enum.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,8 +16,10 @@
 
 struct X {};
 
-int main()
+int main(int, char**)
 {
     X x;
     size_t h = std::hash<X>{} ( x );
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/unord.hash/enum.pass.cpp b/test/std/utilities/function.objects/unord.hash/enum.pass.cpp
index a7ddd9a49..e172bc2f3 100644
--- a/test/std/utilities/function.objects/unord.hash/enum.pass.cpp
+++ b/test/std/utilities/function.objects/unord.hash/enum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<Cardinals>();
 
@@ -60,4 +59,6 @@ int main()
     test<EightBitColors>();
 
     test<Fruits>();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/unord.hash/floating.pass.cpp b/test/std/utilities/function.objects/unord.hash/floating.pass.cpp
index e67aa016c..31b1b2d07 100644
--- a/test/std/utilities/function.objects/unord.hash/floating.pass.cpp
+++ b/test/std/utilities/function.objects/unord.hash/floating.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,9 +64,11 @@ test()
     assert(pinf != ninf);
 }
 
-int main()
+int main(int, char**)
 {
     test<float>();
     test<double>();
     test<long double>();
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/unord.hash/integral.pass.cpp b/test/std/utilities/function.objects/unord.hash/integral.pass.cpp
index ce87f5918..dbd44a882 100644
--- a/test/std/utilities/function.objects/unord.hash/integral.pass.cpp
+++ b/test/std/utilities/function.objects/unord.hash/integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>();
     test<char>();
@@ -109,4 +108,6 @@ int main()
     test<__int128_t>();
     test<__uint128_t>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/unord.hash/non_enum.pass.cpp b/test/std/utilities/function.objects/unord.hash/non_enum.pass.cpp
index 7b427b9ac..c47f8fa76 100644
--- a/test/std/utilities/function.objects/unord.hash/non_enum.pass.cpp
+++ b/test/std/utilities/function.objects/unord.hash/non_enum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 struct X {};
 
-int main()
+int main(int, char**)
 {
     using H = std::hash<X>;
     static_assert(!std::is_default_constructible<H>::value, "");
@@ -35,4 +34,6 @@ int main()
     static_assert(!std::is_invocable<H, X&>::value, "");
     static_assert(!std::is_invocable<H, X const&>::value, "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp b/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp
index f1c56aed7..17dfdce2d 100644
--- a/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp
+++ b/test/std/utilities/function.objects/unord.hash/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,8 +52,10 @@ void test_nullptr()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<int*>();
     test_nullptr();
+
+  return 0;
 }
diff --git a/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp b/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
index 653fbc43d..90b09132d 100644
--- a/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
+++ b/test/std/utilities/intseq/intseq.general/integer_seq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ auto extract ( const AtContainer &t, const std::integer_sequence<T, I...> )
 -> decltype ( std::make_tuple ( std::get<I>(t)... ))
 {     return  std::make_tuple ( std::get<I>(t)... ); }
 
-int main()
+int main(int, char**)
 {
 //  Make a couple of sequences
     using int3    = std::make_integer_sequence<int, 3>;     // generates int:    0,1,2
@@ -77,4 +76,6 @@ int main()
     auto tsizemix = extract ( tup, sizemix ());
     static_assert ( std::tuple_size<decltype(tsizemix)>::value == sizemix::size (), "tsizemix size wrong");
     assert ( tsizemix == std::make_tuple ( 11, 11, 12, 13, 15 ));
+
+  return 0;
 }
diff --git a/test/std/utilities/intseq/intseq.intseq/integer_seq.fail.cpp b/test/std/utilities/intseq/intseq.intseq/integer_seq.fail.cpp
index ed899e7ca..248b346e3 100644
--- a/test/std/utilities/intseq/intseq.intseq/integer_seq.fail.cpp
+++ b/test/std/utilities/intseq/intseq.intseq/integer_seq.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER > 11
 
@@ -37,4 +36,6 @@ int main()
 X
 
 #endif  // TEST_STD_VER > 11
+
+  return 0;
 }
diff --git a/test/std/utilities/intseq/intseq.intseq/integer_seq.pass.cpp b/test/std/utilities/intseq/intseq.intseq/integer_seq.pass.cpp
index 841a23433..a8e14c9a9 100644
--- a/test/std/utilities/intseq/intseq.intseq/integer_seq.pass.cpp
+++ b/test/std/utilities/intseq/intseq.intseq/integer_seq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <cstddef>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
 //  Make a few of sequences
     using int3    = std::integer_sequence<int, 3, 2, 1>;
@@ -43,4 +42,6 @@ int main()
 
     static_assert ( std::is_same<bool0::value_type, bool>::value, "bool0 type wrong" );
     static_assert ( bool0::size() == 0, "bool0 size wrong" );
+
+  return 0;
 }
diff --git a/test/std/utilities/intseq/intseq.make/make_integer_seq.fail.cpp b/test/std/utilities/intseq/intseq.make/make_integer_seq.fail.cpp
index 192626935..ec2e8cc7c 100644
--- a/test/std/utilities/intseq/intseq.make/make_integer_seq.fail.cpp
+++ b/test/std/utilities/intseq/intseq.make/make_integer_seq.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
   typedef std::make_integer_sequence<int, -3> MakeSeqT;
 
@@ -34,4 +33,6 @@ int main()
 #else
     MakeSeqT i; // expected-error@utility:* {{static_assert failed "std::make_integer_sequence must have a non-negative sequence length"}}
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/intseq/intseq.make/make_integer_seq.pass.cpp b/test/std/utilities/intseq/intseq.make/make_integer_seq.pass.cpp
index 9bfc5f3d9..50b49dd72 100644
--- a/test/std/utilities/intseq/intseq.make/make_integer_seq.pass.cpp
+++ b/test/std/utilities/intseq/intseq.make/make_integer_seq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_same<std::make_integer_sequence<int, 0>, std::integer_sequence<int>>::value, "");
     static_assert(std::is_same<std::make_integer_sequence<int, 1>, std::integer_sequence<int, 0>>::value, "");
@@ -29,4 +28,6 @@ int main()
     static_assert(std::is_same<std::make_integer_sequence<unsigned long long, 1>, std::integer_sequence<unsigned long long, 0>>::value, "");
     static_assert(std::is_same<std::make_integer_sequence<unsigned long long, 2>, std::integer_sequence<unsigned long long, 0, 1>>::value, "");
     static_assert(std::is_same<std::make_integer_sequence<unsigned long long, 3>, std::integer_sequence<unsigned long long, 0, 1, 2>>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.fail.cpp b/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.fail.cpp
index c3efe72fe..3979b5ddc 100644
--- a/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.fail.cpp
+++ b/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.pass.cpp b/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.pass.cpp
index c75d20b11..e6b5a58c9 100644
--- a/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.pass.cpp
+++ b/test/std/utilities/intseq/intseq.make/make_integer_seq_fallback.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/intseq/nothing_to_do.pass.cpp b/test/std/utilities/intseq/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/intseq/nothing_to_do.pass.cpp
+++ b/test/std/utilities/intseq/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp b/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp
index 636998aa0..1a58726a8 100644
--- a/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp
+++ b/test/std/utilities/memory/allocator.tag/allocator_arg.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 
 void test(std::allocator_arg_t) {}
 
-int main()
+int main(int, char**)
 {
     test(std::allocator_arg);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.fail.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.fail.cpp
index 71201f0ef..47cfbb049 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.fail.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,9 +42,11 @@ struct A
     }
 };
 
-int main()
+int main(int, char**)
 {
     A<int> a;
     std::allocator_traits<A<int> >::allocate(a, 10);          // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
     std::allocator_traits<A<int> >::allocate(a, 10, nullptr); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.pass.cpp
index 292d68de9..0ac2f266e 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct A
     }
 };
 
-int main()
+int main(int, char**)
 {
   {
     A<int> a;
@@ -46,4 +45,6 @@ int main()
     Alloc a;
     assert(std::allocator_traits<Alloc >::allocate(a, 10) == reinterpret_cast<VT*>(static_cast<std::uintptr_t>(0xDEADBEEF)));
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp
index 90a9154e1..e95247163 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate_hint.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ struct B
 };
 
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
   {
@@ -78,4 +77,6 @@ int main()
     Alloc b;
     assert(std::allocator_traits<Alloc >::allocate(b, 11, nullptr) == reinterpret_cast<VT*>(static_cast<std::uintptr_t>(0xFEADBEEF)));
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp
index e4aceffdd..67a2e8f4a 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -82,7 +81,7 @@ struct A2
 
 int A2::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         A0::count = 0;
@@ -150,4 +149,6 @@ int main()
         assert(b_construct == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/deallocate.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/deallocate.pass.cpp
index ecb67adb5..c738416e0 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/deallocate.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/deallocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct A
     }
 };
 
-int main()
+int main(int, char**)
 {
   {
     A<int> a;
@@ -52,4 +51,6 @@ int main()
     std::allocator_traits<Alloc >::deallocate(a, reinterpret_cast<VT*>(static_cast<std::uintptr_t>(0xDEADBEEF)), 10);
     assert(called == 1);
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp
index 1a812876b..70890d851 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/destroy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ struct A0
 
 int A0::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         A0::count = 0;
@@ -73,7 +72,7 @@ int main()
       std::aligned_storage<sizeof(VT)>::type store;
       std::allocator_traits<Alloc>::destroy(a, (VT*)&store);
     }
-#if TEST_STD_VER >= 11
+#if defined(_LIBCPP_VERSION) || TEST_STD_VER >= 11
     {
         A0::count = 0;
         b_destroy = 0;
@@ -87,4 +86,6 @@ int main()
         assert(b_destroy == 1);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp
index 7a2d76c6d..b758c9add 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ struct B
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         B<int> b;
@@ -75,4 +74,6 @@ int main()
         static_assert(noexcept(std::allocator_traits<std::allocator<int>>::max_size(a)) == true, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.members/select_on_container_copy_construction.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.members/select_on_container_copy_construction.pass.cpp
index 8355db182..be837670d 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.members/select_on_container_copy_construction.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.members/select_on_container_copy_construction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ struct B
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
         A<int> a;
@@ -74,4 +73,6 @@ int main()
         assert(std::allocator_traits<B<int> >::select_on_container_copy_construction(b).id == 100);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_pointer.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_pointer.pass.cpp
index 10fbfe141..756958b58 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_pointer.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ private:
   typedef void const_pointer;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::const_pointer, Ptr<const char> >::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::const_pointer, const char*>::value), "");
@@ -64,4 +63,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<D<char> >::const_pointer, const char*>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_void_pointer.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_void_pointer.pass.cpp
index 8365d2261..4fcc2fb7c 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_void_pointer.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/const_void_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -58,7 +57,7 @@ private:
     typedef int const_void_pointer;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::const_void_pointer, Ptr<const void> >::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::const_void_pointer, const void*>::value), "");
@@ -66,4 +65,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<D<char> >::const_void_pointer, const void*>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/difference_type.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/difference_type.pass.cpp
index c72890947..35721f1cb 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/difference_type.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ struct pointer_traits<C<char>::pointer>
 
 }
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::difference_type, short>::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::difference_type, std::ptrdiff_t>::value), "");
@@ -75,4 +74,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<D<char> >::difference_type, std::ptrdiff_t>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/is_always_equal.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/is_always_equal.pass.cpp
index 7f7b155c3..42b0fbab1 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/is_always_equal.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/is_always_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct C
     int not_empty_;  // some random member variable
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::is_always_equal, std::true_type>::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::is_always_equal, std::true_type>::value), "");
@@ -49,4 +48,6 @@ int main()
     static_assert((std::is_same<std::allocator_traits<A<const char> >::is_always_equal, std::true_type>::value), "");
     static_assert((std::is_same<std::allocator_traits<B<const char> >::is_always_equal, std::true_type>::value), "");
     static_assert((std::is_same<std::allocator_traits<C<const char> >::is_always_equal, std::false_type>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/pointer.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/pointer.pass.cpp
index ff1ae2c05..58b306660 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/pointer.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,11 +43,13 @@ private:
     typedef void pointer;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::pointer, Ptr<char> >::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::pointer, char*>::value), "");
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<C<char> >::pointer, char*>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_copy_assignment.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_copy_assignment.pass.cpp
index 0112ab371..b049159e2 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_copy_assignment.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_copy_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,11 +43,13 @@ private:
     typedef std::true_type propagate_on_container_copy_assignment;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::propagate_on_container_copy_assignment, std::true_type>::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::propagate_on_container_copy_assignment, std::false_type>::value), "");
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<C<char> >::propagate_on_container_copy_assignment, std::false_type>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_move_assignment.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_move_assignment.pass.cpp
index 64de15c2c..602ba96d5 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_move_assignment.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_move_assignment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,11 +44,13 @@ private:
 };
 
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::propagate_on_container_move_assignment, std::true_type>::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::propagate_on_container_move_assignment, std::false_type>::value), "");
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<C<char> >::propagate_on_container_move_assignment, std::false_type>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_swap.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_swap.pass.cpp
index a62336fa6..5ae53015f 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_swap.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/propagate_on_container_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,11 +42,13 @@ private:
     typedef std::true_type propagate_on_container_swap;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::propagate_on_container_swap, std::true_type>::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::propagate_on_container_swap, std::false_type>::value), "");
  #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<C<char> >::propagate_on_container_swap, std::false_type>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/rebind_alloc.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/rebind_alloc.pass.cpp
index 8097a66fc..d0d8476a8 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/rebind_alloc.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/rebind_alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -81,7 +80,7 @@ struct G {
     };
 };
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<A<char> >::rebind_alloc<double>, ReboundA<double> >::value), "");
@@ -98,4 +97,6 @@ int main()
     static_assert((std::is_same<std::allocator_traits<D<int, char> >::rebind_alloc<double>::other, D<double, char> >::value), "");
     static_assert((std::is_same<std::allocator_traits<E<char> >::rebind_alloc<double>::other, E<double> >::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/size_type.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/size_type.pass.cpp
index 00ed50727..cd7467139 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/size_type.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/size_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ struct pointer_traits<C<char>::pointer>
 
 }
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::size_type, unsigned short>::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::size_type,
@@ -73,4 +72,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<D<char> >::size_type, unsigned short>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator.traits.types/void_pointer.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator.traits.types/void_pointer.pass.cpp
index 2c3623793..55954dc70 100644
--- a/test/std/utilities/memory/allocator.traits/allocator.traits.types/void_pointer.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator.traits.types/void_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ private:
     typedef void void_pointer;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::void_pointer, Ptr<void> >::value), "");
     static_assert((std::is_same<std::allocator_traits<B<char> >::void_pointer, void*>::value), "");
@@ -65,4 +64,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<D<char> >::void_pointer, void*>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/allocator_type.pass.cpp b/test/std/utilities/memory/allocator.traits/allocator_type.pass.cpp
index fe35ae487..840ad820e 100644
--- a/test/std/utilities/memory/allocator.traits/allocator_type.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/allocator_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@ struct A
     typedef T value_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::allocator_type, A<char> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/rebind_traits.pass.cpp b/test/std/utilities/memory/allocator.traits/rebind_traits.pass.cpp
index af4f5bc3f..01aac9445 100644
--- a/test/std/utilities/memory/allocator.traits/rebind_traits.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/rebind_traits.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ struct E
     template <class U> struct rebind {typedef ReboundA<U> otter;};
 };
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::allocator_traits<A<char> >::rebind_traits<double>, std::allocator_traits<ReboundA<double> > >::value), "");
@@ -78,4 +77,6 @@ int main()
     static_assert((std::is_same<std::allocator_traits<D<int, char> >::rebind_traits<double>::other, std::allocator_traits<D<double, char> > >::value), "");
     static_assert((std::is_same<std::allocator_traits<E<char> >::rebind_traits<double>::other, std::allocator_traits<E<double> > >::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.traits/value_type.pass.cpp b/test/std/utilities/memory/allocator.traits/value_type.pass.cpp
index d0c3d2c09..047d40d5c 100644
--- a/test/std/utilities/memory/allocator.traits/value_type.pass.cpp
+++ b/test/std/utilities/memory/allocator.traits/value_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,9 @@ struct A
     typedef T value_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator_traits<A<char> >::value_type, char>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.uses/allocator.uses.construction/tested_elsewhere.pass.cpp b/test/std/utilities/memory/allocator.uses/allocator.uses.construction/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/memory/allocator.uses/allocator.uses.construction/tested_elsewhere.pass.cpp
+++ b/test/std/utilities/memory/allocator.uses/allocator.uses.construction/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp b/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp
index 2831399c3..d9d4fc3d8 100644
--- a/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp
+++ b/test/std/utilities/memory/allocator.uses/allocator.uses.trait/uses_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<false, int, std::allocator<int> >();
     test<true, std::vector<int>, std::allocator<int> >();
@@ -72,4 +71,6 @@ int main()
 // #if TEST_STD_VER >= 11
 //     static_assert((!std::uses_allocator<E, int>::value), "");
 // #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/allocator.uses/nothing_to_do.pass.cpp b/test/std/utilities/memory/allocator.uses/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/memory/allocator.uses/nothing_to_do.pass.cpp
+++ b/test/std/utilities/memory/allocator.uses/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/c.malloc/nothing_to_do.pass.cpp b/test/std/utilities/memory/c.malloc/nothing_to_do.pass.cpp
index a71806330..7e6c67800 100644
--- a/test/std/utilities/memory/c.malloc/nothing_to_do.pass.cpp
+++ b/test/std/utilities/memory/c.malloc/nothing_to_do.pass.cpp
@@ -1,14 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // <cstdlib> and <cstring> are already tested elsewhere
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.ctor.pass.cpp b/test/std/utilities/memory/default.allocator/allocator.ctor.pass.cpp
index 0afab685f..57946be08 100644
--- a/test/std/utilities/memory/default.allocator/allocator.ctor.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::allocator<char> AC;
@@ -47,4 +46,6 @@ int main()
     (void) a3;
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.globals/eq.pass.cpp b/test/std/utilities/memory/default.allocator/allocator.globals/eq.pass.cpp
index 8ce49b90d..63412bce1 100644
--- a/test/std/utilities/memory/default.allocator/allocator.globals/eq.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.globals/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,10 +21,12 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::allocator<int> a1;
     std::allocator<int> a2;
     assert(a1 == a2);
     assert(!(a1 != a2));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.members/address.pass.cpp b/test/std/utilities/memory/default.allocator/allocator.members/address.pass.cpp
index 04534f24d..c4ff55d0e 100644
--- a/test/std/utilities/memory/default.allocator/allocator.members/address.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.members/address.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,8 +31,10 @@ struct A
     void operator&() const {}
 };
 
-int main()
+int main(int, char**)
 {
     test_address<int>();
     test_address<A>();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.members/allocate.fail.cpp b/test/std/utilities/memory/default.allocator/allocator.members/allocate.fail.cpp
index 490309edd..889804f3b 100644
--- a/test/std/utilities/memory/default.allocator/allocator.members/allocate.fail.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.members/allocate.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,9 +19,11 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::allocator<int> a;
     a.allocate(3);          // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
     a.allocate(3, nullptr); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp b/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
index b53175376..8392cbdb7 100644
--- a/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -100,7 +99,7 @@ void test_aligned() {
   }
 }
 
-int main() {
+int main(int, char**) {
     test_aligned<1>();
     test_aligned<2>();
     test_aligned<4>();
@@ -109,4 +108,6 @@ int main() {
     test_aligned<MaxAligned>();
     test_aligned<OverAligned>();
     test_aligned<OverAligned * 2>();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp b/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp
index 34cbb8dc5..685e02ef3 100644
--- a/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.members/allocate.size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,8 +39,10 @@ void test()
     test_max<T> ((size_t) -1);                     // way too large
 }
 
-int main()
+int main(int, char**)
 {
     test<double>();
     LIBCPP_ONLY(test<const double>());
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.members/construct.pass.cpp b/test/std/utilities/memory/default.allocator/allocator.members/construct.pass.cpp
index 9ba987440..96954e04b 100644
--- a/test/std/utilities/memory/default.allocator/allocator.members/construct.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.members/construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ public:
 };
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     {
     std::allocator<A> a;
@@ -140,4 +139,6 @@ int main()
     assert(move_only_constructed == 0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator.members/max_size.pass.cpp b/test/std/utilities/memory/default.allocator/allocator.members/max_size.pass.cpp
index 10109383b..c2094bc04 100644
--- a/test/std/utilities/memory/default.allocator/allocator.members/max_size.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator.members/max_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 
 int new_called = 0;
 
-int main()
+int main(int, char**)
 {
     const std::allocator<int> a;
     std::size_t M = a.max_size();
     assert(M > 0xFFFF && M <= (std::numeric_limits<std::size_t>::max() / sizeof(int)));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator_pointers.pass.cpp b/test/std/utilities/memory/default.allocator/allocator_pointers.pass.cpp
index e1612ae05..ad4319410 100644
--- a/test/std/utilities/memory/default.allocator/allocator_pointers.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator_pointers.pass.cpp
@@ -1,18 +1,16 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03
+
 #include <memory>
 #include <cassert>
 
-#include "test_macros.h"
-
-#if TEST_STD_VER >= 11
 // #include <memory>
 //
 // template <class Alloc>
@@ -109,7 +107,7 @@ void test_void_pointer()
 
 struct Foo { int x; };
 
-int main()
+int main(int, char**)
 {
     test_pointer<std::allocator<char>> ();
     test_pointer<std::allocator<int>> ();
@@ -118,7 +116,6 @@ int main()
     test_void_pointer<std::allocator<char>> ();
     test_void_pointer<std::allocator<int>> ();
     test_void_pointer<std::allocator<Foo>> ();
+
+  return 0;
 }
-#else
-int main() {}
-#endif
diff --git a/test/std/utilities/memory/default.allocator/allocator_types.pass.cpp b/test/std/utilities/memory/default.allocator/allocator_types.pass.cpp
index 7f25e5776..0bff67efb 100644
--- a/test/std/utilities/memory/default.allocator/allocator_types.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator<char>::size_type, std::size_t>::value), "");
     static_assert((std::is_same<std::allocator<char>::difference_type, std::ptrdiff_t>::value), "");
@@ -54,4 +53,6 @@ int main()
     a2 = a;
     std::allocator<int> a3 = a2;
     ((void)a3);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/default.allocator/allocator_void.pass.cpp b/test/std/utilities/memory/default.allocator/allocator_void.pass.cpp
index cc1dbebae..528902d21 100644
--- a/test/std/utilities/memory/default.allocator/allocator_void.pass.cpp
+++ b/test/std/utilities/memory/default.allocator/allocator_void.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <memory>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::allocator<void>::pointer, void*>::value), "");
     static_assert((std::is_same<std::allocator<void>::const_pointer, const void*>::value), "");
@@ -33,4 +32,6 @@ int main()
     std::allocator<void> a;
     std::allocator<void> a2 = a;
     a2 = a;
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.conversion/to_address.pass.cpp b/test/std/utilities/memory/pointer.conversion/to_address.pass.cpp
index 64a5c73af..7d55974dd 100644
--- a/test/std/utilities/memory/pointer.conversion/to_address.pass.cpp
+++ b/test/std/utilities/memory/pointer.conversion/to_address.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -100,7 +99,7 @@ struct pointer_traits<::P4>
 int n = 0;
 static_assert(std::to_address(&n) == &n);
 
-int main()
+int main(int, char**)
 {
     int i = 0;
     ASSERT_NOEXCEPT(std::to_address(&i));
@@ -117,4 +116,6 @@ int main()
     P4 p4(&i);
     ASSERT_NOEXCEPT(std::to_address(p4));
     assert(std::to_address(p4) == &i);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/difference_type.pass.cpp b/test/std/utilities/memory/pointer.traits/difference_type.pass.cpp
index 483c32561..3eaedab16 100644
--- a/test/std/utilities/memory/pointer.traits/difference_type.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 #include <memory>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::pointer_traits<double*>::difference_type, std::ptrdiff_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/element_type.pass.cpp b/test/std/utilities/memory/pointer.traits/element_type.pass.cpp
index 44694fcb0..505881dde 100644
--- a/test/std/utilities/memory/pointer.traits/element_type.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/element_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 #include <memory>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::pointer_traits<const short*>::element_type, const short>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/pointer.pass.cpp b/test/std/utilities/memory/pointer.traits/pointer.pass.cpp
index 66e90cfcb..110a993dc 100644
--- a/test/std/utilities/memory/pointer.traits/pointer.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct A
     typedef char difference_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::pointer_traits<A>::pointer, A>::value), "");
     static_assert((std::is_same<std::pointer_traits<int*>::pointer, int*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/pointer.traits.functions/pointer_to.pass.cpp b/test/std/utilities/memory/pointer.traits/pointer.traits.functions/pointer_to.pass.cpp
index 85b15ea5b..9e6a48930 100644
--- a/test/std/utilities/memory/pointer.traits/pointer.traits.functions/pointer_to.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/pointer.traits.functions/pointer_to.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ public:
         {return A(&et);}
 };
 
-int main()
+int main(int, char**)
 {
     {
         int i = 0;
@@ -46,4 +45,6 @@ int main()
     {
         (std::pointer_traits<A<void> >::element_type)0;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/pointer.traits.types/difference_type.pass.cpp b/test/std/utilities/memory/pointer.traits/pointer.traits.types/difference_type.pass.cpp
index 27b2d08b0..d4d763c69 100644
--- a/test/std/utilities/memory/pointer.traits/pointer.traits.types/difference_type.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/pointer.traits.types/difference_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ private:
   typedef int difference_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::pointer_traits<A>::difference_type, char>::value), "");
     static_assert((std::is_same<std::pointer_traits<B>::difference_type, std::ptrdiff_t>::value), "");
@@ -63,4 +62,6 @@ int main()
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::pointer_traits<F<int>>::difference_type, std::ptrdiff_t>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/pointer.traits.types/element_type.pass.cpp b/test/std/utilities/memory/pointer.traits/pointer.traits.types/element_type.pass.cpp
index 48399d535..c0efdeab0 100644
--- a/test/std/utilities/memory/pointer.traits/pointer.traits.types/element_type.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/pointer.traits.types/element_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ private:
   typedef int element_type;
 };
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::pointer_traits<A>::element_type, char>::value), "");
     static_assert((std::is_same<std::pointer_traits<B<int> >::element_type, char>::value), "");
@@ -65,4 +64,6 @@ int main()
     static_assert((std::is_same<std::pointer_traits<F<double>>::element_type, double>::value), "");
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/pointer.traits.types/rebind.pass.cpp b/test/std/utilities/memory/pointer.traits/pointer.traits.types/rebind.pass.cpp
index 74c124901..a79f33916 100644
--- a/test/std/utilities/memory/pointer.traits/pointer.traits.types/rebind.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/pointer.traits.types/rebind.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -82,7 +81,7 @@ struct G
 #endif
 
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::pointer_traits<A<int*> >::rebind<double*>, A<double*> >::value), "");
@@ -102,4 +101,6 @@ int main()
     static_assert((std::is_same<std::pointer_traits<D<char, int> >::rebind<double>::other, D1<double, int> >::value), "");
     static_assert((std::is_same<std::pointer_traits<E<char, int> >::rebind<double>::other, E<double, int> >::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/pointer_to.pass.cpp b/test/std/utilities/memory/pointer.traits/pointer_to.pass.cpp
index 756f89429..e9b858c7f 100644
--- a/test/std/utilities/memory/pointer.traits/pointer_to.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/pointer_to.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,9 +35,11 @@ bool check() {
     return true;
 }
 
-int main() {
+int main(int, char**) {
     check();
 #if TEST_STD_VER > 17
     static_assert(check(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/pointer.traits/rebind.pass.cpp b/test/std/utilities/memory/pointer.traits/rebind.pass.cpp
index 4caf4f650..f64213c9b 100644
--- a/test/std/utilities/memory/pointer.traits/rebind.pass.cpp
+++ b/test/std/utilities/memory/pointer.traits/rebind.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,11 +20,13 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<std::pointer_traits<int*>::rebind<double>, double*>::value), "");
 #else
     static_assert((std::is_same<std::pointer_traits<int*>::rebind<double>::other, double*>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/ptr.align/align.pass.cpp b/test/std/utilities/memory/ptr.align/align.pass.cpp
index d77d13c90..3d0216cce 100644
--- a/test/std/utilities/memory/ptr.align/align.pass.cpp
+++ b/test/std/utilities/memory/ptr.align/align.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const unsigned N = 20;
     char buf[N];
@@ -81,4 +80,6 @@ int main()
     assert(p == &buf[0]);
     assert(r == nullptr);
     assert(s == N);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/nothing_to_do.pass.cpp b/test/std/utilities/memory/specialized.algorithms/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/memory/specialized.algorithms/nothing_to_do.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.pass.cpp b/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.pass.cpp
index e07bec4d0..f6310c7bc 100644
--- a/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct nothing {
     }
 };
 
-int main()
+int main(int, char**)
 {
     {
     int i;
@@ -48,4 +47,6 @@ int main()
     };
     assert(std::addressof(n) == (void*)std::addressof(i));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.temp.fail.cpp b/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.temp.fail.cpp
index 3ff32df11..f7033014d 100644
--- a/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.temp.fail.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/specialized.addressof/addressof.temp.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER > 14
     const int *p = std::addressof<const int>(0);
 #else
 #error
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/specialized.addressof/constexpr_addressof.pass.cpp b/test/std/utilities/memory/specialized.algorithms/specialized.addressof/constexpr_addressof.pass.cpp
index 41f06c519..f14a0e7fc 100644
--- a/test/std/utilities/memory/specialized.algorithms/specialized.addressof/constexpr_addressof.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/specialized.addressof/constexpr_addressof.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,10 +32,12 @@ constexpr int i = 0;
 constexpr double d = 0.0;
 constexpr A a{};
 
-int main()
+int main(int, char**)
 {
     static_assert(std::addressof(i) == &i, "");
     static_assert(std::addressof(d) == &d, "");
     constexpr const A* ap = std::addressof(a);
     static_assert(&ap->n == &a.n, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp b/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp
index 2ad9d04e5..4dbc20aba 100644
--- a/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct Counted {
 };
 int Counted::count = 0;
 
-int main()
+int main(int, char**)
 {
     using It = forward_iterator<Counted*>;
     const int N = 5;
@@ -44,4 +43,6 @@ int main()
     assert(Counted::count == 4);
     std::destroy(It(p), It(p + 4));
     assert(Counted::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp b/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp
index 4e67b1ece..d505222b0 100644
--- a/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_at.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ struct DCounted : VCounted {
     friend void operator&(DCounted) = delete;
 };
 
-int main()
+int main(int, char**)
 {
     {
     void* mem1 = std::malloc(sizeof(Counted));
@@ -75,4 +74,6 @@ int main()
     std::free(mem1);
     std::free(mem2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp b/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp
index d1eaca558..0dcc8e5a6 100644
--- a/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct Counted {
 };
 int Counted::count = 0;
 
-int main()
+int main(int, char**)
 {
     using It = forward_iterator<Counted*>;
     const int N = 5;
@@ -46,4 +45,6 @@ int main()
     It it = std::destroy_n(It(p), 4);
     assert(it == It(p+4));
     assert(Counted::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct.pass.cpp
index 05e55e3d9..67dd6fbd2 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -104,9 +103,11 @@ void test_value_initialized()
     assert(pool[4] == -1);
 }
 
-int main()
+int main(int, char**)
 {
     test_counted();
     test_value_initialized();
     test_ctor_throws();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct_n.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct_n.pass.cpp
index e5b9eca43..1052355a4 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct_n.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/uninitialized_default_construct_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -108,9 +107,11 @@ void test_value_initialized()
 }
 
 
-int main()
+int main(int, char**)
 {
     test_counted();
     test_value_initialized();
     test_ctor_throws();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct.pass.cpp
index 8479ce123..5dfcd83fe 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -103,9 +102,11 @@ void test_value_initialized()
     assert(pool[4] == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test_counted();
     test_value_initialized();
     test_ctor_throws();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct_n.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct_n.pass.cpp
index 319df2296..e43102ba4 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct_n.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.value/uninitialized_value_construct_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -108,8 +107,10 @@ void test_value_initialized()
     assert(pool[4] == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test_counted();
     test_value_initialized();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy.pass.cpp
index 2f387a4ce..2618bd533 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ struct Nasty
 
 int Nasty::counter_ = 0;
 
-int main()
+int main(int, char**)
 {
     {
     const int N = 5;
@@ -86,4 +85,6 @@ int main()
         }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy_n.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy_n.pass.cpp
index af20cd220..1a237a792 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy_n.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ struct Nasty
 
 int Nasty::counter_ = 0;
 
-int main()
+int main(int, char**)
 {
     {
     const int N = 5;
@@ -85,4 +84,6 @@ int main()
         assert(  p[i].i_ == i);
     }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/uninitialized_fill_n.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/uninitialized_fill_n.pass.cpp
index 862e5be8e..4dfde4f6e 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/uninitialized_fill_n.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.fill.n/uninitialized_fill_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ struct Nasty
 
 int Nasty::counter_ = 0;
 
-int main()
+int main(int, char**)
 {
     {
     const int N = 5;
@@ -85,4 +84,6 @@ int main()
     }
 
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.fill/uninitialized_fill.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.fill/uninitialized_fill.pass.cpp
index 57438e9cb..1996ec6c6 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.fill/uninitialized_fill.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.fill/uninitialized_fill.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ struct Nasty
 
 int Nasty::counter_ = 0;
 
-int main()
+int main(int, char**)
 {
     {
     const int N = 5;
@@ -82,4 +81,6 @@ int main()
     for (int i = 0; i < N; ++i)
         assert(bp[i].i_ == 23);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move.pass.cpp
index d914129f2..e17f5734b 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -108,7 +107,9 @@ void test_counted()
     assert(Counted::count == 0);
 }
 
-int main() {
+int main(int, char**) {
     test_counted();
     test_ctor_throws();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move_n.pass.cpp b/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move_n.pass.cpp
index 4083bc367..ee364aaf5 100644
--- a/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move_n.pass.cpp
+++ b/test/std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move_n.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -110,8 +109,10 @@ void test_counted()
     assert(Counted::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     test_counted();
     test_ctor_throws();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/storage.iterator/raw_storage_iterator.base.pass.cpp b/test/std/utilities/memory/storage.iterator/raw_storage_iterator.base.pass.cpp
index eb66ed4ad..5355d09ac 100644
--- a/test/std/utilities/memory/storage.iterator/raw_storage_iterator.base.pass.cpp
+++ b/test/std/utilities/memory/storage.iterator/raw_storage_iterator.base.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ public:
     A* operator& () DELETE_FUNCTION;
 };
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 14
     typedef std::aligned_storage<3*sizeof(A), std::alignment_of<A>::value>::type
@@ -55,4 +54,6 @@ int main()
         assert(it.base() == ap + 1);  // next place to write
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp b/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp
index 4d9d698f7..2b9b33fd9 100644
--- a/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp
+++ b/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ public:
     A* operator& () DELETE_FUNCTION;
 };
 
-int main()
+int main(int, char**)
 {
     {
     typedef A S;
@@ -68,4 +67,6 @@ int main()
     assert(ap->get() == 1); // original value
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp b/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp
index 52aca8192..db71c69bf 100644
--- a/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp
+++ b/test/std/utilities/memory/temporary.buffer/overaligned.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,10 +25,12 @@ struct alignas(32) A {
     int field;
 };
 
-int main()
+int main(int, char**)
 {
     std::pair<A*, std::ptrdiff_t> ip = std::get_temporary_buffer<A>(5);
     assert(!(ip.first == nullptr) ^ (ip.second == 0));
     assert(reinterpret_cast<uintptr_t>(ip.first) % alignof(A) == 0);
     std::return_temporary_buffer(ip.first);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/temporary.buffer/temporary_buffer.pass.cpp b/test/std/utilities/memory/temporary.buffer/temporary_buffer.pass.cpp
index c1575bda2..32a58e5a6 100644
--- a/test/std/utilities/memory/temporary.buffer/temporary_buffer.pass.cpp
+++ b/test/std/utilities/memory/temporary.buffer/temporary_buffer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,10 +19,12 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::pair<int*, std::ptrdiff_t> ip = std::get_temporary_buffer<int>(5);
     assert(ip.first);
     assert(ip.second == 5);
     std::return_temporary_buffer(ip.first);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp b/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp
index 54c85e943..bc6846fe7 100644
--- a/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp
+++ b/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,9 +26,11 @@
 #include "min_allocator.h"
 #include "deleter_types.h"
 
-int main()
+int main(int, char**)
 {
     std::unique_ptr<int, PointerDeleter<int>> p;
     std::ostringstream os;
     os << p; // expected-error {{invalid operands to binary expression}}
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.pass.cpp b/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.pass.cpp
index 1166a01e8..b9b158a9d 100644
--- a/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.pass.cpp
+++ b/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,11 +21,13 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::unique_ptr<int> p(new int(3));
     std::ostringstream os;
     assert(os.str().empty());
     os << p;
     assert(!os.str().empty());
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.dynamic.safety/declare_no_pointers.pass.cpp b/test/std/utilities/memory/util.dynamic.safety/declare_no_pointers.pass.cpp
index bbf4be20f..a2b6cf22e 100644
--- a/test/std/utilities/memory/util.dynamic.safety/declare_no_pointers.pass.cpp
+++ b/test/std/utilities/memory/util.dynamic.safety/declare_no_pointers.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 
 #include <memory>
 
-int main()
+int main(int, char**)
 {
     char* p = new char[10];
     std::declare_no_pointers(p, 10);
     std::undeclare_no_pointers(p, 10);
     delete [] p;
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.dynamic.safety/declare_reachable.pass.cpp b/test/std/utilities/memory/util.dynamic.safety/declare_reachable.pass.cpp
index 3f0bcead9..c923089fa 100644
--- a/test/std/utilities/memory/util.dynamic.safety/declare_reachable.pass.cpp
+++ b/test/std/utilities/memory/util.dynamic.safety/declare_reachable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,10 +14,12 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     int* p = new int;
     std::declare_reachable(p);
     assert(std::undeclare_reachable(p) == p);
     delete p;
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.dynamic.safety/get_pointer_safety.pass.cpp b/test/std/utilities/memory/util.dynamic.safety/get_pointer_safety.pass.cpp
index df77be964..2fea98364 100644
--- a/test/std/utilities/memory/util.dynamic.safety/get_pointer_safety.pass.cpp
+++ b/test/std/utilities/memory/util.dynamic.safety/get_pointer_safety.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ void test_pr26961() {
   assert(d == std::get_pointer_safety());
 }
 
-int main()
+int main(int, char**)
 {
   {
     std::pointer_safety r = std::get_pointer_safety();
@@ -34,4 +33,6 @@ int main()
   {
     test_pr26961();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/nothing_to_do.pass.cpp b/test/std/utilities/memory/util.smartptr/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/memory/util.smartptr/nothing_to_do.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.enab/enable_shared_from_this.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.enab/enable_shared_from_this.pass.cpp
index 8bd8993e5..fe7567eeb 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.enab/enable_shared_from_this.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.enab/enable_shared_from_this.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct PrivateBase : private std::enable_shared_from_this<PrivateBase> {
 };
 
 
-int main()
+int main(int, char**)
 {
     {  // https://bugs.llvm.org/show_bug.cgi?id=18843
     std::shared_ptr<T const> t1(new T);
@@ -168,4 +167,6 @@ int main()
         assert(my_weak.lock().get() == ptr);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.hash/enabled_hash.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.hash/enabled_hash.pass.cpp
index e9237c534..440fa8ac4 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.hash/enabled_hash.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.hash/enabled_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,6 +17,8 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_shared_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_shared_ptr.pass.cpp
index 5fba1fc04..34717ad42 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_shared_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_shared_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 struct A {};
 #endif
 
-int main()
+int main(int, char**)
 {
   {
     int* ptr = new int;
@@ -41,4 +40,6 @@ int main()
     test_hash_enabled_for_type<std::shared_ptr<A>>();
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp
index 78b04d861..5cae6ca7d 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.hash/hash_unique_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ struct A {};
 
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
   {
     int* ptr = new int;
@@ -100,4 +99,6 @@ int main()
 #endif
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong.pass.cpp
index 4b56a8fb6..7737cfd4d 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p(new int(4));
@@ -52,4 +51,6 @@ int main()
         assert(*v == 4);
         assert(*w == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong_explicit.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong_explicit.pass.cpp
index 065a7e90a..9198ca68c 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong_explicit.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p(new int(4));
@@ -57,4 +56,6 @@ int main()
         assert(*v == 4);
         assert(*w == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak.pass.cpp
index 2351e9741..da52811c9 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p(new int(4));
@@ -52,4 +51,6 @@ int main()
         assert(*v == 4);
         assert(*w == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak_explicit.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak_explicit.pass.cpp
index e36c8a5a9..703bf008f 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak_explicit.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -31,7 +30,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p(new int(4));
@@ -57,4 +56,6 @@ int main()
         assert(*v == 4);
         assert(*w == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange.pass.cpp
index f1fe28cc1..b51a24aef 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p(new int(4));
@@ -38,4 +37,6 @@ int main()
         assert(*p == 3);
         assert(*r == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange_explicit.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange_explicit.pass.cpp
index 45cbc5099..b59b515a5 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange_explicit.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p(new int(4));
@@ -38,4 +37,6 @@ int main()
         assert(*p == 3);
         assert(*r == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_is_lock_free.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_is_lock_free.pass.cpp
index f72a0bb24..e8bb64dcc 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_is_lock_free.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_is_lock_free.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -24,10 +23,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<int> p(new int(3));
         assert(std::atomic_is_lock_free(&p) == false);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load.pass.cpp
index b51c6cf08..63416faf3 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,11 +28,13 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p(new int(3));
         std::shared_ptr<int> q = std::atomic_load(&p);
         assert(*q == *p);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load_explicit.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load_explicit.pass.cpp
index 9f3617a2c..0708f874b 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load_explicit.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,11 +28,13 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<int> p(new int(3));
         std::shared_ptr<int> q = std::atomic_load_explicit(&p, std::memory_order_relaxed);
         assert(*q == *p);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store.pass.cpp
index 5ae26809f..42d7099a9 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p;
@@ -37,4 +36,6 @@ int main()
         std::atomic_store(&p, r);
         assert(*p == *r);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store_explicit.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store_explicit.pass.cpp
index ecba90b71..7da4de3fa 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store_explicit.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -29,7 +28,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<int> p;
@@ -37,4 +36,6 @@ int main()
         std::atomic_store_explicit(&p, r, std::memory_order_seq_cst);
         assert(*p == *r);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/types.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/types.pass.cpp
index f44c05eb7..c3aedd5b1 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/types.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,10 +22,12 @@
 
 struct A;  // purposefully incomplete
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::shared_ptr<A>::element_type, A>::value), "");
 #if TEST_STD_VER > 14
     static_assert((std::is_same<std::shared_ptr<A>::weak_type, std::weak_ptr<A>>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.getdeleter/get_deleter.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.getdeleter/get_deleter.pass.cpp
index 05a199cce..209e3fe71 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.getdeleter/get_deleter.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.getdeleter/get_deleter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         {
@@ -64,4 +63,6 @@ int main()
         std::default_delete<A>* d = std::get_deleter<std::default_delete<A> >(p);
         assert(d == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/auto_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/auto_ptr_Y.pass.cpp
index 10d53c126..a154a121c 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/auto_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/auto_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::auto_ptr<A> pA(new A);
@@ -111,4 +110,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr.pass.cpp
index 5d27a8865..e362f4d8d 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<A> pA(new A);
@@ -118,4 +117,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y.pass.cpp
index abd3d378e..2b666315e 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<A> pA(new A);
@@ -118,4 +117,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y_rv.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y_rv.pass.cpp
index 20275de60..6787c33c2 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y_rv.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_Y_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<A> pA(new A);
@@ -120,4 +119,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_rv.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_rv.pass.cpp
index 4a85633a8..e921a0991 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_rv.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/shared_ptr_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<A> pA(new A);
@@ -120,4 +119,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp
index 30e0fce21..4abe371bc 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.assign/unique_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::unique_ptr<A> pA(new A);
@@ -110,4 +109,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/const_pointer_cast.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/const_pointer_cast.pass.cpp
index 7d771d03c..51e2949b6 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/const_pointer_cast.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/const_pointer_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<const A> pA(new A);
@@ -54,4 +53,6 @@ int main()
         assert(pB.get() == pA.get());
         assert(!pB.owner_before(pA) && !pA.owner_before(pB));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/dynamic_pointer_cast.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/dynamic_pointer_cast.pass.cpp
index 4f88a5c43..76009b96a 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/dynamic_pointer_cast.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/dynamic_pointer_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<B> pB(new A);
@@ -54,4 +53,6 @@ int main()
         assert(pA.get() == 0);
         assert(pA.use_count() == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/static_pointer_cast.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/static_pointer_cast.pass.cpp
index 98fa13801..9ea544fee 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/static_pointer_cast.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cast/static_pointer_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<A> pA(new A);
@@ -66,4 +65,6 @@ int main()
         assert(pB.get() == pA.get());
         assert(!pB.owner_before(pA) && !pA.owner_before(pB));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/cmp_nullptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/cmp_nullptr.pass.cpp
index f40cbc3d0..98b5bbf0d 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/cmp_nullptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/cmp_nullptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@
 
 void do_nothing(int*) {}
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p1(new int(1));
     assert(!(p1 == nullptr));
@@ -66,4 +65,6 @@ int main()
     assert(!(nullptr > p2));
     assert( (p2 >= nullptr));
     assert( (nullptr >= p2));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/eq.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/eq.pass.cpp
index c4cd1693f..e25ba6117 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/eq.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 void do_nothing(int*) {}
 
-int main()
+int main(int, char**)
 {
     int* ptr1(new int);
     int* ptr2(new int);
@@ -28,4 +27,6 @@ int main()
     const std::shared_ptr<int> p3(ptr2, do_nothing);
     assert(p1 != p2);
     assert(p2 == p3);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/lt.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/lt.pass.cpp
index 5a90a9a32..fdef32d51 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/lt.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.cmp/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 void do_nothing(int*) {}
 
-int main()
+int main(int, char**)
 {
     int* ptr1(new int);
     int* ptr2(new int);
@@ -27,4 +26,6 @@ int main()
     const std::shared_ptr<int> p3(ptr2, do_nothing);
     assert((p1 < p2) == (ptr1 < ptr2));
     assert(!(p2 < p3) && !(p3 < p2));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/auto_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/auto_ptr.pass.cpp
index 3ad3232a9..282ddd0e0 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/auto_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/auto_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::auto_ptr<A> ptr(new A);
@@ -95,4 +94,6 @@ int main()
     assert(A::count == 0);
     assert(globalMemCounter.checkOutstandingNewEq(0));
 #endif // !defined(TEST_HAS_NO_EXCEPTIONS) && !defined(DISABLE_NEW_COUNT)
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/default.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/default.pass.cpp
index 9af5d7ea8..247ca0fa9 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/default.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::shared_ptr<int> p;
     assert(p.use_count() == 0);
     assert(p.get() == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t.pass.cpp
index 3a9b3a9ca..f29dd1cf7 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::shared_ptr<int> p(nullptr);
     assert(p.use_count() == 0);
     assert(p.get() == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp
index bf2a30401..ee5861122 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
     std::shared_ptr<A> p(nullptr, test_deleter<A>(3));
@@ -44,4 +43,6 @@ int main()
     assert(A::count == 0);
     assert(test_deleter<A>::count == 0);
     assert(test_deleter<A>::dealloc_count == 1);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp
index aabc66a03..0881e8cf4 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
     std::shared_ptr<A> p(nullptr, test_deleter<A>(3), test_allocator<A>(5));
@@ -82,4 +81,6 @@ int main()
     assert(test_deleter<A>::count == 0);
     assert(test_deleter<A>::dealloc_count == 1);
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator_throw.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator_throw.pass.cpp
index 55e52f49c..4700df008 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator_throw.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_allocator_throw.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     try
     {
@@ -44,4 +43,6 @@ int main()
         assert(test_allocator<A>::count == 0);
         assert(test_allocator<A>::alloc_count == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_throw.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_throw.pass.cpp
index e82f0fdcc..7d2628d60 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_throw.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/nullptr_t_deleter_throw.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct A
 int A::count = 0;
 
 
-int main()
+int main(int, char**)
 {
     globalMemCounter.throw_after = 0;
     try
@@ -52,4 +51,6 @@ int main()
         assert(test_deleter<A>::count == 0);
         assert(test_deleter<A>::dealloc_count == 1);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp
index c9cffa1fe..b55d764a6 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
     A* ptr = new A;
@@ -43,4 +42,6 @@ int main()
     assert(p.get() == ptr);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
index c813f6f6f..fd9819382 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
     A* ptr = new A;
@@ -45,4 +44,6 @@ int main()
     assert(A::count == 0);
     assert(test_deleter<A>::count == 0);
     assert(test_deleter<A>::dealloc_count == 1);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
index 96a1779fe..0ec18a7ae 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct A
 int A::count = 0;
 
 
-int main()
+int main(int, char**)
 {
     {
     A* ptr = new A;
@@ -86,4 +85,6 @@ int main()
     assert(test_deleter<A>::count == 0);
     assert(test_deleter<A>::dealloc_count == 1);
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator_throw.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator_throw.pass.cpp
index 47d24c349..5f2984c7e 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator_throw.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_allocator_throw.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     A* ptr = new A;
     try
@@ -45,4 +44,6 @@ int main()
         assert(test_allocator<A>::count == 0);
         assert(test_allocator<A>::alloc_count == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_throw.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_throw.pass.cpp
index 13c2d435b..da12e42ca 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_throw.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_deleter_throw.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     A* ptr = new A;
     globalMemCounter.throw_after = 0;
@@ -51,4 +50,6 @@ int main()
         assert(test_deleter<A>::dealloc_count == 1);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_throw.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_throw.pass.cpp
index 182d5f4a4..15e776003 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_throw.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/pointer_throw.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct A
 int A::count = 0;
 
 
-int main()
+int main(int, char**)
 {
     A* ptr = new A;
     assert(A::count == 1);
@@ -49,4 +48,6 @@ int main()
         assert(A::count == 0);
     }
     assert(globalMemCounter.checkOutstandingNewEq(0));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr.pass.cpp
index e1dcdfc81..091782f02 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<A> pA(new A);
@@ -59,4 +58,6 @@ int main()
         assert(A::count == 0);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp
index 8b5ffdc14..01a74898f 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ struct C
 
 int C::count = 0;
 
-int main()
+int main(int, char**)
 {
     static_assert(( std::is_convertible<std::shared_ptr<A>, std::shared_ptr<B> >::value), "");
     static_assert((!std::is_convertible<std::shared_ptr<B>, std::shared_ptr<A> >::value), "");
@@ -94,4 +93,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp
index ea0720404..cc86d12df 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_Y_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ struct C
 
 int C::count = 0;
 
-int main()
+int main(int, char**)
 {
     static_assert(( std::is_convertible<std::shared_ptr<A>, std::shared_ptr<B> >::value), "");
     static_assert((!std::is_convertible<std::shared_ptr<B>, std::shared_ptr<A> >::value), "");
@@ -110,4 +109,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_pointer.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_pointer.pass.cpp
index fb5262f3b..83a9a9720 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_pointer.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<A> pA(new A);
@@ -58,4 +57,6 @@ int main()
     }
     assert(A::count == 0);
     assert(B::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_rv.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_rv.pass.cpp
index 257d3ce19..86797a047 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_rv.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/shared_ptr_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<A> pA(new A);
@@ -74,4 +73,6 @@ int main()
         assert(A::count == 0);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp
index 17289197d..6fd812fca 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/unique_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ void fn ( const std::shared_ptr<B> &) { assert (false); }
 template <typename T>
 void assert_deleter ( T * ) { assert(false); }
 
-int main()
+int main(int, char**)
 {
     {
         std::unique_ptr<A> ptr(new A);
@@ -98,4 +97,6 @@ int main()
         std::shared_ptr<int> p2(std::move(p)); // should not call deleter when going out of scope
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp
index 830aa5bbc..9174f39be 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.const/weak_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
@@ -82,4 +81,6 @@ int main()
     }
     assert(A::count == 0);
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp
index a430b5d79..06c2bba67 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ private:
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
     int i = 67;
@@ -83,4 +82,6 @@ int main()
     assert(p->get_char() == 'f');
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_cxx03.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_cxx03.pass.cpp
index 527bbce14..00f79cc19 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_cxx03.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_cxx03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -98,7 +97,7 @@ void test()
     assert(Three::count == 0);
 }
 
-int main()
+int main(int, char**)
 {
     {
     int i = 67;
@@ -115,4 +114,6 @@ int main()
 #if TEST_STD_VER >= 11
     test<min_allocator<void> >();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.pass.cpp
index 88e691952..aed060e57 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -74,7 +73,7 @@ void test_pointer_to_function() {
 void test_pointer_to_function() {}
 #endif // _LIBCPP_VERSION
 
-int main()
+int main(int, char**)
 {
     int nc = globalMemCounter.outstanding_new;
     {
@@ -108,4 +107,6 @@ int main()
     }
 #endif
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.private.fail.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.private.fail.cpp
index 7f304054b..e17d7424b 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.private.fail.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.private.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,9 @@ private:
    S () {};  // ctor is private
 };
 
-int main()
+int main(int, char**)
 {
     std::shared_ptr<S> p = std::make_shared<S>();
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.protected.fail.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.protected.fail.cpp
index 0eeeed4e8..d4d8fb630 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.protected.fail.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.protected.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,9 @@ protected:
    S () {};  // ctor is protected
 };
 
-int main()
+int main(int, char**)
 {
     std::shared_ptr<S> p = std::make_shared<S>();  // expected-error-re@memory:* {{static_assert failed{{.*}} "Can't construct object in make_shared"}}
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.volatile.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.volatile.pass.cpp
index 59cd3d248..aa038f747 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.volatile.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.volatile.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,9 +52,11 @@ void test(const T &t0)
 
 }
 
-int main()
+int main(int, char**)
 {
     test<bool>(true);
     test<int>(3);
     test<double>(5.0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.dest/tested_elsewhere.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.dest/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.dest/tested_elsewhere.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.dest/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.io/io.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.io/io.pass.cpp
index b627ac1cc..b09550a6e 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.io/io.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.io/io.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,11 +18,13 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::shared_ptr<int> p(new int(3));
     std::ostringstream os;
     assert(os.str().empty());
     os << p;
     assert(!os.str().empty());
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset.pass.cpp
index 7bffc0699..c9df00319 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<B> p(new B);
@@ -59,4 +58,6 @@ int main()
         assert(p.get() == 0);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp
index 85a64d0f1..c35824165 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<B> p(new B);
@@ -61,4 +60,6 @@ int main()
         assert(p.get() == ptr);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp
index c33133d79..e7d457fa1 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<B> p(new B);
@@ -76,4 +75,6 @@ int main()
     assert(A::count == 0);
     assert(test_deleter<A>::count == 0);
     assert(test_deleter<A>::dealloc_count == 2);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp
index 58262eb43..9e2bd1012 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_pointer_deleter_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<B> p(new B);
@@ -85,4 +84,6 @@ int main()
     assert(test_deleter<A>::dealloc_count == 2);
     assert(test_allocator<A>::count == 0);
     assert(test_allocator<A>::alloc_count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/swap.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/swap.pass.cpp
index 6d28a5043..a27949ebb 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/swap.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         A* ptr1 = new A;
@@ -101,4 +100,6 @@ int main()
         assert(A::count == 0);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/arrow.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/arrow.pass.cpp
index 002816875..77bf3a22e 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/arrow.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <utility>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<std::pair<int, int> > p(new std::pair<int, int>(3, 4));
     assert(p->first == 3);
@@ -26,4 +25,6 @@ int main()
     p->second = 6;
     assert(p->first == 5);
     assert(p->second == 6);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/dereference.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/dereference.pass.cpp
index 378cd0514..a6f75533a 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/dereference.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/dereference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,10 +15,12 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p(new int(32));
     assert(*p == 32);
     *p = 3;
     assert(*p == 3);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bool.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bool.pass.cpp
index 1b79d4970..247deb07b 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bool.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/op_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     const std::shared_ptr<int> p(new int(32));
@@ -26,4 +25,6 @@ int main()
     const std::shared_ptr<int> p;
     assert(!p);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_shared_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_shared_ptr.pass.cpp
index 9f6f1bc75..497a53b21 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_shared_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_shared_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p1(new int);
     const std::shared_ptr<int> p2 = p1;
@@ -27,4 +26,6 @@ int main()
     assert(p1.owner_before(p3) || p3.owner_before(p1));
     assert(p3.owner_before(p1) == p3.owner_before(p2));
     ASSERT_NOEXCEPT(p1.owner_before(p2));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_weak_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_weak_ptr.pass.cpp
index 560293bbe..07c7a0644 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_weak_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/owner_before_weak_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p1(new int);
     const std::shared_ptr<int> p2 = p1;
@@ -30,4 +29,6 @@ int main()
     assert(p1.owner_before(w3) || p3.owner_before(w1));
     assert(p3.owner_before(w1) == p3.owner_before(w2));
     ASSERT_NOEXCEPT(p1.owner_before(w2));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/unique.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/unique.pass.cpp
index 50ff692f9..dfad31385 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/unique.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.obs/unique.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p(new int(32));
     assert(p.unique());
@@ -25,4 +24,6 @@ int main()
     assert(!p.unique());
     }
     assert(p.unique());
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.spec/swap.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.spec/swap.pass.cpp
index b40e4705a..b0bfcae9a 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.spec/swap.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.spec/swap.pass.cpp
@@ -27,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         A* ptr1 = new A;
@@ -101,4 +101,6 @@ int main()
         assert(A::count == 0);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/types.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/types.pass.cpp
index 45748d7db..f5bdb876b 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/types.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 struct A;  // purposefully incomplete
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::weak_ptr<A>::element_type, A>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.ownerless/owner_less.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.ownerless/owner_less.pass.cpp
index b7ea8d4dc..b3cc13d72 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.ownerless/owner_less.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.ownerless/owner_less.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@
 
 struct X {};
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p1(new int);
     const std::shared_ptr<int> p2 = p1;
@@ -129,4 +128,6 @@ int main()
     assert(s.find(vp) == s.end());
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/shared_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/shared_ptr_Y.pass.cpp
index 6b32079c7..02f180d3d 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/shared_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/shared_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<A> pA(new A);
@@ -58,4 +57,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr.pass.cpp
index e5713f375..f41c391c4 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<A> ps(new A);
@@ -75,4 +74,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr_Y.pass.cpp
index 5a03d926f..33b2ddd42 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.assign/weak_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<A> ps(new A);
@@ -75,4 +74,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/default.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/default.pass.cpp
index 28358db6a..e5a70abe4 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/default.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,8 +17,10 @@
 
 struct A;
 
-int main()
+int main(int, char**)
 {
     std::weak_ptr<A> p;
     assert(p.use_count() == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/shared_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/shared_ptr_Y.pass.cpp
index d70adb940..45be55e66 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/shared_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/shared_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ struct C
 
 int C::count = 0;
 
-int main()
+int main(int, char**)
 {
     static_assert(( std::is_convertible<std::shared_ptr<A>, std::weak_ptr<B> >::value), "");
     static_assert((!std::is_convertible<std::weak_ptr<B>, std::shared_ptr<A> >::value), "");
@@ -92,4 +91,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr.pass.cpp
index 90f958e26..658b233c4 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ template <class T>
 void sink (std::weak_ptr<T> &&) {}
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         const std::shared_ptr<A> ps(new A);
@@ -113,4 +112,6 @@ int main()
     assert(B::count == 0);
     assert(A::count == 0);
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr_Y.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr_Y.pass.cpp
index 51a8fa5ae..4268fda3a 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr_Y.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/weak_ptr_Y.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ int C::count = 0;
 template <class T>
 std::weak_ptr<T> source (std::shared_ptr<T> p) { return std::weak_ptr<T>(p); }
 
-int main()
+int main(int, char**)
 {
     static_assert(( std::is_convertible<std::weak_ptr<A>, std::weak_ptr<B> >::value), "");
     static_assert((!std::is_convertible<std::weak_ptr<B>, std::weak_ptr<A> >::value), "");
@@ -105,4 +104,6 @@ int main()
     }
     assert(B::count == 0);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.dest/tested_elsewhere.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.dest/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.dest/tested_elsewhere.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.dest/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/reset.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/reset.pass.cpp
index fa496d4bd..eae249ca1 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/reset.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/reset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::shared_ptr<A> p1(new A);
@@ -38,4 +37,6 @@ int main()
         assert(p1.use_count() == 1);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/swap.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/swap.pass.cpp
index 4001efb73..76703d0dd 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/swap.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.mod/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         A* ptr1 = new A;
@@ -46,4 +45,6 @@ int main()
         }
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/expired.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/expired.pass.cpp
index d61ac51af..5fb2dd4f9 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/expired.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/expired.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::weak_ptr<A> wp;
@@ -43,4 +42,6 @@ int main()
         assert(wp.use_count() == 0);
         assert(wp.expired() == (wp.use_count() == 0));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/lock.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/lock.pass.cpp
index 956884b5c..50ff84318 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/lock.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/lock.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         std::weak_ptr<A> wp;
@@ -55,4 +54,6 @@ int main()
         assert(A::count == 0);
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/not_less_than.fail.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/not_less_than.fail.cpp
index ccffc2a66..2df6d6a0e 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/not_less_than.fail.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/not_less_than.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p1(new int);
     const std::shared_ptr<int> p2(new int);
@@ -24,4 +23,6 @@ int main()
     const std::weak_ptr<int> w2(p2);
 
     bool b = w1 < w2;
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_shared_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_shared_ptr.pass.cpp
index 23df0d8e6..4d26f5f2b 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_shared_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_shared_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p1(new int);
     const std::shared_ptr<int> p2 = p1;
@@ -30,4 +29,6 @@ int main()
     assert(w1.owner_before(p3) || w3.owner_before(p1));
     assert(w3.owner_before(p1) == w3.owner_before(p2));
     ASSERT_NOEXCEPT(w1.owner_before(p2));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_weak_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_weak_ptr.pass.cpp
index a38bf67c2..39993cd8f 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_weak_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.obs/owner_before_weak_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <cassert>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     const std::shared_ptr<int> p1(new int);
     const std::shared_ptr<int> p2 = p1;
@@ -30,4 +29,6 @@ int main()
     assert(w1.owner_before(w3) || w3.owner_before(w1));
     assert(w3.owner_before(w1) == w3.owner_before(w2));
     ASSERT_NOEXCEPT(w1.owner_before(w2));
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.spec/swap.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.spec/swap.pass.cpp
index e13d5aeaf..53bc3eb9c 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.spec/swap.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.spec/swap.pass.cpp
@@ -27,7 +27,7 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
         A* ptr1 = new A;
@@ -46,4 +46,6 @@ int main()
         }
     }
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/memory/util.smartptr/util.smartptr.weakptr/bad_weak_ptr.pass.cpp b/test/std/utilities/memory/util.smartptr/util.smartptr.weakptr/bad_weak_ptr.pass.cpp
index cb895cd2b..f3e26dee5 100644
--- a/test/std/utilities/memory/util.smartptr/util.smartptr.weakptr/bad_weak_ptr.pass.cpp
+++ b/test/std/utilities/memory/util.smartptr/util.smartptr.weakptr/bad_weak_ptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,11 +20,13 @@
 #include <cassert>
 #include <cstring>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_base_of<std::exception, std::bad_weak_ptr>::value), "");
     std::bad_weak_ptr e;
     std::bad_weak_ptr e2 = e;
     e2 = e;
     assert(std::strcmp(e.what(), "bad_weak_ptr") == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.help/bool_constant.pass.cpp b/test/std/utilities/meta/meta.help/bool_constant.pass.cpp
index dcacf379b..917f8b919 100644
--- a/test/std/utilities/meta/meta.help/bool_constant.pass.cpp
+++ b/test/std/utilities/meta/meta.help/bool_constant.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER > 14
     typedef std::bool_constant<true> _t;
@@ -31,4 +30,6 @@ int main()
     static_assert((std::is_same<_f::type, _f>::value), "");
     static_assert((_f() == false), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.help/integral_constant.pass.cpp b/test/std/utilities/meta/meta.help/integral_constant.pass.cpp
index bf8aa0453..f312acad6 100644
--- a/test/std/utilities/meta/meta.help/integral_constant.pass.cpp
+++ b/test/std/utilities/meta/meta.help/integral_constant.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::integral_constant<int, 5> _5;
     static_assert(_5::value == 5, "");
@@ -48,4 +47,6 @@ int main()
     std::true_type t1;
     std::true_type t2 = t1;
     assert(t2);
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.logical/conjunction.pass.cpp b/test/std/utilities/meta/meta.logical/conjunction.pass.cpp
index d8dd386e9..e37769576 100644
--- a/test/std/utilities/meta/meta.logical/conjunction.pass.cpp
+++ b/test/std/utilities/meta/meta.logical/conjunction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 struct True  { static constexpr bool value = true; };
 struct False { static constexpr bool value = false; };
 
-int main()
+int main(int, char**)
 {
     static_assert ( std::conjunction<>::value, "" );
     static_assert ( std::conjunction<std::true_type >::value, "" );
@@ -63,4 +62,6 @@ int main()
 
     static_assert ( std::conjunction_v<True >, "" );
     static_assert (!std::conjunction_v<False>, "" );
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.logical/disjunction.pass.cpp b/test/std/utilities/meta/meta.logical/disjunction.pass.cpp
index f5ba178d6..baaed6f03 100644
--- a/test/std/utilities/meta/meta.logical/disjunction.pass.cpp
+++ b/test/std/utilities/meta/meta.logical/disjunction.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 struct True  { static constexpr bool value = true; };
 struct False { static constexpr bool value = false; };
 
-int main()
+int main(int, char**)
 {
     static_assert (!std::disjunction<>::value, "" );
     static_assert ( std::disjunction<std::true_type >::value, "" );
@@ -63,4 +62,6 @@ int main()
 
     static_assert ( std::disjunction_v<True >, "" );
     static_assert (!std::disjunction_v<False>, "" );
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.logical/negation.pass.cpp b/test/std/utilities/meta/meta.logical/negation.pass.cpp
index 7b4eb27a7..88ca693d3 100644
--- a/test/std/utilities/meta/meta.logical/negation.pass.cpp
+++ b/test/std/utilities/meta/meta.logical/negation.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 struct True  { static constexpr bool value = true; };
 struct False { static constexpr bool value = false; };
 
-int main()
+int main(int, char**)
 {
     static_assert (!std::negation<std::true_type >::value, "" );
     static_assert ( std::negation<std::false_type>::value, "" );
@@ -36,4 +35,6 @@ int main()
 
     static_assert ( std::negation<std::negation<std::true_type >>::value, "" );
     static_assert (!std::negation<std::negation<std::false_type>>::value, "" );
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.rel/is_base_of.pass.cpp b/test/std/utilities/meta/meta.rel/is_base_of.pass.cpp
index 4b17a9f96..ec27581a4 100644
--- a/test/std/utilities/meta/meta.rel/is_base_of.pass.cpp
+++ b/test/std/utilities/meta/meta.rel/is_base_of.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ struct B1 : B {};
 struct B2 : B {};
 struct D : private B1, private B2 {};
 
-int main()
+int main(int, char**)
 {
     test_is_base_of<B, D>();
     test_is_base_of<B1, D>();
@@ -54,4 +53,6 @@ int main()
     test_is_not_base_of<B&, D&>();
     test_is_not_base_of<B[3], D[3]>();
     test_is_not_base_of<int, int>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.rel/is_convertible.pass.cpp b/test/std/utilities/meta/meta.rel/is_convertible.pass.cpp
index 20c9eca8e..b1722b0fc 100644
--- a/test/std/utilities/meta/meta.rel/is_convertible.pass.cpp
+++ b/test/std/utilities/meta/meta.rel/is_convertible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ class CannotInstantiate {
   enum { X = T::ThisExpressionWillBlowUp };
 };
 
-int main()
+int main(int, char**)
 {
     // void
     test_is_convertible<void,void> ();
@@ -260,4 +259,6 @@ int main()
     // Ensure that CannotInstantiate is not instantiated by is_convertible when it is not needed.
     // For example CannotInstantiate is instatiated as a part of ADL lookup for arguments of type CannotInstantiate*.
     static_assert((std::is_convertible<CannotInstantiate<int>*, CannotInstantiate<int>*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.rel/is_convertible_fallback.pass.cpp b/test/std/utilities/meta/meta.rel/is_convertible_fallback.pass.cpp
index 5a607f3b1..057d3b658 100644
--- a/test/std/utilities/meta/meta.rel/is_convertible_fallback.pass.cpp
+++ b/test/std/utilities/meta/meta.rel/is_convertible_fallback.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/meta/meta.rel/is_invocable.pass.cpp b/test/std/utilities/meta/meta.rel/is_invocable.pass.cpp
index 1b2a9286f..fa0c0c82e 100644
--- a/test/std/utilities/meta/meta.rel/is_invocable.pass.cpp
+++ b/test/std/utilities/meta/meta.rel/is_invocable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,13 @@
 // Most testing of is_invocable is done within the [meta.trans.other] result_of
 // tests.
 
+// Fn and all types in the template parameter pack ArgTypes shall be
+//  complete types, cv void, or arrays of unknown bound.
+
 #include <type_traits>
 #include <functional>
 #include <memory>
+#include <vector>
 
 #include "test_macros.h"
 
@@ -38,129 +41,205 @@ struct NotCallableWithInt {
   int operator()(Tag) { return 42; }
 };
 
-int main()
-{
+struct Sink {
+  template <class ...Args>
+  void operator()(Args&&...) const {}
+};
+
+int main(int, char**) {
+  using AbominableFunc = void(...) const;
+
+  //  Non-callable things
+  {
+    static_assert(!std::is_invocable<void>::value, "");
+    static_assert(!std::is_invocable<const void>::value, "");
+    static_assert(!std::is_invocable<volatile void>::value, "");
+    static_assert(!std::is_invocable<const volatile void>::value, "");
+    static_assert(!std::is_invocable<std::nullptr_t>::value, "");
+    static_assert(!std::is_invocable<int>::value, "");
+    static_assert(!std::is_invocable<double>::value, "");
+
+    static_assert(!std::is_invocable<int[]>::value, "");
+    static_assert(!std::is_invocable<int[3]>::value, "");
+
+    static_assert(!std::is_invocable<int*>::value, "");
+    static_assert(!std::is_invocable<const int*>::value, "");
+    static_assert(!std::is_invocable<int const*>::value, "");
+
+    static_assert(!std::is_invocable<int&>::value, "");
+    static_assert(!std::is_invocable<const int&>::value, "");
+    static_assert(!std::is_invocable<int&&>::value, "");
+
+    static_assert(!std::is_invocable<std::vector<int> >::value, "");
+    static_assert(!std::is_invocable<std::vector<int*> >::value, "");
+    static_assert(!std::is_invocable<std::vector<int**> >::value, "");
+
+    static_assert(!std::is_invocable<AbominableFunc>::value, "");
+
+    //  with parameters
+    static_assert(!std::is_invocable<int, int>::value, "");
+    static_assert(!std::is_invocable<int, double, float>::value, "");
+    static_assert(!std::is_invocable<int, char, float, double>::value, "");
+    static_assert(!std::is_invocable<Sink, AbominableFunc>::value, "");
+    static_assert(!std::is_invocable<Sink, void>::value, "");
+    static_assert(!std::is_invocable<Sink, const volatile void>::value,
+                  "");
+
+
+    static_assert(!std::is_invocable_r<int, void>::value, "");
+    static_assert(!std::is_invocable_r<int, const void>::value, "");
+    static_assert(!std::is_invocable_r<int, volatile void>::value, "");
+    static_assert(!std::is_invocable_r<int, const volatile void>::value, "");
+    static_assert(!std::is_invocable_r<int, std::nullptr_t>::value, "");
+    static_assert(!std::is_invocable_r<int, int>::value, "");
+    static_assert(!std::is_invocable_r<int, double>::value, "");
+
+    static_assert(!std::is_invocable_r<int, int[]>::value, "");
+    static_assert(!std::is_invocable_r<int, int[3]>::value, "");
+
+    static_assert(!std::is_invocable_r<int, int*>::value, "");
+    static_assert(!std::is_invocable_r<int, const int*>::value, "");
+    static_assert(!std::is_invocable_r<int, int const*>::value, "");
+
+    static_assert(!std::is_invocable_r<int, int&>::value, "");
+    static_assert(!std::is_invocable_r<int, const int&>::value, "");
+    static_assert(!std::is_invocable_r<int, int&&>::value, "");
+
+    static_assert(!std::is_invocable_r<int, std::vector<int> >::value, "");
+    static_assert(!std::is_invocable_r<int, std::vector<int*> >::value, "");
+    static_assert(!std::is_invocable_r<int, std::vector<int**> >::value, "");
+    static_assert(!std::is_invocable_r<void, AbominableFunc>::value, "");
+
+    //  with parameters
+    static_assert(!std::is_invocable_r<int, int, int>::value, "");
+    static_assert(!std::is_invocable_r<int, int, double, float>::value, "");
+    static_assert(!std::is_invocable_r<int, int, char, float, double>::value,
+                  "");
+    static_assert(!std::is_invocable_r<void, Sink, AbominableFunc>::value, "");
+    static_assert(!std::is_invocable_r<void, Sink, void>::value, "");
+    static_assert(!std::is_invocable_r<void, Sink, const volatile void>::value,
+                  "");
+  }
+  {
+    using Fn = int (Tag::*)(int);
+    using RFn = int (Tag::*)(int)&&;
+    // INVOKE bullet 1, 2 and 3
     {
-        using Fn = int(Tag::*)(int);
-        using RFn = int(Tag::*)(int) &&;
-        // INVOKE bullet 1, 2 and 3
-        {
-            // Bullet 1
-            static_assert(std::is_invocable<Fn, Tag&, int>::value, "");
-            static_assert(std::is_invocable<Fn, DerFromTag&, int>::value, "");
-            static_assert(std::is_invocable<RFn, Tag&&, int>::value, "");
-            static_assert(!std::is_invocable<RFn, Tag&, int>::value, "");
-            static_assert(!std::is_invocable<Fn, Tag&>::value, "");
-            static_assert(!std::is_invocable<Fn, Tag const&, int>::value, "");
-        }
-        {
-            // Bullet 2
-            using T = std::reference_wrapper<Tag>;
-            using DT = std::reference_wrapper<DerFromTag>;
-            using CT = std::reference_wrapper<const Tag>;
-            static_assert(std::is_invocable<Fn, T&, int>::value, "");
-            static_assert(std::is_invocable<Fn, DT&, int>::value, "");
-            static_assert(std::is_invocable<Fn, const T&, int>::value, "");
-            static_assert(std::is_invocable<Fn, T&&, int>::value, "");
-            static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
-            static_assert(!std::is_invocable<RFn, T, int>::value, "");
-        }
-        {
-            // Bullet 3
-            using T = Tag*;
-            using DT = DerFromTag*;
-            using CT = const Tag*;
-            using ST = std::unique_ptr<Tag>;
-            static_assert(std::is_invocable<Fn, T&, int>::value, "");
-            static_assert(std::is_invocable<Fn, DT&, int>::value, "");
-            static_assert(std::is_invocable<Fn, const T&, int>::value, "");
-            static_assert(std::is_invocable<Fn, T&&, int>::value, "");
-            static_assert(std::is_invocable<Fn, ST, int>::value, "");
-            static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
-            static_assert(!std::is_invocable<RFn, T, int>::value, "");
-        }
+      // Bullet 1
+      static_assert(std::is_invocable<Fn, Tag&, int>::value, "");
+      static_assert(std::is_invocable<Fn, DerFromTag&, int>::value, "");
+      static_assert(std::is_invocable<RFn, Tag&&, int>::value, "");
+      static_assert(!std::is_invocable<RFn, Tag&, int>::value, "");
+      static_assert(!std::is_invocable<Fn, Tag&>::value, "");
+      static_assert(!std::is_invocable<Fn, Tag const&, int>::value, "");
     }
     {
-        // Bullets 4, 5 and 6
-        using Fn = int (Tag::*);
-        static_assert(!std::is_invocable<Fn>::value, "");
-        {
-            // Bullet 4
-            static_assert(std::is_invocable<Fn, Tag&>::value, "");
-            static_assert(std::is_invocable<Fn, DerFromTag&>::value, "");
-            static_assert(std::is_invocable<Fn, Tag&&>::value, "");
-            static_assert(std::is_invocable<Fn, Tag const&>::value, "");
-        }
-        {
-            // Bullet 5
-            using T = std::reference_wrapper<Tag>;
-            using DT = std::reference_wrapper<DerFromTag>;
-            using CT = std::reference_wrapper<const Tag>;
-            static_assert(std::is_invocable<Fn, T&>::value, "");
-            static_assert(std::is_invocable<Fn, DT&>::value, "");
-            static_assert(std::is_invocable<Fn, const T&>::value, "");
-            static_assert(std::is_invocable<Fn, T&&>::value, "");
-            static_assert(std::is_invocable<Fn, CT&>::value, "");
-        }
-        {
-            // Bullet 6
-            using T = Tag*;
-            using DT = DerFromTag*;
-            using CT = const Tag*;
-            using ST = std::unique_ptr<Tag>;
-            static_assert(std::is_invocable<Fn, T&>::value, "");
-            static_assert(std::is_invocable<Fn, DT&>::value, "");
-            static_assert(std::is_invocable<Fn, const T&>::value, "");
-            static_assert(std::is_invocable<Fn, T&&>::value, "");
-            static_assert(std::is_invocable<Fn, ST>::value, "");
-            static_assert(std::is_invocable<Fn, CT&>::value, "");
-        }
+      // Bullet 2
+      using T = std::reference_wrapper<Tag>;
+      using DT = std::reference_wrapper<DerFromTag>;
+      using CT = std::reference_wrapper<const Tag>;
+      static_assert(std::is_invocable<Fn, T&, int>::value, "");
+      static_assert(std::is_invocable<Fn, DT&, int>::value, "");
+      static_assert(std::is_invocable<Fn, const T&, int>::value, "");
+      static_assert(std::is_invocable<Fn, T&&, int>::value, "");
+      static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
+      static_assert(!std::is_invocable<RFn, T, int>::value, "");
     }
     {
-        // INVOKE bullet 7
-        {
-            // Function pointer
-            using Fp = void(*)(Tag&, int);
-            static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
-            static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
-            static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
-            static_assert(!std::is_invocable<Fp>::value, "");
-            static_assert(!std::is_invocable<Fp, Tag&>::value, "");
-        }
-        {
-            // Function reference
-            using Fp = void(&)(Tag&, int);
-            static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
-            static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
-            static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
-            static_assert(!std::is_invocable<Fp>::value, "");
-            static_assert(!std::is_invocable<Fp, Tag&>::value, "");
-        }
-        {
-            // Function object
-            using Fn = NotCallableWithInt;
-            static_assert(std::is_invocable<Fn, Tag>::value, "");
-            static_assert(!std::is_invocable<Fn, int>::value, "");
-        }
+      // Bullet 3
+      using T = Tag*;
+      using DT = DerFromTag*;
+      using CT = const Tag*;
+      using ST = std::unique_ptr<Tag>;
+      static_assert(std::is_invocable<Fn, T&, int>::value, "");
+      static_assert(std::is_invocable<Fn, DT&, int>::value, "");
+      static_assert(std::is_invocable<Fn, const T&, int>::value, "");
+      static_assert(std::is_invocable<Fn, T&&, int>::value, "");
+      static_assert(std::is_invocable<Fn, ST, int>::value, "");
+      static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
+      static_assert(!std::is_invocable<RFn, T, int>::value, "");
     }
+  }
+  {
+    // Bullets 4, 5 and 6
+    using Fn = int(Tag::*);
+    static_assert(!std::is_invocable<Fn>::value, "");
     {
-        // Check that the conversion to the return type is properly checked
-        using Fn = int(*)();
-        static_assert(std::is_invocable_r<Implicit, Fn>::value, "");
-        static_assert(std::is_invocable_r<double, Fn>::value, "");
-        static_assert(std::is_invocable_r<const volatile void, Fn>::value, "");
-        static_assert(!std::is_invocable_r<Explicit, Fn>::value, "");
+      // Bullet 4
+      static_assert(std::is_invocable<Fn, Tag&>::value, "");
+      static_assert(std::is_invocable<Fn, DerFromTag&>::value, "");
+      static_assert(std::is_invocable<Fn, Tag&&>::value, "");
+      static_assert(std::is_invocable<Fn, Tag const&>::value, "");
     }
     {
-        // Check for is_invocable_v
-        using Fn = void(*)();
-        static_assert(std::is_invocable_v<Fn>, "");
-        static_assert(!std::is_invocable_v<Fn, int>, "");
+      // Bullet 5
+      using T = std::reference_wrapper<Tag>;
+      using DT = std::reference_wrapper<DerFromTag>;
+      using CT = std::reference_wrapper<const Tag>;
+      static_assert(std::is_invocable<Fn, T&>::value, "");
+      static_assert(std::is_invocable<Fn, DT&>::value, "");
+      static_assert(std::is_invocable<Fn, const T&>::value, "");
+      static_assert(std::is_invocable<Fn, T&&>::value, "");
+      static_assert(std::is_invocable<Fn, CT&>::value, "");
     }
     {
-        // Check for is_invocable_r_v
-        using Fn = void(*)();
-        static_assert(std::is_invocable_r_v<void, Fn>, "");
-        static_assert(!std::is_invocable_r_v<int, Fn>, "");
+      // Bullet 6
+      using T = Tag*;
+      using DT = DerFromTag*;
+      using CT = const Tag*;
+      using ST = std::unique_ptr<Tag>;
+      static_assert(std::is_invocable<Fn, T&>::value, "");
+      static_assert(std::is_invocable<Fn, DT&>::value, "");
+      static_assert(std::is_invocable<Fn, const T&>::value, "");
+      static_assert(std::is_invocable<Fn, T&&>::value, "");
+      static_assert(std::is_invocable<Fn, ST>::value, "");
+      static_assert(std::is_invocable<Fn, CT&>::value, "");
     }
+  }
+  { // INVOKE bullet 7
+   {// Function pointer
+    using Fp = void(*)(Tag&, int);
+  static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
+  static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
+  static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
+  static_assert(!std::is_invocable<Fp>::value, "");
+  static_assert(!std::is_invocable<Fp, Tag&>::value, "");
+}
+{
+  // Function reference
+  using Fp = void (&)(Tag&, int);
+  static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
+  static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
+  static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
+  static_assert(!std::is_invocable<Fp>::value, "");
+  static_assert(!std::is_invocable<Fp, Tag&>::value, "");
+}
+{
+  // Function object
+  using Fn = NotCallableWithInt;
+  static_assert(std::is_invocable<Fn, Tag>::value, "");
+  static_assert(!std::is_invocable<Fn, int>::value, "");
+}
+}
+{
+  // Check that the conversion to the return type is properly checked
+  using Fn = int (*)();
+  static_assert(std::is_invocable_r<Implicit, Fn>::value, "");
+  static_assert(std::is_invocable_r<double, Fn>::value, "");
+  static_assert(std::is_invocable_r<const volatile void, Fn>::value, "");
+  static_assert(!std::is_invocable_r<Explicit, Fn>::value, "");
+}
+{
+  // Check for is_invocable_v
+  using Fn = void (*)();
+  static_assert(std::is_invocable_v<Fn>, "");
+  static_assert(!std::is_invocable_v<Fn, int>, "");
+}
+{
+  // Check for is_invocable_r_v
+  using Fn = void (*)();
+  static_assert(std::is_invocable_r_v<void, Fn>, "");
+  static_assert(!std::is_invocable_r_v<int, Fn>, "");
+}
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.rel/is_nothrow_invocable.pass.cpp b/test/std/utilities/meta/meta.rel/is_nothrow_invocable.pass.cpp
index 3be3d46f2..baf64c12f 100644
--- a/test/std/utilities/meta/meta.rel/is_nothrow_invocable.pass.cpp
+++ b/test/std/utilities/meta/meta.rel/is_nothrow_invocable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,6 +14,7 @@
 
 #include <type_traits>
 #include <functional>
+#include <vector>
 
 #include "test_macros.h"
 
@@ -32,90 +32,186 @@ struct Explicit {
   explicit Explicit(int) noexcept {}
 };
 
-template <bool IsNoexcept, class Ret, class ...Args>
+template <bool IsNoexcept, class Ret, class... Args>
 struct CallObject {
   Ret operator()(Args&&...) const noexcept(IsNoexcept);
 };
 
-template <class Fn, class ...Args>
+struct Sink {
+  template <class... Args>
+  void operator()(Args&&...) const noexcept {}
+};
+
+template <class Fn, class... Args>
 constexpr bool throws_invocable() {
-    return std::is_invocable<Fn, Args...>::value &&
-        !std::is_nothrow_invocable<Fn, Args...>::value;
+  return std::is_invocable<Fn, Args...>::value &&
+         !std::is_nothrow_invocable<Fn, Args...>::value;
 }
 
-template <class Ret, class Fn, class ...Args>
+template <class Ret, class Fn, class... Args>
 constexpr bool throws_invocable_r() {
-    return std::is_invocable_r<Ret, Fn, Args...>::value &&
-        !std::is_nothrow_invocable_r<Ret, Fn, Args...>::value;
+  return std::is_invocable_r<Ret, Fn, Args...>::value &&
+         !std::is_nothrow_invocable_r<Ret, Fn, Args...>::value;
 }
 
 // FIXME(EricWF) Don't test the where noexcept is *not* part of the type system
 // once implementations have caught up.
-void test_noexcept_function_pointers()
-{
-    struct Dummy { void foo() noexcept {} static void bar() noexcept {} };
+void test_noexcept_function_pointers() {
+  struct Dummy {
+    void foo() noexcept {}
+    static void bar() noexcept {}
+  };
 #if !defined(__cpp_noexcept_function_type)
-    {
-        // Check that PMF's and function pointers *work*. is_nothrow_invocable will always
-        // return false because 'noexcept' is not part of the function type.
-        static_assert(throws_invocable<decltype(&Dummy::foo), Dummy&>(), "");
-        static_assert(throws_invocable<decltype(&Dummy::bar)>(), "");
-    }
+  {
+    // Check that PMF's and function pointers *work*. is_nothrow_invocable will always
+    // return false because 'noexcept' is not part of the function type.
+    static_assert(throws_invocable<decltype(&Dummy::foo), Dummy&>(), "");
+    static_assert(throws_invocable<decltype(&Dummy::bar)>(), "");
+  }
 #else
-    {
-        // Check that PMF's and function pointers actually work and that
-        // is_nothrow_invocable returns true for noexcept PMF's and function
-        // pointers.
-        static_assert(std::is_nothrow_invocable<decltype(&Dummy::foo), Dummy&>::value, "");
-        static_assert(std::is_nothrow_invocable<decltype(&Dummy::bar)>::value, "");
-    }
+  {
+    // Check that PMF's and function pointers actually work and that
+    // is_nothrow_invocable returns true for noexcept PMF's and function
+    // pointers.
+    static_assert(
+        std::is_nothrow_invocable<decltype(&Dummy::foo), Dummy&>::value, "");
+    static_assert(std::is_nothrow_invocable<decltype(&Dummy::bar)>::value, "");
+  }
 #endif
 }
 
-int main()
-{
-    {
-        // Check that the conversion to the return type is properly checked
-        using Fn = CallObject<true, int>;
-        static_assert(std::is_nothrow_invocable_r<Implicit, Fn>::value, "");
-        static_assert(std::is_nothrow_invocable_r<double, Fn>::value, "");
-        static_assert(std::is_nothrow_invocable_r<const volatile void, Fn>::value, "");
-        static_assert(throws_invocable_r<ThrowsImplicit, Fn>(), "");
-        static_assert(!std::is_nothrow_invocable<Fn(), Explicit>(), "");
-    }
-    {
-        // Check that the conversion to the parameters is properly checked
-        using Fn = CallObject<true, void, const Implicit&, const ThrowsImplicit&>;
-        static_assert(std::is_nothrow_invocable<Fn, Implicit&, ThrowsImplicit&>::value, "");
-        static_assert(std::is_nothrow_invocable<Fn, int, ThrowsImplicit&>::value, "");
-        static_assert(throws_invocable<Fn, int, int>(), "");
-        static_assert(!std::is_nothrow_invocable<Fn>::value, "");
-    }
-    {
-        // Check that the noexcept-ness of function objects is checked.
-        using Fn = CallObject<true, void>;
-        using Fn2 = CallObject<false, void>;
-        static_assert(std::is_nothrow_invocable<Fn>::value, "");
-        static_assert(throws_invocable<Fn2>(), "");
-    }
-    {
-        // Check that PMD derefs are noexcept
-        using Fn = int (Tag::*);
-        static_assert(std::is_nothrow_invocable<Fn, Tag&>::value, "");
-        static_assert(std::is_nothrow_invocable_r<Implicit, Fn, Tag&>::value, "");
-        static_assert(throws_invocable_r<ThrowsImplicit, Fn, Tag&>(), "");
-    }
-    {
-        // Check for is_nothrow_invocable_v
-        using Fn = CallObject<true, int>;
-        static_assert(std::is_nothrow_invocable_v<Fn>, "");
-        static_assert(!std::is_nothrow_invocable_v<Fn, int>, "");
-    }
-    {
-        // Check for is_nothrow_invocable_r_v
-        using Fn = CallObject<true, int>;
-        static_assert(std::is_nothrow_invocable_r_v<void, Fn>, "");
-        static_assert(!std::is_nothrow_invocable_r_v<int, Fn, int>, "");
-    }
-    test_noexcept_function_pointers();
+int main(int, char**) {
+  using AbominableFunc = void(...) const noexcept;
+  //  Non-callable things
+  {
+    static_assert(!std::is_nothrow_invocable<void>::value, "");
+    static_assert(!std::is_nothrow_invocable<const void>::value, "");
+    static_assert(!std::is_nothrow_invocable<volatile void>::value, "");
+    static_assert(!std::is_nothrow_invocable<const volatile void>::value, "");
+    static_assert(!std::is_nothrow_invocable<std::nullptr_t>::value, "");
+    static_assert(!std::is_nothrow_invocable<int>::value, "");
+    static_assert(!std::is_nothrow_invocable<double>::value, "");
+
+    static_assert(!std::is_nothrow_invocable<int[]>::value, "");
+    static_assert(!std::is_nothrow_invocable<int[3]>::value, "");
+
+    static_assert(!std::is_nothrow_invocable<int*>::value, "");
+    static_assert(!std::is_nothrow_invocable<const int*>::value, "");
+    static_assert(!std::is_nothrow_invocable<int const*>::value, "");
+
+    static_assert(!std::is_nothrow_invocable<int&>::value, "");
+    static_assert(!std::is_nothrow_invocable<const int&>::value, "");
+    static_assert(!std::is_nothrow_invocable<int&&>::value, "");
+
+    static_assert(!std::is_nothrow_invocable<int, std::vector<int> >::value,
+                  "");
+    static_assert(!std::is_nothrow_invocable<int, std::vector<int*> >::value,
+                  "");
+    static_assert(!std::is_nothrow_invocable<int, std::vector<int**> >::value,
+                  "");
+
+    static_assert(!std::is_nothrow_invocable<AbominableFunc>::value, "");
+
+    //  with parameters
+    static_assert(!std::is_nothrow_invocable<int, int>::value, "");
+    static_assert(!std::is_nothrow_invocable<int, double, float>::value, "");
+    static_assert(!std::is_nothrow_invocable<int, char, float, double>::value,
+                  "");
+    static_assert(!std::is_nothrow_invocable<Sink, AbominableFunc>::value, "");
+    static_assert(!std::is_nothrow_invocable<Sink, void>::value, "");
+    static_assert(!std::is_nothrow_invocable<Sink, const volatile void>::value,
+                  "");
+
+    static_assert(!std::is_nothrow_invocable_r<int, void>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, const void>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, volatile void>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, const volatile void>::value,
+                  "");
+    static_assert(!std::is_nothrow_invocable_r<int, std::nullptr_t>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, int>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, double>::value, "");
+
+    static_assert(!std::is_nothrow_invocable_r<int, int[]>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, int[3]>::value, "");
+
+    static_assert(!std::is_nothrow_invocable_r<int, int*>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, const int*>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, int const*>::value, "");
+
+    static_assert(!std::is_nothrow_invocable_r<int, int&>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, const int&>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, int&&>::value, "");
+
+    static_assert(!std::is_nothrow_invocable_r<int, std::vector<int> >::value,
+                  "");
+    static_assert(!std::is_nothrow_invocable_r<int, std::vector<int*> >::value,
+                  "");
+    static_assert(!std::is_nothrow_invocable_r<int, std::vector<int**> >::value,
+                  "");
+    static_assert(!std::is_nothrow_invocable_r<void, AbominableFunc>::value,
+                  "");
+
+    //  with parameters
+    static_assert(!std::is_nothrow_invocable_r<int, int, int>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<int, int, double, float>::value,
+                  "");
+    static_assert(
+        !std::is_nothrow_invocable_r<int, int, char, float, double>::value, "");
+    static_assert(
+        !std::is_nothrow_invocable_r<void, Sink, AbominableFunc>::value, "");
+    static_assert(!std::is_nothrow_invocable_r<void, Sink, void>::value, "");
+    static_assert(
+        !std::is_nothrow_invocable_r<void, Sink, const volatile void>::value,
+        "");
+  }
+
+  {
+    // Check that the conversion to the return type is properly checked
+    using Fn = CallObject<true, int>;
+    static_assert(std::is_nothrow_invocable_r<Implicit, Fn>::value, "");
+    static_assert(std::is_nothrow_invocable_r<double, Fn>::value, "");
+    static_assert(std::is_nothrow_invocable_r<const volatile void, Fn>::value,
+                  "");
+    static_assert(throws_invocable_r<ThrowsImplicit, Fn>(), "");
+    static_assert(!std::is_nothrow_invocable<Fn(), Explicit>(), "");
+  }
+  {
+    // Check that the conversion to the parameters is properly checked
+    using Fn = CallObject<true, void, const Implicit&, const ThrowsImplicit&>;
+    static_assert(
+        std::is_nothrow_invocable<Fn, Implicit&, ThrowsImplicit&>::value, "");
+    static_assert(std::is_nothrow_invocable<Fn, int, ThrowsImplicit&>::value,
+                  "");
+    static_assert(throws_invocable<Fn, int, int>(), "");
+    static_assert(!std::is_nothrow_invocable<Fn>::value, "");
+  }
+  {
+    // Check that the noexcept-ness of function objects is checked.
+    using Fn = CallObject<true, void>;
+    using Fn2 = CallObject<false, void>;
+    static_assert(std::is_nothrow_invocable<Fn>::value, "");
+    static_assert(throws_invocable<Fn2>(), "");
+  }
+  {
+    // Check that PMD derefs are noexcept
+    using Fn = int(Tag::*);
+    static_assert(std::is_nothrow_invocable<Fn, Tag&>::value, "");
+    static_assert(std::is_nothrow_invocable_r<Implicit, Fn, Tag&>::value, "");
+    static_assert(throws_invocable_r<ThrowsImplicit, Fn, Tag&>(), "");
+  }
+  {
+    // Check for is_nothrow_invocable_v
+    using Fn = CallObject<true, int>;
+    static_assert(std::is_nothrow_invocable_v<Fn>, "");
+    static_assert(!std::is_nothrow_invocable_v<Fn, int>, "");
+  }
+  {
+    // Check for is_nothrow_invocable_r_v
+    using Fn = CallObject<true, int>;
+    static_assert(std::is_nothrow_invocable_r_v<void, Fn>, "");
+    static_assert(!std::is_nothrow_invocable_r_v<int, Fn, int>, "");
+  }
+  test_noexcept_function_pointers();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.rel/is_same.pass.cpp b/test/std/utilities/meta/meta.rel/is_same.pass.cpp
index 9db367391..739713bf4 100644
--- a/test/std/utilities/meta/meta.rel/is_same.pass.cpp
+++ b/test/std/utilities/meta/meta.rel/is_same.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ public:
     ~Class();
 };
 
-int main()
+int main(int, char**)
 {
     test_is_same<int, int>();
     test_is_same<void, void>();
@@ -70,4 +69,6 @@ int main()
     test_is_not_same<Class, int*>();
     test_is_not_same<int*, int&>();
     test_is_not_same<int&, int>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.rqmts/nothing_to_do.pass.cpp b/test/std/utilities/meta/meta.rqmts/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/meta/meta.rqmts/nothing_to_do.pass.cpp
+++ b/test/std/utilities/meta/meta.rqmts/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_all_extents.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_all_extents.pass.cpp
index f7902a2be..a887d52bb 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_all_extents.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_all_extents.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ void test_remove_all_extents()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_remove_all_extents<int, int> ();
     test_remove_all_extents<const Enum, const Enum> ();
@@ -40,4 +39,6 @@ int main()
     test_remove_all_extents<const int[2][3], const int> ();
     test_remove_all_extents<int[1][2][3], int> ();
     test_remove_all_extents<const int[1][2][3], const int> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_extent.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_extent.pass.cpp
index aa175d9eb..a0b19d6a6 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_extent.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.arr/remove_extent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ void test_remove_extent()
 }
 
 
-int main()
+int main(int, char**)
 {
     test_remove_extent<int, int> ();
     test_remove_extent<const Enum, const Enum> ();
@@ -41,4 +40,6 @@ int main()
     test_remove_extent<const int[2][3], const int[3]> ();
     test_remove_extent<int[1][2][3], int[2][3]> ();
     test_remove_extent<const int[1][2][3], const int[2][3]> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.cv/add_const.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.cv/add_const.pass.cpp
index ef1aa8acb..edde65657 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.cv/add_const.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.cv/add_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ void test_add_const()
     test_add_const_imp<const volatile T, const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_add_const<void>();
     test_add_const<int>();
@@ -42,4 +41,6 @@ int main()
     test_add_const<const int&>();
     test_add_const<int*>();
     test_add_const<const int*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.cv/add_cv.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.cv/add_cv.pass.cpp
index c0c2483e4..5621bbf42 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.cv/add_cv.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.cv/add_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ void test_add_cv()
     test_add_cv_imp<const volatile T, const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_add_cv<void>();
     test_add_cv<int>();
@@ -42,4 +41,6 @@ int main()
     test_add_cv<const int&>();
     test_add_cv<int*>();
     test_add_cv<const int*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.cv/add_volatile.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.cv/add_volatile.pass.cpp
index f29fb06cd..6dfaa60f8 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.cv/add_volatile.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.cv/add_volatile.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ void test_add_volatile()
     test_add_volatile_imp<const volatile T, const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_add_volatile<void>();
     test_add_volatile<int>();
@@ -42,4 +41,6 @@ int main()
     test_add_volatile<const int&>();
     test_add_volatile<int*>();
     test_add_volatile<const int*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_const.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_const.pass.cpp
index 426d22d29..3c927e7c9 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_const.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ void test_remove_const()
     test_remove_const_imp<const volatile T, volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_remove_const<void>();
     test_remove_const<int>();
@@ -42,4 +41,6 @@ int main()
     test_remove_const<const int&>();
     test_remove_const<int*>();
     test_remove_const<const int*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_cv.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_cv.pass.cpp
index a6ce05756..2dc8d26e0 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_cv.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_cv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ void test_remove_cv()
     test_remove_cv_imp<const volatile T, T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_remove_cv<void>();
     test_remove_cv<int>();
@@ -42,4 +41,6 @@ int main()
     test_remove_cv<const int&>();
     test_remove_cv<int*>();
     test_remove_cv<const int*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_volatile.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_volatile.pass.cpp
index 90b8d4bcb..fb45d9439 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_volatile.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.cv/remove_volatile.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ void test_remove_volatile()
     test_remove_volatile_imp<const volatile T, const T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_remove_volatile<void>();
     test_remove_volatile<int>();
@@ -42,4 +41,6 @@ int main()
     test_remove_volatile<const int&>();
     test_remove_volatile<int*>();
     test_remove_volatile<volatile int*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp
index d7e35a62f..3e80402e8 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <cstddef>       // for std::max_align_t
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::aligned_storage<10, 1 >::type T1;
@@ -254,9 +253,6 @@ int main()
     // Use alignof(std::max_align_t) below to find the max alignment instead of
     // hardcoding it, because it's different on different platforms.
     // (For example 8 on arm and 16 on x86.)
-#if TEST_STD_VER < 11
-#define alignof __alignof__
-#endif
     {
     typedef std::aligned_storage<16>::type T1;
 #if TEST_STD_VER > 11
@@ -264,7 +260,7 @@ int main()
 #endif
     static_assert(std::is_trivial<T1>::value, "");
     static_assert(std::is_standard_layout<T1>::value, "");
-    static_assert(std::alignment_of<T1>::value == alignof(std::max_align_t),
+    static_assert(std::alignment_of<T1>::value == TEST_ALIGNOF(std::max_align_t),
                   "");
     static_assert(sizeof(T1) == 16, "");
     }
@@ -275,9 +271,9 @@ int main()
 #endif
     static_assert(std::is_trivial<T1>::value, "");
     static_assert(std::is_standard_layout<T1>::value, "");
-    static_assert(std::alignment_of<T1>::value == alignof(std::max_align_t),
+    static_assert(std::alignment_of<T1>::value == TEST_ALIGNOF(std::max_align_t),
                   "");
-    static_assert(sizeof(T1) == 16 + alignof(std::max_align_t), "");
+    static_assert(sizeof(T1) == 16 + TEST_ALIGNOF(std::max_align_t), "");
     }
     {
     typedef std::aligned_storage<10>::type T1;
@@ -289,4 +285,6 @@ int main()
     static_assert(std::alignment_of<T1>::value == 8, "");
     static_assert(sizeof(T1) == 16, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.fail.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.fail.cpp
index efee5064c..cf9fe632d 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.fail.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,9 @@
 
 class A; // Incomplete
 
-int main()
+int main(int, char**)
 {
     typedef std::aligned_union<10, A>::type T1;
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.pass.cpp
index 3e58b51a6..789fd12a9 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::aligned_union<10, char >::type T1;
@@ -112,4 +111,6 @@ int main()
     static_assert(std::alignment_of<T1>::value == 4, "");
     static_assert(sizeof(T1) == 4, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/common_type.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/common_type.pass.cpp
index dbbbe159f..f96603b30 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/common_type.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/common_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -235,7 +234,7 @@ static_assert(is_same<typename result_of<PMD(const S*)>::type, const char&>::val
 } // namespace note_b_example
 #endif // TEST_STD_VER >= 11
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::common_type<int>::type, int>::value), "");
     static_assert((std::is_same<std::common_type<char>::type, char>::value), "");
@@ -308,4 +307,6 @@ int main()
     static_assert((std::is_same<std::common_type<const int, int>::type,       int>::value), "");
     static_assert((std::is_same<std::common_type<int, const int>::type,       int>::value), "");
     static_assert((std::is_same<std::common_type<const int, const int>::type, int>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/conditional.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/conditional.pass.cpp
index 7de0a0737..288376ac9 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/conditional.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/conditional.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::conditional<true, char, int>::type, char>::value), "");
     static_assert((std::is_same<std::conditional<false, char, int>::type, int>::value), "");
@@ -23,4 +22,6 @@ int main()
     static_assert((std::is_same<std::conditional_t<true, char, int>, char>::value), "");
     static_assert((std::is_same<std::conditional_t<false, char, int>, int>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/decay.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/decay.pass.cpp
index c0aece771..94d972039 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/decay.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/decay.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ void test_decay()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_decay<void, void>();
     test_decay<int, int>();
@@ -39,4 +38,6 @@ int main()
     test_decay<int(int)  &, int(int)  &>();
     test_decay<int(int) &&, int(int) &&>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.fail.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.fail.cpp
index 1ab07670f..c033d1aef 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.fail.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,9 @@
 
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     typedef std::enable_if<false>::type A;
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.pass.cpp
index a9b1e1be1..c02c6efdb 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::enable_if<true>::type, void>::value), "");
     static_assert((std::is_same<std::enable_if<true, int>::type, int>::value), "");
@@ -23,4 +22,6 @@ int main()
     static_assert((std::is_same<std::enable_if_t<true>, void>::value), "");
     static_assert((std::is_same<std::enable_if_t<true, int>, int>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if2.fail.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if2.fail.cpp
index 8c9b42d60..79382d359 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if2.fail.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/enable_if2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,9 @@
 
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     typedef std::enable_if_t<false> A;
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp
index e220f591f..e6a01a77a 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ void test_remove_cvref()
     static_assert((std::is_same<         std::remove_cvref_t<T>,     U>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test_remove_cvref<void, void>();
     test_remove_cvref<int, int>();
@@ -49,4 +48,6 @@ int main()
     test_remove_cvref<int(int) volatile, int(int) volatile>();
     test_remove_cvref<int(int)  &, int(int)  &>();
     test_remove_cvref<int(int) &&, int(int) &&>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/result_of.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/result_of.pass.cpp
index 69e805d1e..34dd6d8ea 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/result_of.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/result_of.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -93,7 +92,7 @@ void test_no_result()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     typedef NotDerived ND;
     { // functor object
@@ -367,4 +366,6 @@ int main()
 #endif
     test_no_result<PMD(ND&)>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/result_of11.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/result_of11.pass.cpp
index 2b8cd7096..4c020d3da 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/result_of11.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/result_of11.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -56,7 +55,7 @@ void test_result_of_imp()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef char F::*PMD;
@@ -169,4 +168,6 @@ int main()
     test_result_of_imp<int (F::* (std::unique_ptr<const F> ))       () const, int>();
     }
     test_result_of_imp<decltype(&wat::foo)(wat), void>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/type_identity.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/type_identity.pass.cpp
index 079986685..7e90c3df9 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/type_identity.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/type_identity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -23,7 +22,7 @@ void test_type_identity()
     static_assert((std::is_same<         std::type_identity_t<T>,     T>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test_type_identity<void>();
     test_type_identity<int>();
@@ -37,4 +36,6 @@ int main()
     test_type_identity<int(int) volatile>();
     test_type_identity<int(int)  &>();
     test_type_identity<int(int) &&>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp
index b00798b72..be1c739ee 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ enum E { V = INT_MIN };
 enum F { W = UINT_MAX };
 #endif // TEST_UNSIGNED_UNDERLYING_TYPE
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::underlying_type<E>::type, int>::value),
                   "E has the wrong underlying type");
@@ -53,4 +52,6 @@ int main()
     static_assert((std::is_same<std::underlying_type_t<G>, char>::value), "");
 #endif // TEST_STD_VER > 11
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.ptr/add_pointer.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.ptr/add_pointer.pass.cpp
index 51b3e5d73..22c0b79d6 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.ptr/add_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.ptr/add_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test_function1()
 
 struct Foo {};
 
-int main()
+int main(int, char**)
 {
     test_add_pointer<void, void*>();
     test_add_pointer<int, int*>();
@@ -77,4 +76,6 @@ int main()
     test_function0<void (Foo::*)() const &>();
     test_function0<void (Foo::*)() const &&>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.ptr/remove_pointer.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.ptr/remove_pointer.pass.cpp
index cccbb6011..ba7cceb29 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.ptr/remove_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.ptr/remove_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ void test_remove_pointer()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_remove_pointer<void, void>();
     test_remove_pointer<int, int>();
@@ -41,4 +40,6 @@ int main()
     test_remove_pointer<int(*)[3], int[3]>();
     test_remove_pointer<int*&, int*&>();
     test_remove_pointer<const int*&, const int*&>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.ref/add_lvalue_ref.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.ref/add_lvalue_ref.pass.cpp
index c82c28299..dadcafca6 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.ref/add_lvalue_ref.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.ref/add_lvalue_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ void test_function1()
 
 struct Foo {};
 
-int main()
+int main(int, char**)
 {
     test_add_lvalue_reference<void, void>();
     test_add_lvalue_reference<int, int&>();
@@ -76,4 +75,6 @@ int main()
     test_function0<void (Foo::*)() const &>();
     test_function0<void (Foo::*)() const &&>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.ref/add_rvalue_ref.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.ref/add_rvalue_ref.pass.cpp
index 373bad7d6..34c6cd3dd 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.ref/add_rvalue_ref.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.ref/add_rvalue_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_function1()
 
 struct Foo {};
 
-int main()
+int main(int, char**)
 {
     test_add_rvalue_reference<void, void>();
     test_add_rvalue_reference<int, int&&>();
@@ -74,4 +73,6 @@ int main()
     test_function0<void (Foo::*)() &&>();
     test_function0<void (Foo::*)() const &>();
     test_function0<void (Foo::*)() const &&>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.ref/remove_ref.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.ref/remove_ref.pass.cpp
index 1f9ec2476..5612ba678 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.ref/remove_ref.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.ref/remove_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ void test_remove_reference()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_remove_reference<void, void>();
     test_remove_reference<int, int>();
@@ -44,4 +43,6 @@ int main()
     test_remove_reference<int*&&, int*>();
     test_remove_reference<const int*&&, const int*>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp
index 06f6e6152..fa6ce8e3e 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ void test_make_signed()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_make_signed< signed char, signed char >();
     test_make_signed< unsigned char, signed char >();
@@ -67,4 +66,6 @@ int main()
     test_make_signed< HugeEnum, __int128_t >();
 # endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp b/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp
index 3d152f604..cf5404f8c 100644
--- a/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ void test_make_unsigned()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_make_unsigned<signed char, unsigned char> ();
     test_make_unsigned<unsigned char, unsigned char> ();
@@ -68,4 +67,6 @@ int main()
     test_make_unsigned<HugeEnum, __uint128_t>();
 # endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.trans/nothing_to_do.pass.cpp b/test/std/utilities/meta/meta.trans/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/meta/meta.trans/nothing_to_do.pass.cpp
+++ b/test/std/utilities/meta/meta.trans/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.type.synop/endian.pass.cpp b/test/std/utilities/meta/meta.type.synop/endian.pass.cpp
index 865c477e7..52924b357 100644
--- a/test/std/utilities/meta/meta.type.synop/endian.pass.cpp
+++ b/test/std/utilities/meta/meta.type.synop/endian.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
     static_assert(std::is_enum<std::endian>::value, "");
 
 // Check that E is a scoped enum by checking for conversions.
@@ -44,4 +43,6 @@ int main() {
 
     assert ((c[0] == 1) == (std::endian::native == std::endian::big));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.type.synop/nothing_to_do.pass.cpp b/test/std/utilities/meta/meta.type.synop/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/meta/meta.type.synop/nothing_to_do.pass.cpp
+++ b/test/std/utilities/meta/meta.type.synop/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp b/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
index 0f55db647..43cc5bfce 100644
--- a/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
+++ b/test/std/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,6 +18,9 @@
 template <class T, unsigned A>
 void test_alignment_of()
 {
+    const unsigned AlignofResult = TEST_ALIGNOF(T);
+    static_assert( AlignofResult == A, "Golden value does not match result of alignof keyword");
+    static_assert( std::alignment_of<T>::value == AlignofResult, "");
     static_assert( std::alignment_of<T>::value == A, "");
     static_assert( std::alignment_of<const T>::value == A, "");
     static_assert( std::alignment_of<volatile T>::value == A, "");
@@ -37,7 +39,7 @@ public:
     ~Class();
 };
 
-int main()
+int main(int, char**)
 {
     test_alignment_of<int&, 4>();
     test_alignment_of<Class, 1>();
@@ -45,11 +47,16 @@ int main()
     test_alignment_of<const int*, sizeof(intptr_t)>();
     test_alignment_of<char[3], 1>();
     test_alignment_of<int, 4>();
-    test_alignment_of<double, 8>();
+    // The test case below is a hack. It's hard to detect what golden value
+    // we should expect. In most cases it should be 8. But in i386 builds
+    // with Clang >= 8 or GCC >= 8 the value is '4'.
+    test_alignment_of<double, TEST_ALIGNOF(double)>();
 #if (defined(__ppc__) && !defined(__ppc64__))
     test_alignment_of<bool, 4>();   // 32-bit PPC has four byte bool
 #else
     test_alignment_of<bool, 1>();
 #endif
     test_alignment_of<unsigned, 4>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary.prop.query/extent.pass.cpp b/test/std/utilities/meta/meta.unary.prop.query/extent.pass.cpp
index 39a7c2b59..927ce1373 100644
--- a/test/std/utilities/meta/meta.unary.prop.query/extent.pass.cpp
+++ b/test/std/utilities/meta/meta.unary.prop.query/extent.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,7 +50,7 @@ public:
     ~Class();
 };
 
-int main()
+int main(int, char**)
 {
     test_extent<void, 0>();
     test_extent<int&, 0>();
@@ -71,4 +70,6 @@ int main()
     test_extent1<int[2], 0>();
     test_extent1<int[2][4], 4>();
     test_extent1<int[][4], 4>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary.prop.query/rank.pass.cpp b/test/std/utilities/meta/meta.unary.prop.query/rank.pass.cpp
index 755269d1d..6c2eecb86 100644
--- a/test/std/utilities/meta/meta.unary.prop.query/rank.pass.cpp
+++ b/test/std/utilities/meta/meta.unary.prop.query/rank.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ public:
     ~Class();
 };
 
-int main()
+int main(int, char**)
 {
     test_rank<void, 0>();
     test_rank<int&, 0>();
@@ -51,4 +50,6 @@ int main()
     test_rank<char[3], 1>();
     test_rank<char[][3], 2>();
     test_rank<char[][4][3], 3>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary.prop.query/void_t.pass.cpp b/test/std/utilities/meta/meta.unary.prop.query/void_t.pass.cpp
index 2d10fb004..652eddaa8 100644
--- a/test/std/utilities/meta/meta.unary.prop.query/void_t.pass.cpp
+++ b/test/std/utilities/meta/meta.unary.prop.query/void_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ public:
     ~Class();
 };
 
-int main()
+int main(int, char**)
 {
     static_assert( std::is_same<void, std::void_t<>>::value, "");
 
@@ -65,4 +64,6 @@ int main()
     test2<void *, int&>();
 
     static_assert( std::is_same<void, std::void_t<int, double const &, Class, volatile int[], void>>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary.prop.query/void_t_feature_test_macro.pass.cpp b/test/std/utilities/meta/meta.unary.prop.query/void_t_feature_test_macro.pass.cpp
index f188c098c..90514eaae 100644
--- a/test/std/utilities/meta/meta.unary.prop.query/void_t_feature_test_macro.pass.cpp
+++ b/test/std/utilities/meta/meta.unary.prop.query/void_t_feature_test_macro.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,9 +27,11 @@
 # endif
 #endif
 
-int main()
+int main(int, char**)
 {
 #if defined(__cpp_lib_void_t)
   static_assert(std::is_same_v<std::void_t<int>, void>, "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/array.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/array.pass.cpp
index ef1fc4040..9f3d8f558 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/array.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ typedef const char const_array[3];
 typedef char incomplete_array[];
 struct Incomplete;
 
-int main()
+int main(int, char**)
 {
     test_array<array>();
     test_array<const_array>();
@@ -58,4 +57,6 @@ int main()
 
 //  LWG#2582
     static_assert(!std::is_array<Incomplete>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp
index 8c8510882..3dd696932 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,11 +49,13 @@ class Class
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_class<Class>();
     test_class<incomplete_type>();
 
 //  LWG#2582
     static_assert( std::is_class<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/enum.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/enum.pass.cpp
index 40dea443c..5fa849930 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/enum.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/enum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,10 +46,12 @@ void test_enum()
 enum Enum {zero, one};
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_enum<Enum>();
 
 //  LWG#2582
     static_assert(!std::is_enum<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/floating_point.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/floating_point.pass.cpp
index 217bc7e25..1f7556c7a 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/floating_point.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/floating_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test_floating_point()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_floating_point<float>();
     test_floating_point<double>();
@@ -54,4 +53,6 @@ int main()
 
 //  LWG#2582
     static_assert(!std::is_floating_point<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/function.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/function.pass.cpp
index 3f21b9a7d..d7453be46 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/function.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ void test()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     TEST_REGULAR( void () );
     TEST_REGULAR( void (int) );
@@ -90,4 +89,6 @@ int main()
 
 //  LWG#2582
     static_assert(!std::is_function<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/integral.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/integral.pass.cpp
index a50beeb3e..df66316b9 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/integral.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void test_integral()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_integral<bool>();
     test_integral<char>();
@@ -68,4 +67,6 @@ int main()
 
 //  LWG#2582
     static_assert(!std::is_integral<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_array.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_array.pass.cpp
index dfd09ac52..320581991 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_array.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_array<char[3]>();
     test_is_array<char[]>();
@@ -91,4 +90,6 @@ int main()
     test_is_not_array<bit_zero>();
     test_is_not_array<NotEmpty>();
     test_is_not_array<incomplete_type>();  //  LWG#2582
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_class.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_class.pass.cpp
index 3c1a2181d..def798b77 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_class.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_class.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_class<Empty>();
     test_is_class<bit_zero>();
@@ -97,4 +96,6 @@ int main()
     test_is_not_class<Enum>();
     test_is_not_class<Union>();
     test_is_not_class<FunctionPtr>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_enum.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_enum.pass.cpp
index 2603bdff2..7d4b67fd8 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_enum.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_enum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_enum<Enum>();
 
@@ -92,4 +91,6 @@ int main()
     test_is_not_enum<Abstract>();
     test_is_not_enum<FunctionPtr>();
     test_is_not_enum<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_floating_point.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_floating_point.pass.cpp
index 7e19c0629..e628451dc 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_floating_point.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_floating_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_floating_point<float>();
     test_is_floating_point<double>();
@@ -100,4 +99,6 @@ int main()
     test_is_not_floating_point<Enum>();
     test_is_not_floating_point<FunctionPtr>();
     test_is_not_floating_point<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_function.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_function.pass.cpp
index 23d517612..b582499cb 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_function.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_function<void(void)>();
     test_is_function<int(int)>();
@@ -106,4 +105,6 @@ int main()
   test_is_function<void() noexcept>();
   test_is_function<void() const && noexcept>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_integral.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_integral.pass.cpp
index 85c2c9817..216df3b56 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_integral.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ struct incomplete_type;
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
     test_is_integral<short>();
     test_is_integral<unsigned short>();
@@ -106,4 +105,6 @@ int main()
     test_is_not_integral<NotEmpty>();
     test_is_not_integral<Abstract>();
     test_is_not_integral<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_lvalue_reference.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_lvalue_reference.pass.cpp
index 41b8d44b9..ed32cd9b9 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_lvalue_reference.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_lvalue_reference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_lvalue_reference<int&>();
 
@@ -94,4 +93,6 @@ int main()
     test_is_not_lvalue_reference<NotEmpty>();
     test_is_not_lvalue_reference<Abstract>();
     test_is_not_lvalue_reference<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_object_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_object_pointer.pass.cpp
index 9498edc65..95a8b5585 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_object_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_object_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ struct incomplete_type;
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
     test_is_member_object_pointer<int Abstract::*>();
     test_is_member_object_pointer<double NotEmpty::*>();
@@ -96,4 +95,6 @@ int main()
     test_is_not_member_object_pointer<NotEmpty>();
     test_is_not_member_object_pointer<Abstract>();
     test_is_not_member_object_pointer<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_pointer.pass.cpp
index a63a88c4d..cf46c7261 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_member_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -72,7 +71,7 @@ struct incomplete_type;
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
     test_is_member_pointer<int Abstract::*>();
     test_is_member_pointer<double NotEmpty::*>();
@@ -103,4 +102,6 @@ int main()
   test_is_member_pointer<int (Empty::*)(int, long, long) const noexcept>();
   test_is_member_pointer<int (Empty::*)() & noexcept>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_null_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_null_pointer.pass.cpp
index f57576330..7ad765d8b 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_null_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_null_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_null_pointer<std::nullptr_t>();
 
@@ -94,4 +93,6 @@ int main()
     test_is_not_null_pointer<NotEmpty>();
     test_is_not_null_pointer<Abstract>();
     test_is_not_null_pointer<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_pointer.pass.cpp
index 257719eb9..18609b812 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_pointer<void*>();
     test_is_pointer<int*>();
@@ -93,4 +92,6 @@ int main()
     test_is_not_pointer<NotEmpty>();
     test_is_not_pointer<Abstract>();
     test_is_not_pointer<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_rvalue_reference.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_rvalue_reference.pass.cpp
index 89639377c..d17ed5fee 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_rvalue_reference.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_rvalue_reference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_rvalue_reference<int&&>();
 
@@ -94,4 +93,6 @@ int main()
     test_is_not_rvalue_reference<NotEmpty>();
     test_is_not_rvalue_reference<Abstract>();
     test_is_not_rvalue_reference<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_union.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_union.pass.cpp
index 415d9a781..a86147a9a 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_union.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_union.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_union<Union>();
 
@@ -92,4 +91,6 @@ int main()
     test_is_not_union<NotEmpty>();
     test_is_not_union<Abstract>();
     test_is_not_union<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_void.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_void.pass.cpp
index 952a5b748..ccbca9753 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/is_void.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/is_void.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct incomplete_type;
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
     test_is_void<void>();
 
@@ -91,4 +90,6 @@ int main()
     test_is_not_void<Enum>();
     test_is_not_void<FunctionPtr>();
     test_is_not_void<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/lvalue_ref.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/lvalue_ref.pass.cpp
index 5154a1d12..1c431edfa 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/lvalue_ref.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/lvalue_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,11 +37,13 @@ void test_lvalue_ref()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_lvalue_ref<int&>();
     test_lvalue_ref<const int&>();
 
 //  LWG#2582
     static_assert(!std::is_lvalue_reference<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer.pass.cpp
index f685d71ee..fdbfd9039 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ class Class
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
   test_member_function_pointer<void (Class::*)()>();
   test_member_function_pointer<void (Class::*)(int)>();
@@ -226,4 +225,6 @@ int main()
 
 //  LWG#2582
   static_assert(!std::is_member_function_pointer<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer_no_variadics.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer_no_variadics.pass.cpp
index cdaf713ac..916c580d5 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer_no_variadics.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/member_function_pointer_no_variadics.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ class Class
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_member_function_pointer<void (Class::*)()>();
     test_member_function_pointer<void (Class::*)(int)>();
@@ -80,4 +79,6 @@ int main()
 
 //  LWG#2582
     static_assert(!std::is_member_function_pointer<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/member_object_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/member_object_pointer.pass.cpp
index 76deef429..b22e59e37 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/member_object_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/member_object_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,10 +49,12 @@ class Class
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_member_object_pointer<int Class::*>();
 
 //  LWG#2582
     static_assert(!std::is_member_object_pointer<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/nullptr.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/nullptr.pass.cpp
index 076204c9c..0b25ac1ba 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/nullptr.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/nullptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,11 +11,11 @@
 // nullptr_t
 //  is_null_pointer
 
+// UNSUPPORTED: c++98, c++03, c++11
+
 #include <type_traits>
 #include <cstddef>        // for std::nullptr_t
-#include "test_macros.h"
 
-#if TEST_STD_VER > 11
 template <class T>
 void test_nullptr_imp()
 {
@@ -47,13 +46,11 @@ void test_nullptr()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_nullptr<std::nullptr_t>();
 
 //  LWG#2582
     static_assert(!std::is_null_pointer<incomplete_type>::value, "");
+    return 0;
 }
-#else
-int main() {}
-#endif
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/pointer.pass.cpp
index f9c83c67d..68f4186db 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_pointer()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_pointer<void*>();
     test_pointer<int*>();
@@ -56,4 +55,6 @@ int main()
 
 //  LWG#2582
     static_assert(!std::is_pointer<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/rvalue_ref.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/rvalue_ref.pass.cpp
index 23d391b49..e40a2a014 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/rvalue_ref.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/rvalue_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,11 +38,13 @@ void test_rvalue_ref()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_rvalue_ref<int&&>();
     test_rvalue_ref<const int&&>();
 
 //  LWG#2582
     static_assert(!std::is_rvalue_reference<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/union.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/union.pass.cpp
index 36ad00400..a840f5bb2 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/union.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/union.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,10 +51,12 @@ union Union
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_union<Union>();
 
 //  LWG#2582
     static_assert(!std::is_union<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.cat/void.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.cat/void.pass.cpp
index c7597eb4e..d9defa528 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.cat/void.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.cat/void.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,10 +45,12 @@ void test_void()
 
 struct incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_void<void>();
 
 //  LWG#2582
     static_assert(!std::is_void<incomplete_type>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/array.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/array.pass.cpp
index f601bd12c..487e14446 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/array.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,10 +39,12 @@ typedef char incomplete_array[];
 
 class incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_array<array>();
     test_array<const_array>();
     test_array<incomplete_array>();
     test_array<incomplete_type[]>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/class.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/class.pass.cpp
index 5fa5da12a..bc072198f 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/class.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/class.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,8 +39,10 @@ class Class
 
 class incomplete_type;
 
-int main()
+int main(int, char**)
 {
     test_class<Class>();
     test_class<incomplete_type>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/enum.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/enum.pass.cpp
index dc9e4874a..71c74f2ba 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/enum.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/enum.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,9 @@ void test_enum()
 
 enum Enum {zero, one};
 
-int main()
+int main(int, char**)
 {
     test_enum<Enum>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/floating_point.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/floating_point.pass.cpp
index 3560b456b..957473c2a 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/floating_point.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/floating_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,9 +33,11 @@ void test_floating_point()
     test_floating_point_imp<const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_floating_point<float>();
     test_floating_point<double>();
     test_floating_point<long double>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/function.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/function.pass.cpp
index fc8a1e5a8..c27b1237e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/function.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/function.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,10 +33,12 @@ void test_function()
     test_function_imp<const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_function<void ()>();
     test_function<void (int)>();
     test_function<int (double)>();
     test_function<int (double, char)>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/integral.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/integral.pass.cpp
index 0bc94583a..cac606a51 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/integral.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/integral.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ void test_integral()
     test_integral_imp<const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_integral<bool>();
     test_integral<char>();
@@ -53,4 +52,6 @@ int main()
     test_integral<__int128_t>();
     test_integral<__uint128_t>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_arithmetic.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_arithmetic.pass.cpp
index 02c539712..683e885e2 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_arithmetic.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_arithmetic.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ enum Enum {zero, one};
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
     test_is_arithmetic<short>();
     test_is_arithmetic<unsigned short>();
@@ -104,4 +103,6 @@ int main()
     test_is_not_arithmetic<bit_zero>();
     test_is_not_arithmetic<NotEmpty>();
     test_is_not_arithmetic<Abstract>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_compound.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_compound.pass.cpp
index d8d5162c1..4d789066d 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_compound.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_compound.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ enum Enum {zero, one};
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
     test_is_compound<char[3]>();
     test_is_compound<char[]>();
@@ -95,4 +94,6 @@ int main()
     test_is_not_compound<void>();
     test_is_not_compound<int>();
     test_is_not_compound<double>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_fundamental.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_fundamental.pass.cpp
index 052b0b985..b1a383602 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_fundamental.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_fundamental.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ enum Enum {zero, one};
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
     test_is_fundamental<std::nullptr_t>();
     test_is_fundamental<void>();
@@ -112,4 +111,6 @@ int main()
     test_is_not_fundamental<Enum>();
     test_is_not_fundamental<NotEmpty>();
     test_is_not_fundamental<Abstract>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_member_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_member_pointer.pass.cpp
index c2804885a..82f0ae9aa 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_member_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_member_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ enum Enum {zero, one};
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
 //  Arithmetic types (3.9.1), enumeration types, pointer types, pointer to member types (3.9.2),
 //    std::nullptr_t, and cv-qualified versions of these types (3.9.3)
@@ -102,4 +101,6 @@ int main()
     test_is_not_member_pointer<int(int)>();
     test_is_not_member_pointer<Enum>();
     test_is_not_member_pointer<FunctionPtr>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_object.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_object.pass.cpp
index 311215b81..8a6f6d84c 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_object.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_object.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ enum Enum {zero, one};
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
 // An object type is a (possibly cv-qualified) type that is not a function type,
 // not a reference type, and not a void type.
@@ -100,4 +99,6 @@ int main()
     test_is_not_object<int&>();
     test_is_not_object<int&&>();
     test_is_not_object<int(int)>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_reference.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_reference.pass.cpp
index b546458bd..bb8a2d62c 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_reference.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_reference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ enum Enum {zero, one};
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
     test_is_reference<int&>();
 #if TEST_STD_VER >= 11
@@ -101,4 +100,6 @@ int main()
     test_is_not_reference<int Empty::*>();
     test_is_not_reference<void (Empty::*)(int)>();
 
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_scalar.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_scalar.pass.cpp
index 39ac07ad4..804c6848e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/is_scalar.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/is_scalar.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ enum Enum {zero, one};
 typedef void (*FunctionPtr)();
 
 
-int main()
+int main(int, char**)
 {
 //  Arithmetic types (3.9.1), enumeration types, pointer types, pointer to member types (3.9.2),
 //    std::nullptr_t, and cv-qualified versions of these types (3.9.3)
@@ -111,4 +110,6 @@ int main()
     test_is_not_scalar<NotEmpty>();
     test_is_not_scalar<Abstract>();
     test_is_not_scalar<int(int)>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/lvalue_ref.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/lvalue_ref.pass.cpp
index dd812832f..44027dadb 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/lvalue_ref.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/lvalue_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ void test_lvalue_ref()
     static_assert(!std::is_member_pointer<T>::value, "");
 }
 
-int main()
+int main(int, char**)
 {
     test_lvalue_ref<int&>();
     test_lvalue_ref<const int&>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/member_function_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/member_function_pointer.pass.cpp
index 0df21173c..fda2e8181 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/member_function_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/member_function_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,9 +37,11 @@ class Class
 {
 };
 
-int main()
+int main(int, char**)
 {
     test_member_function_pointer<void (Class::*)()>();
     test_member_function_pointer<void (Class::*)(int)>();
     test_member_function_pointer<void (Class::*)(int, char)>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/member_object_pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/member_object_pointer.pass.cpp
index a0dea4a9c..3e8117b6a 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/member_object_pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/member_object_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -38,7 +37,9 @@ class Class
 {
 };
 
-int main()
+int main(int, char**)
 {
     test_member_object_pointer<int Class::*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/pointer.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/pointer.pass.cpp
index de23da836..f5677b95b 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/pointer.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,10 +33,12 @@ void test_pointer()
     test_pointer_imp<const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_pointer<void*>();
     test_pointer<int*>();
     test_pointer<const int*>();
     test_pointer<void (*)(int)>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/rvalue_ref.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/rvalue_ref.pass.cpp
index b9b28fd8c..341b94626 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/rvalue_ref.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/rvalue_ref.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,8 +26,10 @@ void test_rvalue_ref()
     static_assert(!std::is_member_pointer<T>::value, "");
 }
 
-int main()
+int main(int, char**)
 {
     test_rvalue_ref<int&&>();
     test_rvalue_ref<const int&&>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/union.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/union.pass.cpp
index 05db74c8a..fb48a70f3 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/union.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/union.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,9 @@ union Union
     double __;
 };
 
-int main()
+int main(int, char**)
 {
     test_union<Union>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.comp/void.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.comp/void.pass.cpp
index 59569fe08..657f72774 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.comp/void.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.comp/void.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ void test_void()
     test_void_imp<const volatile T>();
 }
 
-int main()
+int main(int, char**)
 {
     test_void<void>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp
index 52100c304..e6f70123b 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -81,7 +80,7 @@ struct B
 };
 
 
-int main()
+int main(int, char**)
 {
     test_has_not_has_unique_object_representations<void>();
     test_has_not_has_unique_object_representations<Empty>();
@@ -103,4 +102,6 @@ int main()
     test_has_unique_object_representations<char[3]>();
     test_has_unique_object_representations<char[]>();
 
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/has_virtual_destructor.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/has_virtual_destructor.pass.cpp
index 7330f4b35..57c1027c3 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/has_virtual_destructor.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/has_virtual_destructor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct A
     ~A();
 };
 
-int main()
+int main(int, char**)
 {
     test_has_not_virtual_destructor<void>();
     test_has_not_virtual_destructor<A>();
@@ -88,4 +87,6 @@ int main()
 
     test_has_virtual_destructor<Abstract>();
     test_has_virtual_destructor<NotEmpty>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp
index 99ca74cc2..ee6a12e4b 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_abstract.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ struct AbstractTemplate {
 template <>
 struct AbstractTemplate<double> {};
 
-int main()
+int main(int, char**)
 {
     test_is_not_abstract<void>();
     test_is_not_abstract<int&>();
@@ -91,4 +90,6 @@ int main()
     test_is_abstract<Abstract>();
     test_is_abstract<AbstractTemplate<int> >();
     test_is_not_abstract<AbstractTemplate<double> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_aggregate.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_aggregate.pass.cpp
index 9c72d4d44..843231f46 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_aggregate.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_aggregate.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -57,7 +56,7 @@ private:
 struct Union { int x; void* y; };
 
 
-int main ()
+int main(int, char**)
 {
   {
     test_false<void>();
@@ -76,4 +75,6 @@ int main ()
     test_true<Aggregate[42][101]>();
     test_true<Union>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_assignable.pass.cpp
index 4808a4dc9..8e5e2cc6e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ struct E
 template <typename T>
 struct X { T t; };
 
-int main()
+int main(int, char**)
 {
     test_is_assignable<int&, int&> ();
     test_is_assignable<int&, int> ();
@@ -80,4 +79,6 @@ int main()
 
 //  pointer to incomplete template type
     test_is_assignable<X<D>*&, X<D>*> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_const.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_const.pass.cpp
index 616f25180..0af73cf7e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_const.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ void test_is_const()
 
 struct A; // incomplete
 
-int main()
+int main(int, char**)
 {
     test_is_const<void>();
     test_is_const<int>();
@@ -45,4 +44,6 @@ int main()
 
     static_assert(!std::is_const<int&>::value, "");
     static_assert(!std::is_const<const int&>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_constructible.pass.cpp
index b90363a5c..a5b723c0e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -148,7 +147,7 @@ static constexpr bool clang_disallows_valid_static_cast_bug =
 #endif
 
 
-int main()
+int main(int, char**)
 {
     typedef Base B;
     typedef Derived D;
@@ -302,4 +301,6 @@ int main()
     test_is_not_constructible<void() &&> ();
 #endif
 #endif // TEST_STD_VER >= 11
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_assignable.pass.cpp
index 06cf80078..3f10907a4 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ struct C
     void operator=(C&);  // not const
 };
 
-int main()
+int main(int, char**)
 {
     test_is_copy_assignable<int> ();
     test_is_copy_assignable<int&> ();
@@ -82,4 +81,6 @@ int main()
 #endif
     test_is_not_copy_assignable<void> ();
     test_is_not_copy_assignable<C> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_constructible.pass.cpp
index 684d85d3d..f64c40e86 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_copy_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -71,7 +70,7 @@ struct C
     void operator=(C&);  // not const
 };
 
-int main()
+int main(int, char**)
 {
     test_is_copy_constructible<A>();
     test_is_copy_constructible<int&>();
@@ -92,4 +91,6 @@ int main()
 #if TEST_STD_VER >= 11
     test_is_not_copy_constructible<B>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_default_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_default_constructible.pass.cpp
index 22755dc33..ce2ec9561 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_default_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_default_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -82,7 +81,7 @@ class B
     B();
 };
 
-int main()
+int main(int, char**)
 {
     test_is_default_constructible<A>();
     test_is_default_constructible<Union>();
@@ -123,4 +122,6 @@ int main()
     test_is_not_default_constructible<void() &&> ();
 #endif
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_destructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_destructible.pass.cpp
index 5e8bfeaa4..1a32efa42 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_destructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_destructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -98,7 +97,7 @@ struct DeletedVirtualPrivateDestructor   { private:   virtual ~DeletedVirtualPri
 #endif
 
 
-int main()
+int main(int, char**)
 {
     test_is_destructible<A>();
     test_is_destructible<int&>();
@@ -143,4 +142,6 @@ int main()
     test_is_not_destructible<NotEmpty>();
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_empty.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_empty.pass.cpp
index 7be76f4fa..850af8b7a 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_empty.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_empty.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -79,7 +78,7 @@ struct bit_one
     int :  1;
 };
 
-int main()
+int main(int, char**)
 {
     test_is_not_empty<void>();
     test_is_not_empty<int&>();
@@ -101,4 +100,6 @@ int main()
     test_is_empty<EmptyBase>();
     test_is_empty<StaticMember>();
     test_is_empty<bit_zero>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_final.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_final.pass.cpp
index 5a440598b..4cded0f92 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_final.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_final.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void test_is_not_final()
 #endif
 }
 
-int main ()
+int main(int, char**)
 {
     test_is_not_final<int>();
     test_is_not_final<int*>();
@@ -59,4 +58,6 @@ int main ()
     test_is_not_final<U1*>();
     test_is_final    <U2>();
     test_is_not_final<U2*>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_literal_type.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_literal_type.pass.cpp
index 7ead5f5d5..b86ff5a85 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_literal_type.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_literal_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,7 @@ enum Enum {zero, one};
 
 typedef void (*FunctionPtr)();
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     test_is_literal_type<std::nullptr_t>();
@@ -102,4 +101,6 @@ int main()
 
     test_is_not_literal_type<NotEmpty>();
     test_is_not_literal_type<Abstract>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_assignable.pass.cpp
index 6209bc7b1..5a330c6d3 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ struct A
     A();
 };
 
-int main()
+int main(int, char**)
 {
     test_is_move_assignable<int> ();
     test_is_move_assignable<A> ();
@@ -69,4 +68,6 @@ int main()
     test_is_not_move_assignable<int[3]> ();
 #endif
     test_is_not_move_assignable<void> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_constructible.pass.cpp
index e81f8d4f4..06ca5c463 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_move_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ struct B
 #endif
 };
 
-int main()
+int main(int, char**)
 {
     test_is_not_move_constructible<char[3]>();
     test_is_not_move_constructible<char[]>();
@@ -85,4 +84,6 @@ int main()
     test_is_move_constructible<NotEmpty>();
     test_is_move_constructible<bit_zero>();
     test_is_move_constructible<B>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_assignable.pass.cpp
index 3349a9d3a..be1f016a4 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ struct C
     void operator=(C&);  // not const
 };
 
-int main()
+int main(int, char**)
 {
     test_is_nothrow_assignable<int&, int&> ();
     test_is_nothrow_assignable<int&, int> ();
@@ -59,4 +58,6 @@ int main()
     test_is_not_nothrow_assignable<B, A> ();
     test_is_not_nothrow_assignable<A, B> ();
     test_is_not_nothrow_assignable<C, C&> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_constructible.pass.cpp
index f36b80cac..0d171261a 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -98,7 +97,7 @@ struct Tuple {
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     test_is_nothrow_constructible<int> ();
     test_is_nothrow_constructible<int, const int&> ();
@@ -115,4 +114,6 @@ int main()
     static_assert(!std::is_constructible<Tuple&, Empty>::value, "");
     test_is_not_nothrow_constructible<Tuple &, Empty> (); // See bug #19616.
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_assignable.pass.cpp
index 01c9bd0d0..64895adf4 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct A
     A& operator=(const A&);
 };
 
-int main()
+int main(int, char**)
 {
     test_has_nothrow_assign<int&>();
     test_has_nothrow_assign<Union>();
@@ -69,4 +68,6 @@ int main()
     test_has_not_nothrow_assign<void>();
     test_has_not_nothrow_assign<A>();
 
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_constructible.pass.cpp
index 9dbdc4e2a..6b1708839 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_copy_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ struct A
     A(const A&);
 };
 
-int main()
+int main(int, char**)
 {
     test_has_not_nothrow_copy_constructor<void>();
     test_has_not_nothrow_copy_constructor<A>();
@@ -69,4 +68,6 @@ int main()
     test_is_nothrow_copy_constructible<int*>();
     test_is_nothrow_copy_constructible<const int*>();
     test_is_nothrow_copy_constructible<bit_zero>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_default_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_default_constructible.pass.cpp
index 9484b321c..c30facc51 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_default_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_default_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,7 +67,7 @@ struct DThrows
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     test_has_not_nothrow_default_constructor<void>();
     test_has_not_nothrow_default_constructor<int&>();
@@ -85,4 +84,6 @@ int main()
     test_is_nothrow_default_constructible<const int*>();
     test_is_nothrow_default_constructible<char[3]>();
     test_is_nothrow_default_constructible<bit_zero>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_destructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_destructible.pass.cpp
index 58e0e0f98..817d696d1 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_destructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_destructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -80,7 +79,7 @@ class Abstract
 };
 
 
-int main()
+int main(int, char**)
 {
     test_is_not_nothrow_destructible<void>();
     test_is_not_nothrow_destructible<char[]>();
@@ -111,4 +110,6 @@ int main()
     test_is_not_nothrow_destructible<PureProtectedDestructor>();
     test_is_not_nothrow_destructible<PurePrivateDestructor>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_assignable.pass.cpp
index 11852f6ae..4bcbabbcc 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct A
     A& operator=(const A&);
 };
 
-int main()
+int main(int, char**)
 {
     test_has_nothrow_assign<int&>();
     test_has_nothrow_assign<Union>();
@@ -67,4 +66,6 @@ int main()
 
     test_has_not_nothrow_assign<void>();
     test_has_not_nothrow_assign<A>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_constructible.pass.cpp
index b93dbb634..ab9e0c6bb 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_move_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ struct A
     A(const A&);
 };
 
-int main()
+int main(int, char**)
 {
     test_has_not_nothrow_move_constructor<void>();
     test_has_not_nothrow_move_constructor<A>();
@@ -69,4 +68,6 @@ int main()
     test_is_nothrow_move_constructible<int*>();
     test_is_nothrow_move_constructible<const int*>();
     test_is_nothrow_move_constructible<bit_zero>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable.pass.cpp
index 7510b4e72..f554199c6 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ struct ThrowingMove {
 
 } // namespace MyNS
 
-int main()
+int main(int, char**)
 {
     using namespace MyNS;
     {
@@ -80,4 +79,6 @@ int main()
         static_assert(std::is_nothrow_swappable_v<int>, "");
         static_assert(!std::is_nothrow_swappable_v<void>, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable_with.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable_with.pass.cpp
index b23a5e45f..fb4beac17 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable_with.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable_with.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void swap(M&&, M&&) noexcept {}
 
 } // namespace MyNS
 
-int main()
+int main(int, char**)
 {
     using namespace MyNS;
     {
@@ -78,4 +77,6 @@ int main()
         static_assert(std::is_nothrow_swappable_with_v<int&, int&>, "");
         static_assert(!std::is_nothrow_swappable_with_v<int&&, int&&>, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_pod.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_pod.pass.cpp
index 2ca2b8640..87fe6ebbe 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_pod.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_pod.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ public:
     ~Class();
 };
 
-int main()
+int main(int, char**)
 {
     test_is_not_pod<void>();
     test_is_not_pod<int&>();
@@ -62,4 +61,6 @@ int main()
     test_is_pod<const int*>();
     test_is_pod<char[3]>();
     test_is_pod<char[]>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_polymorphic.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_polymorphic.pass.cpp
index 6ce1c0377..8829fea6b 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_polymorphic.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_polymorphic.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ class Final {
 };
 #endif
 
-int main()
+int main(int, char**)
 {
     test_is_not_polymorphic<void>();
     test_is_not_polymorphic<int&>();
@@ -92,4 +91,6 @@ int main()
 
     test_is_polymorphic<NotEmpty>();
     test_is_polymorphic<Abstract>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_signed.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_signed.pass.cpp
index 745efd008..4936cc788 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_signed.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_signed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ public:
 
 struct A; // incomplete
 
-int main()
+int main(int, char**)
 {
     test_is_not_signed<void>();
     test_is_not_signed<int&>();
@@ -72,4 +71,6 @@ int main()
     test_is_signed<__int128_t>();
     test_is_not_signed<__uint128_t>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_standard_layout.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_standard_layout.pass.cpp
index 6e601c1ac..fb096c89a 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_standard_layout.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_standard_layout.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -51,11 +50,13 @@ struct pair
     T2 second;
 };
 
-int main()
+int main(int, char**)
 {
     test_is_standard_layout<int> ();
     test_is_standard_layout<int[3]> ();
     test_is_standard_layout<pair<int, double> > ();
 
     test_is_not_standard_layout<int&> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable.pass.cpp
index b17ca76fd..5768a954d 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ void swap(T&, T&) {}
 
 } // end namespace MyNS2
 
-int main()
+int main(int, char**)
 {
     using namespace MyNS;
     {
@@ -95,4 +94,6 @@ int main()
         static_assert(std::is_swappable_v<int>, "");
         static_assert(!std::is_swappable_v<M>, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_include_order.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_include_order.pass.cpp
index c3ae1706f..5931e7ce7 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_include_order.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_include_order.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     // Use a builtin type so we don't get ADL lookup.
     typedef double T[17][29];
@@ -40,4 +39,6 @@ int main()
        std::iter_swap(t1, t2);
        std::swap_ranges(t1, t1 + 17, t2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp
index a049eab9a..cd65d14ef 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ void swap(M&&, M&&) {}
 
 } // namespace MyNS
 
-int main()
+int main(int, char**)
 {
     using namespace MyNS;
     {
@@ -75,4 +74,6 @@ int main()
         static_assert(std::is_swappable_with_v<int&, int&>, "");
         static_assert(!std::is_swappable_with_v<D&, C&>, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivial.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivial.pass.cpp
index 2d2df14d3..8bb1b7c9b 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivial.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivial.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ public:
     B();
 };
 
-int main()
+int main(int, char**)
 {
     test_is_trivial<int> ();
     test_is_trivial<A> ();
@@ -60,4 +59,6 @@ int main()
     test_is_not_trivial<int&> ();
     test_is_not_trivial<volatile int&> ();
     test_is_not_trivial<B> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_assignable.pass.cpp
index a9b538b2d..124480c07 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,7 +47,7 @@ struct C
     void operator=(C&);  // not const
 };
 
-int main()
+int main(int, char**)
 {
     test_is_trivially_assignable<int&, int&> ();
     test_is_trivially_assignable<int&, int> ();
@@ -59,4 +58,6 @@ int main()
     test_is_not_trivially_assignable<B, A> ();
     test_is_not_trivially_assignable<A, B> ();
     test_is_not_trivially_assignable<C&, C&> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_constructible.pass.cpp
index 212245f00..42d54bd7e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ struct A
     A(int, double);
 };
 
-int main()
+int main(int, char**)
 {
     test_is_trivially_constructible<int> ();
     test_is_trivially_constructible<int, const int&> ();
@@ -74,4 +73,6 @@ int main()
     test_is_not_trivially_constructible<A, int> ();
     test_is_not_trivially_constructible<A, int, double> ();
     test_is_not_trivially_constructible<A> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_assignable.pass.cpp
index 966573c9f..91fbf69f4 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ struct A
     A& operator=(const A&);
 };
 
-int main()
+int main(int, char**)
 {
     test_has_trivially_copy_assignable<int&>();
     test_has_trivially_copy_assignable<Union>();
@@ -77,4 +76,6 @@ int main()
     test_has_not_trivially_copy_assignable<Abstract>();
     test_has_not_trivially_copy_assignable<const Empty>();
 
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_constructible.pass.cpp
index 2922f2276..5744d2ca0 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copy_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ struct A
     A(const A&);
 };
 
-int main()
+int main(int, char**)
 {
     test_has_not_trivial_copy_constructor<void>();
     test_has_not_trivial_copy_constructor<A>();
@@ -81,4 +80,6 @@ int main()
     test_is_trivially_copy_constructible<int*>();
     test_is_trivially_copy_constructible<const int*>();
     test_is_trivially_copy_constructible<bit_zero>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp
index ac4664312..51ac0803e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_copyable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -66,7 +65,7 @@ public:
     C();
 };
 
-int main()
+int main(int, char**)
 {
     test_is_trivially_copyable<int> ();
     test_is_trivially_copyable<const int> ();
@@ -77,4 +76,6 @@ int main()
     test_is_not_trivially_copyable<int&> ();
     test_is_not_trivially_copyable<const A&> ();
     test_is_not_trivially_copyable<B> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_default_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_default_constructible.pass.cpp
index 2d367159c..03ac030a3 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_default_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_default_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,7 @@ struct A
     A();
 };
 
-int main()
+int main(int, char**)
 {
     test_has_not_trivial_default_constructor<void>();
     test_has_not_trivial_default_constructor<int&>();
@@ -86,4 +85,6 @@ int main()
     test_is_trivially_default_constructible<const int*>();
     test_is_trivially_default_constructible<char[3]>();
     test_is_trivially_default_constructible<bit_zero>();
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
index 3372e615d..e79e4926b 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -88,7 +87,7 @@ struct A
     ~A();
 };
 
-int main()
+int main(int, char**)
 {
     test_is_not_trivially_destructible<void>();
     test_is_not_trivially_destructible<A>();
@@ -116,4 +115,6 @@ int main()
     test_is_not_trivially_destructible<PureProtectedDestructor>();
     test_is_not_trivially_destructible<PurePrivateDestructor>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_assignable.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_assignable.pass.cpp
index 9a27c73cd..0a91efdf0 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_assignable.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_assignable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,7 @@ struct A
     A& operator=(const A&);
 };
 
-int main()
+int main(int, char**)
 {
     test_has_trivial_assign<int&>();
     test_has_trivial_assign<Union>();
@@ -77,4 +76,6 @@ int main()
     test_has_not_trivial_assign<Abstract>();
     test_has_not_trivial_assign<const Empty>();
 
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_constructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_constructible.pass.cpp
index 941ff31f8..78c10a132 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_constructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_move_constructible.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -76,7 +75,7 @@ struct MoveOnly2
 
 #endif
 
-int main()
+int main(int, char**)
 {
     test_has_not_trivial_move_constructor<void>();
     test_has_not_trivial_move_constructor<A>();
@@ -95,4 +94,6 @@ int main()
     static_assert(!std::is_trivially_move_constructible<MoveOnly1>::value, "");
     static_assert( std::is_trivially_move_constructible<MoveOnly2>::value, "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_unsigned.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_unsigned.pass.cpp
index 376c7e005..bc70a43b9 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_unsigned.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_unsigned.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -52,7 +51,7 @@ public:
 
 struct A; // incomplete
 
-int main()
+int main(int, char**)
 {
     test_is_not_unsigned<void>();
     test_is_not_unsigned<int&>();
@@ -72,4 +71,6 @@ int main()
     test_is_unsigned<__uint128_t>();
     test_is_not_unsigned<__int128_t>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_volatile.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_volatile.pass.cpp
index cc8d66ae6..cb0fc3c6e 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_volatile.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_volatile.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ void test_is_volatile()
 
 struct A; // incomplete
 
-int main()
+int main(int, char**)
 {
     test_is_volatile<void>();
     test_is_volatile<int>();
@@ -45,4 +44,6 @@ int main()
 
     static_assert(!std::is_volatile<int&>::value, "");
     static_assert(!std::is_volatile<volatile int&>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/meta/meta.unary/nothing_to_do.pass.cpp b/test/std/utilities/meta/meta.unary/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/meta/meta.unary/nothing_to_do.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/nothing_to_do.pass.cpp b/test/std/utilities/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/nothing_to_do.pass.cpp
+++ b/test/std/utilities/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp b/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
index 8a7308348..6f119b274 100644
--- a/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
+++ b/test/std/utilities/optional/optional.bad_optional_access/default.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.7
-// XFAIL: availability=macosx10.8
+// XFAIL: dylib-has-no-bad_optional_access
 
 // <optional>
 
@@ -24,8 +17,10 @@
 #include <optional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     using std::bad_optional_access;
     bad_optional_access ex;
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp b/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
index 930015a73..975d8678b 100644
--- a/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
+++ b/test/std/utilities/optional/optional.bad_optional_access/derive.pass.cpp
@@ -1,21 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
-
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access
 
 // <optional>
 
@@ -24,10 +16,12 @@
 #include <optional>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     using std::bad_optional_access;
 
     static_assert(std::is_base_of<std::exception, bad_optional_access>::value, "");
     static_assert(std::is_convertible<bad_optional_access*, std::exception*>::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.comp_with_t/equal.pass.cpp b/test/std/utilities/optional/optional.comp_with_t/equal.pass.cpp
index dc6973927..4f7aedbcb 100644
--- a/test/std/utilities/optional/optional.comp_with_t/equal.pass.cpp
+++ b/test/std/utilities/optional/optional.comp_with_t/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool operator==(const X& lhs, const X& rhs) {
   return lhs.i_ == rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -61,4 +60,6 @@ int main() {
     static_assert(o1 == 42, "");
     static_assert(!(101 == o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.comp_with_t/greater.pass.cpp b/test/std/utilities/optional/optional.comp_with_t/greater.pass.cpp
index e1bad12e3..373634f68 100644
--- a/test/std/utilities/optional/optional.comp_with_t/greater.pass.cpp
+++ b/test/std/utilities/optional/optional.comp_with_t/greater.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct X {
 
 constexpr bool operator>(const X& lhs, const X& rhs) { return lhs.i_ > rhs.i_; }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -61,4 +60,6 @@ int main() {
     static_assert(o1 > 11, "");
     static_assert(!(42 > o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.comp_with_t/greater_equal.pass.cpp b/test/std/utilities/optional/optional.comp_with_t/greater_equal.pass.cpp
index 342ddffc2..5d4839734 100644
--- a/test/std/utilities/optional/optional.comp_with_t/greater_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.comp_with_t/greater_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool operator>=(const X& lhs, const X& rhs) {
   return lhs.i_ >= rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -63,4 +62,6 @@ int main() {
     static_assert(o1 >= 42, "");
     static_assert(!(11 >= o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.comp_with_t/less_equal.pass.cpp b/test/std/utilities/optional/optional.comp_with_t/less_equal.pass.cpp
index bcf6afcc6..a601939c5 100644
--- a/test/std/utilities/optional/optional.comp_with_t/less_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.comp_with_t/less_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool operator<=(const X& lhs, const X& rhs) {
   return lhs.i_ <= rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -63,4 +62,6 @@ int main() {
     static_assert(o1 <= 42, "");
     static_assert(!(101 <= o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.comp_with_t/less_than.pass.cpp b/test/std/utilities/optional/optional.comp_with_t/less_than.pass.cpp
index 3d5e2144a..732095590 100644
--- a/test/std/utilities/optional/optional.comp_with_t/less_than.pass.cpp
+++ b/test/std/utilities/optional/optional.comp_with_t/less_than.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct X {
 
 constexpr bool operator<(const X& lhs, const X& rhs) { return lhs.i_ < rhs.i_; }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -61,4 +60,6 @@ int main() {
     static_assert(o1 < 101, "");
     static_assert(!(42 < o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.comp_with_t/not_equal.pass.cpp b/test/std/utilities/optional/optional.comp_with_t/not_equal.pass.cpp
index 7da9b7ba7..0d14f1e97 100644
--- a/test/std/utilities/optional/optional.comp_with_t/not_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.comp_with_t/not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool operator!=(const X& lhs, const X& rhs) {
   return lhs.i_ != rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -61,4 +60,6 @@ int main() {
     static_assert(o1 != 101, "");
     static_assert(!(42 != o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.hash/enabled_hash.pass.cpp b/test/std/utilities/optional/optional.hash/enabled_hash.pass.cpp
index e54a4ced8..66ab089dc 100644
--- a/test/std/utilities/optional/optional.hash/enabled_hash.pass.cpp
+++ b/test/std/utilities/optional/optional.hash/enabled_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
   {
 
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.hash/hash.pass.cpp b/test/std/utilities/optional/optional.hash/hash.pass.cpp
index b4a1832cd..aa89a51d8 100644
--- a/test/std/utilities/optional/optional.hash/hash.pass.cpp
+++ b/test/std/utilities/optional/optional.hash/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ struct hash<B> {
 
 }
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     const std::size_t nullopt_hash =
@@ -77,4 +76,6 @@ int main()
       test_hash_enabled_for_type<std::optional<B>>();
       test_hash_enabled_for_type<std::optional<const B>>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullops/equal.pass.cpp b/test/std/utilities/optional/optional.nullops/equal.pass.cpp
index a87a87f87..589446220 100644
--- a/test/std/utilities/optional/optional.nullops/equal.pass.cpp
+++ b/test/std/utilities/optional/optional.nullops/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::nullopt_t;
@@ -36,4 +35,6 @@ int main()
     static_assert (noexcept(nullopt == o1), "");
     static_assert (noexcept(o1 == nullopt), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullops/greater.pass.cpp b/test/std/utilities/optional/optional.nullops/greater.pass.cpp
index 3986a0a92..59dc62fce 100644
--- a/test/std/utilities/optional/optional.nullops/greater.pass.cpp
+++ b/test/std/utilities/optional/optional.nullops/greater.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::nullopt_t;
@@ -36,4 +35,6 @@ int main()
     static_assert (noexcept(nullopt > o1), "");
     static_assert (noexcept(o1 > nullopt), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullops/greater_equal.pass.cpp b/test/std/utilities/optional/optional.nullops/greater_equal.pass.cpp
index 9f2427273..e23e8794f 100644
--- a/test/std/utilities/optional/optional.nullops/greater_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.nullops/greater_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::nullopt_t;
@@ -36,4 +35,6 @@ int main()
     static_assert (noexcept(nullopt >= o1), "");
     static_assert (noexcept(o1 >= nullopt), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullops/less_equal.pass.cpp b/test/std/utilities/optional/optional.nullops/less_equal.pass.cpp
index 8e73247b9..96f0754e4 100644
--- a/test/std/utilities/optional/optional.nullops/less_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.nullops/less_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::nullopt_t;
@@ -37,4 +36,6 @@ int main()
     static_assert (noexcept(nullopt <= o1), "");
     static_assert (noexcept(o1 <= nullopt), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullops/less_than.pass.cpp b/test/std/utilities/optional/optional.nullops/less_than.pass.cpp
index 39a8e4a39..872f3159a 100644
--- a/test/std/utilities/optional/optional.nullops/less_than.pass.cpp
+++ b/test/std/utilities/optional/optional.nullops/less_than.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::nullopt_t;
@@ -36,4 +35,6 @@ int main()
     static_assert (noexcept(nullopt < o1), "");
     static_assert (noexcept(o1 < nullopt), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullops/not_equal.pass.cpp b/test/std/utilities/optional/optional.nullops/not_equal.pass.cpp
index 1c96dd42e..7eea0fa88 100644
--- a/test/std/utilities/optional/optional.nullops/not_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.nullops/not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::nullopt_t;
@@ -36,4 +35,6 @@ int main()
     static_assert (noexcept(nullopt != o1), "");
     static_assert (noexcept(o1 != nullopt), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullopt/nullopt_t.fail.cpp b/test/std/utilities/optional/optional.nullopt/nullopt_t.fail.cpp
index c97bebe29..2a7822ebb 100644
--- a/test/std/utilities/optional/optional.nullopt/nullopt_t.fail.cpp
+++ b/test/std/utilities/optional/optional.nullopt/nullopt_t.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     std::nullopt_t n = {};
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp b/test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp
index 247fce58f..c9d843e9c 100644
--- a/test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp
+++ b/test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,11 +29,13 @@ constexpr bool test()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     static_assert(std::is_empty_v<nullopt_t>);
     static_assert(!std::is_default_constructible_v<nullopt_t>);
 
     static_assert(std::is_same_v<const nullopt_t, decltype(nullopt)>);
     static_assert(test());
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/assign_value.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/assign_value.pass.cpp
index 0fcc52be1..8d2a8a00c 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/assign_value.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/assign_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -242,7 +241,7 @@ enum MyEnum { Zero, One, Two, Three, FortyTwo = 42 };
 
 using Fn = void(*)();
 
-int main()
+int main(int, char**)
 {
     test_sfinae();
     // Test with instrumented type
@@ -269,4 +268,6 @@ int main()
         assert(**opt == 3);
     }
     test_throws();
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/const_optional_U.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/const_optional_U.pass.cpp
index d471c053c..6ccaafa6d 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/const_optional_U.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/const_optional_U.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -197,7 +196,7 @@ void test_ambigious_assign() {
 }
 
 
-int main()
+int main(int, char**)
 {
     test_with_test_type();
     test_ambigious_assign();
@@ -251,4 +250,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp
index 98c90aa1d..5900e6046 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp
@@ -1,16 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // <optional>
 
-// optional<T>& operator=(const optional<T>& rhs);
+// optional<T>& operator=(const optional<T>& rhs); // constexpr in C++20
 
 #include <optional>
 #include <type_traits>
@@ -49,19 +48,23 @@ constexpr bool assign_value(optional<Tp>&& lhs) {
     return lhs.has_value() && rhs.has_value() && *lhs == *rhs;
 }
 
-int main()
+int main(int, char**)
 {
     {
         using O = optional<int>;
+#if TEST_STD_VER > 17
         LIBCPP_STATIC_ASSERT(assign_empty(O{42}), "");
         LIBCPP_STATIC_ASSERT(assign_value(O{42}), "");
+#endif
         assert(assign_empty(O{42}));
         assert(assign_value(O{42}));
     }
     {
         using O = optional<TrivialTestTypes::TestType>;
+#if TEST_STD_VER > 17
         LIBCPP_STATIC_ASSERT(assign_empty(O{42}), "");
         LIBCPP_STATIC_ASSERT(assign_value(O{42}), "");
+#endif
         assert(assign_empty(O{42}));
         assert(assign_value(O{42}));
     }
@@ -99,4 +102,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
index e7f59f1a9..c5cebc542 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -209,7 +208,7 @@ void test_on_test_type() {
 
 
 
-int main()
+int main(int, char**)
 {
     {
         test_on_test_type<TestTypes::TestType>();
@@ -266,4 +265,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp
index f6959c7e9..446e9ae96 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -70,7 +69,7 @@ public:
 
 bool Z::dtor_called = false;
 
-int main()
+int main(int, char**)
 {
     {
         X x;
@@ -118,4 +117,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/move.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/move.pass.cpp
index ed8b433da..c862c5f0e 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/move.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,11 +11,12 @@
 
 // optional<T>& operator=(optional<T>&& rhs)
 //     noexcept(is_nothrow_move_assignable<T>::value &&
-//              is_nothrow_move_constructible<T>::value);
+//              is_nothrow_move_constructible<T>::value); // constexpr in C++20
 
 #include <optional>
-#include <type_traits>
 #include <cassert>
+#include <type_traits>
+#include <utility>
 
 #include "test_macros.h"
 #include "archetypes.hpp"
@@ -51,7 +51,22 @@ struct Y {};
 bool X::throw_now = false;
 int X::alive = 0;
 
-int main()
+
+template <class Tp>
+constexpr bool assign_empty(optional<Tp>&& lhs) {
+    optional<Tp> rhs;
+    lhs = std::move(rhs);
+    return !lhs.has_value() && !rhs.has_value();
+}
+
+template <class Tp>
+constexpr bool assign_value(optional<Tp>&& lhs) {
+    optional<Tp> rhs(101);
+    lhs = std::move(rhs);
+    return lhs.has_value() && rhs.has_value() && *lhs == Tp{101};
+}
+
+int main(int, char**)
 {
     {
         static_assert(std::is_nothrow_move_assignable<optional<int>>::value, "");
@@ -97,6 +112,24 @@ int main()
         assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
         assert(*opt == *opt2);
     }
+    {
+        using O = optional<int>;
+#if TEST_STD_VER > 17
+        LIBCPP_STATIC_ASSERT(assign_empty(O{42}), "");
+        LIBCPP_STATIC_ASSERT(assign_value(O{42}), "");
+#endif
+        assert(assign_empty(O{42}));
+        assert(assign_value(O{42}));
+    }
+    {
+        using O = optional<TrivialTestTypes::TestType>;
+#if TEST_STD_VER > 17
+        LIBCPP_STATIC_ASSERT(assign_empty(O{42}), "");
+        LIBCPP_STATIC_ASSERT(assign_value(O{42}), "");
+#endif
+        assert(assign_empty(O{42}));
+        assert(assign_value(O{42}));
+    }
 #ifndef TEST_HAS_NO_EXCEPTIONS
     {
         static_assert(!std::is_nothrow_move_assignable<optional<X>>::value, "");
@@ -171,4 +204,5 @@ int main()
         };
         static_assert(std::is_nothrow_move_assignable<optional<NoThrowMove>>::value, "");
     }
+    return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/nullopt_t.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/nullopt_t.pass.cpp
index 991f43343..af582d732 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/nullopt_t.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/nullopt_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@ using std::optional;
 using std::nullopt_t;
 using std::nullopt;
 
-int main()
+int main(int, char**)
 {
     {
         optional<int> opt;
@@ -64,4 +63,6 @@ int main()
     assert(TT::alive == 0);
     assert(TT::destroyed == 1);
     TT::reset();
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/optional_U.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/optional_U.pass.cpp
index db7fc19bf..cabaa070b 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/optional_U.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/optional_U.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -202,7 +201,7 @@ void test_ambigious_assign() {
 }
 
 
-int main()
+int main(int, char**)
 {
     test_with_test_type();
     test_ambigious_assign();
@@ -265,4 +264,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
index f1e9a1cfd..b5966dfa5 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // <optional>
 
@@ -154,7 +147,9 @@ void test_explicit() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
     test_implicit();
     test_explicit();
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
index ee0dcfd77..f20a840b0 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // <optional>
 
@@ -30,7 +23,7 @@
 
 using std::optional;
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -133,4 +126,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/const_optional_U.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/const_optional_U.pass.cpp
index e12f6cb28..b28d22330 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/const_optional_U.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/const_optional_U.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -79,7 +78,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef short U;
@@ -131,4 +130,6 @@ int main()
     }
 
     static_assert(!(std::is_constructible<optional<X>, const optional<Y>&>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/copy.fail.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/copy.fail.cpp
deleted file mode 100644
index 593368348..000000000
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/copy.fail.cpp
+++ /dev/null
@@ -1,36 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03, c++11, c++14
-// <optional>
-
-// constexpr optional(const optional<T>& rhs);
-//   If is_trivially_copy_constructible_v<T> is true,
-//    this constructor shall be a constexpr constructor.
-
-#include <optional>
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-
-struct S {
-    constexpr S()   : v_(0) {}
-    S(int v)        : v_(v) {}
-    S(const S &rhs) : v_(rhs.v_) {}  // make it not trivially copyable
-    int v_;
-};
-
-
-int main()
-{
-    static_assert (!std::is_trivially_copy_constructible_v<S>, "" );
-    constexpr std::optional<S> o1;
-    constexpr std::optional<S> o2 = o1;  // not constexpr
-}
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp
index 31e7f9fdb..e6793cd47 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -114,7 +113,7 @@ void test_reference_extension()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<int>();
     test<int>(3);
@@ -170,4 +169,6 @@ int main()
         constexpr std::optional<int> o2 = o1;
         static_assert( *o2 == 4, "" );
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp
index 1e1e82b03..7c6ae9bcd 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
 
@@ -43,4 +42,6 @@ int main()
 //  optional(nullopt_t)
     std::optional opt(std::nullopt);   // expected-error-re@optional:* {{static_assert failed{{.*}} "instantiation of optional with nullopt_t is ill-formed"}}
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp
index 6ce35a489..fa2edfcdd 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
 //  Test the explicit deduction guides
     {
@@ -51,4 +50,6 @@ int main()
     assert(static_cast<bool>(opt) == static_cast<bool>(source));
     assert(*opt == *source);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/default.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/default.pass.cpp
index 62795b91f..3dd38da9d 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/default.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ test()
     };
 }
 
-int main()
+int main(int, char**)
 {
     test_constexpr<optional<int>>();
     test_constexpr<optional<int*>>();
@@ -78,4 +77,6 @@ int main()
     test_constexpr<optional<NonLiteralTypes::NoCtors&>>();
     test_constexpr<optional<NonLiteralTypes::NoCtors&&>>();
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_const_optional_U.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_const_optional_U.pass.cpp
index 64ac05316..7741e0353 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_const_optional_U.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_const_optional_U.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -80,7 +79,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef X T;
@@ -118,4 +117,6 @@ int main()
         optional<U> rhs(3);
         test<T>(rhs, true);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_optional_U.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_optional_U.pass.cpp
index 2c6757a95..71febba35 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_optional_U.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_optional_U.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ public:
     explicit Z(int) { TEST_THROW(6); }
 };
 
-int main()
+int main(int, char**)
 {
     {
         optional<int> rhs;
@@ -81,4 +80,6 @@ int main()
         optional<int> rhs(3);
         test<Z>(std::move(rhs), true);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/in_place_t.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/in_place_t.pass.cpp
index d0823d2c8..db995b4a7 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/in_place_t.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/in_place_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -59,7 +58,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         constexpr optional<int> opt(in_place, 5);
@@ -145,4 +144,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/initializer_list.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/initializer_list.pass.cpp
index 6d9f45a97..c8c76df25 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/initializer_list.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -67,7 +66,7 @@ public:
         {return x.i_ == y.i_ && x.j_ == y.j_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         static_assert(!std::is_constructible<X, std::initializer_list<int>&>::value, "");
@@ -113,4 +112,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/move.fail.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/move.fail.cpp
index 4e3991c18..a8634b961 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/move.fail.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/move.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,9 +28,11 @@ struct S {
     };
 
 
-int main()
+int main(int, char**)
 {
     static_assert (!std::is_trivially_move_constructible_v<S>, "" );
     constexpr std::optional<S> o1;
     constexpr std::optional<S> o2 = std::move(o1);  // not constexpr
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
index cb084ecd9..4c58d45b5 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // <optional>
 
@@ -152,7 +145,7 @@ void test_reference_extension()
 }
 
 
-int main()
+int main(int, char**)
 {
     test<int>();
     test<int>(3);
@@ -226,4 +219,6 @@ int main()
     constexpr std::optional<int> o2 = std::move(o1);
     static_assert( *o2 == 4, "" );
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/nullopt_t.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/nullopt_t.pass.cpp
index 468a00346..927ac19ea 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/nullopt_t.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/nullopt_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ test()
     };
 }
 
-int main()
+int main(int, char**)
 {
     test_constexpr<optional<int>>();
     test_constexpr<optional<int*>>();
@@ -70,4 +69,6 @@ int main()
     test_constexpr<optional<NonTrivialTypes::NoCtors>>();
     test_constexpr<optional<NonConstexprTypes::NoCtors>>();
     test<optional<NonLiteralTypes::NoCtors>>();
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/optional_U.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/optional_U.pass.cpp
index 0e180c14e..fe4252b49 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/optional_U.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/optional_U.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ struct Z
     Z(int) { TEST_THROW(6); }
 };
 
-int main()
+int main(int, char**)
 {
     {
         optional<short> rhs;
@@ -90,4 +89,6 @@ int main()
     }
 
     static_assert(!(std::is_constructible<optional<X>, optional<Z>>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
index f8a98508a..f2e7882e8 100644
--- a/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // <optional>
 
@@ -40,7 +33,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -158,4 +151,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp
index 5132c9a73..23497bc4c 100644
--- a/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.dtor/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ public:
 
 bool X::dtor_called = false;
 
-int main()
+int main(int, char**)
 {
     {
         typedef int T;
@@ -65,4 +64,6 @@ int main()
         }
         assert(X::dtor_called == true);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp
index 8fcd18608..704606c6f 100644
--- a/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.mod/reset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct X
 
 bool X::dtor_called = false;
 
-int main()
+int main(int, char**)
 {
     {
         optional<int> opt;
@@ -56,4 +55,6 @@ int main()
         assert(static_cast<bool>(opt) == false);
         X::dtor_called = false;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/bool.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/bool.pass.cpp
index 9820d50f6..7c008ef62 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/bool.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     {
@@ -34,4 +33,6 @@ int main()
         constexpr optional<int> opt(0);
         static_assert(opt, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/dereference.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/dereference.pass.cpp
index 4087cfdf1..368f84155 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/dereference.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/dereference.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test()
     return (*opt).test();
 }
 
-int main()
+int main(int, char**)
 {
     {
         optional<X> opt; ((void)opt);
@@ -70,4 +69,6 @@ int main()
         assert(false);
     }
 #endif  // _LIBCPP_DEBUG
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const.pass.cpp
index 0779c9047..99a60e8dd 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct Y
     int test() const {return 2;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const optional<X> opt; ((void)opt);
@@ -66,4 +65,6 @@ int main()
         assert(false);
     }
 #endif  // _LIBCPP_DEBUG
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const_rvalue.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const_rvalue.pass.cpp
index 78fd99295..ca494c5a8 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const_rvalue.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/dereference_const_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct Y
     int test() const && {return 2;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const optional<X> opt; ((void)opt);
@@ -66,4 +65,6 @@ int main()
         assert(false);
     }
 #endif  // _LIBCPP_DEBUG
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/dereference_rvalue.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/dereference_rvalue.pass.cpp
index 292412323..f1b2ca393 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/dereference_rvalue.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/dereference_rvalue.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ test()
     return (*std::move(opt)).test();
 }
 
-int main()
+int main(int, char**)
 {
     {
         optional<X> opt; ((void)opt);
@@ -70,4 +69,6 @@ int main()
         assert(false);
     }
 #endif  // _LIBCPP_DEBUG
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/has_value.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/has_value.pass.cpp
index 5df295d01..560fa8894 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/has_value.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/has_value.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     {
@@ -34,4 +33,6 @@ int main()
         constexpr optional<int> opt(0);
         static_assert(opt.has_value(), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp
index 2f1648c48..8c6c09861 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ test()
     return opt->test();
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::optional<X> opt; ((void)opt);
@@ -69,4 +68,6 @@ int main()
         assert(false);
     }
 #endif  // _LIBCPP_DEBUG
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow_const.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow_const.pass.cpp
index 887edc711..b9539828a 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow_const.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct Z
     constexpr int test() const {return 1;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const std::optional<X> opt; ((void)opt);
@@ -73,4 +72,6 @@ int main()
         assert(false);
     }
 #endif  // _LIBCPP_DEBUG
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
index f25bf71da..a37d0f34e 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // <optional>
 
@@ -53,7 +46,7 @@ test()
 }
 
 
-int main()
+int main(int, char**)
 {
     {
         optional<X> opt; ((void)opt);
@@ -79,4 +72,6 @@ int main()
     }
 #endif
     static_assert(test() == 7, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value_const.fail.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value_const.fail.cpp
index 6076c509f..5e81f2fb1 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/value_const.fail.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value_const.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,10 +23,12 @@ struct X
     int test() {return 4;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         constexpr optional<X> opt;
         static_assert(opt.value().test() == 3, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
index 00f934d6a..4533208d6 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value_const.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // <optional>
 
@@ -42,7 +35,7 @@ struct X
     int test() && {return 6;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const optional<X> opt; ((void)opt);
@@ -70,4 +63,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
index 90e8fb456..9719a1ebd 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value_const_rvalue.pass.cpp
@@ -1,21 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // <optional>
 
@@ -42,7 +35,7 @@ struct X
     int test() && {return 6;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         const optional<X> opt; ((void)opt);
@@ -70,4 +63,6 @@ int main()
         }
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value_or.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value_or.pass.cpp
index f94dcabde..8f22f1c0d 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/value_or.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value_or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -68,7 +67,9 @@ constexpr int test()
     return 0;
 }
 
-int main()
+int main(int, char**)
 {
     static_assert(test() == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value_or_const.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value_or_const.pass.cpp
index 36a85811b..736fe791a 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/value_or_const.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value_or_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ struct X
         {return x.i_ == y.i_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         constexpr optional<X> opt(2);
@@ -74,4 +73,6 @@ int main()
         const optional<X> opt;
         assert(opt.value_or(Y(3)) == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
index a63e3be8e..215db7f1b 100644
--- a/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value_rvalue.pass.cpp
@@ -1,22 +1,15 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // <optional>
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
 // constexpr T& optional<T>::value() &&;
 
@@ -51,7 +44,7 @@ test()
     return std::move(opt).value().test();
 }
 
-int main()
+int main(int, char**)
 {
     {
         optional<X> opt; ((void)opt);
@@ -77,4 +70,6 @@ int main()
     }
 #endif
     static_assert(test() == 7, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional.object.swap/swap.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.swap/swap.pass.cpp
index 26041259f..e881a0c62 100644
--- a/test/std/utilities/optional/optional.object/optional.object.swap/swap.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.swap/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ public:
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         optional<int> opt1;
@@ -303,4 +302,6 @@ int main()
         assert(*opt2 == 2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/optional_requires_destructible_object.fail.cpp b/test/std/utilities/optional/optional.object/optional_requires_destructible_object.fail.cpp
index 11ddcb7c0..531173ade 100644
--- a/test/std/utilities/optional/optional.object/optional_requires_destructible_object.fail.cpp
+++ b/test/std/utilities/optional/optional.object/optional_requires_destructible_object.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ private:
     ~X() {}
 };
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     {
@@ -47,4 +46,6 @@ int main()
     }
     // FIXME these are garbage diagnostics that Clang should not produce
     // expected-error@optional:* 0+ {{is not a base class}}
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.object/special_members.pass.cpp b/test/std/utilities/optional/optional.object/special_members.pass.cpp
new file mode 100644
index 000000000..28783264d
--- /dev/null
+++ b/test/std/utilities/optional/optional.object/special_members.pass.cpp
@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14
+
+// <optional>
+
+// Make sure we properly generate special member functions for optional<T>
+// based on the properties of T itself.
+
+#include <optional>
+#include <type_traits>
+
+#include "archetypes.hpp"
+
+
+template <class T>
+struct SpecialMemberTest {
+    using O = std::optional<T>;
+
+    static_assert(std::is_default_constructible_v<O>,
+        "optional is always default constructible.");
+
+    static_assert(std::is_copy_constructible_v<O> == std::is_copy_constructible_v<T>,
+        "optional<T> is copy constructible if and only if T is copy constructible.");
+
+    static_assert(std::is_move_constructible_v<O> ==
+        (std::is_copy_constructible_v<T> || std::is_move_constructible_v<T>),
+        "optional<T> is move constructible if and only if T is copy or move constructible.");
+
+    static_assert(std::is_copy_assignable_v<O> ==
+        (std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>),
+        "optional<T> is copy assignable if and only if T is both copy "
+        "constructible and copy assignable.");
+
+    static_assert(std::is_move_assignable_v<O> ==
+        ((std::is_move_constructible_v<T> && std::is_move_assignable_v<T>) ||
+         (std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>)),
+        "optional<T> is move assignable if and only if T is both move constructible and "
+        "move assignable, or both copy constructible and copy assignable.");
+};
+
+template <class ...Args> static void sink(Args&&...) {}
+
+template <class ...TestTypes>
+struct DoTestsMetafunction {
+    DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
+};
+
+int main(int, char**) {
+    sink(
+        ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
+        ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
+        NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
+        NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{}
+    );
+    return 0;
+}
diff --git a/test/std/utilities/optional/optional.object/triviality.pass.cpp b/test/std/utilities/optional/optional.object/triviality.pass.cpp
new file mode 100644
index 000000000..f53d86000
--- /dev/null
+++ b/test/std/utilities/optional/optional.object/triviality.pass.cpp
@@ -0,0 +1,97 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <optional>
+
+// The following special member functions should propagate the triviality of
+// the element held in the optional (see P0602R4):
+//
+// constexpr optional(const optional& rhs);
+// constexpr optional(optional&& rhs) noexcept(see below);
+// constexpr optional<T>& operator=(const optional& rhs);
+// constexpr optional<T>& operator=(optional&& rhs) noexcept(see below);
+
+
+#include <optional>
+#include <type_traits>
+
+#include "archetypes.hpp"
+
+
+constexpr bool implies(bool p, bool q) {
+    return !p || q;
+}
+
+template <class T>
+struct SpecialMemberTest {
+    using O = std::optional<T>;
+
+    static_assert(implies(std::is_trivially_copy_constructible_v<T>,
+                          std::is_trivially_copy_constructible_v<O>),
+        "optional<T> is trivially copy constructible if T is trivially copy constructible.");
+
+    static_assert(implies(std::is_trivially_move_constructible_v<T>,
+                          std::is_trivially_move_constructible_v<O>),
+        "optional<T> is trivially move constructible if T is trivially move constructible");
+
+    static_assert(implies(std::is_trivially_copy_constructible_v<T> &&
+                          std::is_trivially_copy_assignable_v<T> &&
+                          std::is_trivially_destructible_v<T>,
+
+                          std::is_trivially_copy_assignable_v<O>),
+        "optional<T> is trivially copy assignable if T is "
+        "trivially copy constructible, "
+        "trivially copy assignable, and "
+        "trivially destructible");
+
+    static_assert(implies(std::is_trivially_move_constructible_v<T> &&
+                          std::is_trivially_move_assignable_v<T> &&
+                          std::is_trivially_destructible_v<T>,
+
+                          std::is_trivially_move_assignable_v<O>),
+        "optional<T> is trivially move assignable if T is "
+        "trivially move constructible, "
+        "trivially move assignable, and"
+        "trivially destructible.");
+};
+
+template <class ...Args> static void sink(Args&&...) {}
+
+template <class ...TestTypes>
+struct DoTestsMetafunction {
+    DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
+};
+
+struct TrivialMoveNonTrivialCopy {
+    TrivialMoveNonTrivialCopy() = default;
+    TrivialMoveNonTrivialCopy(const TrivialMoveNonTrivialCopy&) {}
+    TrivialMoveNonTrivialCopy(TrivialMoveNonTrivialCopy&&) = default;
+    TrivialMoveNonTrivialCopy& operator=(const TrivialMoveNonTrivialCopy&) { return *this; }
+    TrivialMoveNonTrivialCopy& operator=(TrivialMoveNonTrivialCopy&&) = default;
+};
+
+struct TrivialCopyNonTrivialMove {
+    TrivialCopyNonTrivialMove() = default;
+    TrivialCopyNonTrivialMove(const TrivialCopyNonTrivialMove&) = default;
+    TrivialCopyNonTrivialMove(TrivialCopyNonTrivialMove&&) {}
+    TrivialCopyNonTrivialMove& operator=(const TrivialCopyNonTrivialMove&) = default;
+    TrivialCopyNonTrivialMove& operator=(TrivialCopyNonTrivialMove&&) { return *this; }
+};
+
+int main(int, char**) {
+    sink(
+        ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
+        ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
+        NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
+        NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
+        DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
+    );
+    return 0;
+}
diff --git a/test/std/utilities/optional/optional.object/types.pass.cpp b/test/std/utilities/optional/optional.object/types.pass.cpp
index 0230a13dd..7c32d1857 100644
--- a/test/std/utilities/optional/optional.object/types.pass.cpp
+++ b/test/std/utilities/optional/optional.object/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,10 +28,12 @@ test()
     static_assert(std::is_same<typename Opt::value_type, T>::value, "");
 }
 
-int main()
+int main(int, char**)
 {
     test<optional<int>, int>();
     test<optional<const int>, const int>();
     test<optional<double>, double>();
     test<optional<const double>, const double>();
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.relops/equal.pass.cpp b/test/std/utilities/optional/optional.relops/equal.pass.cpp
index 0752841d3..4fc85157a 100644
--- a/test/std/utilities/optional/optional.relops/equal.pass.cpp
+++ b/test/std/utilities/optional/optional.relops/equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool operator==(const X& lhs, const X& rhs) {
   return lhs.i_ == rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -83,4 +82,6 @@ int main() {
     static_assert(o1 == O2(42), "");
     static_assert(!(O2(101) == o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.relops/greater_equal.pass.cpp b/test/std/utilities/optional/optional.relops/greater_equal.pass.cpp
index f475f3796..4bc9720aa 100644
--- a/test/std/utilities/optional/optional.relops/greater_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.relops/greater_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ constexpr bool operator>=(const X& lhs, const X& rhs) {
   return lhs.i_ >= rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef optional<X> O;
 
@@ -80,4 +79,6 @@ int main() {
     static_assert(o1 >= O2(42), "");
     static_assert(!(O2(1) >= o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.relops/greater_than.pass.cpp b/test/std/utilities/optional/optional.relops/greater_than.pass.cpp
index c3f2af932..d168cd706 100644
--- a/test/std/utilities/optional/optional.relops/greater_than.pass.cpp
+++ b/test/std/utilities/optional/optional.relops/greater_than.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ struct X {
 
 constexpr bool operator>(const X& lhs, const X& rhs) { return lhs.i_ > rhs.i_; }
 
-int main() {
+int main(int, char**) {
   {
     typedef optional<X> O;
 
@@ -78,4 +77,6 @@ int main() {
     static_assert(o1 > O2(1), "");
     static_assert(!(O2(42) > o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.relops/less_equal.pass.cpp b/test/std/utilities/optional/optional.relops/less_equal.pass.cpp
index 35e80d3d4..835be64f8 100644
--- a/test/std/utilities/optional/optional.relops/less_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.relops/less_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ constexpr bool operator<=(const X& lhs, const X& rhs) {
   return lhs.i_ <= rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef optional<X> O;
 
@@ -80,4 +79,6 @@ int main() {
     static_assert(o1 <= O2(42), "");
     static_assert(!(O2(101) <= o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.relops/less_than.pass.cpp b/test/std/utilities/optional/optional.relops/less_than.pass.cpp
index 1dbffbd92..832de4b29 100644
--- a/test/std/utilities/optional/optional.relops/less_than.pass.cpp
+++ b/test/std/utilities/optional/optional.relops/less_than.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@ struct X {
 
 constexpr bool operator<(const X& lhs, const X& rhs) { return lhs.i_ < rhs.i_; }
 
-int main() {
+int main(int, char**) {
   {
     typedef optional<X> O;
 
@@ -78,4 +77,6 @@ int main() {
     static_assert(o1 < O2(101), "");
     static_assert(!(O2(101) < o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.relops/not_equal.pass.cpp b/test/std/utilities/optional/optional.relops/not_equal.pass.cpp
index 12d9922a9..ab00b7aab 100644
--- a/test/std/utilities/optional/optional.relops/not_equal.pass.cpp
+++ b/test/std/utilities/optional/optional.relops/not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool operator!=(const X& lhs, const X& rhs) {
   return lhs.i_ != rhs.i_;
 }
 
-int main() {
+int main(int, char**) {
   {
     typedef X T;
     typedef optional<T> O;
@@ -83,4 +82,6 @@ int main() {
     static_assert(o1 != O2(101), "");
     static_assert(!(O2(42) != o1), "");
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp b/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
index 421480aa8..f93913e5b 100644
--- a/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
+++ b/test/std/utilities/optional/optional.specalg/make_optional.pass.cpp
@@ -1,23 +1,16 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
-// <optional>
-
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_optional_access && !libcpp-no-exceptions
 
+// <optional>
+//
 // template <class T>
 //   constexpr optional<decay_t<T>> make_optional(T&& v);
 
@@ -28,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::make_optional;
@@ -56,4 +49,6 @@ int main()
         assert(**opt == 3);
         assert(s == nullptr);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.specalg/make_optional_explicit.pass.cpp b/test/std/utilities/optional/optional.specalg/make_optional_explicit.pass.cpp
index bdfeefbcc..d3461542b 100644
--- a/test/std/utilities/optional/optional.specalg/make_optional_explicit.pass.cpp
+++ b/test/std/utilities/optional/optional.specalg/make_optional_explicit.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::make_optional;
@@ -42,4 +41,6 @@ int main()
         auto opt = make_optional<std::string>(4, 'X');
         assert(*opt == "XXXX");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.specalg/make_optional_explicit_initializer_list.pass.cpp b/test/std/utilities/optional/optional.specalg/make_optional_explicit_initializer_list.pass.cpp
index e6ed0129d..40b20bed5 100644
--- a/test/std/utilities/optional/optional.specalg/make_optional_explicit_initializer_list.pass.cpp
+++ b/test/std/utilities/optional/optional.specalg/make_optional_explicit_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct TestT {
       : x(*il.begin()), size(static_cast<int>(il.size())) {}
 };
 
-int main()
+int main(int, char**)
 {
     using std::make_optional;
     {
@@ -50,4 +49,6 @@ int main()
         auto opt = make_optional<std::string>({'a', 'b', 'c'}, std::allocator<char>{});
         assert(*opt == "abc");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.specalg/swap.pass.cpp b/test/std/utilities/optional/optional.specalg/swap.pass.cpp
index 31779243e..1a548e8cc 100644
--- a/test/std/utilities/optional/optional.specalg/swap.pass.cpp
+++ b/test/std/utilities/optional/optional.specalg/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -110,7 +109,7 @@ void test_swap_sfinae() {
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_swap_sfinae();
     {
@@ -349,4 +348,6 @@ int main()
         assert(*opt2 == 2);
     }
 #endif // TEST_HAS_NO_EXCEPTIONS
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.syn/optional_in_place_t.fail.cpp b/test/std/utilities/optional/optional.syn/optional_in_place_t.fail.cpp
index 20c90c7e3..b7d3b71e0 100644
--- a/test/std/utilities/optional/optional.syn/optional_in_place_t.fail.cpp
+++ b/test/std/utilities/optional/optional.syn/optional_in_place_t.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::in_place_t;
@@ -23,4 +22,6 @@ int main()
 
     optional<in_place_t> opt; // expected-note {{requested here}}
     // expected-error@optional:* {{"instantiation of optional with in_place_t is ill-formed"}}
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.syn/optional_includes_initializer_list.pass.cpp b/test/std/utilities/optional/optional.syn/optional_includes_initializer_list.pass.cpp
index 57903020f..daaad5664 100644
--- a/test/std/utilities/optional/optional.syn/optional_includes_initializer_list.pass.cpp
+++ b/test/std/utilities/optional/optional.syn/optional_includes_initializer_list.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,10 +13,12 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
 
     std::initializer_list<int> list;
     (void)list;
+
+  return 0;
 }
diff --git a/test/std/utilities/optional/optional.syn/optional_nullopt_t.fail.cpp b/test/std/utilities/optional/optional.syn/optional_nullopt_t.fail.cpp
index 56a30ccb0..a4abbf027 100644
--- a/test/std/utilities/optional/optional.syn/optional_nullopt_t.fail.cpp
+++ b/test/std/utilities/optional/optional.syn/optional_nullopt_t.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <optional>
 
-int main()
+int main(int, char**)
 {
     using std::optional;
     using std::nullopt_t;
@@ -26,4 +25,6 @@ int main()
     optional<nullopt_t &> opt2; // expected-note 1 {{requested here}}
     optional<nullopt_t &&> opt3; // expected-note 1 {{requested here}}
     // expected-error@optional:* 4 {{instantiation of optional with nullopt_t is ill-formed}}
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_add.fail.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_add.fail.cpp
index e4ced3213..abf75631f 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_add.fail.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_add.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,9 +10,11 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     typedef std::ratio<0x7FFFFFFFFFFFFFFFLL, 1> R1;
     typedef std::ratio<1, 1> R2;
     typedef std::ratio_add<R1, R2>::type R;
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_add.pass.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_add.pass.cpp
index a537f0215..c62f75a0d 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_add.pass.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_add.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,7 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -73,4 +72,6 @@ int main()
     typedef std::ratio_add<R1, R2>::type R;
     static_assert(R::num == 1 && R::den == 1, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.fail.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.fail.cpp
index bdbcda36f..387f62903 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.fail.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,9 +10,11 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     typedef std::ratio<0x7FFFFFFFFFFFFFFFLL, 1> R1;
     typedef std::ratio<1, 2> R2;
     typedef std::ratio_divide<R1, R2>::type R;
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.pass.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.pass.cpp
index 49b55e7a6..ce7f69473 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.pass.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_divide.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,7 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -55,4 +54,6 @@ int main()
     typedef std::ratio_divide<R1, R2>::type R;
     static_assert(R::num == 630992477165LL && R::den == 127339199162436LL, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.fail.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.fail.cpp
index 81acc14be..ef59bb39e 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.fail.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,9 +10,11 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     typedef std::ratio<0x7FFFFFFFFFFFFFFFLL, 1> R1;
     typedef std::ratio<2, 1> R2;
     typedef std::ratio_multiply<R1, R2>::type R;
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.pass.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.pass.cpp
index ccf15e07a..e20f23443 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.pass.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_multiply.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,7 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -55,4 +54,6 @@ int main()
     typedef std::ratio_multiply<R1, R2>::type R;
     static_assert(R::num == 15519594064236LL && R::den == 5177331081415LL, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.fail.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.fail.cpp
index b88314388..8b00462dc 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.fail.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,9 +10,11 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     typedef std::ratio<-0x7FFFFFFFFFFFFFFFLL, 1> R1;
     typedef std::ratio<1, 1> R2;
     typedef std::ratio_subtract<R1, R2>::type R;
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.pass.cpp b/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.pass.cpp
index 33efd90f5..e3871f7a7 100644
--- a/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.pass.cpp
+++ b/test/std/utilities/ratio/ratio.arithmetic/ratio_subtract.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,7 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -73,4 +72,6 @@ int main()
     typedef std::ratio_subtract<R1, R2>::type R;
     static_assert(R::num == -1 && R::den == 1, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.comparison/ratio_equal.pass.cpp b/test/std/utilities/ratio/ratio.comparison/ratio_equal.pass.cpp
index 9331b7094..d0b1d5a17 100644
--- a/test/std/utilities/ratio/ratio.comparison/ratio_equal.pass.cpp
+++ b/test/std/utilities/ratio/ratio.comparison/ratio_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -64,4 +63,6 @@ int main()
     typedef std::ratio<1, -0x7FFFFFFFFFFFFFFFLL> R2;
     test<R1, R2, false>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.comparison/ratio_greater.pass.cpp b/test/std/utilities/ratio/ratio.comparison/ratio_greater.pass.cpp
index 7f7a74068..dfb0e8fe8 100644
--- a/test/std/utilities/ratio/ratio.comparison/ratio_greater.pass.cpp
+++ b/test/std/utilities/ratio/ratio.comparison/ratio_greater.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -64,4 +63,6 @@ int main()
     typedef std::ratio<1, -0x7FFFFFFFFFFFFFFFLL> R2;
     test<R1, R2, true>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.comparison/ratio_greater_equal.pass.cpp b/test/std/utilities/ratio/ratio.comparison/ratio_greater_equal.pass.cpp
index db78557ec..811706c58 100644
--- a/test/std/utilities/ratio/ratio.comparison/ratio_greater_equal.pass.cpp
+++ b/test/std/utilities/ratio/ratio.comparison/ratio_greater_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -64,4 +63,6 @@ int main()
     typedef std::ratio<1, -0x7FFFFFFFFFFFFFFFLL> R2;
     test<R1, R2, true>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.comparison/ratio_less.pass.cpp b/test/std/utilities/ratio/ratio.comparison/ratio_less.pass.cpp
index a428be28a..45ba7cbf1 100644
--- a/test/std/utilities/ratio/ratio.comparison/ratio_less.pass.cpp
+++ b/test/std/utilities/ratio/ratio.comparison/ratio_less.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -94,4 +93,6 @@ int main()
     typedef std::ratio<641981, 1339063> R2;
     test<R1, R2, true>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.comparison/ratio_less_equal.pass.cpp b/test/std/utilities/ratio/ratio.comparison/ratio_less_equal.pass.cpp
index 7b224ab7c..ebb8624a8 100644
--- a/test/std/utilities/ratio/ratio.comparison/ratio_less_equal.pass.cpp
+++ b/test/std/utilities/ratio/ratio.comparison/ratio_less_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -64,4 +63,6 @@ int main()
     typedef std::ratio<1, -0x7FFFFFFFFFFFFFFFLL> R2;
     test<R1, R2, false>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.comparison/ratio_not_equal.pass.cpp b/test/std/utilities/ratio/ratio.comparison/ratio_not_equal.pass.cpp
index fcd31207f..5000e73d3 100644
--- a/test/std/utilities/ratio/ratio.comparison/ratio_not_equal.pass.cpp
+++ b/test/std/utilities/ratio/ratio.comparison/ratio_not_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::ratio<1, 1> R1;
@@ -64,4 +63,6 @@ int main()
     typedef std::ratio<1, -0x7FFFFFFFFFFFFFFFLL> R2;
     test<R1, R2, true>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.ratio/ratio.pass.cpp b/test/std/utilities/ratio/ratio.ratio/ratio.pass.cpp
index a7326162f..336d7d8e5 100644
--- a/test/std/utilities/ratio/ratio.ratio/ratio.pass.cpp
+++ b/test/std/utilities/ratio/ratio.ratio/ratio.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@ void test()
     static_assert((std::ratio<N, D>::den == eD), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<1, 1, 1, 1>();
     test<1, 10, 1, 10>();
@@ -41,4 +40,6 @@ int main()
     test<-0x7FFFFFFFFFFFFFFFLL, 127, -72624976668147841LL, 1>();
     test<0x7FFFFFFFFFFFFFFFLL, -127, -72624976668147841LL, 1>();
     test<-0x7FFFFFFFFFFFFFFFLL, -127, 72624976668147841LL, 1>();
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.ratio/ratio1.fail.cpp b/test/std/utilities/ratio/ratio.ratio/ratio1.fail.cpp
index e6dbf710b..0841d858d 100644
--- a/test/std/utilities/ratio/ratio.ratio/ratio1.fail.cpp
+++ b/test/std/utilities/ratio/ratio.ratio/ratio1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,9 @@
 #include <ratio>
 #include <cstdint>
 
-int main()
+int main(int, char**)
 {
     const std::intmax_t t1 = std::ratio<1, 0>::num;
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.ratio/ratio2.fail.cpp b/test/std/utilities/ratio/ratio.ratio/ratio2.fail.cpp
index 753e79af6..f8bebc862 100644
--- a/test/std/utilities/ratio/ratio.ratio/ratio2.fail.cpp
+++ b/test/std/utilities/ratio/ratio.ratio/ratio2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,9 @@
 #include <ratio>
 #include <cstdint>
 
-int main()
+int main(int, char**)
 {
     const std::intmax_t t1 = std::ratio<0x8000000000000000ULL, 1>::num;
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.ratio/ratio3.fail.cpp b/test/std/utilities/ratio/ratio.ratio/ratio3.fail.cpp
index f4b4ab950..78310c6a2 100644
--- a/test/std/utilities/ratio/ratio.ratio/ratio3.fail.cpp
+++ b/test/std/utilities/ratio/ratio.ratio/ratio3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,9 @@
 #include <ratio>
 #include <cstdint>
 
-int main()
+int main(int, char**)
 {
     const std::intmax_t t1 = std::ratio<1, 0x8000000000000000ULL>::num;
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/ratio.si/nothing_to_do.pass.cpp b/test/std/utilities/ratio/ratio.si/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/ratio/ratio.si/nothing_to_do.pass.cpp
+++ b/test/std/utilities/ratio/ratio.si/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/ratio/typedefs.pass.cpp b/test/std/utilities/ratio/typedefs.pass.cpp
index 5ab4c740d..8e24ff974 100644
--- a/test/std/utilities/ratio/typedefs.pass.cpp
+++ b/test/std/utilities/ratio/typedefs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,7 @@
 
 #include <ratio>
 
-int main()
+int main(int, char**)
 {
     static_assert(std::atto::num == 1 && std::atto::den == 1000000000000000000ULL, "");
     static_assert(std::femto::num == 1 && std::femto::den == 1000000000000000ULL, "");
@@ -29,4 +28,6 @@ int main()
     static_assert(std::tera::num == 1000000000000ULL && std::tera::den == 1, "");
     static_assert(std::peta::num == 1000000000000000ULL && std::peta::den == 1, "");
     static_assert(std::exa::num == 1000000000000000000ULL && std::exa::den == 1, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/nothing_to_do.pass.cpp b/test/std/utilities/smartptr/unique.ptr/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/smartptr/unique.ptr/nothing_to_do.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/pointer_type.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/pointer_type.pass.cpp
index 54c2cf16e..f0ca5b0ea 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/pointer_type.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/pointer_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,9 @@ void test_basic() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move.pass.cpp
index 5d2f955aa..bc42afda3 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -108,7 +107,7 @@ void test_sfinae() {
 }
 
 
-int main() {
+int main(int, char**) {
   {
     test_basic</*IsArray*/ false>();
     test_sfinae<false>();
@@ -117,4 +116,6 @@ int main() {
     test_basic</*IsArray*/ true>();
     test_sfinae<true>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.pass.cpp
index 8d83c3c88..c9ebdf633 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -406,7 +405,7 @@ void test_deleter_value_category() {
   }
 }
 
-int main() {
+int main(int, char**) {
   {
     test_sfinae</*IsArray*/false>();
     test_noexcept<false>();
@@ -417,4 +416,6 @@ int main() {
     test_noexcept<true>();
     test_deleter_value_category<true>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.runtime.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.runtime.pass.cpp
index 716a2b92a..ce9125465 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.runtime.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.runtime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -115,7 +114,9 @@ void test_sfinae() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_sfinae();
   // FIXME: add tests
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.single.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.single.pass.cpp
index 3f2ea422d..d5f46935a 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.single.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/move_convert.single.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -114,7 +113,7 @@ void test_sfinae() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_sfinae();
   {
     std::unique_ptr<B> bptr(new B);
@@ -142,4 +141,6 @@ int main() {
   }
   assert(A::count == 0);
   assert(B::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/null.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/null.pass.cpp
index 165d48a1c..ecba79dfd 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/null.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/null.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,9 @@ void test_basic() {
   assert(A::count == 0);
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/nullptr.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/nullptr.pass.cpp
index e1e2e32e2..5cd44b2f6 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/nullptr.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.asgn/nullptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,9 @@ void test_basic() {
   assert(A::count == 0);
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/auto_pointer.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/auto_pointer.pass.cpp
index 7d5e9bca6..577a906fb 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/auto_pointer.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/auto_pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ void test_sfinae() {
   }
 }
 
-int main() {
+int main(int, char**) {
   {
     B* p = new B;
     std::auto_ptr<B> ap(p);
@@ -94,4 +93,6 @@ int main() {
   }
 #endif
   test_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/default.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/default.pass.cpp
index 2a7949f64..1bd53b9a9 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/default.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -95,7 +94,7 @@ DEFINE_AND_RUN_IS_INCOMPLETE_TEST({
   doIncompleteTypeTest<IncompleteType[], Deleter<IncompleteType[]> >(0);
 })
 
-int main() {
+int main(int, char**) {
   {
     test_sfinae<int>();
     test_basic<int>();
@@ -104,4 +103,6 @@ int main() {
     test_sfinae<int[]>();
     test_basic<int[]>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move.pass.cpp
index c102f27fb..7c07b2ec9 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -160,7 +159,7 @@ void test_noexcept() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   {
     test_basic</*IsArray*/ false>();
     test_sfinae<int>();
@@ -171,4 +170,6 @@ int main() {
     test_sfinae<int[]>();
     test_noexcept<int[]>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.pass.cpp
index 769deea92..3d0bb1cd1 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -205,7 +204,7 @@ void test_deleter_value_category() {
 }
 
 
-int main() {
+int main(int, char**) {
   {
     test_sfinae</*IsArray*/false>();
     test_noexcept<false>();
@@ -216,4 +215,6 @@ int main() {
     test_noexcept<true>();
     test_deleter_value_category<true>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.runtime.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.runtime.pass.cpp
index 09e842b59..bcf85b110 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.runtime.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.runtime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -78,6 +77,8 @@ void test_sfinae() {
 }
 
 
-int main() {
+int main(int, char**) {
   test_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.single.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.single.pass.cpp
index d747483a9..1dcf0cf32 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.single.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/move_convert.single.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 
 //===----------------------------------------------------------------------===//
@@ -158,7 +157,7 @@ void test_noexcept() {
   }
 }
 
-int main() {
+int main(int, char**) {
   {
     test_sfinae();
     test_noexcept();
@@ -245,4 +244,6 @@ int main() {
     }
     checkNoneAlive();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/null.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/null.pass.cpp
index 8bc8a57c1..d24538832 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/null.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/null.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -62,7 +61,7 @@ void test_pointer_deleter_ctor() {
   }
 }
 
-int main() {
+int main(int, char**) {
   {
     // test_pointer_ctor<int>();
     test_pointer_deleter_ctor<int>();
@@ -71,4 +70,6 @@ int main() {
     test_pointer_ctor<int[]>();
     test_pointer_deleter_ctor<int[]>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/nullptr.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/nullptr.pass.cpp
index 6764935fe..9ec7f7a4e 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/nullptr.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/nullptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -94,7 +93,7 @@ DEFINE_AND_RUN_IS_INCOMPLETE_TEST({
   checkNumIncompleteTypeAlive(0);
 })
 
-int main() {
+int main(int, char**) {
   {
     test_basic<int>();
     test_sfinae<int>();
@@ -103,4 +102,6 @@ int main() {
     test_basic<int[]>();
     test_sfinae<int[]>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer.pass.cpp
index 8df259bd4..48d41fc5c 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -157,7 +156,7 @@ DEFINE_AND_RUN_IS_INCOMPLETE_TEST({
   checkNumIncompleteTypeAlive(0);
 })
 
-int main() {
+int main(int, char**) {
   {
     test_pointer</*IsArray*/ false>();
     test_derived();
@@ -168,4 +167,6 @@ int main() {
     test_sfinae<int[]>();
     test_sfinae_runtime();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.fail.cpp
index b4cd3f36a..ccb4924d0 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,9 @@ struct Deleter {
   void operator()(int* p) const { delete p; }
 };
 
-int main() {
+int main(int, char**) {
   // expected-error@+1 {{call to deleted constructor of 'std::unique_ptr<int, const Deleter &>}}
   std::unique_ptr<int, const Deleter&> s((int*)nullptr, Deleter());
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.pass.cpp
index 781794d41..59861effb 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.ctor/pointer_deleter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -310,7 +309,7 @@ void test_nullptr() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   {
     test_basic</*IsArray*/ false>();
     test_nullptr<false>();
@@ -325,4 +324,6 @@ int main() {
     test_sfinae_runtime();
     test_noexcept<true>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.dtor/null.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.dtor/null.pass.cpp
index fa10ade51..9ef48b2e4 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.dtor/null.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.dtor/null.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,9 @@ void test_basic() {
   assert(d.state() == 0);
 }
 
-int main() {
+int main(int, char**) {
   test_basic<int>();
   test_basic<int[]>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/release.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/release.pass.cpp
index f7f209450..f080165d5 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/release.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/release.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,9 @@ void test_basic() {
   assert(A::count == 0);
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.pass.cpp
index c95c55b4a..46569918a 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -103,7 +102,7 @@ void test_reset_no_arg() {
   assert(A::count == 0);
 }
 
-int main() {
+int main(int, char**) {
   {
     test_reset_pointer</*IsArray*/ false>();
     test_reset_nullptr<false>();
@@ -114,4 +113,6 @@ int main() {
     test_reset_nullptr<true>();
     test_reset_no_arg<true>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.runtime.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.runtime.fail.cpp
index 0d067b9ab..7e3085a5b 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.runtime.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.runtime.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "unique_ptr_test_helper.h"
 
-int main() {
+int main(int, char**) {
   {
     std::unique_ptr<A[]> p;
     p.reset(static_cast<B*>(nullptr)); // expected-error {{no matching member function for call to 'reset'}}
@@ -27,4 +26,6 @@ int main() {
     std::unique_ptr<int[]> p;
     p.reset(static_cast<const int*>(nullptr)); // expected-error {{no matching member function for call to 'reset'}}
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.single.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.single.pass.cpp
index 8f2a69913..4f5a519b7 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.single.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset.single.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "unique_ptr_test_helper.h"
 
-int main() {
+int main(int, char**) {
   {
     std::unique_ptr<A> p(new A);
     assert(A::count == 1);
@@ -43,4 +42,6 @@ int main() {
   }
   assert(A::count == 0);
   assert(B::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset_self.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset_self.pass.cpp
index f838661c5..d5e15aafe 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset_self.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/reset_self.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,4 +21,6 @@ struct A {
   void reset() { ptr_.reset(); }
 };
 
-int main() { (new A)->reset(); }
+int main(int, char**) { (new A)->reset(); 
+  return 0;
+}
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/swap.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/swap.pass.cpp
index de18865c5..35e997e30 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/swap.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.modifiers/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -82,7 +81,9 @@ void test_basic() {
   assert(TT::count == 0);
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.runtime.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.runtime.fail.cpp
index 50058a620..8a5566b91 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.runtime.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.runtime.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <memory>
 #include <cassert>
 
-int main() {
+int main(int, char**) {
   std::unique_ptr<int[]> p(new int(3));
   const std::unique_ptr<int[]>& cp = p;
   TEST_IGNORE_NODISCARD (*p);  // expected-error {{indirection requires pointer operand ('std::unique_ptr<int []>' invalid)}}
   TEST_IGNORE_NODISCARD (*cp); // expected-error {{indirection requires pointer operand ('const std::unique_ptr<int []>' invalid)}}
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.single.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.single.pass.cpp
index b2d3da48d..254d88bb6 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.single.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/dereference.single.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 #include <memory>
 #include <cassert>
 
-int main() {
+int main(int, char**) {
   std::unique_ptr<int> p(new int(3));
   assert(*p == 3);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/explicit_bool.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/explicit_bool.pass.cpp
index 9a6d6c65f..500821fb8 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/explicit_bool.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/explicit_bool.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -60,7 +59,9 @@ void test_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get.pass.cpp
index 518e31cf9..1ff965f56 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,9 @@ void test_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get_deleter.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get_deleter.pass.cpp
index 6a00d14a2..e440a9599 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get_deleter.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/get_deleter.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,9 @@ void test_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_basic</*IsArray*/ false>();
   test_basic<true>();
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.runtime.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.runtime.fail.cpp
index d66af054c..4fa94f137 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.runtime.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.runtime.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@ struct V {
   int member;
 };
 
-int main() {
+int main(int, char**) {
   std::unique_ptr<V[]> p;
   std::unique_ptr<V[]> const& cp = p;
 
@@ -29,4 +28,6 @@ int main() {
 
   cp->member; // expected-error {{member reference type 'const std::unique_ptr<V []>' is not a pointer}}
               // expected-error@-1 {{no member named 'member'}}
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.single.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.single.pass.cpp
index 8bed9dda2..f31ca6b28 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.single.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_arrow.single.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,9 @@ struct A {
   A() : i_(7) {}
 };
 
-int main() {
+int main(int, char**) {
   std::unique_ptr<A> p(new A);
   assert(p->i_ == 7);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.runtime.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.runtime.pass.cpp
index b47c35afb..21e7e6616 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.runtime.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.runtime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ public:
 
 int A::next_ = 0;
 
-int main() {
+int main(int, char**) {
   std::unique_ptr<A[]> p(new A[3]);
   assert(p[0] == 1);
   assert(p[1] == 2);
@@ -45,4 +44,6 @@ int main() {
   assert(p[0] == 3);
   assert(p[1] == 2);
   assert(p[2] == 1);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.single.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.single.fail.cpp
index 529749da6..66286aa86 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.single.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.class/unique.ptr.observers/op_subscript.single.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <memory>
 #include <cassert>
 
-int main() {
+int main(int, char**) {
   std::unique_ptr<int> p(new int[3]);
   std::unique_ptr<int> const& cp = p;
   p[0];  // expected-error {{type 'std::unique_ptr<int>' does not provide a subscript operator}}
   cp[1]; // expected-error {{type 'const std::unique_ptr<int>' does not provide a subscript operator}}
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array.pass.cpp
index 30b4ecb94..715335eb1 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@ private:
     int val_;
     };
 
-int main()
+int main(int, char**)
 {
     {
     auto p1 = std::make_unique<int[]>(5);
@@ -41,4 +40,6 @@ int main()
     for ( int i = 0; i < 7; ++i )
         assert ( p3[i].get () == 3 );
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array1.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array1.fail.cpp
index 009879194..56adccf17 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array1.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     auto up1 = std::make_unique<std::string[]>("error"); // doesn't compile - no bound
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array2.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array2.fail.cpp
index cc94e9ab3..fda45ab89 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array2.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     auto up2 = std::make_unique<int[]>(10, 20, 30, 40);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array3.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array3.fail.cpp
index cfdc2e1d8..9fa05c79d 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array3.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     auto up3 = std::make_unique<int[5]>();    // this is deleted
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array4.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array4.fail.cpp
index 07aa659bd..d98f052b5 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array4.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.array4.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,7 +10,9 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     auto up4 = std::make_unique<int[5]>(11, 22, 33, 44, 55); // deleted
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.single.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.single.pass.cpp
index ace2e4fc7..08062c122 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.single.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.create/make_unique.single.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
     std::unique_ptr<int> p1 = std::make_unique<int>(1);
@@ -29,4 +28,6 @@ int main()
     p2 = std::make_unique<std::string> ( 6, 'z' );
     assert ( *p2 == "zzzzzz" );
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/nothing_to_do.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/nothing_to_do.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/convert_ctor.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/convert_ctor.pass.cpp
index 9bf794cae..6b8407c57 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/convert_ctor.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/convert_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct B
 
 int B::count = 0;
 
-int main()
+int main(int, char**)
 {
     std::default_delete<B> d2;
     std::default_delete<A> d1 = d2;
@@ -45,4 +44,6 @@ int main()
     d1(p);
     assert(A::count == 0);
     assert(B::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/default.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/default.pass.cpp
index f686e9f01..e7cbeaba5 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/default.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     std::default_delete<A> d;
     A* p = new A;
     assert(A::count == 1);
     d(p);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/incomplete.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/incomplete.fail.cpp
index 255e5cd39..75f02d7c6 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/incomplete.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/incomplete.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 struct A;
 
-int main()
+int main(int, char**)
 {
     std::default_delete<A> d;
     A* p = 0;
     d(p);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/void.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/void.fail.cpp
index 5d1cf1ff4..3bffeb576 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/void.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt/void.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::default_delete<const void> d;
     const void* p = 0;
     d(p);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.fail.cpp
index 41209d977..4a2bb5f7d 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,8 +24,10 @@ struct B
 {
 };
 
-int main()
+int main(int, char**)
 {
     std::default_delete<B[]> d2;
     std::default_delete<A[]> d1 = d2;
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.pass.cpp
index 2949d6310..14e210598 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/convert_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,9 +19,11 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::default_delete<int[]> d1;
     std::default_delete<const int[]> d2 = d1;
     ((void)d2);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/default.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/default.pass.cpp
index 7a4097664..9b220462b 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/default.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,11 +25,13 @@ struct A
 
 int A::count = 0;
 
-int main()
+int main(int, char**)
 {
     std::default_delete<A[]> d;
     A* p = new A[3];
     assert(A::count == 3);
     d(p);
     assert(A::count == 0);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/incomplete.fail.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/incomplete.fail.cpp
index 528b10e90..54fe0fcf7 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/incomplete.fail.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.dflt1/incomplete.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 
 struct A;
 
-int main()
+int main(int, char**)
 {
     std::default_delete<A[]> d;
     A* p = 0;
     d(p);
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.general/nothing_to_do.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.general/nothing_to_do.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.dltr/unique.ptr.dltr.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/cmp_nullptr.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/cmp_nullptr.pass.cpp
index 22ae217a6..52c399e64 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/cmp_nullptr.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/cmp_nullptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@
 
 void do_nothing(int*) {}
 
-int main()
+int main(int, char**)
 {
     const std::unique_ptr<int> p1(new int(1));
     assert(!(p1 == nullptr));
@@ -66,4 +65,6 @@ int main()
     assert(!(nullptr > p2));
     assert( (p2 >= nullptr));
     assert( (nullptr >= p2));
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/eq.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/eq.pass.cpp
index 88a1e04ba..ce83b5750 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/eq.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct B
 
 int B::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
     const std::unique_ptr<A, Deleter<A> > p1(new A);
@@ -83,4 +82,6 @@ int main()
     assert(p1 == p2);
     assert(!(p1 != p2));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/rel.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/rel.pass.cpp
index 94ae89ba9..5fad4beb6 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/rel.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/rel.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ struct B
 
 int B::count = 0;
 
-int main()
+int main(int, char**)
 {
     {
     const std::unique_ptr<A, Deleter<A> > p1(new A);
@@ -97,4 +96,6 @@ int main()
     assert((p1 < p2) == !(p1 <= p2));
     assert((p1 < p2) == !(p1 >= p2));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/swap.pass.cpp b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/swap.pass.cpp
index 7ac0ba490..4e45bbaef 100644
--- a/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/swap.pass.cpp
+++ b/test/std/utilities/smartptr/unique.ptr/unique.ptr.special/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ private:
 
 };
 
-int main()
+int main(int, char**)
 {
     {
     A* p1 = new A(1);
@@ -99,4 +98,6 @@ int main()
         std::swap(p, p2);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.cons/char_ptr_ctor.pass.cpp b/test/std/utilities/template.bitset/bitset.cons/char_ptr_ctor.pass.cpp
index 8830bf932..ee6405bde 100644
--- a/test/std/utilities/template.bitset/bitset.cons/char_ptr_ctor.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.cons/char_ptr_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_char_pointer_ctor()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_char_pointer_ctor<0>();
     test_char_pointer_ctor<1>();
@@ -58,4 +57,6 @@ int main()
     test_char_pointer_ctor<64>();
     test_char_pointer_ctor<65>();
     test_char_pointer_ctor<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.cons/default.pass.cpp b/test/std/utilities/template.bitset/bitset.cons/default.pass.cpp
index 0ebf9b0b6..bb5de6b18 100644
--- a/test/std/utilities/template.bitset/bitset.cons/default.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ void test_default_ctor()
 }
 
 
-int main()
+int main(int, char**)
 {
     test_default_ctor<0>();
     test_default_ctor<1>();
@@ -47,4 +46,6 @@ int main()
     test_default_ctor<64>();
     test_default_ctor<65>();
     test_default_ctor<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp b/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp
index 91e9441fe..453db91f2 100644
--- a/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.cons/string_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -75,7 +74,7 @@ void test_string_ctor()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_string_ctor<0>();
     test_string_ctor<1>();
@@ -86,4 +85,6 @@ int main()
     test_string_ctor<64>();
     test_string_ctor<65>();
     test_string_ctor<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.cons/ull_ctor.pass.cpp b/test/std/utilities/template.bitset/bitset.cons/ull_ctor.pass.cpp
index be9d54716..4697d8bd3 100644
--- a/test/std/utilities/template.bitset/bitset.cons/ull_ctor.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.cons/ull_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test_val_ctor()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_val_ctor<0>();
     test_val_ctor<1>();
@@ -51,4 +50,6 @@ int main()
     test_val_ctor<64>();
     test_val_ctor<65>();
     test_val_ctor<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp b/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp
index 97ab0c44c..dfac9d94a 100644
--- a/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.hash/bitset.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,10 +38,12 @@ test()
     ((void)result); // Prevent unused warning
 }
 
-int main()
+int main(int, char**)
 {
     test<0>();
     test<10>();
     test<100>();
     test<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.hash/enabled_hash.pass.cpp b/test/std/utilities/template.bitset/bitset.hash/enabled_hash.pass.cpp
index 1d8bff41a..a499b66fd 100644
--- a/test/std/utilities/template.bitset/bitset.hash/enabled_hash.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.hash/enabled_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
   {
     test_hash_enabled_for_type<std::bitset<0> >();
@@ -26,4 +25,6 @@ int main() {
     test_hash_enabled_for_type<std::bitset<1024> >();
     test_hash_enabled_for_type<std::bitset<100000> >();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/all.pass.cpp b/test/std/utilities/template.bitset/bitset.members/all.pass.cpp
index de1cddb5b..fe9e0e0a3 100644
--- a/test/std/utilities/template.bitset/bitset.members/all.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ void test_all()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_all<0>();
     test_all<1>();
@@ -40,4 +39,6 @@ int main()
     test_all<64>();
     test_all<65>();
     test_all<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/any.pass.cpp b/test/std/utilities/template.bitset/bitset.members/any.pass.cpp
index 7ee83dd07..95b640178 100644
--- a/test/std/utilities/template.bitset/bitset.members/any.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/any.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test_any()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_any<0>();
     test_any<1>();
@@ -43,4 +42,6 @@ int main()
     test_any<64>();
     test_any<65>();
     test_any<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/count.pass.cpp b/test/std/utilities/template.bitset/bitset.members/count.pass.cpp
index f6730a4fc..5b04666bc 100644
--- a/test/std/utilities/template.bitset/bitset.members/count.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/count.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ void test_count()
     assert(c1 == c2);
 }
 
-int main()
+int main(int, char**)
 {
     test_count<0>();
     test_count<1>();
@@ -54,4 +53,6 @@ int main()
     test_count<64>();
     test_count<65>();
     test_count<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/flip_all.pass.cpp b/test/std/utilities/template.bitset/bitset.members/flip_all.pass.cpp
index 6d6bcd711..14bd9eadf 100644
--- a/test/std/utilities/template.bitset/bitset.members/flip_all.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/flip_all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ void test_flip_all()
         assert(v2[i] == ~v1[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test_flip_all<0>();
     test_flip_all<1>();
@@ -52,4 +51,6 @@ int main()
     test_flip_all<64>();
     test_flip_all<65>();
     test_flip_all<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/flip_one.pass.cpp b/test/std/utilities/template.bitset/bitset.members/flip_one.pass.cpp
index fb47e0cfb..235b7e1a7 100644
--- a/test/std/utilities/template.bitset/bitset.members/flip_one.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/flip_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -59,7 +58,7 @@ void test_flip_one(bool test_throws)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_flip_one<0>(true);
     test_flip_one<1>(true);
@@ -70,4 +69,6 @@ int main()
     test_flip_one<64>(false);
     test_flip_one<65>(false);
     test_flip_one<1000>(false);
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/index.pass.cpp b/test/std/utilities/template.bitset/bitset.members/index.pass.cpp
index c29ba312a..a6eea1450 100644
--- a/test/std/utilities/template.bitset/bitset.members/index.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -61,7 +60,7 @@ void test_index_const()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_index_const<0>();
     test_index_const<1>();
@@ -72,4 +71,6 @@ int main()
     test_index_const<64>();
     test_index_const<65>();
     test_index_const<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/index_const.pass.cpp b/test/std/utilities/template.bitset/bitset.members/index_const.pass.cpp
index 1ac0495da..9c6e28a88 100644
--- a/test/std/utilities/template.bitset/bitset.members/index_const.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/index_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ void test_index_const()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_index_const<0>();
     test_index_const<1>();
@@ -54,4 +53,6 @@ int main()
     test_index_const<64>();
     test_index_const<65>();
     test_index_const<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/left_shift.pass.cpp b/test/std/utilities/template.bitset/bitset.members/left_shift.pass.cpp
index 9d630b972..59a7954a0 100644
--- a/test/std/utilities/template.bitset/bitset.members/left_shift.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/left_shift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ void test_left_shift()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_left_shift<0>();
     test_left_shift<1>();
@@ -53,4 +52,6 @@ int main()
     test_left_shift<64>();
     test_left_shift<65>();
     test_left_shift<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/left_shift_eq.pass.cpp b/test/std/utilities/template.bitset/bitset.members/left_shift_eq.pass.cpp
index bbbddb9a2..ad307ae82 100644
--- a/test/std/utilities/template.bitset/bitset.members/left_shift_eq.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/left_shift_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_left_shift()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_left_shift<0>();
     test_left_shift<1>();
@@ -58,4 +57,6 @@ int main()
     test_left_shift<64>();
     test_left_shift<65>();
     test_left_shift<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/none.pass.cpp b/test/std/utilities/template.bitset/bitset.members/none.pass.cpp
index 1358eaa62..2588ac60f 100644
--- a/test/std/utilities/template.bitset/bitset.members/none.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/none.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ void test_none()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_none<0>();
     test_none<1>();
@@ -43,4 +42,6 @@ int main()
     test_none<64>();
     test_none<65>();
     test_none<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/not_all.pass.cpp b/test/std/utilities/template.bitset/bitset.members/not_all.pass.cpp
index 4f152e3f9..17b2d4293 100644
--- a/test/std/utilities/template.bitset/bitset.members/not_all.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/not_all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test_not_all()
         assert(v2[i] == ~v1[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test_not_all<0>();
     test_not_all<1>();
@@ -51,4 +50,6 @@ int main()
     test_not_all<64>();
     test_not_all<65>();
     test_not_all<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/op_and_eq.pass.cpp b/test/std/utilities/template.bitset/bitset.members/op_and_eq.pass.cpp
index eaac19124..8560be246 100644
--- a/test/std/utilities/template.bitset/bitset.members/op_and_eq.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/op_and_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ void test_op_and_eq()
         assert(v1[i] == (v3[i] && v2[i]));
 }
 
-int main()
+int main(int, char**)
 {
     test_op_and_eq<0>();
     test_op_and_eq<1>();
@@ -53,4 +52,6 @@ int main()
     test_op_and_eq<64>();
     test_op_and_eq<65>();
     test_op_and_eq<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/op_eq_eq.pass.cpp b/test/std/utilities/template.bitset/bitset.members/op_eq_eq.pass.cpp
index 52157696e..d2363023e 100644
--- a/test/std/utilities/template.bitset/bitset.members/op_eq_eq.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/op_eq_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void test_equality()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_equality<0>();
     test_equality<1>();
@@ -60,4 +59,6 @@ int main()
     test_equality<64>();
     test_equality<65>();
     test_equality<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/op_or_eq.pass.cpp b/test/std/utilities/template.bitset/bitset.members/op_or_eq.pass.cpp
index 98c7ce509..42d525e5b 100644
--- a/test/std/utilities/template.bitset/bitset.members/op_or_eq.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/op_or_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ void test_op_or_eq()
         assert(v1[i] == (v3[i] || v2[i]));
 }
 
-int main()
+int main(int, char**)
 {
     test_op_or_eq<0>();
     test_op_or_eq<1>();
@@ -53,4 +52,6 @@ int main()
     test_op_or_eq<64>();
     test_op_or_eq<65>();
     test_op_or_eq<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/op_xor_eq.pass.cpp b/test/std/utilities/template.bitset/bitset.members/op_xor_eq.pass.cpp
index a707a7f4d..44d58d8a1 100644
--- a/test/std/utilities/template.bitset/bitset.members/op_xor_eq.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/op_xor_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ void test_op_xor_eq()
         assert(v1[i] == (v3[i] != v2[i]));
 }
 
-int main()
+int main(int, char**)
 {
     test_op_xor_eq<0>();
     test_op_xor_eq<1>();
@@ -53,4 +52,6 @@ int main()
     test_op_xor_eq<64>();
     test_op_xor_eq<65>();
     test_op_xor_eq<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/reset_all.pass.cpp b/test/std/utilities/template.bitset/bitset.members/reset_all.pass.cpp
index 69de45e03..91041176d 100644
--- a/test/std/utilities/template.bitset/bitset.members/reset_all.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/reset_all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ void test_reset_all()
         assert(!v[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test_reset_all<0>();
     test_reset_all<1>();
@@ -41,4 +40,6 @@ int main()
     test_reset_all<64>();
     test_reset_all<65>();
     test_reset_all<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/reset_one.pass.cpp b/test/std/utilities/template.bitset/bitset.members/reset_one.pass.cpp
index e1bf6b876..1abb4914b 100644
--- a/test/std/utilities/template.bitset/bitset.members/reset_one.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/reset_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ void test_reset_one(bool test_throws)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_reset_one<0>(true);
     test_reset_one<1>(true);
@@ -55,4 +54,6 @@ int main()
     test_reset_one<64>(false);
     test_reset_one<65>(false);
     test_reset_one<1000>(false);
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/right_shift.pass.cpp b/test/std/utilities/template.bitset/bitset.members/right_shift.pass.cpp
index 554abde32..e05c3316b 100644
--- a/test/std/utilities/template.bitset/bitset.members/right_shift.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/right_shift.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ void test_right_shift()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_right_shift<0>();
     test_right_shift<1>();
@@ -53,4 +52,6 @@ int main()
     test_right_shift<64>();
     test_right_shift<65>();
     test_right_shift<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/right_shift_eq.pass.cpp b/test/std/utilities/template.bitset/bitset.members/right_shift_eq.pass.cpp
index 8e5edbe38..f23fbeebc 100644
--- a/test/std/utilities/template.bitset/bitset.members/right_shift_eq.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/right_shift_eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_right_shift()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_right_shift<0>();
     test_right_shift<1>();
@@ -58,4 +57,6 @@ int main()
     test_right_shift<64>();
     test_right_shift<65>();
     test_right_shift<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/set_all.pass.cpp b/test/std/utilities/template.bitset/bitset.members/set_all.pass.cpp
index 45bc2b9ca..ca4708cc4 100644
--- a/test/std/utilities/template.bitset/bitset.members/set_all.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/set_all.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ void test_set_all()
         assert(v[i]);
 }
 
-int main()
+int main(int, char**)
 {
     test_set_all<0>();
     test_set_all<1>();
@@ -40,4 +39,6 @@ int main()
     test_set_all<64>();
     test_set_all<65>();
     test_set_all<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/set_one.pass.cpp b/test/std/utilities/template.bitset/bitset.members/set_one.pass.cpp
index e46ed978d..f723eebe0 100644
--- a/test/std/utilities/template.bitset/bitset.members/set_one.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/set_one.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -53,7 +52,7 @@ void test_set_one(bool test_throws)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_set_one<0>(true);
     test_set_one<1>(true);
@@ -64,4 +63,6 @@ int main()
     test_set_one<64>(false);
     test_set_one<65>(false);
     test_set_one<1000>(false);
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/size.pass.cpp b/test/std/utilities/template.bitset/bitset.members/size.pass.cpp
index 822e0a048..41318d99e 100644
--- a/test/std/utilities/template.bitset/bitset.members/size.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@ void test_size()
     assert(v.size() == N);
 }
 
-int main()
+int main(int, char**)
 {
     test_size<0>();
     test_size<1>();
@@ -30,4 +29,6 @@ int main()
     test_size<64>();
     test_size<65>();
     test_size<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/test.pass.cpp b/test/std/utilities/template.bitset/bitset.members/test.pass.cpp
index 4a1c0e23b..5d566f5d0 100644
--- a/test/std/utilities/template.bitset/bitset.members/test.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ void test_test(bool test_throws)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test_test<0>(true);
     test_test<1>(true);
@@ -65,4 +64,6 @@ int main()
     test_test<64>(false);
     test_test<65>(false);
     test_test<1000>(false);
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/to_string.pass.cpp b/test/std/utilities/template.bitset/bitset.members/to_string.pass.cpp
index 37824d81b..3897e1037 100644
--- a/test/std/utilities/template.bitset/bitset.members/to_string.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/to_string.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -154,7 +153,7 @@ void test_to_string()
 }
 }
 
-int main()
+int main(int, char**)
 {
     test_to_string<0>();
     test_to_string<1>();
@@ -165,4 +164,6 @@ int main()
     test_to_string<64>();
     test_to_string<65>();
     test_to_string<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp b/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
index 20578511c..c43ef90ae 100644
--- a/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ void test_to_ullong()
     }
 }
 
-int main()
+int main(int, char**)
 {
 //     test_to_ullong<0>();
     test_to_ullong<1>();
@@ -56,4 +55,6 @@ int main()
     test_to_ullong<64>();
     test_to_ullong<65>();
     test_to_ullong<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.members/to_ulong.pass.cpp b/test/std/utilities/template.bitset/bitset.members/to_ulong.pass.cpp
index 0872d77bc..c6cf6b19a 100644
--- a/test/std/utilities/template.bitset/bitset.members/to_ulong.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.members/to_ulong.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_to_ulong()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_to_ulong<0>();
     test_to_ulong<1>();
@@ -58,4 +57,6 @@ int main()
     test_to_ulong<64>();
     test_to_ulong<65>();
     test_to_ulong<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.operators/op_and.pass.cpp b/test/std/utilities/template.bitset/bitset.operators/op_and.pass.cpp
index e58c72016..21d5d0805 100644
--- a/test/std/utilities/template.bitset/bitset.operators/op_and.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.operators/op_and.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test_op_and()
     assert((v1 & v2) == (v3 &= v2));
 }
 
-int main()
+int main(int, char**)
 {
     test_op_and<0>();
     test_op_and<1>();
@@ -51,4 +50,6 @@ int main()
     test_op_and<64>();
     test_op_and<65>();
     test_op_and<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.operators/op_not.pass.cpp b/test/std/utilities/template.bitset/bitset.operators/op_not.pass.cpp
index 244a2ba54..4a71385a9 100644
--- a/test/std/utilities/template.bitset/bitset.operators/op_not.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.operators/op_not.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test_op_not()
     assert((v1 ^ v2) == (v3 ^= v2));
 }
 
-int main()
+int main(int, char**)
 {
     test_op_not<0>();
     test_op_not<1>();
@@ -51,4 +50,6 @@ int main()
     test_op_not<64>();
     test_op_not<65>();
     test_op_not<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.operators/op_or.pass.cpp b/test/std/utilities/template.bitset/bitset.operators/op_or.pass.cpp
index e601b26cf..bc4847c19 100644
--- a/test/std/utilities/template.bitset/bitset.operators/op_or.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.operators/op_or.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test_op_or()
     assert((v1 | v2) == (v3 |= v2));
 }
 
-int main()
+int main(int, char**)
 {
     test_op_or<0>();
     test_op_or<1>();
@@ -51,4 +50,6 @@ int main()
     test_op_or<64>();
     test_op_or<65>();
     test_op_or<1000>();
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.operators/stream_in.pass.cpp b/test/std/utilities/template.bitset/bitset.operators/stream_in.pass.cpp
index 4c8afe3f9..9abe19c7c 100644
--- a/test/std/utilities/template.bitset/bitset.operators/stream_in.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.operators/stream_in.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::istringstream in("01011010");
     std::bitset<8> b;
     in >> b;
     assert(b.to_ulong() == 0x5A);
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/bitset.operators/stream_out.pass.cpp b/test/std/utilities/template.bitset/bitset.operators/stream_out.pass.cpp
index 05efe27fa..2c4ce1e48 100644
--- a/test/std/utilities/template.bitset/bitset.operators/stream_out.pass.cpp
+++ b/test/std/utilities/template.bitset/bitset.operators/stream_out.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 #include <sstream>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::ostringstream os;
     std::bitset<8> b(0x5A);
     os << b;
     assert(os.str() == "01011010");
+
+  return 0;
 }
diff --git a/test/std/utilities/template.bitset/includes.pass.cpp b/test/std/utilities/template.bitset/includes.pass.cpp
index 021ca28e6..90695ed3d 100644
--- a/test/std/utilities/template.bitset/includes.pass.cpp
+++ b/test/std/utilities/template.bitset/includes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 
 template <class> void test_typedef() {}
 
-int main()
+int main(int, char**)
 {
   { // test for <string>
     std::string s; ((void)s);
@@ -25,4 +24,6 @@ int main()
     test_typedef<std::ostream>();
     test_typedef<std::iostream>();
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/clock.h b/test/std/utilities/time/clock.h
index c72470c9c..3a637ee14 100644
--- a/test/std/utilities/time/clock.h
+++ b/test/std/utilities/time/clock.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/time/date.time/ctime.pass.cpp b/test/std/utilities/time/date.time/ctime.pass.cpp
index f6dd75d24..ac29fd781 100644
--- a/test/std/utilities/time/date.time/ctime.pass.cpp
+++ b/test/std/utilities/time/date.time/ctime.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@
 #pragma GCC diagnostic ignored "-Wformat-zero-length"
 #endif
 
-int main()
+int main(int, char**)
 {
     std::clock_t c = 0;
     std::size_t s = 0;
@@ -61,4 +60,6 @@ int main()
     static_assert((std::is_same<decltype(std::localtime(&t)), std::tm*>::value), "");
 #endif
     static_assert((std::is_same<decltype(std::strftime(str,s,"",&tm)), std::size_t>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/days.pass.cpp b/test/std/utilities/time/days.pass.cpp
index 14ab01a65..43b53ea33 100644
--- a/test/std/utilities/time/days.pass.cpp
+++ b/test/std/utilities/time/days.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -16,7 +15,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::days D;
     typedef D::rep Rep;
@@ -25,4 +24,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 25, "");
     static_assert(std::is_same_v<Period, std::ratio_multiply<std::ratio<24>, std::chrono::hours::period>>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/hours.pass.cpp b/test/std/utilities/time/hours.pass.cpp
index e4c39f785..97fc2621b 100644
--- a/test/std/utilities/time/hours.pass.cpp
+++ b/test/std/utilities/time/hours.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::hours D;
     typedef D::rep Rep;
@@ -24,4 +23,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 22, "");
     static_assert((std::is_same<Period, std::ratio<3600> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/microseconds.pass.cpp b/test/std/utilities/time/microseconds.pass.cpp
index 1fe6b10da..ded1c22fe 100644
--- a/test/std/utilities/time/microseconds.pass.cpp
+++ b/test/std/utilities/time/microseconds.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::microseconds D;
     typedef D::rep Rep;
@@ -24,4 +23,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 54, "");
     static_assert((std::is_same<Period, std::micro>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/milliseconds.pass.cpp b/test/std/utilities/time/milliseconds.pass.cpp
index 75df301f7..b1fe99e12 100644
--- a/test/std/utilities/time/milliseconds.pass.cpp
+++ b/test/std/utilities/time/milliseconds.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::milliseconds D;
     typedef D::rep Rep;
@@ -24,4 +23,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 44, "");
     static_assert((std::is_same<Period, std::milli>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/minutes.pass.cpp b/test/std/utilities/time/minutes.pass.cpp
index 14214861c..23f0bf287 100644
--- a/test/std/utilities/time/minutes.pass.cpp
+++ b/test/std/utilities/time/minutes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::minutes D;
     typedef D::rep Rep;
@@ -24,4 +23,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 28, "");
     static_assert((std::is_same<Period, std::ratio<60> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/months.pass.cpp b/test/std/utilities/time/months.pass.cpp
index 63f85623e..b14b2fab5 100644
--- a/test/std/utilities/time/months.pass.cpp
+++ b/test/std/utilities/time/months.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,7 +16,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::months D;
     typedef D::rep Rep;
@@ -26,4 +25,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 20, "");
     static_assert(std::is_same_v<Period, std::ratio_divide<std::chrono::years::period, std::ratio<12>>>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/nanoseconds.pass.cpp b/test/std/utilities/time/nanoseconds.pass.cpp
index d422803f4..d58a375c2 100644
--- a/test/std/utilities/time/nanoseconds.pass.cpp
+++ b/test/std/utilities/time/nanoseconds.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::nanoseconds D;
     typedef D::rep Rep;
@@ -24,4 +23,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 63, "");
     static_assert((std::is_same<Period, std::nano>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/rep.h b/test/std/utilities/time/rep.h
index 1c76582d3..f54eef3ef 100644
--- a/test/std/utilities/time/rep.h
+++ b/test/std/utilities/time/rep.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/time/seconds.pass.cpp b/test/std/utilities/time/seconds.pass.cpp
index 231d59695..45a3f1d8e 100644
--- a/test/std/utilities/time/seconds.pass.cpp
+++ b/test/std/utilities/time/seconds.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::seconds D;
     typedef D::rep Rep;
@@ -24,4 +23,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 34, "");
     static_assert((std::is_same<Period, std::ratio<1> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/euclidian.h b/test/std/utilities/time/time.cal/euclidian.h
index cc7e054ac..de56477ae 100644
--- a/test/std/utilities/time/time.cal/euclidian.h
+++ b/test/std/utilities/time/time.cal/euclidian.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/time/time.cal/nothing_to_do.pass.cpp b/test/std/utilities/time/time.cal/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/time/time.cal/nothing_to_do.pass.cpp
+++ b/test/std/utilities/time/time.cal/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ctor.pass.cpp
index dd36ee574..5c945fab7 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day = std::chrono::day;
 
@@ -43,4 +42,6 @@ int main()
         day day(i);
         assert(static_cast<unsigned>(day) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/decrement.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/decrement.pass.cpp
index a3ac8dc46..f5323f659 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/decrement.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/decrement.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -31,7 +30,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using day = std::chrono::day;
     ASSERT_NOEXCEPT(--(std::declval<day&>())  );
@@ -49,4 +48,6 @@ int main()
         assert(static_cast<unsigned>(day--) == i - 1);
         assert(static_cast<unsigned>(day)   == i - 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/increment.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/increment.pass.cpp
index aa084e863..0be8c847f 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/increment.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -31,7 +30,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using day = std::chrono::day;
     ASSERT_NOEXCEPT(++(std::declval<day&>())  );
@@ -49,4 +48,6 @@ int main()
         assert(static_cast<unsigned>(day++) == i + 1);
         assert(static_cast<unsigned>(day)   == i + 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ok.pass.cpp
index 54b18e34b..131df7533 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day = std::chrono::day;
     ASSERT_NOEXCEPT(                std::declval<const day>().ok());
@@ -34,4 +33,6 @@ int main()
         assert(day{i}.ok());
     for (unsigned i = 32; i <= 255; ++i)
         assert(!day{i}.ok());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/plus_minus_equal.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/plus_minus_equal.pass.cpp
index aed46e7d7..d182d6c92 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/plus_minus_equal.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/plus_minus_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using day  = std::chrono::day;
     using days = std::chrono::days;
@@ -54,4 +53,6 @@ int main()
         assert(static_cast<unsigned>(day -= days{12}) == i + 10);
         assert(static_cast<unsigned>(day)             == i + 10);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/comparisons.pass.cpp
index 1047e1bc3..75bc4cf52 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using day = std::chrono::day;
 
@@ -41,4 +40,6 @@ int main()
     for (unsigned i = 1; i < 10; ++i)
         for (unsigned j = 1; j < 10; ++j)
             assert(testComparisons6Values<day>(i, j));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp
index 350a84635..6331bcf1b 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day = std::chrono::day;
     day d1 = 4d; // expected-error-re {{no matching literal operator for call to 'operator""d' {{.*}}}}
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
index 765b0e8dc..a887736f6 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
@@ -1,13 +1,12 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-5, clang-6
+// UNSUPPORTED: clang-5, clang-6, clang-7
 // UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8, apple-clang-9, apple-clang-10
 
 // <chrono>
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     using namespace std::chrono;
@@ -44,4 +43,6 @@ int main()
     assert (d1 == std::chrono::day(4));
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/minus.pass.cpp
index 47ef42c07..e8ade305a 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -34,7 +33,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using day  = std::chrono::day;
     using days = std::chrono::days;
@@ -55,4 +54,6 @@ int main()
         assert(static_cast<unsigned>(d1) == 12 - i);
         assert(off.count() == static_cast<int>(12 - i)); // days is signed
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/plus.pass.cpp
index b08d6ef4b..e219c7d3c 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -34,7 +33,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using day  = std::chrono::day;
     using days = std::chrono::days;
@@ -56,4 +55,6 @@ int main()
         assert(static_cast<unsigned>(d1) == i + 12);
         assert(static_cast<unsigned>(d2) == i + 12);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/streaming.pass.cpp
index 9c949170a..23ce736c6 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -49,8 +48,10 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
    using day = std::chrono::day;
    std::cout << day{1};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.day/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/types.pass.cpp
index 06b70b0aa..3c26c5753 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day = std::chrono::day;
 
     static_assert(std::is_trivially_copyable_v<day>, "");
     static_assert(std::is_standard_layout_v<day>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.last/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.last/types.pass.cpp
index 5d8512058..084a6aa8d 100644
--- a/test/std/utilities/time/time.cal/time.cal.last/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.last/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using last_spec = std::chrono::last_spec;
 
@@ -30,4 +29,6 @@ int main()
 
     static_assert(std::is_trivially_copyable_v<last_spec>, "");
     static_assert(std::is_standard_layout_v<last_spec>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ctor.pass.cpp
index 743da74ba..48642987a 100644
--- a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day       = std::chrono::day;
     using month     = std::chrono::month;
@@ -44,4 +43,6 @@ int main()
     static_assert( md1.month() == std::chrono::January, "");
     static_assert( md1.day()   == day{4},               "");
     static_assert( md1.ok(),                            "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/day.pass.cpp b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/day.pass.cpp
index 5bc001c47..7137433a9 100644
--- a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/day.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/day.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day       = std::chrono::day;
     using month_day = std::chrono::month_day;
@@ -35,4 +34,6 @@ int main()
         month_day md(std::chrono::March, day{i});
         assert( static_cast<unsigned>(md.day()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/month.pass.cpp
index 96806fda8..b4744e6d4 100644
--- a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day       = std::chrono::day;
     using month     = std::chrono::month;
@@ -36,4 +35,6 @@ int main()
         month_day md(month{i}, day{1});
         assert( static_cast<unsigned>(md.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ok.pass.cpp
index d715635d4..5e4c0082f 100644
--- a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using day       = std::chrono::day;
     using month     = std::chrono::month;
@@ -52,4 +51,6 @@ int main()
 //  If the month is not ok, all the days are bad
     for (unsigned i = 1; i <= 35; ++i)
         assert(!(month_day{month{13}, day{i}}.ok()));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/comparisons.pass.cpp
index c8938be08..d7e535a72 100644
--- a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,7 +26,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using day       = std::chrono::day;
     using month     = std::chrono::month;
@@ -67,4 +66,6 @@ int main()
                 month_day{month{2}, day{j}},
                 i == j, i < j )));
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/streaming.pass.cpp
index 46ae31aaf..8eef5f030 100644
--- a/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.md/time.cal.md.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -32,10 +31,12 @@
 #include <iostream>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_day = std::chrono::month_day;
     using month     = std::chrono::month;
     using day       = std::chrono::day;
     std::cout << month_day{month{1}, day{1}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.md/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.md/types.pass.cpp
index 988e43323..507855a99 100644
--- a/test/std/utilities/time/time.cal/time.cal.md/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.md/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_day = std::chrono::month_day;
 
     static_assert(std::is_trivially_copyable_v<month_day>, "");
     static_assert(std::is_standard_layout_v<month_day>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mdlast/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mdlast/comparisons.pass.cpp
index c3bc1777d..265e7be37 100644
--- a/test/std/utilities/time/time.cal/time.cal.mdlast/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mdlast/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month          = std::chrono::month;
     using month_day_last = std::chrono::month_day_last;
@@ -40,4 +39,6 @@ int main()
     for (unsigned i = 1; i < 12; ++i)
         for (unsigned j = 1; j < 12; ++j)
             assert((testComparisons6Values<month_day_last>(month{i}, month{j})));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mdlast/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mdlast/ctor.pass.cpp
index 5ae329440..3696bb907 100644
--- a/test/std/utilities/time/time.cal/time.cal.mdlast/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mdlast/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month     = std::chrono::month;
     using month_day_last = std::chrono::month_day_last;
@@ -38,4 +37,6 @@ int main()
     constexpr month_day_last md1{std::chrono::January};
     static_assert( md1.month() == std::chrono::January, "");
     static_assert( md1.ok(),                            "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mdlast/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mdlast/month.pass.cpp
index 421f9e7b0..6bf75892d 100644
--- a/test/std/utilities/time/time.cal/time.cal.mdlast/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mdlast/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month     = std::chrono::month;
     using month_day_last = std::chrono::month_day_last;
@@ -35,4 +34,6 @@ int main()
         month_day_last mdl(month{i});
         assert( static_cast<unsigned>(mdl.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mdlast/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mdlast/ok.pass.cpp
index 85955c819..730ab3b25 100644
--- a/test/std/utilities/time/time.cal/time.cal.mdlast/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mdlast/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month          = std::chrono::month;
     using month_day_last = std::chrono::month_day_last;
@@ -43,4 +42,6 @@ int main()
         month_day_last mdl{month{i}};
         assert(!mdl.ok());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mdlast/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mdlast/streaming.pass.cpp
index 3c2da00e8..1b4a8f108 100644
--- a/test/std/utilities/time/time.cal/time.cal.mdlast/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mdlast/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,9 +25,11 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_day_last = std::chrono::month_day_last;
     using month          = std::chrono::month;
     std::cout << month_day_last{month{1}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mdlast/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mdlast/types.pass.cpp
index de15cabd0..c6eebc42d 100644
--- a/test/std/utilities/time/time.cal/time.cal.mdlast/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mdlast/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,10 +17,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_day_last = std::chrono::month_day_last;
 
     static_assert(std::is_trivially_copyable_v<month_day_last>, "");
     static_assert(std::is_standard_layout_v<month_day_last>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ctor.pass.cpp
index 5e86f58ec..6800a03e1 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month = std::chrono::month;
 
@@ -43,4 +42,6 @@ int main()
         month m(i);
         assert(static_cast<unsigned>(m) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/decrement.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/decrement.pass.cpp
index b6d4848fb..6d7edc508 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/decrement.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/decrement.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -31,7 +30,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using month = std::chrono::month;
 
@@ -50,4 +49,6 @@ int main()
         assert(static_cast<unsigned>(month--) == i - 1);
         assert(static_cast<unsigned>(month)   == i - 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/increment.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/increment.pass.cpp
index 2309490ab..7bcd5bed7 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/increment.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -31,7 +30,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using month = std::chrono::month;
     ASSERT_NOEXCEPT(++(std::declval<month&>())  );
@@ -49,4 +48,6 @@ int main()
         assert(static_cast<unsigned>(month++) == i + 1);
         assert(static_cast<unsigned>(month)   == i + 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ok.pass.cpp
index 3382a6378..a001c74a3 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month = std::chrono::month;
 
@@ -35,4 +34,6 @@ int main()
         assert(month{i}.ok());
     for (unsigned i = 13; i <= 255; ++i)
         assert(!month{i}.ok());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/plus_minus_equal.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/plus_minus_equal.pass.cpp
index 1e5a045ed..a792072af 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/plus_minus_equal.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.members/plus_minus_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using month  = std::chrono::month;
     using months = std::chrono::months;
@@ -64,4 +63,6 @@ int main()
         assert(static_cast<unsigned>(month -= months{ 9}) == static_cast<unsigned>(exp));
         assert(static_cast<unsigned>(month)               == static_cast<unsigned>(exp));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/comparisons.pass.cpp
index 21c6e0027..f69fec8aa 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,7 +26,7 @@
 #include "test_comparisons.h"
 
 
-int main()
+int main(int, char**)
 {
     using month = std::chrono::month;
 
@@ -44,4 +43,6 @@ int main()
     for (unsigned i = 1; i < 10; ++i)
         for (unsigned j = 10; j < 10; ++j)
             assert(testComparisons6Values<month>(i, j));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/literals.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/literals.pass.cpp
index 2721a9766..9832fe376 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/literals.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/literals.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -30,7 +29,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 
     ASSERT_SAME_TYPE(const std::chrono::month, decltype(std::chrono::January));
@@ -84,4 +83,6 @@ int main()
     assert(static_cast<unsigned>(std::chrono::October)   == 10);
     assert(static_cast<unsigned>(std::chrono::November)  == 11);
     assert(static_cast<unsigned>(std::chrono::December)  == 12);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/minus.pass.cpp
index 1329a9f95..cda364127 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -45,7 +44,7 @@ constexpr bool testConstexpr()
 
 #include <iostream>
 
-int main()
+int main(int, char**)
 {
     using month  = std::chrono::month;
     using months = std::chrono::months;
@@ -69,4 +68,6 @@ static_assert(testConstexpr<month, months>(), "");
         assert(static_cast<unsigned>(m1) == static_cast<unsigned>(exp));
 //          assert(off.count()               == static_cast<unsigned>(exp));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/plus.pass.cpp
index 749635f81..58a951e1b 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -44,7 +43,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using month  = std::chrono::month;
     using months = std::chrono::months;
@@ -69,4 +68,6 @@ int main()
         assert(static_cast<unsigned>(m1) == exp);
         assert(static_cast<unsigned>(m2) == exp);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/streaming.pass.cpp
index abc2c1edc..1d3aa7ce4 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/time.cal.month.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -46,8 +45,10 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
    using month = std::chrono::month;
    std::cout << month{1};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.month/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.month/types.pass.cpp
index af7532c7b..a6e67f101 100644
--- a/test/std/utilities/time/time.cal/time.cal.month/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.month/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month = std::chrono::month;
 
     static_assert(std::is_trivially_copyable_v<month>, "");
     static_assert(std::is_standard_layout_v<month>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ctor.pass.cpp
index 445b86dde..8804e71e3 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday   = std::chrono::month_weekday;
     using month           = std::chrono::month;
@@ -43,4 +42,6 @@ int main()
     static_assert( md1.month() == std::chrono::January,                              "");
     static_assert( md1.weekday_indexed() == weekday_indexed{std::chrono::Friday, 4}, "");
     static_assert( md1.ok(),                                                         "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/month.pass.cpp
index f915b6deb..35e7c83c7 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday   = std::chrono::month_weekday;
     using month           = std::chrono::month;
@@ -39,4 +38,6 @@ int main()
         month_weekday md(month{i}, weekday_indexed{Sunday, 1});
         assert( static_cast<unsigned>(md.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ok.pass.cpp
index 11d9e2876..2ff1bf735 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday   = std::chrono::month_weekday;
     using month           = std::chrono::month;
@@ -48,4 +47,6 @@ int main()
 //  If the month is not ok, all the weekday_indexed are bad
     for (unsigned i = 1; i <= 10; ++i)
         assert(!(month_weekday{month{13}, weekday_indexed{Sunday, i}}.ok()));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/weekday_indexed.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/weekday_indexed.pass.cpp
index 3eb67259c..13a1bba53 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/weekday_indexed.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.members/weekday_indexed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday   = std::chrono::month_weekday;
     using month           = std::chrono::month;
@@ -40,4 +39,6 @@ int main()
         assert( static_cast<unsigned>(md.weekday_indexed().weekday() == Sunday));
         assert( static_cast<unsigned>(md.weekday_indexed().index() == i));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/comparisons.pass.cpp
index 21779843a..46f756de0 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday   = std::chrono::month_weekday;
     using month           = std::chrono::month;
@@ -83,4 +82,6 @@ int main()
                 month_weekday{month{2}, weekday_indexed{weekday{i}, 2}},
                 month_weekday{month{2}, weekday_indexed{weekday{j}, 2}},
                 i == j)));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/streaming.pass.cpp
index 3858731f5..11a1d4ecd 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday   = std::chrono::month_weekday;
     using month           = std::chrono::month;
@@ -33,4 +32,6 @@ int main()
     using weekday         = std::chrono::weekday;
 
     std::cout << month_weekday{month{1}, weekday_indexed{weekday{3}, 3}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwd/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwd/types.pass.cpp
index 86479d8ca..bd4f4e1d4 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwd/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwd/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday = std::chrono::month_weekday;
 
     static_assert(std::is_trivially_copyable_v<month_weekday>, "");
     static_assert(std::is_standard_layout_v<month_weekday>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ctor.pass.cpp
index 2dd64eb80..d83bbe92f 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -28,7 +27,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month              = std::chrono::month;
     using weekday            = std::chrono::weekday;
@@ -57,4 +56,6 @@ int main()
     static_assert( mwdl3.month() == January,                         "");
     static_assert( mwdl3.weekday_last() == weekday_last{weekday{4}}, "");
     static_assert( mwdl3.ok(),                                       "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/month.pass.cpp
index 155e030ff..a32b08996 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month              = std::chrono::month;
     using weekday            = std::chrono::weekday;
@@ -39,4 +38,6 @@ int main()
         month_weekday_last mdl(month{i}, weekday_last{Tuesday});
         assert( static_cast<unsigned>(mdl.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ok.pass.cpp
index b464fec33..02df5fbd2 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month              = std::chrono::month;
     using weekday            = std::chrono::weekday;
@@ -49,4 +48,6 @@ int main()
         month_weekday_last mwdl{January, weekday_last{weekday{i}}};
         assert( mwdl.ok() == weekday_last{weekday{i}}.ok());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/weekday_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/weekday_last.pass.cpp
index 1a687d962..4ecf6d246 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/weekday_last.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.members/weekday_last.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month              = std::chrono::month;
     using weekday            = std::chrono::weekday;
@@ -41,4 +40,6 @@ int main()
         month_weekday_last mdl(January, weekday_last{weekday{i}});
         assert( static_cast<unsigned>(mdl.weekday_last().weekday()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/comparisons.pass.cpp
index b3cd5ec2b..911693c25 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,7 +24,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month              = std::chrono::month;
     using weekday_last       = std::chrono::weekday_last;
@@ -70,4 +69,6 @@ int main()
             month_weekday_last{month{1}, weekday_last{weekday{1}}},
             month_weekday_last{month{2}, weekday_last{weekday{2}}},
         false)));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/streaming.pass.cpp
index 4e06812e0..75654b1b3 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday_last = std::chrono::month_weekday_last;
     using month              = std::chrono::month;
@@ -34,4 +33,6 @@ int main()
     using weekday_last       = std::chrono::weekday_last;
 
     std::cout << month_weekday_last{month{1}, weekday_last{weekday{3}}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.mwdlast/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.mwdlast/types.pass.cpp
index 43982f4b4..2f2676d7a 100644
--- a/test/std/utilities/time/time.cal/time.cal.mwdlast/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.mwdlast/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -18,10 +17,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday_last = std::chrono::month_weekday_last;
 
     static_assert(std::is_trivially_copyable_v<month_weekday_last>, "");
     static_assert(std::is_standard_layout_v<month_weekday_last>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/month_day.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/month_day.pass.cpp
index 146a0f180..e9eb80bfd 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/month_day.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/month_day.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -39,7 +38,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month_day = std::chrono::month_day;
     using month     = std::chrono::month;
@@ -105,4 +104,6 @@ int main()
                 assert(md1 == md2);
             }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/month_day_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/month_day_last.pass.cpp
index f3f39c0dc..84c2c6eaa 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/month_day_last.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/month_day_last.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -47,7 +46,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month          = std::chrono::month;
     using month_day_last = std::chrono::month_day_last;
@@ -104,4 +103,6 @@ int main()
         }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/month_weekday.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/month_weekday.pass.cpp
index 54b494268..60b788de1 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/month_weekday.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/month_weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -45,7 +44,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday   = std::chrono::month_weekday;
     using month           = std::chrono::month;
@@ -112,4 +111,6 @@ int main()
                     assert(mwd1 == mwd2);
                 }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/month_weekday_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/month_weekday_last.pass.cpp
index 516e0f182..07e5d8d75 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/month_weekday_last.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/month_weekday_last.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -37,7 +36,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month_weekday      = std::chrono::month_weekday;
     using month              = std::chrono::month;
@@ -104,4 +103,6 @@ int main()
                 assert(mwd1 == mwd2);
             }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/year_month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/year_month.pass.cpp
index 62e1c3ace..ba2b5c187 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/year_month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/year_month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month      = std::chrono::month;
     using year       = std::chrono::year;
@@ -65,4 +64,6 @@ int main()
                 assert(static_cast<unsigned>(ym.month()) == j);
             }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/year_month_day.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/year_month_day.pass.cpp
index d2dfc1321..a5aa4d0ef 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/year_month_day.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/year_month_day.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -43,7 +42,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -188,4 +187,6 @@ int main()
                 }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/year_month_day_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/year_month_day_last.pass.cpp
index dc884638d..fd55e38b4 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/year_month_day_last.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/year_month_day_last.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -39,7 +38,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using month               = std::chrono::month;
     using year_month          = std::chrono::year_month;
@@ -122,4 +121,6 @@ int main()
                 assert(ymdl1 == ymdl2);
             }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday.pass.cpp
index 56d88ca7c..4e7143580 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -38,7 +37,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using year_month         = std::chrono::year_month;
@@ -142,4 +141,6 @@ int main()
                         assert(ymd1 == ymd2);
                     }
      }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday_last.pass.cpp
index 84ea86c22..62b1f4676 100644
--- a/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday_last.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.operators/year_month_weekday_last.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -40,7 +39,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using year_month         = std::chrono::year_month;
     using year               = std::chrono::year;
@@ -150,4 +149,6 @@ int main()
                     assert(ymwdl1 == ymwdl2);
                 }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ctor.pass.cpp
index 7a9cfd2d6..4a64b932b 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,7 +26,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday  = std::chrono::weekday;
     using weekday_indexed = std::chrono::weekday_indexed;
@@ -58,4 +57,6 @@ int main()
         weekday_indexed wdi(std::chrono::Tuesday, i);
         assert(!wdi.ok());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/index.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/index.pass.cpp
index 5a29087f2..4942f7164 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/index.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday         = std::chrono::weekday;
     using weekday_indexed = std::chrono::weekday_indexed;
@@ -35,4 +34,6 @@ int main()
         weekday_indexed wdi(weekday{2}, i);
         assert( static_cast<unsigned>(wdi.index()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ok.pass.cpp
index e711426cd..a2b5b48e4 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday         = std::chrono::weekday;
     using weekday_indexed = std::chrono::weekday_indexed;
@@ -46,4 +45,6 @@ int main()
 
 //  Not a valid weekday
     assert(!(weekday_indexed(weekday{9U}, 1).ok()));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/weekday.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/weekday.pass.cpp
index da975ffc4..e9c204d08 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/weekday.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.members/weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday         = std::chrono::weekday;
     using weekday_indexed = std::chrono::weekday_indexed;
@@ -36,4 +35,6 @@ int main()
         weekday_indexed wdi(weekday{i}, 2);
         assert( static_cast<unsigned>(wdi.weekday()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/comparisons.pass.cpp
index 2381322fa..104c59abf 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using weekday         = std::chrono::weekday;
     using weekday_indexed = std::chrono::weekday_indexed;
@@ -45,4 +44,6 @@ int main()
     static_assert( (weekday_indexed{weekday{1}, 2} != weekday_indexed{weekday{1}, 1}), "");
     static_assert(!(weekday_indexed{weekday{1}, 2} == weekday_indexed{weekday{2}, 2}),  "");
     static_assert( (weekday_indexed{weekday{1}, 2} != weekday_indexed{weekday{2}, 2}),  "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/streaming.pass.cpp
index 0e5f77dd7..5052a1824 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,10 +26,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday_indexed = std::chrono::weekday_indexed;
     using weekday         = std::chrono::weekday;
 
     std::cout << weekday_indexed{weekday{3}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdidx/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdidx/types.pass.cpp
index a21ae0dc5..260b50f46 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdidx/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdidx/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday_indexed = std::chrono::weekday_indexed;
 
     static_assert(std::is_trivially_copyable_v<weekday_indexed>, "");
     static_assert(std::is_standard_layout_v<weekday_indexed>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ctor.pass.cpp
index 1ea5196ad..a569144d0 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday      = std::chrono::weekday;
     using weekday_last = std::chrono::weekday_last;
@@ -44,4 +43,6 @@ int main()
         weekday_last wdl{weekday{i}};
         assert(wdl.weekday() == weekday{i});
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ok.pass.cpp
index 4bd0f6c2c..eb0636aa9 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday      = std::chrono::weekday;
     using weekday_last = std::chrono::weekday_last;
@@ -34,4 +33,6 @@ int main()
 
     for (unsigned i = 0; i <= 255; ++i)
         assert(weekday_last{weekday{i}}.ok() == weekday{i}.ok());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/weekday.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/weekday.pass.cpp
index 403ce0cf7..c5eb6e132 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/weekday.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.members/weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday      = std::chrono::weekday;
     using weekday_last = std::chrono::weekday_last;
@@ -30,4 +29,6 @@ int main()
 
     for (unsigned i = 0; i <= 255; ++i)
         assert(weekday_last{weekday{i}}.weekday() == weekday{i});
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/comparisons.pass.cpp
index 59ab4da08..c5ca36e82 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using weekday      = std::chrono::weekday;
     using weekday_last = std::chrono::weekday_last;
@@ -40,4 +39,6 @@ int main()
     for (unsigned i = 0; i < 6; ++i)
         for (unsigned j = 0; j < 6; ++j)
             assert(testComparisons2Values<weekday_last>(weekday{i}, weekday{j}));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/streaming.pass.cpp
index 65d0eed4a..85a40a3dc 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,10 +24,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
    using weekday_last = std::chrono::weekday_last;
    using weekday      = std::chrono::weekday;
 
    std::cout << weekday_last{weekday{3}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.wdlast/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.wdlast/types.pass.cpp
index f6c191329..ff9d54f88 100644
--- a/test/std/utilities/time/time.cal/time.cal.wdlast/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.wdlast/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday_last = std::chrono::weekday_last;
 
     static_assert(std::is_trivially_copyable_v<weekday_last>, "");
     static_assert(std::is_standard_layout_v<weekday_last>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.local_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.local_days.pass.cpp
new file mode 100644
index 000000000..06656fb44
--- /dev/null
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.local_days.pass.cpp
@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+// class weekday;
+
+//  constexpr weekday(const local_days& dp) noexcept;
+//
+//  Effects:  Constructs an object of type weekday by computing what day
+//              of the week  corresponds to the local_days dp, and representing
+//              that day of the week in wd_ 
+//
+//  Remarks: For any value ymd of type year_month_day for which ymd.ok() is true,
+//                ymd == year_month_day{sys_days{ymd}} is true.
+// 
+// [Example: 
+//  If dp represents 1970-01-01, the constructed weekday represents Thursday by storing 4 in wd_.
+// —end example]
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    using local_days = std::chrono::local_days;
+    using days       = std::chrono::days;
+    using weekday    = std::chrono::weekday;
+
+    ASSERT_NOEXCEPT(weekday{std::declval<local_days>()});
+
+    {
+    constexpr local_days sd{}; // 1-Jan-1970 was a Thursday
+    constexpr weekday wd{sd};
+
+    static_assert( wd.ok(), "");
+    static_assert(static_cast<unsigned>(wd) == 4, "");
+    }
+
+    {
+    constexpr local_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday
+    constexpr weekday wd{sd};
+
+    static_assert( wd.ok(), "");
+    static_assert(static_cast<unsigned>(wd) == 3, "");
+    }
+
+
+    {
+    constexpr local_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday
+    constexpr weekday wd{sd};
+
+    static_assert( wd.ok(), "");
+    static_assert(static_cast<unsigned>(wd) == 2, "");
+    }
+
+    {
+    local_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday
+    weekday wd{sd};
+
+    assert( wd.ok());
+    assert(static_cast<unsigned>(wd) == 3);
+    }
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.pass.cpp
index f6bfc2192..470b9d79d 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,7 +26,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
 
@@ -48,4 +47,6 @@ int main()
     }
 
 // TODO - sys_days and local_days ctor tests
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.sys_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.sys_days.pass.cpp
new file mode 100644
index 000000000..e00184a99
--- /dev/null
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ctor.sys_days.pass.cpp
@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+// class weekday;
+
+//  constexpr weekday(const sys_days& dp) noexcept;
+//
+//  Effects:  Constructs an object of type weekday by computing what day
+//              of the week  corresponds to the sys_days dp, and representing
+//              that day of the week in wd_ 
+//
+//  Remarks: For any value ymd of type year_month_day for which ymd.ok() is true,
+//                ymd == year_month_day{sys_days{ymd}} is true.
+// 
+// [Example: 
+//  If dp represents 1970-01-01, the constructed weekday represents Thursday by storing 4 in wd_.
+// —end example]
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    using sys_days  = std::chrono::sys_days;
+    using days      = std::chrono::days;
+    using weekday   = std::chrono::weekday;
+
+    ASSERT_NOEXCEPT(weekday{std::declval<sys_days>()});
+
+    {
+    constexpr sys_days sd{}; // 1-Jan-1970 was a Thursday
+    constexpr weekday wd{sd};
+
+    static_assert( wd.ok(), "");
+    static_assert(static_cast<unsigned>(wd) == 4, "");
+    }
+
+    {
+    constexpr sys_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday
+    constexpr weekday wd{sd};
+
+    static_assert( wd.ok(), "");
+    static_assert(static_cast<unsigned>(wd) == 3, "");
+    }
+
+
+    {
+    constexpr sys_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday
+    constexpr weekday wd{sd};
+
+    static_assert( wd.ok(), "");
+    static_assert(static_cast<unsigned>(wd) == 2, "");
+    }
+
+    {
+    sys_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday
+    weekday wd{sd};
+
+    assert( wd.ok());
+    assert(static_cast<unsigned>(wd) == 3);
+    }
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/decrement.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/decrement.pass.cpp
index 74774b6a0..d574e1db9 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/decrement.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/decrement.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -32,7 +31,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
     ASSERT_NOEXCEPT(--(std::declval<weekday&>())  );
@@ -50,4 +49,6 @@ int main()
         assert((static_cast<unsigned>(wd--) == euclidian_subtraction<unsigned, 0, 6>(i, 1)));
         assert((static_cast<unsigned>(wd)   == euclidian_subtraction<unsigned, 0, 6>(i, 2)));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/increment.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/increment.pass.cpp
index 945d97f49..bb62e0120 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/increment.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -32,7 +31,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
     ASSERT_NOEXCEPT(++(std::declval<weekday&>())  );
@@ -50,4 +49,6 @@ int main()
         assert((static_cast<unsigned>(wd++) == euclidian_addition<unsigned, 0, 6>(i, 1)));
         assert((static_cast<unsigned>(wd)   == euclidian_addition<unsigned, 0, 6>(i, 2)));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ok.pass.cpp
index 5b03b181c..f2f6e2e98 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
 
@@ -35,4 +34,6 @@ int main()
         assert(weekday{i}.ok());
     for (unsigned i = 7; i <= 255; ++i)
         assert(!weekday{i}.ok());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/operator[].pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/operator[].pass.cpp
index 1498d2748..d7d2d6faf 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/operator[].pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/operator[].pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "../../euclidian.h"
 
-int main()
+int main(int, char**)
 {
     using weekday         = std::chrono::weekday;
     using weekday_last    = std::chrono::weekday_last;
@@ -56,4 +55,6 @@ int main()
         assert(wdi.index() == j);
         assert(wdi.ok());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/plus_minus_equal.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/plus_minus_equal.pass.cpp
index 27c14a55a..d99b03493 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/plus_minus_equal.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.members/plus_minus_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -34,7 +33,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
     using days    = std::chrono::days;
@@ -60,4 +59,6 @@ int main()
         assert((static_cast<unsigned>(wd -= days{4}) == euclidian_subtraction<unsigned, 0, 6>(i, 4)));
         assert((static_cast<unsigned>(wd)            == euclidian_subtraction<unsigned, 0, 6>(i, 4)));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/comparisons.pass.cpp
index 0142feee8..982b3bccb 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
 
@@ -39,4 +38,6 @@ int main()
     for (unsigned i = 0; i < 6; ++i)
         for (unsigned j = 0; j < 6; ++j)
             assert(testComparisons2Values<weekday>(i, j));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/literals.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/literals.pass.cpp
index 16f9899d6..7529864a5 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/literals.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/literals.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
 
     ASSERT_SAME_TYPE(const std::chrono::weekday, decltype(std::chrono::Sunday));
@@ -59,4 +58,6 @@ int main()
     assert(static_cast<unsigned>(std::chrono::Thursday)  ==  4);
     assert(static_cast<unsigned>(std::chrono::Friday)    ==  5);
     assert(static_cast<unsigned>(std::chrono::Saturday)  ==  6);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/minus.pass.cpp
index ca126e9dc..f296fc6d6 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -45,7 +44,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using weekday  = std::chrono::weekday;
     using days     = std::chrono::days;
@@ -73,4 +72,6 @@ int main()
             assert(weekday{i} + d == weekday{j});
         }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/plus.pass.cpp
index bb9145a65..78d332b96 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -45,7 +44,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
     using days    = std::chrono::days;
@@ -67,4 +66,6 @@ int main()
             assert((static_cast<unsigned>(wd1) == euclidian_addition<unsigned, 0, 6>(i, j)));
             assert((static_cast<unsigned>(wd2) == euclidian_addition<unsigned, 0, 6>(i, j)));
         }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/streaming.pass.cpp
index cf28397a3..43825b60e 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -48,9 +47,11 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
    using weekday = std::chrono::weekday;
 
    std::cout << weekday{3};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.weekday/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.weekday/types.pass.cpp
index 0a3a89406..7264a210f 100644
--- a/test/std/utilities/time/time.cal/time.cal.weekday/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.weekday/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using weekday = std::chrono::weekday;
 
     static_assert(std::is_trivially_copyable_v<weekday>, "");
     static_assert(std::is_standard_layout_v<weekday>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ctor.pass.cpp
index 904e722db..e46b55630 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year = std::chrono::year;
 
@@ -43,4 +42,6 @@ int main()
         year year(i);
         assert(static_cast<int>(year) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/decrement.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/decrement.pass.cpp
index 810b28d9b..893c48aab 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/decrement.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/decrement.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -31,7 +30,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year = std::chrono::year;
     ASSERT_NOEXCEPT(--(std::declval<year&>())  );
@@ -49,4 +48,6 @@ int main()
         assert(static_cast<int>(year--) == i - 1);
         assert(static_cast<int>(year)   == i - 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/increment.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/increment.pass.cpp
index a6b60d6a0..ef2a6f3fb 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/increment.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/increment.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -31,7 +30,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year = std::chrono::year;
     ASSERT_NOEXCEPT(++(std::declval<year&>())  );
@@ -49,4 +48,6 @@ int main()
         assert(static_cast<int>(year++) == i + 1);
         assert(static_cast<int>(year)   == i + 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/is_leap.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/is_leap.pass.cpp
index 73c0adb98..37031dbba 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/is_leap.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/is_leap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year = std::chrono::year;
 
@@ -50,4 +49,6 @@ int main()
     assert(!year{ 2003}.is_leap());
     assert( year{ 2004}.is_leap());
     assert(!year{ 2100}.is_leap());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ok.pass.cpp
index 5f38b4c8c..f56ee34d5 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year = std::chrono::year;
 
@@ -50,4 +49,6 @@ int main()
     assert(year{ 20001}.ok());
 
     static_assert(!year{-32768}.ok(), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus.pass.cpp
index c74b5f801..0adb0f9fe 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -29,7 +28,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year  = std::chrono::year;
 
@@ -47,4 +46,6 @@ int main()
         assert(static_cast<int>(+year) ==  i);
         assert(static_cast<int>(-year) == -i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus_equal.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus_equal.pass.cpp
index b457b7e91..b79713ed1 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus_equal.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.members/plus_minus_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year  = std::chrono::year;
     using years = std::chrono::years;
@@ -54,4 +53,6 @@ int main()
         assert(static_cast<int>(year -= years{ 9}) == i +  1);
         assert(static_cast<int>(year)              == i +  1);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/comparisons.pass.cpp
index 70bf9e11a..9e84fe36e 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,7 +26,7 @@
 #include "test_comparisons.h"
 
 
-int main()
+int main(int, char**)
 {
     using year = std::chrono::year;
 
@@ -44,4 +43,6 @@ int main()
     for (int i = 1; i < 10; ++i)
         for (int j = 1; j < 10; ++j)
             assert(testComparisons6Values<year>(i, j));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp
index 1d757ec08..50c7b7bc0 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -21,8 +20,10 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using std::chrono::year;
     year d1 = 1234y; // expected-error-re {{no matching literal operator for call to 'operator""y' {{.*}}}}
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
index 7972e4e94..a2bec73e6 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
@@ -1,13 +1,12 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// UNSUPPORTED: clang-5, clang-6
+// UNSUPPORTED: clang-5, clang-6, clang-7
 // UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8, apple-clang-9, apple-clang-10
 
 // <chrono>
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     using namespace std::chrono;
@@ -41,4 +40,6 @@ int main()
     std::chrono::year y1 = 2020y;
     assert (y1 == std::chrono::year(2020));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/minus.pass.cpp
index 04cf9f617..f112345c0 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -38,7 +37,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year  = std::chrono::year;
     using years = std::chrono::years;
@@ -59,4 +58,6 @@ int main()
         assert(static_cast<int>(y1) == 1223 - i);
         assert(ys1.count()          == 1223 - i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/plus.pass.cpp
index dfb3c5f98..d73f6fc88 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -34,7 +33,7 @@ constexpr bool testConstexpr()
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year  = std::chrono::year;
     using years = std::chrono::years;
@@ -56,4 +55,6 @@ int main()
         assert(static_cast<int>(y1) == i + 1223);
         assert(static_cast<int>(y2) == i + 1223);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/streaming.pass.cpp
index 4bc92df21..1b278f2b9 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -47,9 +46,11 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
    using year = std::chrono::year;
 
    std::cout << year{2018};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.year/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/types.pass.cpp
index 92094b0c2..2acb0f104 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year = std::chrono::year;
 
     static_assert(std::is_trivially_copyable_v<year>, "");
     static_assert(std::is_standard_layout_v<year>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ctor.pass.cpp
index 4a1cc9087..1c05cf7a6 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year       = std::chrono::year;
     using month      = std::chrono::month;
@@ -49,4 +48,6 @@ int main()
     static_assert( ym2.year()  == year{2018}, "");
     static_assert( ym2.month() == month{},    "");
     static_assert(!ym2.ok(),                  "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/month.pass.cpp
index 7a6dba18b..7e0cd17f4 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year       = std::chrono::year;
     using month      = std::chrono::month;
@@ -36,4 +35,6 @@ int main()
         year_month ym(year{1234}, month{i});
         assert( static_cast<unsigned>(ym.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ok.pass.cpp
index 7e84b37ab..463289ee4 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using month      = std::chrono::month;
     using year       = std::chrono::year;
@@ -47,4 +46,6 @@ int main()
         year_month ym{year{i}, January};
         assert( ym.ok() == year{i}.ok());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_month.pass.cpp
index 44648c4a0..a403462ff 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using month      = std::chrono::month;
     using months     = std::chrono::months;
@@ -61,4 +60,6 @@ int main()
         assert(static_cast<unsigned>((ym             ).month()) == i + 1);
         assert(ym.year() == y);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_year.pass.cpp
index 073a28656..adf08fc24 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/plus_minus_equal_year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using month      = std::chrono::month;
     using year       = std::chrono::year;
@@ -62,4 +61,6 @@ int main()
         assert(static_cast<int>((ym            ).year()) == i + 1);
         assert(ym.month() == m);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/year.pass.cpp
index 88e28026a..024f31404 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.members/year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year       = std::chrono::year;
     using month      = std::chrono::month;
@@ -36,4 +35,6 @@ int main()
         year_month ym(year{i}, month{});
         assert( static_cast<int>(ym.year()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/comparisons.pass.cpp
index d0c8d1e8c..d102b0a56 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,7 +26,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using year       = std::chrono::year;
     using month      = std::chrono::month;
@@ -66,4 +65,6 @@ int main()
             year_month{year{i}, std::chrono::January},
             year_month{year{j}, std::chrono::January},
             i == j, i < j )));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/minus.pass.cpp
index 1f77811ac..d7756d10d 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -30,7 +29,7 @@
 
 #include <iostream>
 
-int main()
+int main(int, char**)
 {
     using year       = std::chrono::year;
     using years      = std::chrono::years;
@@ -87,4 +86,6 @@ int main()
 //  TODO: different year
 
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/plus.pass.cpp
index 67616764d..5698e7244 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -52,7 +51,7 @@ constexpr bool testConstexprMonths(std::chrono::year_month ym)
 }
 
 
-int main()
+int main(int, char**)
 {
     using year       = std::chrono::year;
     using years      = std::chrono::years;
@@ -103,4 +102,6 @@ int main()
         assert(ym1 == ym2);
     }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/streaming.pass.cpp
index 8679c9612..43af6c2f7 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -47,11 +46,13 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month = std::chrono::year_month;
     using year       = std::chrono::year;
     using month      = std::chrono::month;
 
     std::cout << year_month{year{2018}, month{3}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ym/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ym/types.pass.cpp
index 200e2874d..2e88c6bb6 100644
--- a/test/std/utilities/time/time.cal/time.cal.ym/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ym/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month = std::chrono::year_month;
 
     static_assert(std::is_trivially_copyable_v<year_month>, "");
     static_assert(std::is_standard_layout_v<year_month>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.local_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.local_days.pass.cpp
index f3321d508..274cb6a26 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.local_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.local_days.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_day;
@@ -31,14 +29,58 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
-    using month          = std::chrono::month;
     using day            = std::chrono::day;
-//  using local_days     = std::chrono::local_days;
+    using local_days     = std::chrono::local_days;
+    using days           = std::chrono::days;
     using year_month_day = std::chrono::year_month_day;
 
-//  ASSERT_NOEXCEPT(year_month_day{std::declval<const local_days>()});
-    assert(false);
+    ASSERT_NOEXCEPT(year_month_day{std::declval<local_days>()});
+
+    {
+    constexpr local_days sd{};
+    constexpr year_month_day ymd{sd};
+
+    static_assert( ymd.ok(),                            "");
+    static_assert( ymd.year()  == year{1970},           "");
+    static_assert( ymd.month() == std::chrono::January, "");
+    static_assert( ymd.day()   == day{1},               "");
+    }
+
+    {
+    constexpr local_days sd{days{10957+32}};
+    constexpr year_month_day ymd{sd};
+
+    static_assert( ymd.ok(),                             "");
+    static_assert( ymd.year()  == year{2000},            "");
+    static_assert( ymd.month() == std::chrono::February, "");
+    static_assert( ymd.day()   == day{2},                "");
+    }
+
+
+//  There's one more leap day between 1/1/40 and 1/1/70
+//  when compared to 1/1/70 -> 1/1/2000
+    {
+    constexpr local_days sd{days{-10957}};
+    constexpr year_month_day ymd{sd};
+
+    static_assert( ymd.ok(),                            "");
+    static_assert( ymd.year()  == year{1940},           "");
+    static_assert( ymd.month() == std::chrono::January, "");
+    static_assert( ymd.day()   == day{2},               "");
+    }
+
+    {
+    local_days sd{days{-(10957+34)}};
+    year_month_day ymd{sd};
+
+    assert( ymd.ok());
+    assert( ymd.year()  == year{1939});
+    assert( ymd.month() == std::chrono::November);
+    assert( ymd.day()   == day{29});
+    }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.pass.cpp
index e2e0ac38c..fdef9517e 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -29,7 +28,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -53,4 +52,6 @@ int main()
     static_assert( ym1.day()   == day{12},    "");
     static_assert( ym1.ok(),                  "");
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.sys_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.sys_days.pass.cpp
index d2e268d7d..433468477 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.sys_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.sys_days.pass.cpp
@@ -1,21 +1,19 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_day;
 
 //  constexpr year_month_day(const sys_days& dp) noexcept;
 //
-//  Effects:  Constructs an object of type year_month_day that corresponds
-//                to the date represented by dp
+//  Effects:  Constructs an object of type year_month_day that corresponds 
+//                to the date represented by dp.
 //
 //  Remarks: For any value ymd of type year_month_day for which ymd.ok() is true,
 //                ymd == year_month_day{sys_days{ymd}} is true.
@@ -30,15 +28,58 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
-    using month          = std::chrono::month;
     using day            = std::chrono::day;
-//  using sys_days     = std::chrono::sys_days;
+    using sys_days       = std::chrono::sys_days;
+    using days           = std::chrono::days;
     using year_month_day = std::chrono::year_month_day;
 
-//  ASSERT_NOEXCEPT(year_month_day{std::declval<const sys_days>()});
-    assert(false);
+    ASSERT_NOEXCEPT(year_month_day{std::declval<sys_days>()});
+
+    {
+    constexpr sys_days sd{};
+    constexpr year_month_day ymd{sd};
+
+    static_assert( ymd.ok(),                            "");
+    static_assert( ymd.year()  == year{1970},           "");
+    static_assert( ymd.month() == std::chrono::January, "");
+    static_assert( ymd.day()   == day{1},               "");
+    }
+
+    {
+    constexpr sys_days sd{days{10957+32}};
+    constexpr year_month_day ymd{sd};
+
+    static_assert( ymd.ok(),                             "");
+    static_assert( ymd.year()  == year{2000},            "");
+    static_assert( ymd.month() == std::chrono::February, "");
+    static_assert( ymd.day()   == day{2},                "");
+    }
+
+
+//  There's one more leap day between 1/1/40 and 1/1/70
+//  when compared to 1/1/70 -> 1/1/2000
+    {
+    constexpr sys_days sd{days{-10957}};
+    constexpr year_month_day ymd{sd};
+
+    static_assert( ymd.ok(),                            "");
+    static_assert( ymd.year()  == year{1940},           "");
+    static_assert( ymd.month() == std::chrono::January, "");
+    static_assert( ymd.day()   == day{2},               "");
+    }
+
+    {
+    sys_days sd{days{-(10957+34)}};
+    year_month_day ymd{sd};
+
+    assert( ymd.ok());
+    assert( ymd.year()  == year{1939});
+    assert( ymd.month() == std::chrono::November);
+    assert( ymd.day()   == day{29});
+    }
 
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.year_month_day_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.year_month_day_last.pass.cpp
index 2b5fbab1a..d4e8fc83d 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.year_month_day_last.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ctor.year_month_day_last.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_day;
@@ -28,15 +26,56 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
     using day                 = std::chrono::day;
-//  using year_month_day_last = std::chrono::year_month_day_last;
+    using month_day_last = std::chrono::month_day_last;
+    using year_month_day_last = std::chrono::year_month_day_last;
     using year_month_day      = std::chrono::year_month_day;
 
-//  ASSERT_NOEXCEPT(year_month_day{std::declval<const year_month_day_last>()});
-    assert(false);
+    ASSERT_NOEXCEPT(year_month_day{std::declval<const year_month_day_last>()});
+
+    {
+    constexpr year_month_day_last ymdl{year{2019}, month_day_last{month{1}}};
+    constexpr year_month_day ymd{ymdl};
+
+    static_assert( ymd.year()  == year{2019}, "");
+    static_assert( ymd.month() == month{1},   "");
+    static_assert( ymd.day()   == day{31},    "");
+    static_assert( ymd.ok(),                  "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{1970}, month_day_last{month{4}}};
+    constexpr year_month_day ymd{ymdl};
+
+    static_assert( ymd.year()  == year{1970}, "");
+    static_assert( ymd.month() == month{4},   "");
+    static_assert( ymd.day()   == day{30},    "");
+    static_assert( ymd.ok(),                  "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{2000}, month_day_last{month{2}}};
+    constexpr year_month_day ymd{ymdl};
+
+    static_assert( ymd.year()  == year{2000}, "");
+    static_assert( ymd.month() == month{2},   "");
+    static_assert( ymd.day()   == day{29},    "");
+    static_assert( ymd.ok(),                  "");
+    }
+
+    { // Feb 1900 was NOT a leap year.
+    year_month_day_last ymdl{year{1900}, month_day_last{month{2}}};
+    year_month_day ymd{ymdl};
+
+    assert( ymd.year()  == year{1900});
+    assert( ymd.month() == month{2});
+    assert( ymd.day()   == day{28});
+    assert( ymd.ok());
+    }
 
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/day.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/day.pass.cpp
index c46b9ce85..9a068737d 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/day.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/day.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -37,4 +36,6 @@ int main()
         year_month_day ymd(year{1234}, month{2}, day{i});
         assert( static_cast<unsigned>(ymd.day()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/month.pass.cpp
index b3c03041e..f1dd2e689 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -37,4 +36,6 @@ int main()
         year_month_day ymd(year{1234}, month{i}, day{12});
         assert( static_cast<unsigned>(ymd.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ok.pass.cpp
index 529d0d760..cab639b82 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -44,6 +43,37 @@ int main()
 
     static_assert( year_month_day{year{2019},   January, day{1}}.ok(), ""); // All OK
 
+//  Some months have a 31st
+    static_assert( year_month_day{year{2020},   month{ 1}, day{31}}.ok(), "");
+    static_assert(!year_month_day{year{2020},   month{ 2}, day{31}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 3}, day{31}}.ok(), "");
+    static_assert(!year_month_day{year{2020},   month{ 4}, day{31}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 5}, day{31}}.ok(), "");
+    static_assert(!year_month_day{year{2020},   month{ 6}, day{31}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 7}, day{31}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 8}, day{31}}.ok(), "");
+    static_assert(!year_month_day{year{2020},   month{ 9}, day{31}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{10}, day{31}}.ok(), "");
+    static_assert(!year_month_day{year{2020},   month{11}, day{31}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{12}, day{31}}.ok(), "");
+
+//  Everyone except FEB has a 30th
+    static_assert( year_month_day{year{2020},   month{ 1}, day{30}}.ok(), "");
+    static_assert(!year_month_day{year{2020},   month{ 2}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 3}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 4}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 5}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 6}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 7}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 8}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{ 9}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{10}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{11}, day{30}}.ok(), "");
+    static_assert( year_month_day{year{2020},   month{12}, day{30}}.ok(), "");
+
+    static_assert(!year_month_day{year{2019},   std::chrono::February, day{29}}.ok(), ""); // Not a leap year
+    static_assert( year_month_day{year{2020},   std::chrono::February, day{29}}.ok(), ""); // Ok; 2020 is a leap year
+
     for (unsigned i = 0; i <= 50; ++i)
     {
         year_month_day ym{year{2019}, January, day{i}};
@@ -62,4 +92,6 @@ int main()
         year_month_day ym{year{i}, January, day{12}};
         assert( ym.ok() == year{i}.ok());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/op.local_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/op.local_days.pass.cpp
new file mode 100644
index 000000000..038d21c46
--- /dev/null
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/op.local_days.pass.cpp
@@ -0,0 +1,94 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+// class year_month_day;
+
+// constexpr operator local_days() const noexcept;
+//
+// Returns: If ok(), returns a local_days holding a count of days from the
+//   local_days epoch to *this (a negative value if *this represents a date
+//   prior to the sys_days epoch). Otherwise, if y_.ok() && m_.ok() is true,
+//   returns a sys_days which is offset from sys_days{y_/m_/last} by the
+//   number of days d_ is offset from sys_days{y_/m_/last}.day(). Otherwise
+//   the value returned is unspecified.
+//
+// Remarks: A local_days in the range [days{-12687428}, days{11248737}] which
+//   is converted to a year_month_day shall have the same value when
+//   converted back to a sys_days.
+//
+// [Example:
+//   static_assert(year_month_day{local_days{2017y/January/0}}  == 2016y/December/31);
+//   static_assert(year_month_day{local_days{2017y/January/31}} == 2017y/January/31);
+//   static_assert(year_month_day{local_days{2017y/January/32}} == 2017y/February/1);
+// —end example]
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+void RunTheExample()
+{
+    using namespace std::chrono;
+
+    static_assert(year_month_day{local_days{year{2017}/January/0}}  == year{2016}/December/31);
+    static_assert(year_month_day{local_days{year{2017}/January/31}} == year{2017}/January/31);
+    static_assert(year_month_day{local_days{year{2017}/January/32}} == year{2017}/February/1);  
+}
+
+int main(int, char**)
+{
+    using year           = std::chrono::year;
+    using month          = std::chrono::month;
+    using day            = std::chrono::day;
+    using local_days       = std::chrono::local_days;
+    using days           = std::chrono::days;
+    using year_month_day = std::chrono::year_month_day;
+
+    ASSERT_NOEXCEPT(local_days(std::declval<year_month_day>()));
+    RunTheExample();
+
+    {
+    constexpr year_month_day ymd{year{1970}, month{1}, day{1}};
+    constexpr local_days sd{ymd};
+
+    static_assert( sd.time_since_epoch() == days{0}, "");
+    static_assert( year_month_day{sd} == ymd, ""); // and back
+    }
+
+    {
+    constexpr year_month_day ymd{year{2000}, month{2}, day{2}};
+    constexpr local_days sd{ymd};
+
+    static_assert( sd.time_since_epoch() == days{10957+32}, "");
+    static_assert( year_month_day{sd} == ymd, ""); // and back
+    }
+
+//  There's one more leap day between 1/1/40 and 1/1/70
+//  when compared to 1/1/70 -> 1/1/2000
+    {
+    constexpr year_month_day ymd{year{1940}, month{1}, day{2}};
+    constexpr local_days sd{ymd};
+
+    static_assert( sd.time_since_epoch() == days{-10957}, "");
+    static_assert( year_month_day{sd} == ymd, ""); // and back
+    }
+
+    {
+    year_month_day ymd{year{1939}, month{11}, day{29}};
+    local_days sd{ymd};
+
+    assert( sd.time_since_epoch() == days{-(10957+34)});
+    assert( year_month_day{sd} == ymd); // and back
+    }
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/op.sys_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/op.sys_days.pass.cpp
new file mode 100644
index 000000000..a95684550
--- /dev/null
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/op.sys_days.pass.cpp
@@ -0,0 +1,94 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+// class year_month_day;
+
+// constexpr operator sys_days() const noexcept;
+//
+// Returns: If ok(), returns a sys_days holding a count of days from the
+//   sys_days epoch to *this (a negative value if *this represents a date
+//   prior to the sys_days epoch). Otherwise, if y_.ok() && m_.ok() is true,
+//   returns a sys_days which is offset from sys_days{y_/m_/last} by the
+//   number of days d_ is offset from sys_days{y_/m_/last}.day(). Otherwise
+//   the value returned is unspecified.
+//
+// Remarks: A sys_days in the range [days{-12687428}, days{11248737}] which
+//   is converted to a year_month_day shall have the same value when
+//   converted back to a sys_days.
+//
+// [Example:
+//   static_assert(year_month_day{sys_days{2017y/January/0}}  == 2016y/December/31);
+//   static_assert(year_month_day{sys_days{2017y/January/31}} == 2017y/January/31);
+//   static_assert(year_month_day{sys_days{2017y/January/32}} == 2017y/February/1);
+// —end example]
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+void RunTheExample()
+{
+    using namespace std::chrono;
+
+    static_assert(year_month_day{sys_days{year{2017}/January/0}}  == year{2016}/December/31);
+    static_assert(year_month_day{sys_days{year{2017}/January/31}} == year{2017}/January/31);
+    static_assert(year_month_day{sys_days{year{2017}/January/32}} == year{2017}/February/1);  
+}
+
+int main(int, char**)
+{
+    using year           = std::chrono::year;
+    using month          = std::chrono::month;
+    using day            = std::chrono::day;
+    using sys_days       = std::chrono::sys_days;
+    using days           = std::chrono::days;
+    using year_month_day = std::chrono::year_month_day;
+
+    ASSERT_NOEXCEPT(sys_days(std::declval<year_month_day>()));
+    RunTheExample();
+
+    {
+    constexpr year_month_day ymd{year{1970}, month{1}, day{1}};
+    constexpr sys_days sd{ymd};
+
+    static_assert( sd.time_since_epoch() == days{0}, "");
+    static_assert( year_month_day{sd} == ymd, ""); // and back
+    }
+
+    {
+    constexpr year_month_day ymd{year{2000}, month{2}, day{2}};
+    constexpr sys_days sd{ymd};
+
+    static_assert( sd.time_since_epoch() == days{10957+32}, "");
+    static_assert( year_month_day{sd} == ymd, ""); // and back
+    }
+
+//  There's one more leap day between 1/1/40 and 1/1/70
+//  when compared to 1/1/70 -> 1/1/2000
+    {
+    constexpr year_month_day ymd{year{1940}, month{1}, day{2}};
+    constexpr sys_days sd{ymd};
+
+    static_assert( sd.time_since_epoch() == days{-10957}, "");
+    static_assert( year_month_day{sd} == ymd, ""); // and back
+    }
+
+    {
+    year_month_day ymd{year{1939}, month{11}, day{29}};
+    sys_days sd{ymd};
+
+    assert( sd.time_since_epoch() == days{-(10957+34)});
+    assert( year_month_day{sd} == ymd); // and back
+    }
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_month.pass.cpp
index 7cd31222d..8530248d1 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -67,4 +66,6 @@ int main()
         assert(ym.year() == y);
         assert(ym.day()  == d);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_year.pass.cpp
index 650941dc9..ae134d1a2 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/plus_minus_equal_year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -67,4 +66,6 @@ int main()
         assert(ym.month() == m);
         assert(ym.day()   == d);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/year.pass.cpp
index be6aa5c57..fc5a40724 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.members/year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -37,4 +36,6 @@ int main()
         year_month_day ym(year{i}, month{}, day{});
         assert( static_cast<int>(ym.year()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/comparisons.pass.cpp
index 0df684395..0d1558925 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -30,7 +29,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using day        = std::chrono::day;
     using year       = std::chrono::year;
@@ -115,4 +114,6 @@ int main()
             year_month_day{year{i}, January, day{12}},
             year_month_day{year{j}, January, day{12}},
             i == j, i < j )));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/minus.pass.cpp
index 41b61f7b6..3c921def3 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -34,7 +33,7 @@ constexpr bool test_constexpr ()
         ;
 }
 
-int main()
+int main(int, char**)
 {
     using year           = std::chrono::year;
     using month          = std::chrono::month;
@@ -57,4 +56,6 @@ int main()
         assert(ym1.month() == January);
         assert(ym1.day() == day{10});
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/plus.pass.cpp
index c325d1f89..8d5e02543 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -52,7 +51,7 @@ constexpr bool testConstexprMonths(std::chrono::year_month_day ym)
 }
 
 
-int main()
+int main(int, char**)
 {
     using day        = std::chrono::day;
     using year       = std::chrono::year;
@@ -109,4 +108,6 @@ int main()
     }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/streaming.pass.cpp
index 4bfca1549..47b6f0249 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -47,7 +46,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month_day = std::chrono::year_month_day;
     using year           = std::chrono::year;
@@ -55,4 +54,6 @@ int main()
     using day            = std::chrono::day;
 
     std::cout << year_month_day{year{2018}, month{3}, day{12}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymd/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymd/types.pass.cpp
index f13f4da1a..58acd143d 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymd/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymd/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month_day = std::chrono::year_month_day;
 
     static_assert(std::is_trivially_copyable_v<year_month_day>, "");
     static_assert(std::is_standard_layout_v<year_month_day>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ctor.pass.cpp
index e2a6a7acf..bd4729f6a 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -28,7 +27,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -50,4 +49,6 @@ int main()
     static_assert( ymdl1.month()          == January,                 "");
     static_assert( ymdl1.month_day_last() == month_day_last{January}, "");
     static_assert( ymdl1.ok(),                                        "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/day.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/day.pass.cpp
index f68e3239f..2f0e2ba17 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/day.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/day.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_day_last;
@@ -21,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -29,15 +27,26 @@ int main()
     using month_day_last      = std::chrono::month_day_last;
     using year_month_day_last = std::chrono::year_month_day_last;
 
-//  TODO: wait for calendar
-//     ASSERT_NOEXCEPT(               std::declval<const year_month_day_last>().day());
-//     ASSERT_SAME_TYPE(day, decltype(std::declval<const year_month_day_last>().day()));
-//
-//     static_assert( year_month_day_last{}.day() == day{}, "");
+    ASSERT_NOEXCEPT(               std::declval<const year_month_day_last>().day());
+    ASSERT_SAME_TYPE(day, decltype(std::declval<const year_month_day_last>().day()));
+
+//  Some months have a 31st
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 1}}}.day() == day{31}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 2}}}.day() == day{29}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 3}}}.day() == day{31}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 4}}}.day() == day{30}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 5}}}.day() == day{31}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 6}}}.day() == day{30}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 7}}}.day() == day{31}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 8}}}.day() == day{31}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{ 9}}}.day() == day{30}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{10}}}.day() == day{31}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{11}}}.day() == day{30}, "");
+    static_assert( year_month_day_last{year{2020}, month_day_last{month{12}}}.day() == day{31}, "");
+
+    assert((year_month_day_last{year{2019}, month_day_last{month{ 2}}}.day() == day{28}));
+    assert((year_month_day_last{year{2020}, month_day_last{month{ 2}}}.day() == day{29}));
+    assert((year_month_day_last{year{2021}, month_day_last{month{ 2}}}.day() == day{28}));
 
-    for (unsigned i = 1; i <= 12; ++i)
-    {
-        year_month_day_last ymd(year{1234}, month_day_last{month{i}});
-        assert( static_cast<unsigned>(ymd.day()) == i);
-    }
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month.pass.cpp
index 43ec42d94..5b68aa1d9 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -35,4 +34,6 @@ int main()
         year_month_day_last ymd(year{1234}, month_day_last{month{i}});
         assert( static_cast<unsigned>(ymd.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month_day_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month_day_last.pass.cpp
index 613cc1c6b..cca9026b6 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month_day_last.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/month_day_last.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -35,4 +34,6 @@ int main()
         year_month_day_last ymdl(year{1234}, month_day_last{month{i}});
         assert( static_cast<unsigned>(ymdl.month_day_last().month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ok.pass.cpp
index 7b61214b7..d40de103c 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -49,4 +48,6 @@ int main()
         year_month_day_last ym{year{i}, month_day_last{January}};
         assert( ym.ok() == year{i}.ok());
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_local_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_local_days.pass.cpp
index 43a3ef203..a96dff338 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_local_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_local_days.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_day_last;
@@ -21,16 +19,44 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
-    using month               = std::chrono::month;
-    using day                 = std::chrono::day;
     using month_day_last      = std::chrono::month_day_last;
     using year_month_day_last = std::chrono::year_month_day_last;
-//  using sys_days            = std::chrono::local_days;
+    using local_days          = std::chrono::local_days;
+    using days                = std::chrono::days;
+
+    ASSERT_NOEXCEPT(                      static_cast<local_days>(std::declval<const year_month_day_last>()));
+    ASSERT_SAME_TYPE(local_days, decltype(static_cast<local_days>(std::declval<const year_month_day_last>())));
+
+    { // Last day in Jan 1970 was the 31st
+    constexpr year_month_day_last ymdl{year{1970}, month_day_last{std::chrono::January}};
+    constexpr local_days sd{ymdl};
+    
+    static_assert(sd.time_since_epoch() == days{30}, "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{2000}, month_day_last{std::chrono::January}};
+    constexpr local_days sd{ymdl};
+
+    static_assert(sd.time_since_epoch() == days{10957+30}, "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{1940}, month_day_last{std::chrono::January}};
+    constexpr local_days sd{ymdl};
+
+    static_assert(sd.time_since_epoch() == days{-10957+29}, "");
+    }
+
+    {
+    year_month_day_last ymdl{year{1939}, month_day_last{std::chrono::November}};
+    local_days sd{ymdl};
+
+    assert(sd.time_since_epoch() == days{-(10957+33)});
+    }
 
-//  ASSERT_NOEXCEPT(                static_cast<local_days>(std::declval<const year_month_day_last>().year()));
-//  ASSERT_SAME_TYPE(year, decltype(static_cast<local_days>(std::declval<const year_month_day_last>().year()));
-    assert(false);
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_sys_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_sys_days.pass.cpp
index 8c1b3131e..250ca0f11 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_sys_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/op_sys_days.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_day_last;
@@ -21,16 +19,44 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
-    using month               = std::chrono::month;
-    using day                 = std::chrono::day;
     using month_day_last      = std::chrono::month_day_last;
     using year_month_day_last = std::chrono::year_month_day_last;
-//  using sys_days            = std::chrono::sys_days;
+    using sys_days            = std::chrono::sys_days;
+    using days                = std::chrono::days;
+
+    ASSERT_NOEXCEPT(                    static_cast<sys_days>(std::declval<const year_month_day_last>()));
+    ASSERT_SAME_TYPE(sys_days, decltype(static_cast<sys_days>(std::declval<const year_month_day_last>())));
+
+    { // Last day in Jan 1970 was the 31st
+    constexpr year_month_day_last ymdl{year{1970}, month_day_last{std::chrono::January}};
+    constexpr sys_days sd{ymdl};
+    
+    static_assert(sd.time_since_epoch() == days{30}, "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{2000}, month_day_last{std::chrono::January}};
+    constexpr sys_days sd{ymdl};
+
+    static_assert(sd.time_since_epoch() == days{10957+30}, "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{1940}, month_day_last{std::chrono::January}};
+    constexpr sys_days sd{ymdl};
+
+    static_assert(sd.time_since_epoch() == days{-10957+29}, "");
+    }
+
+    {
+    year_month_day_last ymdl{year{1939}, month_day_last{std::chrono::November}};
+    sys_days sd{ymdl};
+
+    assert(sd.time_since_epoch() == days{-(10957+33)});
+    }
 
-//  ASSERT_NOEXCEPT(                static_cast<sys_days>(std::declval<const year_month_day_last>().year()));
-//  ASSERT_SAME_TYPE(year, decltype(static_cast<sys_days>(std::declval<const year_month_day_last>().year()));
-    assert(false);
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_month.pass.cpp
index bfa1d58d9..7091f64ea 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -63,4 +62,6 @@ int main()
         assert(static_cast<unsigned>((ym             ).month()) == i + 1);
         assert(ym.year() == y);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_year.pass.cpp
index ce364d236..3c1ad3527 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/plus_minus_equal_year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -62,4 +61,6 @@ int main()
         assert(static_cast<int>((ymdl            ).year()) == i + 1);
         assert(ymdl.month_day_last() == mdl);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/year.pass.cpp
index 0f4da09dc..c0db150f9 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.members/year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -35,4 +34,6 @@ int main()
         year_month_day_last ym(year{i}, month_day_last{month{}});
         assert( static_cast<int>(ym.year()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/comparisons.pass.cpp
index d4e4a1185..c56491f96 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -27,7 +26,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -84,4 +83,6 @@ int main()
             year_month_day_last{year{i}, month_day_last{January}},
             year_month_day_last{year{j}, month_day_last{January}},
             i == j, i < j )));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/minus.pass.cpp
index 1c8d4e7af..8ea3025d6 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -48,7 +47,7 @@ constexpr bool testConstexprMonths (std::chrono::year_month_day_last ymdl)
         ;
 }
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -88,4 +87,6 @@ int main()
     }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/plus.pass.cpp
index 25ab85d8f..75cabbdcd 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -64,7 +63,7 @@ constexpr bool testConstexprMonths(std::chrono::year_month_day_last ymdl)
 }
 
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
     using month               = std::chrono::month;
@@ -119,4 +118,6 @@ int main()
     }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/streaming.pass.cpp
index 06c752e29..eca8d3d68 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month_day_last = std::chrono::year_month_day_last;
     using year                = std::chrono::year;
@@ -34,4 +33,6 @@ int main()
     using month_day_last      = std::chrono::month_day_last;
 
     std::cout << year_month_day_last{year{2018}, month_day_last{month{3}}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.local_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.local_days.pass.cpp
index dbc3c855a..bb4e7d044 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.local_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.local_days.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_weekday;
@@ -31,14 +29,68 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
-    using year           = std::chrono::year;
-    using month          = std::chrono::month;
-    using day            = std::chrono::day;
-//  using local_days     = std::chrono::local_days;
+    using year               = std::chrono::year;
+    using days               = std::chrono::days;
+    using local_days         = std::chrono::local_days;
+    using weekday_indexed    = std::chrono::weekday_indexed;
     using year_month_weekday = std::chrono::year_month_weekday;
 
-//  ASSERT_NOEXCEPT(year_month_weekday{std::declval<const local_days>()});
-    assert(false);
+    ASSERT_NOEXCEPT(year_month_weekday{std::declval<const local_days>()});
+
+    {
+    constexpr local_days sd{}; // 1-Jan-1970 was a Thursday
+    constexpr year_month_weekday ymwd{sd};
+
+    static_assert( ymwd.ok(),                                                            "");
+    static_assert( ymwd.year()            == year{1970},                                 "");
+    static_assert( ymwd.month()           == std::chrono::January,                       "");
+    static_assert( ymwd.weekday()         == std::chrono::Thursday,                      "");
+    static_assert( ymwd.index()           == 1,                                          "");
+    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Thursday, 1},  "");
+    static_assert( ymwd                   == year_month_weekday{local_days{ymwd}},       ""); // round trip
+    }
+
+    {
+    constexpr local_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday
+    constexpr year_month_weekday ymwd{sd};
+
+    static_assert( ymwd.ok(),                                                            "");
+    static_assert( ymwd.year()            == year{2000},                                 "");
+    static_assert( ymwd.month()           == std::chrono::February,                      "");
+    static_assert( ymwd.weekday()         == std::chrono::Wednesday,                     "");
+    static_assert( ymwd.index()           == 1,                                          "");
+    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Wednesday, 1}, "");
+    static_assert( ymwd                   == year_month_weekday{local_days{ymwd}},       ""); // round trip
+    }
+
+
+    {
+    constexpr local_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday
+    constexpr year_month_weekday ymwd{sd};
+
+    static_assert( ymwd.ok(),                                                            "");
+    static_assert( ymwd.year()            == year{1940},                                 "");
+    static_assert( ymwd.month()           == std::chrono::January,                       "");
+    static_assert( ymwd.weekday()         == std::chrono::Tuesday,                       "");
+    static_assert( ymwd.index()           == 1,                                          "");
+    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Tuesday, 1},   "");
+    static_assert( ymwd                   == year_month_weekday{local_days{ymwd}},       ""); // round trip
+    }
+
+    {
+    local_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday
+    year_month_weekday ymwd{sd};
+
+    assert( ymwd.ok());
+    assert( ymwd.year()            == year{1939});
+    assert( ymwd.month()           == std::chrono::November);
+    assert( ymwd.weekday()         == std::chrono::Wednesday);
+    assert( ymwd.index()           == 5);
+    assert((ymwd.weekday_indexed() == weekday_indexed{std::chrono::Wednesday, 5}));
+    assert( ymwd                   == year_month_weekday{local_days{ymwd}}); // round trip
+    }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.pass.cpp
index 751de6091..81030ff55 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -31,7 +30,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -61,4 +60,6 @@ int main()
     static_assert( ym1.weekday_indexed() == weekday_indexed{Tuesday, 1}, "");
     static_assert( ym1.ok(),                                             "");
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.sys_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.sys_days.pass.cpp
index 52b3f712f..5ae9900a9 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.sys_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.sys_days.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_weekday;
@@ -30,14 +28,68 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
-    using year           = std::chrono::year;
-    using month          = std::chrono::month;
-    using day            = std::chrono::day;
-//  using sys_days     = std::chrono::sys_days;
+    using year               = std::chrono::year;
+    using days               = std::chrono::days;
+    using sys_days           = std::chrono::sys_days;
+    using weekday_indexed    = std::chrono::weekday_indexed;
     using year_month_weekday = std::chrono::year_month_weekday;
 
-//  ASSERT_NOEXCEPT(year_month_weekday{std::declval<const sys_days>()});
-    assert(false);
+    ASSERT_NOEXCEPT(year_month_weekday{std::declval<const sys_days>()});
+
+    {
+    constexpr sys_days sd{}; // 1-Jan-1970 was a Thursday
+    constexpr year_month_weekday ymwd{sd};
+
+    static_assert( ymwd.ok(),                                                            "");
+    static_assert( ymwd.year()            == year{1970},                                 "");
+    static_assert( ymwd.month()           == std::chrono::January,                       "");
+    static_assert( ymwd.weekday()         == std::chrono::Thursday,                      "");
+    static_assert( ymwd.index()           == 1,                                          "");
+    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Thursday, 1},  "");
+    static_assert( ymwd                   == year_month_weekday{sys_days{ymwd}},         ""); // round trip
+    }
+
+    {
+    constexpr sys_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday
+    constexpr year_month_weekday ymwd{sd};
+
+    static_assert( ymwd.ok(),                                                            "");
+    static_assert( ymwd.year()            == year{2000},                                 "");
+    static_assert( ymwd.month()           == std::chrono::February,                      "");
+    static_assert( ymwd.weekday()         == std::chrono::Wednesday,                     "");
+    static_assert( ymwd.index()           == 1,                                          "");
+    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Wednesday, 1}, "");
+    static_assert( ymwd                   == year_month_weekday{sys_days{ymwd}},         ""); // round trip
+    }
+
+
+    {
+    constexpr sys_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday
+    constexpr year_month_weekday ymwd{sd};
+
+    static_assert( ymwd.ok(),                                                            "");
+    static_assert( ymwd.year()            == year{1940},                                 "");
+    static_assert( ymwd.month()           == std::chrono::January,                       "");
+    static_assert( ymwd.weekday()         == std::chrono::Tuesday,                       "");
+    static_assert( ymwd.index()           == 1,                                          "");
+    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Tuesday, 1},   "");
+    static_assert( ymwd                   == year_month_weekday{sys_days{ymwd}},         ""); // round trip
+    }
+
+    {
+    sys_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday
+    year_month_weekday ymwd{sd};
+
+    assert( ymwd.ok());
+    assert( ymwd.year()            == year{1939});
+    assert( ymwd.month()           == std::chrono::November);
+    assert( ymwd.weekday()         == std::chrono::Wednesday);
+    assert( ymwd.index()           == 5);
+    assert((ymwd.weekday_indexed() == weekday_indexed{std::chrono::Wednesday, 5}));
+    assert( ymwd                   == year_month_weekday{sys_days{ymwd}}); // round trip
+    }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.year_month_day_last.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.year_month_day_last.pass.cpp
deleted file mode 100644
index b873a1956..000000000
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ctor.year_month_day_last.pass.cpp
+++ /dev/null
@@ -1,41 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
-
-// <chrono>
-// class year_month_weekday;
-
-//  constexpr year_month_weekday(const year_month_weekday_last& ymdl) noexcept;
-//
-//  Effects:  Constructs an object of type year_month_weekday by initializing
-//              y_ with ymdl.year(), m_ with ymdl.month(), and d_ with ymdl.day().
-//
-//  constexpr chrono::year   year() const noexcept;
-//  constexpr chrono::month month() const noexcept;
-//  constexpr chrono::day     day() const noexcept;
-//  constexpr bool             ok() const noexcept;
-
-#include <chrono>
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-
-int main()
-{
-    using year                = std::chrono::year;
-    using month               = std::chrono::month;
-    using day                 = std::chrono::day;
-    using year_month_weekday_last = std::chrono::year_month_weekday_last;
-    using year_month_weekday      = std::chrono::year_month_weekday;
-
-    ASSERT_NOEXCEPT(year_month_weekday{std::declval<const year_month_weekday_last>()});
-
-}
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/index.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/index.pass.cpp
index 5a29b8218..ecbd8aec8 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/index.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -38,4 +37,6 @@ int main()
         year_month_weekday ymwd0(year{1234}, month{2}, weekday_indexed{weekday{2}, i});
         assert(ymwd0.index() == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/month.pass.cpp
index 5749da9af..c300fd5d3 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -37,4 +36,6 @@ int main()
         year_month_weekday ymd(year{1234}, month{i}, weekday_indexed{});
         assert( static_cast<unsigned>(ymd.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ok.pass.cpp
index 97f898986..7e8599e05 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -72,4 +71,6 @@ int main()
         year_month_weekday ym{year{i}, January, weekday_indexed{Tuesday, 1}};
         assert((ym.ok() == year{i}.ok()));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/op.local_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/op.local_days.pass.cpp
new file mode 100644
index 000000000..e86e5b0fa
--- /dev/null
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/op.local_days.pass.cpp
@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+// class year_month_weekday;
+
+// explicit constexpr operator local_days() const noexcept;
+//
+// Returns: If y_.ok() && m_.ok() && wdi_.weekday().ok(), returns a
+//    sys_days that represents the date (index() - 1) * 7 days after the first
+//    weekday() of year()/month(). If index() is 0 the returned sys_days
+//    represents the date 7 days prior to the first weekday() of
+//    year()/month(). Otherwise the returned value is unspecified.
+//
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    using year               = std::chrono::year;
+    using month              = std::chrono::month;
+    using weekday_indexed    = std::chrono::weekday_indexed;
+    using local_days         = std::chrono::local_days;
+    using days               = std::chrono::days;
+    using year_month_weekday = std::chrono::year_month_weekday;
+
+    ASSERT_NOEXCEPT(local_days(std::declval<year_month_weekday>()));
+
+    {
+    constexpr year_month_weekday ymwd{year{1970}, month{1}, weekday_indexed{std::chrono::Thursday, 1}};
+    constexpr local_days sd{ymwd};
+
+    static_assert( sd.time_since_epoch() == days{0}, "");
+    static_assert( year_month_weekday{sd} == ymwd, ""); // and back
+    }
+
+    {
+    constexpr year_month_weekday ymwd{year{2000}, month{2}, weekday_indexed{std::chrono::Wednesday, 1}};
+    constexpr local_days sd{ymwd};
+
+    static_assert( sd.time_since_epoch() == days{10957+32}, "");
+    static_assert( year_month_weekday{sd} == ymwd, ""); // and back
+    }
+
+//  There's one more leap day between 1/1/40 and 1/1/70
+//  when compared to 1/1/70 -> 1/1/2000
+    {
+    constexpr year_month_weekday ymwd{year{1940}, month{1},weekday_indexed{std::chrono::Tuesday, 1}};
+    constexpr local_days sd{ymwd};
+
+    static_assert( sd.time_since_epoch() == days{-10957}, "");
+    static_assert( year_month_weekday{sd} == ymwd, ""); // and back
+    }
+
+    {
+    year_month_weekday ymwd{year{1939}, month{11}, weekday_indexed{std::chrono::Wednesday, 5}};
+    local_days sd{ymwd};
+
+    assert( sd.time_since_epoch() == days{-(10957+34)});
+    assert( year_month_weekday{sd} == ymwd); // and back
+    }
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/op.sys_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/op.sys_days.pass.cpp
new file mode 100644
index 000000000..afb1d7014
--- /dev/null
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/op.sys_days.pass.cpp
@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+// class year_month_weekday;
+
+// constexpr operator sys_days() const noexcept;
+//
+// Returns: If y_.ok() && m_.ok() && wdi_.weekday().ok(), returns a
+//    sys_days that represents the date (index() - 1) * 7 days after the first
+//    weekday() of year()/month(). If index() is 0 the returned sys_days
+//    represents the date 7 days prior to the first weekday() of
+//    year()/month(). Otherwise the returned value is unspecified.
+//
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    using year               = std::chrono::year;
+    using month              = std::chrono::month;
+    using weekday_indexed    = std::chrono::weekday_indexed;
+    using sys_days           = std::chrono::sys_days;
+    using days               = std::chrono::days;
+    using year_month_weekday = std::chrono::year_month_weekday;
+
+    ASSERT_NOEXCEPT(sys_days(std::declval<year_month_weekday>()));
+
+    {
+    constexpr year_month_weekday ymwd{year{1970}, month{1}, weekday_indexed{std::chrono::Thursday, 1}};
+    constexpr sys_days sd{ymwd};
+
+    static_assert( sd.time_since_epoch() == days{0}, "");
+    static_assert( year_month_weekday{sd} == ymwd, ""); // and back
+    }
+
+    {
+    constexpr year_month_weekday ymwd{year{2000}, month{2}, weekday_indexed{std::chrono::Wednesday, 1}};
+    constexpr sys_days sd{ymwd};
+
+    static_assert( sd.time_since_epoch() == days{10957+32}, "");
+    static_assert( year_month_weekday{sd} == ymwd, ""); // and back
+    }
+
+//  There's one more leap day between 1/1/40 and 1/1/70
+//  when compared to 1/1/70 -> 1/1/2000
+    {
+    constexpr year_month_weekday ymwd{year{1940}, month{1},weekday_indexed{std::chrono::Tuesday, 1}};
+    constexpr sys_days sd{ymwd};
+
+    static_assert( sd.time_since_epoch() == days{-10957}, "");
+    static_assert( year_month_weekday{sd} == ymwd, ""); // and back
+    }
+
+    {
+    year_month_weekday ymwd{year{1939}, month{11}, weekday_indexed{std::chrono::Wednesday, 5}};
+    sys_days sd{ymwd};
+
+    assert( sd.time_since_epoch() == days{-(10957+34)});
+    assert( year_month_weekday{sd} == ymwd); // and back
+    }
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_month.pass.cpp
index c5e101250..fd53279dd 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -77,4 +76,6 @@ int main()
         assert(ymwd.weekday()  == Tuesday);
         assert(ymwd.index()    == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_year.pass.cpp
index 86830249e..cf229febe 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/plus_minus_equal_year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -77,4 +76,6 @@ int main()
         assert(ymwd.weekday()  == Tuesday);
         assert(ymwd.index()    == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday.pass.cpp
index ad9bc6ee6..dac1f7cc0 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -38,4 +37,6 @@ int main()
         year_month_weekday ymwd0(year{1234}, month{2}, weekday_indexed{weekday{i}, 1});
         assert(static_cast<unsigned>(ymwd0.weekday()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday_indexed.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday_indexed.pass.cpp
index 52d918e55..f089a8cb9 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday_indexed.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/weekday_indexed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -42,4 +41,6 @@ int main()
         assert( static_cast<unsigned>(ymwd1.weekday_indexed().weekday()) == 2);
         assert( static_cast<unsigned>(ymwd1.weekday_indexed().index()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/year.pass.cpp
index 5cf1cbaf7..1ead67570 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.members/year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -37,4 +36,6 @@ int main()
         year_month_weekday ym(year{i}, month{1}, weekday_indexed{});
         assert( static_cast<int>(ym.year()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/comparisons.pass.cpp
index fc13709cd..563112722 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -110,4 +109,6 @@ int main()
             year_month_weekday{year{i}, January, weekday_indexed{Tuesday, 1}},
             year_month_weekday{year{j}, January, weekday_indexed{Tuesday, 1}},
             i == j)));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/minus.pass.cpp
index 0b217414c..47cfbea6a 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -51,7 +50,7 @@ constexpr bool testConstexprMonths ()
 }
 
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -97,4 +96,6 @@ int main()
         assert(ym1.index()   == 2);
     }
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/plus.pass.cpp
index 50572c0c4..29df4776e 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -52,7 +51,7 @@ constexpr bool testConstexprMonths(std::chrono::year_month_weekday ym)
 }
 
 
-int main()
+int main(int, char**)
 {
     using year               = std::chrono::year;
     using month              = std::chrono::month;
@@ -117,4 +116,6 @@ int main()
     }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/streaming.pass.cpp
index f985f46ea..411e4335f 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -46,7 +45,7 @@
 #include <iostream>
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month_weekday = std::chrono::year_month_weekday;
     using year                = std::chrono::year;
@@ -54,4 +53,6 @@ int main()
     using weekday             = std::chrono::weekday;
 
     std::cout << year_month_weekday{year{2018}, month{3}, weekday{4}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwd/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwd/types.pass.cpp
index 8969bd32a..76e2e0f23 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwd/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwd/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month_weekday = std::chrono::year_month_weekday;
 
     static_assert(std::is_trivially_copyable_v<year_month_weekday>, "");
     static_assert(std::is_standard_layout_v<year_month_weekday>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ctor.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ctor.pass.cpp
index cd3f112ac..31d2e9ca7 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ctor.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -29,7 +28,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -49,4 +48,6 @@ int main()
     static_assert( ym1.weekday_last() == weekday_last{Tuesday}, "");
     static_assert( ym1.ok(),                                    "");
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/month.pass.cpp
index f0c7ec488..df62d010a 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -38,4 +37,6 @@ int main()
         year_month_weekday_last ymd(year{1234}, month{i}, weekday_last{weekday{}});
         assert( static_cast<unsigned>(ymd.month()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ok.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ok.pass.cpp
index d9443d34b..c18b92670 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ok.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/ok.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -70,4 +69,6 @@ int main()
         year_month_weekday_last ym{year{i}, January, weekday_last{Tuesday}};
         assert((ym.ok() == year{i}.ok()));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_local_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_local_days.pass.cpp
index 56009c422..c663406ee 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_local_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_local_days.pass.cpp
@@ -1,13 +1,11 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
 // class year_month_day_last;
@@ -21,15 +19,44 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                = std::chrono::year;
-    using month               = std::chrono::month;
-    using day                 = std::chrono::day;
     using month_day_last      = std::chrono::month_day_last;
     using year_month_day_last = std::chrono::year_month_day_last;
-    using sys_days            = std::chrono::local_days;
+    using local_days          = std::chrono::local_days;
+    using days                = std::chrono::days;
+
+    ASSERT_NOEXCEPT(                      static_cast<local_days>(std::declval<const year_month_day_last>()));
+    ASSERT_SAME_TYPE(local_days, decltype(static_cast<local_days>(std::declval<const year_month_day_last>())));
+
+    { // Last day in Jan 1970 was the 31st
+    constexpr year_month_day_last ymdl{year{1970}, month_day_last{std::chrono::January}};
+    constexpr local_days sd{ymdl};
+    
+    static_assert(sd.time_since_epoch() == days{30}, "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{2000}, month_day_last{std::chrono::January}};
+    constexpr local_days sd{ymdl};
+
+    static_assert(sd.time_since_epoch() == days{10957+30}, "");
+    }
+
+    {
+    constexpr year_month_day_last ymdl{year{1940}, month_day_last{std::chrono::January}};
+    constexpr local_days sd{ymdl};
+
+    static_assert(sd.time_since_epoch() == days{-10957+29}, "");
+    }
+
+    {
+    year_month_day_last ymdl{year{1939}, month_day_last{std::chrono::November}};
+    local_days sd{ymdl};
+
+    assert(sd.time_since_epoch() == days{-(10957+33)});
+    }
 
-    ASSERT_NOEXCEPT(                static_cast<local_days>(std::declval<const year_month_day_last>().year()));
-    ASSERT_SAME_TYPE(year, decltype(static_cast<local_days>(std::declval<const year_month_day_last>().year()));
+    return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_sys_days.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_sys_days.pass.cpp
index 47beca7d9..cb75842c6 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_sys_days.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/op_sys_days.pass.cpp
@@ -1,19 +1,18 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: *
 
 // <chrono>
-// class year_month_day_last;
+// class year_month_weekday_last;
 
 // constexpr operator sys_days() const noexcept;
-//  Returns: sys_days{year()/month()/day()}.
+//  Returns: If ok() == true, returns a sys_days that represents the last weekday() 
+//             of year()/month(). Otherwise the returned value is unspecified.
 
 #include <chrono>
 #include <type_traits>
@@ -21,16 +20,51 @@
 
 #include "test_macros.h"
 
-int main()
+#include <iostream>
+
+int main(int, char**)
 {
-    using year                = std::chrono::year;
-    using month               = std::chrono::month;
-    using day                 = std::chrono::day;
-    using month_day_last      = std::chrono::month_day_last;
-    using year_month_day_last = std::chrono::year_month_day_last;
-    using sys_days            = std::chrono::sys_days;
+    using year                    = std::chrono::year;
+    using month                   = std::chrono::month;
+    using year_month_weekday_last = std::chrono::year_month_weekday_last;
+    using sys_days                = std::chrono::sys_days;
+    using days                    = std::chrono::days;
+    using weekday                 = std::chrono::weekday;
+    using weekday_last            = std::chrono::weekday_last;
+
+    ASSERT_NOEXCEPT(                    static_cast<sys_days>(std::declval<const year_month_weekday_last>()));
+    ASSERT_SAME_TYPE(sys_days, decltype(static_cast<sys_days>(std::declval<const year_month_weekday_last>())));
+
+    constexpr month   January = std::chrono::January;
+    constexpr weekday Tuesday = std::chrono::Tuesday;
+
+    { // Last Tuesday in Jan 1970 was the 27th
+    constexpr year_month_weekday_last ymwdl{year{1970}, January, weekday_last{Tuesday}};
+    constexpr sys_days sd{ymwdl};
+    
+    static_assert(sd.time_since_epoch() == days{26}, "");
+    }
+
+    { // Last Tuesday in Jan 2000 was the 25th
+    constexpr year_month_weekday_last ymwdl{year{2000}, January, weekday_last{Tuesday}};
+    constexpr sys_days sd{ymwdl};
+    
+    static_assert(sd.time_since_epoch() == days{10957+24}, "");
+    }
+
+    { // Last Tuesday in Jan 1940 was the 30th
+    constexpr year_month_weekday_last ymwdl{year{1940}, January, weekday_last{Tuesday}};
+    constexpr sys_days sd{ymwdl};
+    
+    static_assert(sd.time_since_epoch() == days{-10958+29}, "");
+    }
+
+    { // Last Tuesday in Nov 1939 was the 28th
+    year_month_weekday_last ymdl{year{1939}, std::chrono::November, weekday_last{Tuesday}};
+    sys_days sd{ymdl};
 
-    ASSERT_NOEXCEPT(                static_cast<sys_days>(std::declval<const year_month_day_last>().year()));
-    ASSERT_SAME_TYPE(year, decltype(static_cast<sys_days>(std::declval<const year_month_day_last>().year()));
+    assert(sd.time_since_epoch() == days{-(10957+35)});
+    }
 
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_month.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_month.pass.cpp
index d416f6b2b..b2bb1361b 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_month.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_month.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -72,4 +71,6 @@ int main()
         assert(ymwd.year()     == y);
         assert(ymwd.weekday()  == Tuesday);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_year.pass.cpp
index 8793c659a..8ced182d6 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -33,7 +32,7 @@ constexpr bool testConstexpr(D d1)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -73,4 +72,6 @@ int main()
         assert(ymwd.month()    == January);
         assert(ymwd.weekday()  == Tuesday);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/weekday.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/weekday.pass.cpp
index 83640302f..1de0b8323 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/weekday.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/weekday.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -38,4 +37,6 @@ int main()
         year_month_weekday_last ymwdl(year{1}, month{1}, weekday_last{weekday{i}});
         assert(static_cast<unsigned>(ymwdl.weekday()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/year.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/year.pass.cpp
index fb621afcd..4e9407911 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/year.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/year.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -38,4 +37,6 @@ int main()
         year_month_weekday_last ymwdl(year{i}, month{1}, weekday_last{weekday{}});
         assert(static_cast<int>(ymwdl.year()) == i);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/comparisons.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/comparisons.pass.cpp
index 6af54892a..24074f33c 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/comparisons.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/comparisons.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -23,7 +22,7 @@
 #include "test_macros.h"
 #include "test_comparisons.h"
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -111,4 +110,6 @@ int main()
             year_month_weekday_last{year{i}, January, weekday_last{Tuesday}},
             year_month_weekday_last{year{j}, January, weekday_last{Tuesday}},
             i == j)));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/minus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/minus.pass.cpp
index c0ca34e83..d58c461be 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/minus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/minus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -41,7 +40,7 @@ constexpr bool testConstexprMonths(std::chrono::year_month_weekday_last ym)
     return true;
 }
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -90,4 +89,6 @@ int main()
     }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/plus.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/plus.pass.cpp
index 9f8eb9dc0..fe246cf42 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/plus.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/plus.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -48,7 +47,7 @@ constexpr bool testConstexprMonths(std::chrono::year_month_weekday_last ym)
 }
 
 
-int main()
+int main(int, char**)
 {
     using year                    = std::chrono::year;
     using month                   = std::chrono::month;
@@ -113,4 +112,6 @@ int main()
     }
     }
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/streaming.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/streaming.pass.cpp
index 46b6ebaed..cdfe55f16 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/streaming.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/streaming.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month_weekday_last = std::chrono::year_month_weekday_last;
     using year                    = std::chrono::year;
@@ -35,4 +34,6 @@ int main()
     using weekday_last            = std::chrono::weekday_last;
 
     std::cout << year_month_weekday_last{year{2018}, month{3}, weekday_last{weekday{4}}};
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.cal/time.cal.ymwdlast/types.pass.cpp b/test/std/utilities/time/time.cal/time.cal.ymwdlast/types.pass.cpp
index a7f3f024e..70dea7bf9 100644
--- a/test/std/utilities/time/time.cal/time.cal.ymwdlast/types.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.ymwdlast/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -17,10 +16,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using year_month_weekday_last = std::chrono::year_month_weekday_last;
 
     static_assert(std::is_trivially_copyable_v<year_month_weekday_last>, "");
     static_assert(std::is_standard_layout_v<year_month_weekday_last>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock.req/nothing_to_do.pass.cpp b/test/std/utilities/time/time.clock.req/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/time/time.clock.req/nothing_to_do.pass.cpp
+++ b/test/std/utilities/time/time.clock.req/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/nothing_to_do.pass.cpp b/test/std/utilities/time/time.clock/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/time/time.clock/nothing_to_do.pass.cpp
+++ b/test/std/utilities/time/time.clock/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.file/consistency.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/consistency.pass.cpp
new file mode 100644
index 000000000..165bec2e1
--- /dev/null
+++ b/test/std/utilities/time/time.clock/time.clock.file/consistency.pass.cpp
@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+//
+// TODO: Remove this when filesystem gets integrated into the dylib
+// REQUIRES: c++filesystem
+
+// <chrono>
+
+// file_clock
+
+// check clock invariants
+
+#include <chrono>
+
+template <class T>
+void test(const T &) {}
+
+int main(int, char**)
+{
+    typedef std::chrono::file_clock C;
+    static_assert((std::is_same<C::rep, C::duration::rep>::value), "");
+    static_assert((std::is_same<C::period, C::duration::period>::value), "");
+    static_assert((std::is_same<C::duration, C::time_point::duration>::value), "");
+    static_assert((std::is_same<C::time_point::clock, C>::value), "");
+    static_assert(!C::is_steady, "");
+    test(std::chrono::file_clock::is_steady);
+
+  return 0;
+}
diff --git a/test/std/utilities/time/time.clock/time.clock.file/file_time.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/file_time.pass.cpp
new file mode 100644
index 000000000..61d92381f
--- /dev/null
+++ b/test/std/utilities/time/time.clock/time.clock.file/file_time.pass.cpp
@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+
+// file_time
+
+#include <chrono>
+
+#include "test_macros.h"
+
+template <class Dur>
+void test() {
+  ASSERT_SAME_TYPE(std::chrono::file_time<Dur>, std::chrono::time_point<std::chrono::file_clock, Dur>);
+}
+
+int main(int, char**) {
+  test<std::chrono::nanoseconds>();
+  test<std::chrono::minutes>();
+  test<std::chrono::hours>();
+
+  return 0;
+}
\ No newline at end of file
diff --git a/test/std/utilities/time/time.clock/time.clock.file/now.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/now.pass.cpp
new file mode 100644
index 000000000..79cdf0612
--- /dev/null
+++ b/test/std/utilities/time/time.clock/time.clock.file/now.pass.cpp
@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// TODO: Remove this when filesystem gets integrated into the dylib
+// REQUIRES: c++filesystem
+
+// <chrono>
+
+// file_clock
+
+// static time_point now() noexcept;
+
+#include <chrono>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    typedef std::chrono::file_clock C;
+    ASSERT_NOEXCEPT(C::now());
+
+    C::time_point t1 = C::now();
+    assert(t1.time_since_epoch().count() != 0);
+    assert(C::time_point::min() < t1);
+    assert(C::time_point::max() > t1);
+
+  return 0;
+}
diff --git a/test/std/utilities/time/time.clock/time.clock.file/rep_signed.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/rep_signed.pass.cpp
new file mode 100644
index 000000000..821072e6d
--- /dev/null
+++ b/test/std/utilities/time/time.clock/time.clock.file/rep_signed.pass.cpp
@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// TODO: Remove this when filesystem gets integrated into the dylib
+// REQUIRES: c++filesystem
+
+// <chrono>
+
+// file_clock
+
+// rep should be signed
+
+#include <chrono>
+#include <cassert>
+
+int main(int, char**)
+{
+    static_assert(std::is_signed<std::chrono::file_clock::rep>::value, "");
+    assert(std::chrono::file_clock::duration::min() <
+           std::chrono::file_clock::duration::zero());
+
+  return 0;
+}
diff --git a/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp b/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp
index 47a610f00..1650d3b6b 100644
--- a/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.hires/consistency.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,7 @@
 template <class T>
 void test(const T &) {}
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock C;
     static_assert((std::is_same<C::rep, C::duration::rep>::value), "");
@@ -36,4 +35,6 @@ int main()
     static_assert((std::is_same<C::duration, C::time_point::duration>::value), "");
     static_assert(C::is_steady || !C::is_steady, "");
     test(std::chrono::high_resolution_clock::is_steady);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.hires/now.pass.cpp b/test/std/utilities/time/time.clock/time.clock.hires/now.pass.cpp
index ab67cd838..ddf3ced87 100644
--- a/test/std/utilities/time/time.clock/time.clock.hires/now.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.hires/now.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <chrono>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::high_resolution_clock C;
     C::time_point t1 = C::now();
     assert(t1.time_since_epoch().count() != 0);
     assert(C::time_point::min() < t1);
     assert(C::time_point::max() > t1);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.steady/consistency.pass.cpp b/test/std/utilities/time/time.clock/time.clock.steady/consistency.pass.cpp
index e5e6de260..0797f2cb5 100644
--- a/test/std/utilities/time/time.clock/time.clock.steady/consistency.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.steady/consistency.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@
 template <class T>
 void test(const T &) {}
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::steady_clock C;
     static_assert((std::is_same<C::rep, C::duration::rep>::value), "");
@@ -38,4 +37,6 @@ int main()
     static_assert((std::is_same<C::duration, C::time_point::duration>::value), "");
     static_assert(C::is_steady, "");
     test(std::chrono::steady_clock::is_steady);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.steady/now.pass.cpp b/test/std/utilities/time/time.clock/time.clock.steady/now.pass.cpp
index 4b86d9e8c..7d268fd67 100644
--- a/test/std/utilities/time/time.clock/time.clock.steady/now.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.steady/now.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,10 +17,12 @@
 #include <chrono>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::steady_clock C;
     C::time_point t1 = C::now();
     C::time_point t2 = C::now();
     assert(t2 >= t1);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.system/consistency.pass.cpp b/test/std/utilities/time/time.clock/time.clock.system/consistency.pass.cpp
index c5ecb3227..b92652134 100644
--- a/test/std/utilities/time/time.clock/time.clock.system/consistency.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.system/consistency.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -28,7 +27,7 @@
 template <class T>
 void test(const T &) {}
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock C;
     static_assert((std::is_same<C::rep, C::duration::rep>::value), "");
@@ -37,4 +36,6 @@ int main()
     static_assert((std::is_same<C::time_point::clock, C>::value), "");
     static_assert((C::is_steady || !C::is_steady), "");
     test(std::chrono::system_clock::is_steady);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.system/from_time_t.pass.cpp b/test/std/utilities/time/time.clock/time.clock.system/from_time_t.pass.cpp
index f4a454f57..54252718d 100644
--- a/test/std/utilities/time/time.clock/time.clock.system/from_time_t.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.system/from_time_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <chrono>
 #include <ctime>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock C;
     C::time_point t1 = C::from_time_t(C::to_time_t(C::now()));
     ((void)t1);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.system/local_time.types.pass.cpp b/test/std/utilities/time/time.clock/time.clock.system/local_time.types.pass.cpp
new file mode 100644
index 000000000..5802166c8
--- /dev/null
+++ b/test/std/utilities/time/time.clock/time.clock.system/local_time.types.pass.cpp
@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+
+// struct local_t {};
+// template<class Duration>
+//   using local_time  = time_point<system_clock, Duration>;
+// using local_seconds = sys_time<seconds>;
+// using local_days    = sys_time<days>;
+
+// [Example: 
+//   sys_seconds{sys_days{1970y/January/1}}.time_since_epoch() is 0s. 
+//   sys_seconds{sys_days{2000y/January/1}}.time_since_epoch() is 946’684’800s, which is 10’957 * 86’400s.
+// —end example]
+
+
+#include <chrono>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    using local_t = std::chrono::local_t;
+    using year    = std::chrono::year;
+
+    using seconds = std::chrono::seconds;
+    using minutes = std::chrono::minutes;
+    using days    = std::chrono::days;
+    
+    using local_seconds = std::chrono::local_seconds;
+    using local_minutes = std::chrono::local_time<minutes>;
+    using local_days    = std::chrono::local_days;
+
+    constexpr std::chrono::month January = std::chrono::January;
+
+    ASSERT_SAME_TYPE(std::chrono::local_time<seconds>, local_seconds);
+    ASSERT_SAME_TYPE(std::chrono::local_time<days>,    local_days);
+
+//  Test the long form, too
+    ASSERT_SAME_TYPE(std::chrono::time_point<local_t, seconds>, local_seconds);
+    ASSERT_SAME_TYPE(std::chrono::time_point<local_t, minutes>, local_minutes);
+    ASSERT_SAME_TYPE(std::chrono::time_point<local_t, days>,    local_days);
+    
+//  Test some well known values
+    local_days d0 = local_days{year{1970}/January/1};
+    local_days d1 = local_days{year{2000}/January/1};
+    ASSERT_SAME_TYPE(decltype(d0.time_since_epoch()), days);
+    assert( d0.time_since_epoch().count() == 0);
+    assert( d1.time_since_epoch().count() == 10957);
+
+    local_seconds s0{d0};
+    local_seconds s1{d1};
+    ASSERT_SAME_TYPE(decltype(s0.time_since_epoch()), seconds);
+    assert( s0.time_since_epoch().count() == 0);
+    assert( s1.time_since_epoch().count() == 946684800L);
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.clock/time.clock.system/now.pass.cpp b/test/std/utilities/time/time.clock/time.clock.system/now.pass.cpp
index ebc0db80b..9d74541f9 100644
--- a/test/std/utilities/time/time.clock/time.clock.system/now.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.system/now.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <chrono>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock C;
     C::time_point t1 = C::now();
     assert(t1.time_since_epoch().count() != 0);
     assert(C::time_point::min() < t1);
     assert(C::time_point::max() > t1);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.system/rep_signed.pass.cpp b/test/std/utilities/time/time.clock/time.clock.system/rep_signed.pass.cpp
index b6a440e16..967af52e1 100644
--- a/test/std/utilities/time/time.clock/time.clock.system/rep_signed.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.system/rep_signed.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 #include <chrono>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     assert(std::chrono::system_clock::duration::min() <
            std::chrono::system_clock::duration::zero());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.clock/time.clock.system/sys.time.types.pass.cpp b/test/std/utilities/time/time.clock/time.clock.system/sys.time.types.pass.cpp
new file mode 100644
index 000000000..174fbe941
--- /dev/null
+++ b/test/std/utilities/time/time.clock/time.clock.system/sys.time.types.pass.cpp
@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// <chrono>
+
+// template<class Duration>
+//   using sys_time  = time_point<system_clock, Duration>;
+// using sys_seconds = sys_time<seconds>;
+// using sys_days    = sys_time<days>;
+
+// [Example: 
+//   sys_seconds{sys_days{1970y/January/1}}.time_since_epoch() is 0s. 
+//   sys_seconds{sys_days{2000y/January/1}}.time_since_epoch() is 946’684’800s, which is 10’957 * 86’400s.
+// —end example]
+
+
+#include <chrono>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    using system_clock = std::chrono::system_clock;
+    using year         = std::chrono::year;
+
+    using seconds = std::chrono::seconds;
+    using minutes = std::chrono::minutes;
+    using days    = std::chrono::days;
+    
+    using sys_seconds = std::chrono::sys_seconds;
+    using sys_minutes = std::chrono::sys_time<minutes>;
+    using sys_days    = std::chrono::sys_days;
+
+    constexpr std::chrono::month January = std::chrono::January;
+
+    ASSERT_SAME_TYPE(std::chrono::sys_time<seconds>, sys_seconds);
+    ASSERT_SAME_TYPE(std::chrono::sys_time<days>,    sys_days);
+
+//  Test the long form, too
+    ASSERT_SAME_TYPE(std::chrono::time_point<system_clock, seconds>, sys_seconds);
+    ASSERT_SAME_TYPE(std::chrono::time_point<system_clock, minutes>, sys_minutes);
+    ASSERT_SAME_TYPE(std::chrono::time_point<system_clock, days>,    sys_days);
+    
+//  Test some well known values
+    sys_days d0 = sys_days{year{1970}/January/1};
+    sys_days d1 = sys_days{year{2000}/January/1};
+    ASSERT_SAME_TYPE(decltype(d0.time_since_epoch()), days);
+    assert( d0.time_since_epoch().count() == 0);
+    assert( d1.time_since_epoch().count() == 10957);
+
+    sys_seconds s0{d0};
+    sys_seconds s1{d1};
+    ASSERT_SAME_TYPE(decltype(s0.time_since_epoch()), seconds);
+    assert( s0.time_since_epoch().count() == 0);
+    assert( s1.time_since_epoch().count() == 946684800L);
+
+    return 0;
+}
diff --git a/test/std/utilities/time/time.clock/time.clock.system/to_time_t.pass.cpp b/test/std/utilities/time/time.clock/time.clock.system/to_time_t.pass.cpp
index c4028063b..86b37bb6b 100644
--- a/test/std/utilities/time/time.clock/time.clock.system/to_time_t.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.system/to_time_t.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <chrono>
 #include <ctime>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock C;
     std::time_t t1 = C::to_time_t(C::now());
     ((void)t1);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/default_ratio.pass.cpp b/test/std/utilities/time/time.duration/default_ratio.pass.cpp
index a34e27832..08870488c 100644
--- a/test/std/utilities/time/time.duration/default_ratio.pass.cpp
+++ b/test/std/utilities/time/time.duration/default_ratio.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 #include <chrono>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::chrono::duration<int, std::ratio<1> >,
                    std::chrono::duration<int> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/duration.fail.cpp b/test/std/utilities/time/time.duration/duration.fail.cpp
index 053616b79..02029c02b 100644
--- a/test/std/utilities/time/time.duration/duration.fail.cpp
+++ b/test/std/utilities/time/time.duration/duration.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,8 +15,10 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::duration<std::chrono::milliseconds> D;
     D d;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/positive_num.fail.cpp b/test/std/utilities/time/time.duration/positive_num.fail.cpp
index e9096fd3f..737576205 100644
--- a/test/std/utilities/time/time.duration/positive_num.fail.cpp
+++ b/test/std/utilities/time/time.duration/positive_num.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::duration<int, std::ratio<5, -1> > D;
     D d;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/ratio.fail.cpp b/test/std/utilities/time/time.duration/ratio.fail.cpp
index 4ce0aaad0..20298b772 100644
--- a/test/std/utilities/time/time.duration/ratio.fail.cpp
+++ b/test/std/utilities/time/time.duration/ratio.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,8 +22,10 @@ public:
     static const int den = D;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::duration<int, Ratio<1> > D;
     D d;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.alg/abs.fail.cpp b/test/std/utilities/time/time.duration/time.duration.alg/abs.fail.cpp
index 221004c56..8d807c7a9 100644
--- a/test/std/utilities/time/time.duration/time.duration.alg/abs.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.alg/abs.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,9 @@
 
 typedef std::chrono::duration<unsigned> unsigned_secs;
 
-int main()
+int main(int, char**)
 {
     std::chrono::abs(unsigned_secs(0));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.alg/abs.pass.cpp b/test/std/utilities/time/time.duration/time.duration.alg/abs.pass.cpp
index 30ea029b7..06f9a7c7f 100644
--- a/test/std/utilities/time/time.duration/time.duration.alg/abs.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.alg/abs.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ test(const Duration& f, const Duration& d)
     }
 }
 
-int main()
+int main(int, char**)
 {
 //  7290000ms is 2 hours, 1 minute, and 30 seconds
     test(std::chrono::milliseconds( 7290000), std::chrono::milliseconds( 7290000));
@@ -47,4 +46,6 @@ int main()
     constexpr std::chrono::hours h2 = std::chrono::abs(std::chrono::hours(3));
     static_assert(h2.count() == 3, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++.pass.cpp
index 416a8db8a..d0e47b7fa 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::hours h(3);
@@ -38,4 +37,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++int.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++int.pass.cpp
index deb4daa8d..084819af3 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++int.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_++int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::hours h1(3);
@@ -39,4 +38,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+.pass.cpp
index 37753bcad..a9d136f79 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::chrono::minutes m(3);
@@ -43,4 +42,6 @@ int main()
     static_assert( (std::is_same< decltype(zero+one), D1>::value), "");
     static_assert( (std::is_same< decltype(+one),     D1>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+=.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+=.pass.cpp
index b74011a3b..4247f2d56 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+=.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_+=.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::seconds s(3);
@@ -42,4 +41,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp
index 98b22a7b1..cfdb7075b 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::hours h(3);
@@ -38,4 +37,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--int.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--int.pass.cpp
index a908c44dd..4afb86e0c 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--int.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_--int.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 #endif
 
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::hours h1(3);
@@ -40,4 +39,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-.pass.cpp
index f932eb51c..fe065ff5f 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     const std::chrono::minutes m(3);
@@ -44,4 +43,6 @@ int main()
     static_assert( (std::is_same< decltype(-one),     D1>::value), "");
     static_assert( (std::is_same< decltype(+one),     D1>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-=.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-=.pass.cpp
index 185db1778..b457619e1 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-=.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-=.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::seconds s(3);
@@ -42,4 +41,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_divide=.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_divide=.pass.cpp
index 4ae774b6c..753ea5a8b 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_divide=.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_divide=.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::nanoseconds ns(15);
@@ -38,4 +37,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=duration.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=duration.pass.cpp
index 194e085ab..649f4aa1a 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=duration.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::microseconds us1(11);
@@ -42,4 +41,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=rep.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=rep.pass.cpp
index 7dcf00225..0eb73ee67 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=rep.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_mod=rep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::microseconds us(11);
@@ -38,4 +37,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_times=.pass.cpp b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_times=.pass.cpp
index f3bf79035..51c20c507 100644
--- a/test/std/utilities/time/time.duration/time.duration.arithmetic/op_times=.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.arithmetic/op_times=.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ constexpr bool test_constexpr()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::nanoseconds ns(3);
@@ -38,4 +37,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(test_constexpr(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/ceil.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cast/ceil.fail.cpp
index 909e85732..a9711f448 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/ceil.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/ceil.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::ceil<int>(std::chrono::milliseconds(3));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/ceil.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cast/ceil.pass.cpp
index 8d7623c85..a6e1982d0 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/ceil.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/ceil.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(const FromDuration& f, const ToDuration& d)
     }
 }
 
-int main()
+int main(int, char**)
 {
 //  7290000ms is 2 hours, 1 minute, and 30 seconds
     test(std::chrono::milliseconds( 7290000), std::chrono::hours( 3));
@@ -48,4 +47,6 @@ int main()
     constexpr std::chrono::hours h2 = std::chrono::ceil<std::chrono::hours>(std::chrono::milliseconds(-9000000));
     static_assert(h2.count() == -2, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/duration_cast.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cast/duration_cast.pass.cpp
index 9ecdfc750..415175676 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/duration_cast.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/duration_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ test(const FromDuration& f, const ToDuration& d)
     }
 }
 
-int main()
+int main(int, char**)
 {
     test(std::chrono::milliseconds(7265000), std::chrono::hours(2));
     test(std::chrono::milliseconds(7265000), std::chrono::minutes(121));
@@ -51,4 +50,6 @@ int main()
     static_assert(h.count() == 2, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/floor.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cast/floor.fail.cpp
index 14d9ca878..c119a800c 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/floor.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/floor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::floor<int>(std::chrono::milliseconds(3));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/floor.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cast/floor.pass.cpp
index 38db42a84..6783b1f67 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/floor.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/floor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(const FromDuration& f, const ToDuration& d)
     }
 }
 
-int main()
+int main(int, char**)
 {
 //  7290000ms is 2 hours, 1 minute, and 30 seconds
     test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
@@ -47,4 +46,6 @@ int main()
     constexpr std::chrono::hours h2 = std::chrono::floor<std::chrono::hours>(std::chrono::milliseconds(-9000000));
     static_assert(h2.count() == -3, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/round.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cast/round.fail.cpp
index 6f9f5bd29..93366b836 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/round.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/round.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::round<int>(std::chrono::milliseconds(3));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/round.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cast/round.pass.cpp
index 2f9689007..ebd2e3194 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/round.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/round.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@ test(const FromDuration& f, const ToDuration& d)
     }
 }
 
-int main()
+int main(int, char**)
 {
 //  7290000ms is 2 hours, 1 minute, and 30 seconds
     test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
@@ -47,4 +46,6 @@ int main()
     constexpr std::chrono::hours h2 = std::chrono::round<std::chrono::hours>(std::chrono::milliseconds(-9000000));
     static_assert(h2.count() == -2, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cast/toduration.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cast/toduration.fail.cpp
index 13dd8f44c..0f52c36d8 100644
--- a/test/std/utilities/time/time.duration/time.duration.cast/toduration.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cast/toduration.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration_cast<int>(std::chrono::milliseconds(3));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.comparisons/op_equal.pass.cpp b/test/std/utilities/time/time.duration/time.duration.comparisons/op_equal.pass.cpp
index 5adc62ff1..c27b52801 100644
--- a/test/std/utilities/time/time.duration/time.duration.comparisons/op_equal.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.comparisons/op_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::seconds s1(3);
@@ -114,4 +113,6 @@ int main()
     static_assert(!(s1 != s2), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.comparisons/op_less.pass.cpp b/test/std/utilities/time/time.duration/time.duration.comparisons/op_less.pass.cpp
index 42e798254..de4763576 100644
--- a/test/std/utilities/time/time.duration/time.duration.comparisons/op_less.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.comparisons/op_less.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::seconds s1(3);
@@ -152,4 +151,6 @@ int main()
     static_assert( (s1 >= s2), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/convert_exact.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cons/convert_exact.pass.cpp
index c237fd771..4c0af92b2 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/convert_exact.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/convert_exact.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::milliseconds ms(1);
@@ -35,4 +34,6 @@ int main()
     static_assert(us.count() == 1000, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/convert_float_to_int.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cons/convert_float_to_int.fail.cpp
index 04c082578..4311c1bde 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/convert_float_to_int.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/convert_float_to_int.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,8 +17,10 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<double> d;
     std::chrono::duration<int> i = d;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.fail.cpp
index e82e25e8f..fb0b488f7 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,8 +17,10 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::microseconds us(1);
     std::chrono::milliseconds ms = us;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.pass.cpp
index 4b5042df2..f72c69c7e 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/convert_inexact.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::duration<double, std::micro> us(1);
@@ -35,4 +34,6 @@ int main()
     static_assert(ms.count() == 1./1000, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/convert_int_to_float.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cons/convert_int_to_float.pass.cpp
index 8e5938b9e..fb127226a 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/convert_int_to_float.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/convert_int_to_float.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::duration<int> i(3);
@@ -35,4 +34,6 @@ int main()
     static_assert(d.count() == 3000, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/convert_overflow.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cons/convert_overflow.pass.cpp
index 74b65d6b9..5b963f2b1 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/convert_overflow.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/convert_overflow.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,11 +26,13 @@ void f(std::chrono::seconds)
     called = true;
 }
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::duration<int, std::exa> r(1);
     f(r);
     assert(called);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/default.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cons/default.pass.cpp
index 4f7d67bb6..c598afa36 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/default.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,9 @@ test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::chrono::duration<Rep> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/rep.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cons/rep.pass.cpp
index 6ad743e71..d1a808ba1 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/rep.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/rep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,10 +31,12 @@ test(R r)
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::chrono::duration<int> >(5);
     test<std::chrono::duration<int, std::ratio<3, 2> > >(5);
     test<std::chrono::duration<Rep, std::ratio<3, 2> > >(Rep(3));
     test<std::chrono::duration<double, std::ratio<2, 3> > >(5.5);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/rep01.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cons/rep01.fail.cpp
index 9f071ca1a..f1e60f5e5 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/rep01.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/rep01.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<int> d = 1;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/rep02.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cons/rep02.fail.cpp
index 37f32e776..4a0932506 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/rep02.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/rep02.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<Rep> d(1);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/rep02.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cons/rep02.pass.cpp
index ae745a76f..1719b1302 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/rep02.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/rep02.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<double> d(5);
     assert(d.count() == 5);
@@ -29,4 +28,6 @@ int main()
     constexpr std::chrono::duration<double> d2(5);
     static_assert(d2.count() == 5, "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.cons/rep03.fail.cpp b/test/std/utilities/time/time.duration/time.duration.cons/rep03.fail.cpp
index 4ace54b23..6b4d00203 100644
--- a/test/std/utilities/time/time.duration/time.duration.cons/rep03.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.cons/rep03.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<int> d(1.);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.literals/literals.pass.cpp b/test/std/utilities/time/time.duration/time.duration.literals/literals.pass.cpp
index e10b35efb..0d924f8f7 100644
--- a/test/std/utilities/time/time.duration/time.duration.literals/literals.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.literals/literals.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals::chrono_literals;
 
@@ -58,4 +57,6 @@ int main()
     auto ns2 = 645.ns;
     assert ( ns == ns2 );
 
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.literals/literals1.fail.cpp b/test/std/utilities/time/time.duration/time.duration.literals/literals1.fail.cpp
index 52208cb54..97e29e876 100644
--- a/test/std/utilities/time/time.duration/time.duration.literals/literals1.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.literals/literals1.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,8 +11,10 @@
 #include <chrono>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::chrono::hours h  = 4h;  // should fail w/conversion operator not found
+
+  return 0;
 }
 
diff --git a/test/std/utilities/time/time.duration/time.duration.literals/literals1.pass.cpp b/test/std/utilities/time/time.duration/time.duration.literals/literals1.pass.cpp
index 6e43e3a9a..2e5b7bbb8 100644
--- a/test/std/utilities/time/time.duration/time.duration.literals/literals1.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.literals/literals1.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11
@@ -12,7 +11,7 @@
 #include <chrono>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std::chrono;
 
@@ -68,4 +67,6 @@ int main()
     assert(November  == month(11));
     assert(December  == month(12));
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.literals/literals2.fail.cpp b/test/std/utilities/time/time.duration/time.duration.literals/literals2.fail.cpp
index f190d7863..dbc915590 100644
--- a/test/std/utilities/time/time.duration/time.duration.literals/literals2.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.literals/literals2.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,9 +11,11 @@
 #include <chrono>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using std::chrono::hours;
 
     hours foo  =  4h;  // should fail w/conversion operator not found
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.literals/literals2.pass.cpp b/test/std/utilities/time/time.duration/time.duration.literals/literals2.pass.cpp
index 282b1c657..d0b8b33e4 100644
--- a/test/std/utilities/time/time.duration/time.duration.literals/literals2.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.literals/literals2.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,7 +13,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     using namespace std::literals;
 
@@ -47,4 +46,6 @@ int main()
     assert ( ns == std::chrono::nanoseconds(645));
     auto ns2 = 645.ns;
     assert ( ns == ns2 );
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_+.pass.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_+.pass.cpp
index 6859ffcb2..ad381f005 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_+.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_+.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::seconds s1(3);
@@ -72,4 +71,6 @@ int main()
     static_assert(r.count() == 75, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_-.pass.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_-.pass.cpp
index 4bf26e428..86ced3fbc 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_-.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_-.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::seconds s1(3);
@@ -73,4 +72,6 @@ int main()
     static_assert(r.count() == -15, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_duration.pass.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_duration.pass.cpp
index 4c4895b2a..e4190fe33 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_duration.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include "test_macros.h"
 #include "truncate_fp.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::nanoseconds ns1(15);
@@ -66,4 +65,6 @@ int main()
     static_assert(s1 / s2 == 20./3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.fail.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.fail.cpp
index db725773f..327ff5635 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<Rep> d(Rep(15));
     d = d / 5;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.pass.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.pass.cpp
index 8b667e84d..94da11302 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_rep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::nanoseconds ns(15);
@@ -35,4 +34,6 @@ int main()
     static_assert(ns2.count() == 3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_duration.pass.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_duration.pass.cpp
index 441b053dc..e7007c1fe 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_duration.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::nanoseconds ns1(15);
@@ -61,4 +60,6 @@ int main()
     static_assert(r.count() == 24, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.fail.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.fail.cpp
index 16e511d44..f2a5885ab 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<Rep> d(Rep(15));
     d = d % 5;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.pass.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.pass.cpp
index 537fae373..754b9800a 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_mod_rep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::nanoseconds ns(15);
@@ -35,4 +34,6 @@ int main()
     static_assert(ns2.count() == 3, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep.pass.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep.pass.cpp
index 6b8c83732..c3e499638 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     std::chrono::nanoseconds ns(3);
@@ -44,4 +43,6 @@ int main()
     static_assert(ns3.count() == 18, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep1.fail.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep1.fail.cpp
index d8160500f..44a77cea1 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep1.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,8 +22,10 @@
 
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<Rep> d;
     d = d * 5;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep2.fail.cpp b/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep2.fail.cpp
index e224ba942..9ce82582c 100644
--- a/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep2.fail.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.nonmember/op_times_rep2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,8 +22,10 @@
 
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     std::chrono::duration<Rep> d;
     d = 5 * d;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.observer/tested_elsewhere.pass.cpp b/test/std/utilities/time/time.duration/time.duration.observer/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/time/time.duration/time.duration.observer/tested_elsewhere.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.observer/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.special/max.pass.cpp b/test/std/utilities/time/time.duration/time.duration.special/max.pass.cpp
index 29b0e04c2..58de66a01 100644
--- a/test/std/utilities/time/time.duration/time.duration.special/max.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.special/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,9 +22,9 @@
 template <class D>
 void test()
 {
-	LIBCPP_ASSERT_NOEXCEPT(std::chrono::duration_values<typename D::rep>::max());
+    LIBCPP_ASSERT_NOEXCEPT(std::chrono::duration_values<typename D::rep>::max());
 #if TEST_STD_VER > 17
-	ASSERT_NOEXCEPT(       std::chrono::duration_values<typename D::rep>::max());
+    ASSERT_NOEXCEPT(       std::chrono::duration_values<typename D::rep>::max());
 #endif
     {
     typedef typename D::rep Rep;
@@ -41,8 +40,10 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::chrono::duration<int> >();
     test<std::chrono::duration<Rep> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.special/min.pass.cpp b/test/std/utilities/time/time.duration/time.duration.special/min.pass.cpp
index daf7165cf..9b0113b29 100644
--- a/test/std/utilities/time/time.duration/time.duration.special/min.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.special/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,8 +40,10 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::chrono::duration<int> >();
     test<std::chrono::duration<Rep> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/time.duration.special/zero.pass.cpp b/test/std/utilities/time/time.duration/time.duration.special/zero.pass.cpp
index f9a4673db..34a05b5f0 100644
--- a/test/std/utilities/time/time.duration/time.duration.special/zero.pass.cpp
+++ b/test/std/utilities/time/time.duration/time.duration.special/zero.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,9 +21,9 @@
 template <class D>
 void test()
 {
-	LIBCPP_ASSERT_NOEXCEPT(std::chrono::duration_values<typename D::rep>::zero());
+    LIBCPP_ASSERT_NOEXCEPT(std::chrono::duration_values<typename D::rep>::zero());
 #if TEST_STD_VER > 17
-	ASSERT_NOEXCEPT(       std::chrono::duration_values<typename D::rep>::zero());
+    ASSERT_NOEXCEPT(       std::chrono::duration_values<typename D::rep>::zero());
 #endif
     {
     typedef typename D::rep Rep;
@@ -40,8 +39,10 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::chrono::duration<int> >();
     test<std::chrono::duration<Rep> >();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.duration/types.pass.cpp b/test/std/utilities/time/time.duration/types.pass.cpp
index 8eaffe776..250e53285 100644
--- a/test/std/utilities/time/time.duration/types.pass.cpp
+++ b/test/std/utilities/time/time.duration/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 #include <chrono>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::duration<long, std::ratio<3, 2> > D;
     static_assert((std::is_same<D::rep, long>::value), "");
     static_assert((std::is_same<D::period, std::ratio<3, 2> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/default_duration.pass.cpp b/test/std/utilities/time/time.point/default_duration.pass.cpp
index dfdf225ed..8a58413a0 100644
--- a/test/std/utilities/time/time.point/default_duration.pass.cpp
+++ b/test/std/utilities/time/time.point/default_duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 #include <chrono>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     static_assert((std::is_same<std::chrono::system_clock::duration,
                    std::chrono::time_point<std::chrono::system_clock>::duration>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/duration.fail.cpp b/test/std/utilities/time/time.point/duration.fail.cpp
index ee48bcb39..6461eb3d9 100644
--- a/test/std/utilities/time/time.point/duration.fail.cpp
+++ b/test/std/utilities/time/time.point/duration.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::time_point<std::chrono::system_clock, int> T;
     T t;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.arithmetic/op_+=.pass.cpp b/test/std/utilities/time/time.point/time.point.arithmetic/op_+=.pass.cpp
index d60f6276a..002fffc38 100644
--- a/test/std/utilities/time/time.point/time.point.arithmetic/op_+=.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.arithmetic/op_+=.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ constexpr bool constexpr_test()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::chrono::system_clock Clock;
@@ -43,4 +42,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(constexpr_test(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.arithmetic/op_-=.pass.cpp b/test/std/utilities/time/time.point/time.point.arithmetic/op_-=.pass.cpp
index 9ef952559..2365d539c 100644
--- a/test/std/utilities/time/time.point/time.point.arithmetic/op_-=.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.arithmetic/op_-=.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ constexpr bool constexpr_test()
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::chrono::system_clock Clock;
@@ -43,4 +42,6 @@ int main()
 #if TEST_STD_VER > 14
     static_assert(constexpr_test(), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/ceil.fail.cpp b/test/std/utilities/time/time.point/time.point.cast/ceil.fail.cpp
index 1c92d75b9..fb82fdffe 100644
--- a/test/std/utilities/time/time.point/time.point.cast/ceil.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/ceil.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::ceil<int>(std::chrono::system_clock::now());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/ceil.pass.cpp b/test/std/utilities/time/time.point/time.point.cast/ceil.pass.cpp
index e6e7c0538..8dfd1bdaa 100644
--- a/test/std/utilities/time/time.point/time.point.cast/ceil.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/ceil.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ void test_constexpr ()
 }
 
 
-int main()
+int main(int, char**)
 {
 //  7290000ms is 2 hours, 1 minute, and 30 seconds
     test(std::chrono::milliseconds( 7290000), std::chrono::hours( 3));
@@ -66,4 +65,6 @@ int main()
 
     test_constexpr<std::chrono::milliseconds, 9000000, std::chrono::seconds, 9000> ();
     test_constexpr<std::chrono::milliseconds,-9000000, std::chrono::seconds,-9000> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/floor.fail.cpp b/test/std/utilities/time/time.point/time.point.cast/floor.fail.cpp
index ea48e1219..12b1dec9f 100644
--- a/test/std/utilities/time/time.point/time.point.cast/floor.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/floor.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::floor<int>(std::chrono::system_clock::now());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/floor.pass.cpp b/test/std/utilities/time/time.point/time.point.cast/floor.pass.cpp
index efd2d9e25..d50fff4a1 100644
--- a/test/std/utilities/time/time.point/time.point.cast/floor.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/floor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void test_constexpr ()
     }
 }
 
-int main()
+int main(int, char**)
 {
 //  7290000ms is 2 hours, 1 minute, and 30 seconds
     test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
@@ -65,4 +64,6 @@ int main()
 
     test_constexpr<std::chrono::milliseconds, 9000000, std::chrono::seconds, 9000> ();
     test_constexpr<std::chrono::milliseconds,-9000000, std::chrono::seconds,-9000> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/round.fail.cpp b/test/std/utilities/time/time.point/time.point.cast/round.fail.cpp
index 53c14f47d..a5436c684 100644
--- a/test/std/utilities/time/time.point/time.point.cast/round.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/round.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,9 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     std::chrono::round<int>(std::chrono::system_clock::now());
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/round.pass.cpp b/test/std/utilities/time/time.point/time.point.cast/round.pass.cpp
index b5d16cf11..d8bb1b505 100644
--- a/test/std/utilities/time/time.point/time.point.cast/round.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/round.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ void test_constexpr ()
     }
 }
 
-int main()
+int main(int, char**)
 {
 //  7290000ms is 2 hours, 1 minute, and 30 seconds
     test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
@@ -65,4 +64,6 @@ int main()
 
     test_constexpr<std::chrono::milliseconds, 9000000, std::chrono::seconds, 9000> ();
     test_constexpr<std::chrono::milliseconds,-9000000, std::chrono::seconds,-9000> ();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/time_point_cast.pass.cpp b/test/std/utilities/time/time.point/time.point.cast/time_point_cast.pass.cpp
index ae5423ef1..90e6ccef6 100644
--- a/test/std/utilities/time/time.point/time.point.cast/time_point_cast.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/time_point_cast.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ void test_constexpr ()
 
 #endif
 
-int main()
+int main(int, char**)
 {
     test(std::chrono::milliseconds(7265000), std::chrono::hours(2));
     test(std::chrono::milliseconds(7265000), std::chrono::minutes(121));
@@ -79,4 +78,6 @@ int main()
     test_constexpr<std::chrono::duration<int, std::ratio<2, 3>>, 9, T1, 10> ();
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cast/toduration.fail.cpp b/test/std/utilities/time/time.point/time.point.cast/toduration.fail.cpp
index de1e5bb3e..c16492f73 100644
--- a/test/std/utilities/time/time.point/time.point.cast/toduration.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.cast/toduration.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,10 +18,12 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::time_point<Clock, std::chrono::milliseconds> FromTimePoint;
     typedef std::chrono::time_point<Clock, std::chrono::minutes> ToTimePoint;
     std::chrono::time_point_cast<ToTimePoint>(FromTimePoint(std::chrono::milliseconds(3)));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.comparisons/op_equal.fail.cpp b/test/std/utilities/time/time.point/time.point.comparisons/op_equal.fail.cpp
index f5ff11958..2b5795026 100644
--- a/test/std/utilities/time/time.point/time.point.comparisons/op_equal.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.comparisons/op_equal.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "../../clock.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock1;
     typedef Clock                     Clock2;
@@ -37,4 +36,6 @@ int main()
     T1 t1(Duration1(3));
     T2 t2(Duration2(3000));
     t1 == t2;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.comparisons/op_equal.pass.cpp b/test/std/utilities/time/time.point/time.point.comparisons/op_equal.pass.cpp
index a6f7cc0b8..f110ec5d4 100644
--- a/test/std/utilities/time/time.point/time.point.comparisons/op_equal.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.comparisons/op_equal.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration1;
@@ -83,4 +82,6 @@ int main()
     static_assert( (t1 != t2), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.comparisons/op_less.fail.cpp b/test/std/utilities/time/time.point/time.point.comparisons/op_less.fail.cpp
index f9745cbf9..3d158ea89 100644
--- a/test/std/utilities/time/time.point/time.point.comparisons/op_less.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.comparisons/op_less.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@
 
 #include "../../clock.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock1;
     typedef Clock                     Clock2;
@@ -45,4 +44,6 @@ int main()
     T1 t1(Duration1(3));
     T2 t2(Duration2(3000));
     t1 < t2;
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.comparisons/op_less.pass.cpp b/test/std/utilities/time/time.point/time.point.comparisons/op_less.pass.cpp
index d7adf29f2..3b4aa6abe 100644
--- a/test/std/utilities/time/time.point/time.point.comparisons/op_less.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.comparisons/op_less.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,7 +31,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration1;
@@ -107,4 +106,6 @@ int main()
     static_assert(!(t1 >= t2), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cons/convert.fail.cpp b/test/std/utilities/time/time.point/time.point.cons/convert.fail.cpp
index 565aa6c4f..2e601179a 100644
--- a/test/std/utilities/time/time.point/time.point.cons/convert.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.cons/convert.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration1;
@@ -27,4 +26,6 @@ int main()
     std::chrono::time_point<Clock, Duration2> t2(Duration2(3));
     std::chrono::time_point<Clock, Duration1> t1 = t2;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cons/convert.pass.cpp b/test/std/utilities/time/time.point/time.point.cons/convert.pass.cpp
index 33e349fe8..f9b35c957 100644
--- a/test/std/utilities/time/time.point/time.point.cons/convert.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.cons/convert.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::microseconds Duration1;
@@ -36,4 +35,6 @@ int main()
     static_assert(t1.time_since_epoch() == Duration1(3000), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cons/default.pass.cpp b/test/std/utilities/time/time.point/time.point.cons/default.pass.cpp
index 120fd3fb4..b40113999 100644
--- a/test/std/utilities/time/time.point/time.point.cons/default.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.cons/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include "test_macros.h"
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::duration<Rep, std::milli> Duration;
@@ -33,4 +32,6 @@ int main()
     static_assert(t.time_since_epoch() == Duration::zero(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cons/duration.fail.cpp b/test/std/utilities/time/time.point/time.point.cons/duration.fail.cpp
index 810007ed9..b28116236 100644
--- a/test/std/utilities/time/time.point/time.point.cons/duration.fail.cpp
+++ b/test/std/utilities/time/time.point/time.point.cons/duration.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,9 +16,11 @@
 
 #include <chrono>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration;
     std::chrono::time_point<Clock, Duration> t = Duration(3);
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.cons/duration.pass.cpp b/test/std/utilities/time/time.point/time.point.cons/duration.pass.cpp
index 1b96902ab..078c6641e 100644
--- a/test/std/utilities/time/time.point/time.point.cons/duration.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.cons/duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration;
@@ -40,4 +39,6 @@ int main()
     static_assert(t.time_since_epoch() == Duration(3000), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.nonmember/op_+.pass.cpp b/test/std/utilities/time/time.point/time.point.nonmember/op_+.pass.cpp
index 19f5cbcd9..7d78f7f43 100644
--- a/test/std/utilities/time/time.point/time.point.nonmember/op_+.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.nonmember/op_+.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration1;
@@ -45,4 +44,6 @@ int main()
     static_assert(t3.time_since_epoch() == Duration2(3006), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.nonmember/op_-duration.pass.cpp b/test/std/utilities/time/time.point/time.point.nonmember/op_-duration.pass.cpp
index 978f09d66..6fe876969 100644
--- a/test/std/utilities/time/time.point/time.point.nonmember/op_-duration.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.nonmember/op_-duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -31,7 +30,7 @@ void test2739()  // LWG2739
     assert(t1 < t0);
 }
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration1;
@@ -50,4 +49,6 @@ int main()
 #endif
     test2739<int32_t>();
     test2739<uint32_t>();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.nonmember/op_-time_point.pass.cpp b/test/std/utilities/time/time.point/time.point.nonmember/op_-time_point.pass.cpp
index fcef3f249..22e4520f3 100644
--- a/test/std/utilities/time/time.point/time.point.nonmember/op_-time_point.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.nonmember/op_-time_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration1;
@@ -37,4 +36,6 @@ int main()
     static_assert((t1 - t2) == Duration2(2995), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.observer/tested_elsewhere.pass.cpp b/test/std/utilities/time/time.point/time.point.observer/tested_elsewhere.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/time/time.point/time.point.observer/tested_elsewhere.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.observer/tested_elsewhere.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.special/max.pass.cpp b/test/std/utilities/time/time.point/time.point.special/max.pass.cpp
index 1d8d07964..e7826b1a6 100644
--- a/test/std/utilities/time/time.point/time.point.special/max.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.special/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,14 +17,16 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration;
     typedef std::chrono::time_point<Clock, Duration> TP;
-	LIBCPP_ASSERT_NOEXCEPT(TP::max());
+    LIBCPP_ASSERT_NOEXCEPT(TP::max());
 #if TEST_STD_VER > 17
-	ASSERT_NOEXCEPT(       TP::max());
+    ASSERT_NOEXCEPT(       TP::max());
 #endif
     assert(TP::max() == TP(Duration::max()));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.point/time.point.special/min.pass.cpp b/test/std/utilities/time/time.point/time.point.special/min.pass.cpp
index fab5b4aae..fae3339b0 100644
--- a/test/std/utilities/time/time.point/time.point.special/min.pass.cpp
+++ b/test/std/utilities/time/time.point/time.point.special/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::system_clock Clock;
     typedef std::chrono::milliseconds Duration;
@@ -28,4 +27,6 @@ int main()
     ASSERT_NOEXCEPT(       TP::max());
 #endif
     assert(TP::min() == TP(Duration::min()));
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.traits/nothing_to_do.pass.cpp b/test/std/utilities/time/time.traits/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/time/time.traits/nothing_to_do.pass.cpp
+++ b/test/std/utilities/time/time.traits/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.traits/time.traits.duration_values/max.pass.cpp b/test/std/utilities/time/time.traits/time.traits.duration_values/max.pass.cpp
index bd4115437..8d244c773 100644
--- a/test/std/utilities/time/time.traits/time.traits.duration_values/max.pass.cpp
+++ b/test/std/utilities/time/time.traits/time.traits.duration_values/max.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::chrono::duration_values<int>::max() ==
            std::numeric_limits<int>::max());
@@ -43,4 +42,6 @@ int main()
     ASSERT_NOEXCEPT(std::chrono::duration_values<double>::max());
     ASSERT_NOEXCEPT(std::chrono::duration_values<Rep>::max());
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.traits/time.traits.duration_values/min.pass.cpp b/test/std/utilities/time/time.traits/time.traits.duration_values/min.pass.cpp
index 207a9ab5a..4ff03c622 100644
--- a/test/std/utilities/time/time.traits/time.traits.duration_values/min.pass.cpp
+++ b/test/std/utilities/time/time.traits/time.traits.duration_values/min.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::chrono::duration_values<int>::min() ==
            std::numeric_limits<int>::lowest());
@@ -43,4 +42,6 @@ int main()
     ASSERT_NOEXCEPT(std::chrono::duration_values<double>::min());
     ASSERT_NOEXCEPT(std::chrono::duration_values<Rep>::min());
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.traits/time.traits.duration_values/zero.pass.cpp b/test/std/utilities/time/time.traits/time.traits.duration_values/zero.pass.cpp
index 614c69b2e..d9de07b41 100644
--- a/test/std/utilities/time/time.traits/time.traits.duration_values/zero.pass.cpp
+++ b/test/std/utilities/time/time.traits/time.traits.duration_values/zero.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include "test_macros.h"
 #include "../../rep.h"
 
-int main()
+int main(int, char**)
 {
     assert(std::chrono::duration_values<int>::zero() == 0);
     assert(std::chrono::duration_values<Rep>::zero() == 0);
@@ -32,4 +31,6 @@ int main()
     ASSERT_NOEXCEPT(std::chrono::duration_values<int>::zero());
     ASSERT_NOEXCEPT(std::chrono::duration_values<Rep>::zero());
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.traits/time.traits.is_fp/treat_as_floating_point.pass.cpp b/test/std/utilities/time/time.traits/time.traits.is_fp/treat_as_floating_point.pass.cpp
index faacb573d..9db3d96d2 100644
--- a/test/std/utilities/time/time.traits/time.traits.is_fp/treat_as_floating_point.pass.cpp
+++ b/test/std/utilities/time/time.traits/time.traits.is_fp/treat_as_floating_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ test()
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     test<int>();
     test<unsigned>();
@@ -40,4 +39,6 @@ int main()
     test<double>();
     test<long double>();
     test<A>();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.traits/time.traits.specializations/duration.pass.cpp b/test/std/utilities/time/time.traits/time.traits.specializations/duration.pass.cpp
index f942844b6..3dde54047 100644
--- a/test/std/utilities/time/time.traits/time.traits.specializations/duration.pass.cpp
+++ b/test/std/utilities/time/time.traits/time.traits.specializations/duration.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ test()
     static_assert((std::is_same<Dc, De>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::chrono::duration<int, std::ratio<1, 100> >,
          std::chrono::duration<long, std::ratio<1, 1000> >,
@@ -39,4 +38,6 @@ int main()
     test<std::chrono::duration<double, std::ratio<21, 1> >,
          std::chrono::duration<short, std::ratio<15, 1> >,
          std::chrono::duration<double, std::ratio<3, 1> > >();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/time.traits/time.traits.specializations/time_point.pass.cpp b/test/std/utilities/time/time.traits/time.traits.specializations/time_point.pass.cpp
index a0786b499..d73bb8ae6 100644
--- a/test/std/utilities/time/time.traits/time.traits.specializations/time_point.pass.cpp
+++ b/test/std/utilities/time/time.traits/time.traits.specializations/time_point.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ test()
     static_assert((std::is_same<Tc, Te>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::chrono::duration<int, std::ratio<1, 100> >,
          std::chrono::duration<long, std::ratio<1, 1000> >,
@@ -43,4 +42,6 @@ int main()
     test<std::chrono::duration<double, std::ratio<21, 1> >,
          std::chrono::duration<short, std::ratio<15, 1> >,
          std::chrono::duration<double, std::ratio<3, 1> > >();
+
+  return 0;
 }
diff --git a/test/std/utilities/time/weeks.pass.cpp b/test/std/utilities/time/weeks.pass.cpp
index 8e6f283f0..5a0cf3417 100644
--- a/test/std/utilities/time/weeks.pass.cpp
+++ b/test/std/utilities/time/weeks.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -16,7 +15,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::weeks D;
     typedef D::rep Rep;
@@ -25,4 +24,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 22, "");
     static_assert(std::is_same_v<Period, std::ratio_multiply<std::ratio<7>, std::chrono::days::period>>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/time/years.pass.cpp b/test/std/utilities/time/years.pass.cpp
index 28a250274..501636926 100644
--- a/test/std/utilities/time/years.pass.cpp
+++ b/test/std/utilities/time/years.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
@@ -16,7 +15,7 @@
 #include <type_traits>
 #include <limits>
 
-int main()
+int main(int, char**)
 {
     typedef std::chrono::years D;
     typedef D::rep Rep;
@@ -25,4 +24,6 @@ int main()
     static_assert(std::is_integral<Rep>::value, "");
     static_assert(std::numeric_limits<Rep>::digits >= 17, "");
     static_assert(std::is_same_v<Period, std::ratio_multiply<std::ratio<146097, 400>, std::chrono::days::period>>, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.general/ignore.pass.cpp b/test/std/utilities/tuple/tuple.general/ignore.pass.cpp
index a7a0904cf..5d0409a7c 100644
--- a/test/std/utilities/tuple/tuple.general/ignore.pass.cpp
+++ b/test/std/utilities/tuple/tuple.general/ignore.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ constexpr bool test_ignore_constexpr()
     return true;
 }
 
-int main() {
+int main(int, char**) {
     {
         constexpr auto& ignore_v = std::ignore;
         ((void)ignore_v);
@@ -51,4 +50,6 @@ int main() {
     {
         LIBCPP_STATIC_ASSERT(std::is_trivial<decltype(std::ignore)>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp b/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp
index 811dfc03b..d57e7ad18 100644
--- a/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp
+++ b/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -16,7 +15,7 @@
 #include <tuple>
 #include <memory>
 
-int main () {
+int main(int, char**) {
     {
     std::tuple<std::unique_ptr<char>> up;
     std::tuple<std::shared_ptr<char>> sp;
@@ -30,4 +29,6 @@ int main () {
     // Smart pointers of type 'T[N]' are not tested here since they are not
     // supported by the standard nor by libc++'s implementation.
     // See https://reviews.llvm.org/D21320 for more information.
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/TupleFunction.pass.cpp b/test/std/utilities/tuple/tuple.tuple/TupleFunction.pass.cpp
index ce6dcf811..ede72c2a5 100644
--- a/test/std/utilities/tuple/tuple.tuple/TupleFunction.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/TupleFunction.pass.cpp
@@ -1,17 +1,14 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-// This is for bugs 18853 and 19118
-
-#include "test_macros.h"
+// UNSUPPORTED: c++98, c++03
 
-#if TEST_STD_VER >= 11
+// This is for bugs 18853 and 19118
 
 #include <tuple>
 #include <functional>
@@ -26,12 +23,10 @@ struct X
     void operator()() {}
 };
 
-int
-main()
+int main(int, char**)
 {
     X x;
     std::function<void()> f(x);
+
+  return 0;
 }
-#else
-int main () {}
-#endif
diff --git a/test/std/utilities/tuple/tuple.tuple/alloc_first.h b/test/std/utilities/tuple/tuple.tuple/alloc_first.h
index 237a2897e..3db836a42 100644
--- a/test/std/utilities/tuple/tuple.tuple/alloc_first.h
+++ b/test/std/utilities/tuple/tuple.tuple/alloc_first.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/tuple/tuple.tuple/alloc_last.h b/test/std/utilities/tuple/tuple.tuple/alloc_last.h
index 71a9b9e97..76f69e137 100644
--- a/test/std/utilities/tuple/tuple.tuple/alloc_last.h
+++ b/test/std/utilities/tuple/tuple.tuple/alloc_last.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply.pass.cpp
index 4c15499f5..52e94cc0b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -266,9 +265,11 @@ void test_return_type()
     test<13, int const volatile *>();
 }
 
-int main() {
+int main(int, char**) {
     test_constexpr_evaluation();
     test_call_quals_and_arg_types();
     test_return_type();
     test_noexcept();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_extended_types.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_extended_types.pass.cpp
index 02d7fe43e..851a535eb 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_extended_types.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_extended_types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -361,7 +360,7 @@ void test_ext_int_2()
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         test_ext_int_0<
@@ -423,4 +422,6 @@ int main()
           , std::tuple<A_base_2, int, int>, std::tuple<A_base_2 const, int, int>
           >();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_large_arity.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_large_arity.pass.cpp
index 33c3ef595..004a5d464 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_large_arity.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_large_arity.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -130,7 +129,7 @@ void test_one()
     }
 }
 
-int main()
+int main(int, char**)
 {
     // Instantiate with 1-5 arguments.
     test_all<1>();
@@ -141,4 +140,6 @@ int main()
 
     // Stress test with 256
     test_one<256>();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
index bd91ce61b..53574ee1d 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -206,9 +205,11 @@ void test_noexcept() {
     }
 }
 
-int main()
+int main(int, char**)
 {
     test_constexpr_construction();
     test_perfect_forwarding();
     test_noexcept();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/const_pair.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/const_pair.pass.cpp
index a66fba22d..9353add37 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/const_pair.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/const_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 #include <utility>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<long, char> T0;
@@ -31,4 +30,6 @@ int main()
         assert(std::get<0>(t1) == 2);
         assert(std::get<1>(t1) == short('a'));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_copy.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_copy.pass.cpp
index 85dcee893..8b9447c99 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_copy.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ struct D
     explicit D(int i = 0) : B(i) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<long> T0;
@@ -86,4 +85,6 @@ int main()
         assert(std::get<0>(t) == 43);
         assert(&std::get<0>(t) == &x);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_move.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_move.pass.cpp
index 1a32acd55..71855a309 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_move.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/convert_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,7 +43,7 @@ struct E {
   }
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<long> T0;
@@ -107,4 +106,6 @@ int main()
         assert(std::get<0>(t) == 43);
         assert(&std::get<0>(t) == &x);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.fail.cpp
index 5911391d6..c3fa6495f 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<MoveOnly> T;
@@ -28,4 +27,6 @@ int main()
         T t;
         t = t0;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.pass.cpp
index edb235a41..f6ff1041e 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ struct MoveAssignable {
   MoveAssignable& operator=(MoveAssignable&&) = default;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -101,4 +100,6 @@ int main()
         using T = std::tuple<int, MoveAssignable>;
         static_assert(!std::is_copy_assignable<T>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/move.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/move.pass.cpp
index 9bc0ef501..575c3b1df 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/move.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -49,7 +48,7 @@ int CountAssign::copied = 0;
 int CountAssign::moved = 0;
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -123,4 +122,6 @@ int main()
         assert(CountAssign::copied == 1);
         assert(CountAssign::moved == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/move_pair.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/move_pair.pass.cpp
index 27656a675..9681a238a 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/move_pair.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/move_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,7 +35,7 @@ struct D
     explicit D(int i) : B(i) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<long, std::unique_ptr<D>> T0;
@@ -47,4 +46,6 @@ int main()
         assert(std::get<0>(t1) == 2);
         assert(std::get<1>(t1)->id_ == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.assign/tuple_array_template_depth.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.assign/tuple_array_template_depth.pass.cpp
index 08d1304f9..5796e8dbe 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.assign/tuple_array_template_depth.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.assign/tuple_array_template_depth.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,9 +25,11 @@
 typedef std::array<char, 1256> array_t;
 typedef std::tuple<array_t> tuple_t;
 
-int main()
+int main(int, char**)
 {
     array_t arr;
     tuple_t tup;
     tup = arr;
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.pass.cpp
index bfa7c0d23..973aa93df 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR20855_tuple_ref_binding_diagnostics.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -132,7 +131,9 @@ void allocator_tests() {
 }
 
 
-int main() {
+int main(int, char**) {
   compile_tests();
   allocator_tests();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR22806_constrain_tuple_like_ctor.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR22806_constrain_tuple_like_ctor.pass.cpp
index 0d3b7ff24..1e1b0846c 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR22806_constrain_tuple_like_ctor.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR22806_constrain_tuple_like_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -79,7 +78,7 @@ struct ConvertibleFromInt {
   ConvertibleFromInt(int) : state(FromInt) {}
 };
 
-int main()
+int main(int, char**)
 {
     // Test for the creation of dangling references when a tuple is used to
     // store a reference to another tuple as its only element.
@@ -175,4 +174,6 @@ int main()
         std::tuple<VT> t2 = {t1};
         assert(std::get<0>(t2).state == VT::FromInt);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR23256_constrain_UTypes_ctor.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR23256_constrain_UTypes_ctor.pass.cpp
index a5b3d4415..919d88e46 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR23256_constrain_UTypes_ctor.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR23256_constrain_UTypes_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -58,7 +57,7 @@ struct ExplicitUnconstrainedCtor {
 
 };
 
-int main() {
+int main(int, char**) {
     typedef UnconstrainedCtor A;
     typedef ExplicitUnconstrainedCtor ExplicitA;
     {
@@ -95,4 +94,6 @@ int main() {
         std::tuple<ExplicitA&&> t2(std::forward_as_tuple(ExplicitA{}));
         ((void)t2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR27684_contains_ref_to_incomplete_type.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR27684_contains_ref_to_incomplete_type.pass.cpp
index c8b722f83..1493f4f81 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR27684_contains_ref_to_incomplete_type.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR27684_contains_ref_to_incomplete_type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -30,7 +29,7 @@ extern IncompleteType inc2;
 IncompleteType const& cinc1 = inc1;
 IncompleteType const& cinc2 = inc2;
 
-int main() {
+int main(int, char**) {
     using IT = IncompleteType;
     { // try calling tuple(Tp const&...)
         using Tup = std::tuple<const IT&, const IT&>;
@@ -44,6 +43,8 @@ int main() {
         assert(&std::get<0>(t) == &inc1);
         assert(&std::get<1>(t) == &inc2);
     }
+
+  return 0;
 }
 
 struct IncompleteType {};
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR31384.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR31384.pass.cpp
index dd9b83242..6c44f7027 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR31384.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/PR31384.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct ExplicitDerived : std::tuple<T> {
   explicit operator std::tuple<U>() && { ++count; return {}; }
 };
 
-int main() {
+int main(int, char**) {
   {
     std::tuple<Explicit> foo = Derived<int>{42}; ((void)foo);
     assert(count == 1);
@@ -85,4 +84,6 @@ int main() {
   }
   count = 0;
 
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.fail.cpp
index b9497bea5..3b9d0beea 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,9 +42,11 @@ public:
     bool operator< (const MoveOnly& x) const {return data_ <  x.data_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::tuple<MoveOnly> t = 1;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.pass.cpp
index fed27aa84..916255c96 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/UTypes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -103,7 +102,7 @@ void test_default_constructible_extension_sfinae()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     {
         std::tuple<MoveOnly> t(MoveOnly(0));
@@ -157,4 +156,6 @@ int main()
     // Check that SFINAE is properly applied with the default reduced arity
     // constructor extensions.
     test_default_constructible_extension_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc.pass.cpp
index bf66da162..c5f52a928 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct NonDefaultConstructible {
 
 struct DerivedFromAllocArgT : std::allocator_arg_t {};
 
-int main()
+int main(int, char**)
 {
     {
         std::tuple<> t(std::allocator_arg, A1<int>());
@@ -106,4 +105,6 @@ int main()
         std::tuple<T, T> t2(42, 42);
         (void)t2;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_UTypes.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_UTypes.pass.cpp
index e174e9b32..57e2f1b41 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_UTypes.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_UTypes.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -78,7 +77,7 @@ struct Explicit {
   explicit Explicit(int x) : value(x) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::tuple<Explicit> t{std::allocator_arg, std::allocator<void>{}, 42};
@@ -149,4 +148,6 @@ int main()
     // ensure that the "reduced-arity-initialization" extension is not offered
     // for these constructors.
     test_uses_allocator_sfinae_evaluation();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.fail.cpp
index b28ad6dab..76f99e197 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,8 +35,10 @@ std::tuple<ExplicitCopy> non_const_explicity_copy_test() {
     return {std::allocator_arg, std::allocator<void>{}, e};
     // expected-error@-1 {{chosen constructor is explicit in copy-initialization}}
 }
-int main()
+int main(int, char**)
 {
     const_explicit_copy_test();
     non_const_explicity_copy_test();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.pass.cpp
index 73d53a4c0..3b5b27f7b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_Types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ std::tuple<ImplicitCopy> testImplicitCopy2() {
     return {std::allocator_arg, std::allocator<void>{}, i};
 }
 
-int main()
+int main(int, char**)
 {
     {
         // check that the literal '0' can implicitly initialize a stored pointer.
@@ -95,4 +94,6 @@ int main()
         assert(!alloc_last::allocator_constructed);
         assert(std::get<2>(t) == alloc_last(3));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_pair.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_pair.pass.cpp
index 1d0c7b49a..a7cffa72d 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_pair.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_const_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "../alloc_first.h"
 #include "../alloc_last.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<long, int> T0;
@@ -56,4 +55,6 @@ int main()
         assert(std::get<0>(t1) == 2);
         assert(std::get<1>(t1) == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.fail.cpp
index ccf08833b..ca9518d6b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,9 @@ std::tuple<ExplicitCopy> non_const_explicit_copy_test() {
     // expected-error@-1 {{chosen constructor is explicit in copy-initialization}}
 }
 
-int main()
+int main(int, char**)
 {
 
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.pass.cpp
index 153cd2b3d..083e15797 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -34,7 +33,7 @@ struct Implicit {
   Implicit(int x) : value(x) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<long> T0;
@@ -87,4 +86,6 @@ int main()
         std::tuple<Implicit> t2 = {std::allocator_arg, std::allocator<void>{}, t1};
         assert(std::get<0>(t2).value == 42);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.fail.cpp
index d3539cebf..7a2a5ffff 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,9 @@ std::tuple<ExplicitCopy> explicit_move_test() {
     // expected-error@-1 {{chosen constructor is explicit in copy-initialization}}
 }
 
-int main()
+int main(int, char**)
 {
 
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.pass.cpp
index d3a6add5d..1f33ef2fc 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_convert_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ struct Implicit {
   Implicit(int x) : value(x) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<int> T0;
@@ -101,4 +100,6 @@ int main()
         std::tuple<Implicit> t2 = {std::allocator_arg, std::allocator<void>{}, std::move(t1)};
         assert(std::get<0>(t2).value == 42);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_copy.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_copy.pass.cpp
index 7c9f60cbf..1db842b8d 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_copy.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "../alloc_first.h"
 #include "../alloc_last.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -78,4 +77,6 @@ int main()
         assert(std::get<2>(t) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move.pass.cpp
index a3e1a9de6..fc25a4fc6 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "../alloc_first.h"
 #include "../alloc_last.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -77,4 +76,6 @@ int main()
         assert(std::get<2>(t) == 3);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move_pair.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move_pair.pass.cpp
index 03e9ab2f6..e45702d88 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move_pair.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/alloc_move_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct D
     explicit D(int i) : B(i) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, std::unique_ptr<D>> T0;
@@ -52,4 +51,6 @@ int main()
         assert(std::get<0>(t1) == 2);
         assert(std::get<1>(t1)->id_ == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.fail.cpp
index b72f0fc2e..bb7c55735 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,6 +42,8 @@ std::tuple<ExplicitCopy> const_explicit_copy_no_brace() {
     // expected-error@-1 {{no viable conversion}}
 }
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.pass.cpp
index 0da132fcf..d4c29c93c 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -77,7 +76,7 @@ std::tuple<ImplicitCopy> testImplicitCopy3() {
     return i;
 }
 
-int main()
+int main(int, char**)
 {
     {
         // check that the literal '0' can implicitly initialize a stored pointer.
@@ -160,4 +159,6 @@ int main()
         assert(std::get<3>(t) == 0.0);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types2.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types2.fail.cpp
index 68b3fbd0d..8804c27b8 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types2.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_Types2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         std::tuple<int, char*, std::string, double&> t(2, nullptr, "text");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_pair.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_pair.pass.cpp
index bed161a3d..bbe51e392 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_pair.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<long, char> T0;
@@ -43,4 +42,6 @@ int main()
         static_assert(std::get<1>(t1) == short('a'), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_copy.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_copy.pass.cpp
index 4609b0425..41f73328a 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_copy.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ struct C
 
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<long> T0;
@@ -137,4 +136,6 @@ int main()
         std::tuple<Implicit> t2 = t1;
         assert(std::get<0>(t2).value == 42);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_move.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_move.pass.cpp
index 2af86fdd0..071f13cf9 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_move.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct D
     explicit D(int i) : B(i) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<long> T0;
@@ -101,4 +100,6 @@ int main()
         std::tuple<Implicit> t2 = std::move(t1);
         assert(std::get<0>(t2).value == 42);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.fail.cpp
index 1937f49ef..7eeb65a8f 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,11 +19,13 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<MoveOnly> T;
         T t0(MoveOnly(2));
         T t = t0;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.pass.cpp
index 1137df291..012781304 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/copy.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 struct Empty {};
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -67,4 +66,6 @@ int main()
         ((void)e); // Prevent unused warning
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp
index 731946608..ae296f739 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct IllFormedDefault {
     int value;
 };
 
-int main()
+int main(int, char**)
 {
     {
         std::tuple<> t;
@@ -107,4 +106,6 @@ int main()
         IllFormedDefault v(0);
         std::tuple<IllFormedDefault> t(v);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/dtor.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/dtor.pass.cpp
index b4fd2e264..80b09b871 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/dtor.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <cassert>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
   static_assert(std::is_trivially_destructible<
       std::tuple<> >::value, "");
@@ -36,4 +35,6 @@ int main()
       std::tuple<std::string> >::value, "");
   static_assert(!std::is_trivially_destructible<
       std::tuple<int, std::string> >::value, "");
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/implicit_deduction_guides.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/implicit_deduction_guides.pass.cpp
index 85036b591..3ff089a0b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/implicit_deduction_guides.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/implicit_deduction_guides.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -150,7 +149,9 @@ void test_empty_specialization()
   }
 }
 
-int main() {
+int main(int, char**) {
   test_primary_template();
   test_empty_specialization();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move.pass.cpp
index 1cc13cf58..977dc4c32 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -81,7 +80,7 @@ void test_sfinae() {
     }
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -122,4 +121,6 @@ int main()
         test_sfinae<move_only_ebo>();
         test_sfinae<move_only_large>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move_pair.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move_pair.pass.cpp
index 13558f3fb..635be614b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move_pair.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ struct D
     explicit D(int i) : B(i) {}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<long, std::unique_ptr<D>> T0;
@@ -45,4 +44,6 @@ int main()
         assert(std::get<0>(t1) == 2);
         assert(std::get<1>(t1)->id_ == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/test_lazy_sfinae.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/test_lazy_sfinae.pass.cpp
index 76f7e794a..bdbe4fc4b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/test_lazy_sfinae.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/test_lazy_sfinae.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -96,7 +95,9 @@ void test_const_Types_lazy_sfinae()
     assert(std::get<0>(t).value == 42);
 }
 
-int main() {
+int main(int, char**) {
     test_tuple_like_lazy_sfinae();
     test_const_Types_lazy_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/tuple_array_template_depth.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/tuple_array_template_depth.pass.cpp
index c069a0ba2..2f9447f2a 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/tuple_array_template_depth.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/tuple_array_template_depth.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,8 +28,10 @@
 typedef std::array<char, 1256> array_t;
 typedef std::tuple<array_t> tuple_t;
 
-int main()
+int main(int, char**)
 {
     array_t arr;
     tuple_t tup(arr);
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.creation/forward_as_tuple.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.creation/forward_as_tuple.pass.cpp
index 1099e3579..8dc1e48f8 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.creation/forward_as_tuple.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.creation/forward_as_tuple.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -65,7 +64,7 @@ test3(const Tuple&)
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         test0(std::forward_as_tuple());
@@ -85,4 +84,6 @@ int main()
         static_assert ( test3 (std::forward_as_tuple(i, c)) == 2, "" );
 #endif
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.creation/make_tuple.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.creation/make_tuple.pass.cpp
index 2c38bf7d2..444e978b0 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.creation/make_tuple.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.creation/make_tuple.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         int i = 0;
@@ -51,4 +50,6 @@ int main()
         static_assert (d1 == 3.14, "" );
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp
index 5dc98afe6..53ccc23b9 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ constexpr bool test_tie_constexpr() {
 }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         int i = 0;
@@ -61,4 +60,6 @@ int main()
         static_assert(test_tie_constexpr(), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
index 18095f7e3..40efbd1b8 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include "test_macros.h"
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         std::tuple<> t = std::tuple_cat();
@@ -239,4 +238,6 @@ int main()
         );
         assert(t2 == std::make_tuple(std::make_tuple(1), std::make_tuple(2)));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.fail.cpp
index 490283e7a..650303ff7 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<double&, std::string, int> T;
@@ -38,4 +37,6 @@ int main()
 
         std::get<1>(t) = "four";
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.pass.cpp
index f01491674..a280c500b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 struct Empty {};
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<int> T;
@@ -65,4 +64,6 @@ int main()
         assert(std::get<2>(t) == 5);
         assert(d == 2.5);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.fail.cpp
index 9c2d992b8..cf0e88246 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,11 +23,13 @@ template <class T> void cref(T const&&) = delete;
 
 std::tuple<int> const tup4() { return std::make_tuple(4); }
 
-int main()
+int main(int, char**)
 {
     // LWG2485: tuple should not open a hole in the type system, get() should
     // imitate [expr.ref]'s rules for accessing data members
     {
         cref(std::get<0>(tup4()));  // expected-error {{call to deleted function 'cref'}}
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.pass.cpp
index 720a90640..5801d5a5e 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::tuple<int> T;
@@ -77,4 +76,6 @@ int main()
     static_assert(std::get<1>(std::move(t)) == 5, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_non_const.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_non_const.pass.cpp
index fc5341289..3cbf01b25 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_non_const.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,7 +36,7 @@ struct S {
 constexpr std::tuple<int, int> getP () { return { 3, 4 }; }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<int> T;
@@ -82,4 +81,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_rv.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_rv.pass.cpp
index 6c456d430..ae968403b 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_rv.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<std::unique_ptr<int> > T;
@@ -30,4 +29,6 @@ int main()
         std::unique_ptr<int> p = std::get<0>(std::move(t));
         assert(*p == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.fail.cpp
index af9424806..51bf1d550 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,8 +31,10 @@ void test_bad_return_type() {
     upint p = std::get<upint>(t); // expected-error{{deleted copy constructor}}
 }
 
-int main()
+int main(int, char**)
 {
     test_bad_index();
     test_bad_return_type();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp
index 01ee1ca1f..7dd4e8f10 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::complex<float> cf;
     {
@@ -91,4 +90,6 @@ int main()
     static_assert(std::get<int>(std::move(t)) == 1, "");
     static_assert(std::get<const int>(std::move(t)) == 2, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
index 57da4b04c..a97e60ca7 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -41,7 +40,7 @@ void test()
     static_assert((std::is_same<typename std::tuple_element<idx, const volatile T>::type, const volatile U>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::array<int, 5>, 5, int, 0>();
     test<std::array<int, 5>, 5, int, 1>();
@@ -49,4 +48,6 @@ int main()
     test<std::array<volatile int, 4>, 4, volatile int, 3>();
     test<std::array<char *, 3>, 3, char *, 1>();
     test<std::array<char *, 3>, 3, char *, 2>();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp
index bd015ab5b..fdfb8b8b0 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.utility.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -39,7 +38,7 @@ void test()
     static_assert((std::is_same<typename std::tuple_element<idx, const volatile T>::type, const volatile U>::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::pair<int, int>, 2, int, 0>();
     test<std::pair<int, int>, 2, int, 1>();
@@ -47,4 +46,6 @@ int main()
     test<std::pair<int, volatile int>, 2, volatile int, 1>();
     test<std::pair<char *, int>, 2, char *, 0>();
     test<std::pair<char *, int>, 2, int,    1>();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp
index 4cb73573e..24b735b7e 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include <tuple>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     using T =  std::tuple<int, long, void*>;
     using E1 = typename std::tuple_element<1, T &>::type; // expected-error{{undefined template}}
@@ -31,4 +30,6 @@ int main()
     using E3 = typename std::tuple_element<4, T const>::type;
         // expected-error@__tuple:* 2 {{static_assert failed}}
 
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
index 5beedbe9d..5ad2b0822 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ void test()
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     test<std::tuple<int>, 0, int>();
     test<std::tuple<char, int>, 0, char>();
@@ -48,4 +47,6 @@ int main()
     test<std::tuple<int*, char, int>, 0, int*>();
     test<std::tuple<int*, char, int>, 1, char>();
     test<std::tuple<int*, char, int>, 2, int>();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.fail.cpp
index 3f132e47b..9b065b3b9 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,9 +18,11 @@
 
 #include <tuple>
 
-int main()
+int main(int, char**)
 {
     (void)std::tuple_size<std::tuple<> &>::value; // expected-error {{implicit instantiation of undefined template}}
     (void)std::tuple_size<int>::value; // expected-error {{implicit instantiation of undefined template}}
     (void)std::tuple_size<std::tuple<>*>::value; // expected-error {{implicit instantiation of undefined template}}
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp
index 49b4215a1..f27c7eb47 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,10 +32,12 @@ void test()
                                    std::tuple_size<const volatile T> >::value), "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::tuple<>, 0>();
     test<std::tuple<int>, 1>();
     test<std::tuple<char, int>, 2>();
     test<std::tuple<char, char*, int>, 3>();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp
index 818001833..83b773abf 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,7 @@
 // template <class... Types> class tuple;
 
 // template <class... Types>
-//   class tuple_size<tuple<Types...>>
+//   struct tuple_size<tuple<Types...>>
 //     : public integral_constant<size_t, sizeof...(Types)> { };
 
 // UNSUPPORTED: c++98, c++03
@@ -26,21 +25,21 @@ struct Dummy2 {};
 struct Dummy3 {};
 
 template <>
-class std::tuple_size<Dummy1> {
+struct std::tuple_size<Dummy1> {
 public:
   static size_t value;
 };
 
 template <>
-class std::tuple_size<Dummy2> {
+struct std::tuple_size<Dummy2> {
 public:
   static void value() {}
 };
 
 template <>
-class std::tuple_size<Dummy3> {};
+struct std::tuple_size<Dummy3> {};
 
-int main()
+int main(int, char**)
 {
   // Test that tuple_size<const T> is not incomplete when tuple_size<T>::value
   // is well-formed but not a constant expression.
@@ -60,4 +59,6 @@ int main()
     // expected-error@__tuple:* 1 {{no member named 'value'}}
     (void)std::tuple_size<const Dummy3>::value; // expected-note {{here}}
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp
index ccdd48e4c..32bad3317 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_incomplete.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,7 @@
 // template <class... Types> class tuple;
 
 // template <class... Types>
-//   class tuple_size<tuple<Types...>>
+//   struct tuple_size<tuple<Types...>>
 //     : public integral_constant<size_t, sizeof...(Types)> { };
 
 // XFAIL: gcc-4.9
@@ -31,7 +30,7 @@ struct Dummy1 {};
 struct Dummy2 {};
 
 namespace std {
-template <> class tuple_size<Dummy1> : public integral_constant<size_t, 0> {};
+template <> struct tuple_size<Dummy1> : public integral_constant<size_t, 0> {};
 }
 
 template <class T>
@@ -51,7 +50,7 @@ void test_incomplete() {
 }
 
 
-int main()
+int main(int, char**)
 {
   test_complete<std::tuple<> >();
   test_complete<std::tuple<int&> >();
@@ -64,4 +63,6 @@ int main()
   test_incomplete<int>();
   test_incomplete<std::tuple<int>&>();
   test_incomplete<Dummy2>();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
index 03fb78caa..00f7ff269 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -12,7 +11,7 @@
 // template <class... Types> class tuple;
 
 // template <class... Types>
-//   class tuple_size<tuple<Types...>>
+//   struct tuple_size<tuple<Types...>>
 //     : public integral_constant<size_t, sizeof...(Types)> { };
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
@@ -129,7 +128,7 @@ void test_before_tuple_size_specialization() {
 }
 
 template <>
-class std::tuple_size<Test> {
+struct std::tuple_size<Test> {
 public:
   static const size_t value = 1;
 };
@@ -140,11 +139,13 @@ void test_after_tuple_size_specialization() {
   assert(p == -1);
 }
 
-int main() {
+int main(int, char**) {
   test_decomp_user_type();
   test_decomp_tuple();
   test_decomp_pair();
   test_decomp_array();
   test_before_tuple_size_specialization();
   test_after_tuple_size_specialization();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.fail.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.fail.cpp
index 957a683b4..8bd3fbd57 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.fail.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,10 +16,12 @@
 
 #include <tuple>
 
-int main()
+int main(int, char**)
 {
     (void)std::tuple_size_v<std::tuple<> &>; // expected-note {{requested here}}
     (void)std::tuple_size_v<int>; // expected-note {{requested here}}
     (void)std::tuple_size_v<std::tuple<>*>; // expected-note {{requested here}}
     // expected-error@tuple:* 3 {{implicit instantiation of undefined template}}
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.pass.cpp
index 24878a1d5..bd01f4949 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_v.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ void test()
     static_assert(std::tuple_size_v<Tuple const volatile> == std::tuple_size<Tuple>::value, "");
 }
 
-int main()
+int main(int, char**)
 {
     test<std::tuple<>, 0>();
 
@@ -40,4 +39,6 @@ int main()
 
     test<std::tuple<int, int, int>, 3>();
     test<std::array<int, 3>, 3>();
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_value_sfinae.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_value_sfinae.pass.cpp
index 31ebe5878..2efbfa50e 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_value_sfinae.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_value_sfinae.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ template <class T> constexpr bool has_value() { return has_value<T>(0); }
 
 struct Dummy {};
 
-int main() {
+int main(int, char**) {
   // Test that the ::value member does not exist
   static_assert(has_value<std::tuple<int> const>(), "");
   static_assert(has_value<std::pair<int, long> volatile>(), "");
@@ -36,4 +35,6 @@ int main() {
   static_assert(!has_value<const int>(), "");
   static_assert(!has_value<volatile void>(), "");
   static_assert(!has_value<const volatile std::tuple<int>&>(), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.rel/eq.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.rel/eq.pass.cpp
index a802a05da..0302c839e 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.rel/eq.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.rel/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T1;
@@ -155,4 +154,6 @@ int main()
         static_assert(t1 != t2, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.rel/lt.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.rel/lt.pass.cpp
index f4d764b87..64ed9b4a9 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.rel/lt.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.rel/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T1;
@@ -209,4 +208,6 @@ int main()
         static_assert(!(t1 >= t2), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.special/non_member_swap.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.special/non_member_swap.pass.cpp
index dcae60612..eee8f1819 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.special/non_member_swap.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.special/non_member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -59,4 +58,6 @@ int main()
         assert(std::get<1>(t1) == 1);
         assert(std::get<2>(t1) == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.swap/member_swap.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.swap/member_swap.pass.cpp
index 6749f592a..951a88726 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.swap/member_swap.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.swap/member_swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "MoveOnly.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -58,4 +57,6 @@ int main()
         assert(std::get<1>(t1) == 1);
         assert(std::get<2>(t1) == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.traits/uses_allocator.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.traits/uses_allocator.pass.cpp
index ddaf52fea..b04c491ed 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.traits/uses_allocator.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.traits/uses_allocator.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 
 struct A {};
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::tuple<> T;
@@ -43,4 +42,6 @@ int main()
         static_assert((std::is_base_of<std::true_type,
                                        std::uses_allocator<T, A>>::value), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.hash/enabled_hash.pass.cpp b/test/std/utilities/type.index/type.index.hash/enabled_hash.pass.cpp
index 26bada38f..710b33878 100644
--- a/test/std/utilities/type.index/type.index.hash/enabled_hash.pass.cpp
+++ b/test/std/utilities/type.index/type.index.hash/enabled_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,6 +17,8 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.hash/hash.pass.cpp b/test/std/utilities/type.index/type.index.hash/hash.pass.cpp
index 14bf08412..8192a9020 100644
--- a/test/std/utilities/type.index/type.index.hash/hash.pass.cpp
+++ b/test/std/utilities/type.index/type.index.hash/hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <type_traits>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::hash<std::type_index> H;
     static_assert((std::is_same<typename H::argument_type, std::type_index>::value), "" );
@@ -30,4 +29,6 @@ int main()
 
     std::type_index t1 = typeid(int);
     assert(std::hash<std::type_index>()(t1) == t1.hash_code());
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.members/ctor.pass.cpp b/test/std/utilities/type.index/type.index.members/ctor.pass.cpp
index e5183eb87..c133130f1 100644
--- a/test/std/utilities/type.index/type.index.members/ctor.pass.cpp
+++ b/test/std/utilities/type.index/type.index.members/ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,9 +16,11 @@
 #include <typeindex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::type_info const & info = typeid(int);
     std::type_index t1(info);
     assert(t1.name() == info.name());
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.members/eq.pass.cpp b/test/std/utilities/type.index/type.index.members/eq.pass.cpp
index b6bbd1d23..97f6448b7 100644
--- a/test/std/utilities/type.index/type.index.members/eq.pass.cpp
+++ b/test/std/utilities/type.index/type.index.members/eq.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,11 +16,13 @@
 #include <typeindex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::type_index t1 = typeid(int);
     std::type_index t2 = typeid(int);
     std::type_index t3 = typeid(long);
     assert(t1 == t2);
     assert(t1 != t3);
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.members/hash_code.pass.cpp b/test/std/utilities/type.index/type.index.members/hash_code.pass.cpp
index b4f316830..0619ff754 100644
--- a/test/std/utilities/type.index/type.index.members/hash_code.pass.cpp
+++ b/test/std/utilities/type.index/type.index.members/hash_code.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <typeindex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::type_info& ti = typeid(int);
     std::type_index t1 = typeid(int);
     assert(t1.hash_code() == ti.hash_code());
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.members/lt.pass.cpp b/test/std/utilities/type.index/type.index.members/lt.pass.cpp
index c099d1c56..e24b3975e 100644
--- a/test/std/utilities/type.index/type.index.members/lt.pass.cpp
+++ b/test/std/utilities/type.index/type.index.members/lt.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,7 +18,7 @@
 #include <typeindex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::type_index t1 = typeid(int);
     std::type_index t2 = typeid(int);
@@ -42,4 +41,6 @@ int main()
         assert( (t1 >  t3));
         assert( (t1 >= t3));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.members/name.pass.cpp b/test/std/utilities/type.index/type.index.members/name.pass.cpp
index 44ee21519..ee91629b3 100644
--- a/test/std/utilities/type.index/type.index.members/name.pass.cpp
+++ b/test/std/utilities/type.index/type.index.members/name.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,9 +16,11 @@
 #include <string>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     const std::type_info& ti = typeid(int);
     std::type_index t1 = typeid(int);
     assert(std::string(t1.name()) == ti.name());
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.overview/copy_assign.pass.cpp b/test/std/utilities/type.index/type.index.overview/copy_assign.pass.cpp
index 234e26b49..72cae39d0 100644
--- a/test/std/utilities/type.index/type.index.overview/copy_assign.pass.cpp
+++ b/test/std/utilities/type.index/type.index.overview/copy_assign.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,11 +15,13 @@
 #include <typeindex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::type_index t1(typeid(int));
     std::type_index t2(typeid(double));
     assert(t2 != t1);
     t2 = t1;
     assert(t2 == t1);
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.overview/copy_ctor.pass.cpp b/test/std/utilities/type.index/type.index.overview/copy_ctor.pass.cpp
index 499c4b63b..df0df2e8c 100644
--- a/test/std/utilities/type.index/type.index.overview/copy_ctor.pass.cpp
+++ b/test/std/utilities/type.index/type.index.overview/copy_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,9 +15,11 @@
 #include <typeindex>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     std::type_index t1(typeid(int));
     std::type_index t2 = t1;
     assert(t2 == t1);
+
+  return 0;
 }
diff --git a/test/std/utilities/type.index/type.index.synopsis/hash_type_index.pass.cpp b/test/std/utilities/type.index/type.index.synopsis/hash_type_index.pass.cpp
index 9ab58ea6c..e8ce292cc 100644
--- a/test/std/utilities/type.index/type.index.synopsis/hash_type_index.pass.cpp
+++ b/test/std/utilities/type.index/type.index.synopsis/hash_type_index.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -23,7 +22,7 @@
 #include "poisoned_hash_helper.hpp"
 #endif
 
-int main()
+int main(int, char**)
 {
   {
     typedef std::hash<std::type_index> H;
@@ -35,4 +34,6 @@ int main()
     test_hash_enabled_for_type<std::type_index>(std::type_index(typeid(int)));
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utilities.general/nothing_to_do.pass.cpp b/test/std/utilities/utilities.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utilities.general/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utilities.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility.requirements/allocator.requirements/nothing_to_do.pass.cpp b/test/std/utilities/utility.requirements/allocator.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility.requirements/allocator.requirements/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility.requirements/allocator.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility.requirements/hash.requirements/nothing_to_do.pass.cpp b/test/std/utilities/utility.requirements/hash.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility.requirements/hash.requirements/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility.requirements/hash.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility.requirements/nothing_to_do.pass.cpp b/test/std/utilities/utility.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility.requirements/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility.requirements/nullablepointer.requirements/nothing_to_do.pass.cpp b/test/std/utilities/utility.requirements/nullablepointer.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility.requirements/nullablepointer.requirements/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility.requirements/nullablepointer.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility.requirements/swappable.requirements/nothing_to_do.pass.cpp b/test/std/utilities/utility.requirements/swappable.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility.requirements/swappable.requirements/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility.requirements/swappable.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility.requirements/utility.arg.requirements/nothing_to_do.pass.cpp b/test/std/utilities/utility.requirements/utility.arg.requirements/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility.requirements/utility.arg.requirements/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility.requirements/utility.arg.requirements/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/as_const/as_const.fail.cpp b/test/std/utilities/utility/as_const/as_const.fail.cpp
index c28957cfc..1bb2e64c3 100644
--- a/test/std/utilities/utility/as_const/as_const.fail.cpp
+++ b/test/std/utilities/utility/as_const/as_const.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,9 @@
 
 struct S {int i;};
 
-int main()
+int main(int, char**)
 {
     std::as_const(S{});
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/as_const/as_const.pass.cpp b/test/std/utilities/utility/as_const/as_const.pass.cpp
index 268f2d1b0..32d240a0b 100644
--- a/test/std/utilities/utility/as_const/as_const.pass.cpp
+++ b/test/std/utilities/utility/as_const/as_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -35,7 +34,7 @@ void test(T& t)
     assert(std::as_const<const volatile T>(t) == t);
 }
 
-int main()
+int main(int, char**)
 {
     int i = 3;
     double d = 4.0;
@@ -43,4 +42,6 @@ int main()
     test(i);
     test(d);
     test(s);
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/declval/declval.pass.cpp b/test/std/utilities/utility/declval/declval.pass.cpp
index aabd0e6f6..6509fd437 100644
--- a/test/std/utilities/utility/declval/declval.pass.cpp
+++ b/test/std/utilities/utility/declval/declval.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,11 +21,13 @@ class A
     A& operator=(const A&);
 };
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     static_assert((std::is_same<decltype(std::declval<A>()), A&&>::value), "");
 #else
     static_assert((std::is_same<decltype(std::declval<A>()), A&>::value), "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/exchange/exchange.pass.cpp b/test/std/utilities/utility/exchange/exchange.pass.cpp
index 1a5007ea4..41e8abb43 100644
--- a/test/std/utilities/utility/exchange/exchange.pass.cpp
+++ b/test/std/utilities/utility/exchange/exchange.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ TEST_CONSTEXPR bool test_constexpr() {
 
 
 
-int main()
+int main(int, char**)
 {
     {
     int v = 12;
@@ -81,4 +80,6 @@ int main()
 #if TEST_STD_VER > 17
     static_assert(test_constexpr());
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/forward/forward.fail.cpp b/test/std/utilities/utility/forward/forward.fail.cpp
index c845216d8..4efc1b6aa 100644
--- a/test/std/utilities/utility/forward/forward.fail.cpp
+++ b/test/std/utilities/utility/forward/forward.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@ struct A
 A source() {return A();}
 const A csource() {return A();}
 
-int main()
+int main(int, char**)
 {
 #if TEST_STD_VER >= 11
     {
@@ -50,4 +49,6 @@ int main()
         A a;
         std::forward(a); // expected-error {{no matching function for call to 'forward'}}
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/forward/forward.pass.cpp b/test/std/utilities/utility/forward/forward.pass.cpp
index afff8d627..b2f7c9603 100644
--- a/test/std/utilities/utility/forward/forward.pass.cpp
+++ b/test/std/utilities/utility/forward/forward.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ constexpr bool test_constexpr_forward() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     A a;
     const A ca = A();
@@ -88,4 +87,6 @@ int main()
     static_assert(std::forward<const int&>(i2) == 42, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/forward/forward_03.pass.cpp b/test/std/utilities/utility/forward/forward_03.pass.cpp
index 7e141bad9..522382dc7 100644
--- a/test/std/utilities/utility/forward/forward_03.pass.cpp
+++ b/test/std/utilities/utility/forward/forward_03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@ struct eight {one _[8];};
 one test(A&);
 two test(const A&);
 
-int main()
+int main(int, char**)
 {
     A a;
     const A ca = A();
@@ -55,4 +54,6 @@ int main()
     static_assert(sizeof(test(std::forward<const A>(ca))) == 2, "");
     static_assert(sizeof(test(std::forward<const A>(csource()))) == 2, "");
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/forward/move.fail.cpp b/test/std/utilities/utility/forward/move.fail.cpp
index bd2126cba..86f3cc3e5 100644
--- a/test/std/utilities/utility/forward/move.fail.cpp
+++ b/test/std/utilities/utility/forward/move.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,10 +24,12 @@ const move_only csource() {return move_only();}
 
 void test(move_only) {}
 
-int main()
+int main(int, char**)
 {
     move_only a;
     const move_only ca = move_only();
 
     test(std::move(ca)); // c
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/forward/move.pass.cpp b/test/std/utilities/utility/forward/move.pass.cpp
index e2edc2a2a..3db61cda2 100644
--- a/test/std/utilities/utility/forward/move.pass.cpp
+++ b/test/std/utilities/utility/forward/move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ constexpr bool test_constexpr_move() {
 #endif
 }
 
-int main()
+int main(int, char**)
 {
     { // Test return type and noexcept.
         static_assert(std::is_same<decltype(std::move(x)), int&&>::value, "");
@@ -118,4 +117,6 @@ int main()
         static_assert(std::move(y) == 42, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/forward/move_if_noexcept.pass.cpp b/test/std/utilities/utility/forward/move_if_noexcept.pass.cpp
index bc60d3d27..11ea3c58f 100644
--- a/test/std/utilities/utility/forward/move_if_noexcept.pass.cpp
+++ b/test/std/utilities/utility/forward/move_if_noexcept.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@ struct legacy
     legacy(const legacy&);
 };
 
-int main()
+int main(int, char**)
 {
     int i = 0;
     const int ci = 0;
@@ -72,4 +71,6 @@ int main()
     static_assert(i2 == 23, "" );
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/operators/rel_ops.pass.cpp b/test/std/utilities/utility/operators/rel_ops.pass.cpp
index 26e766592..42e808665 100644
--- a/test/std/utilities/utility/operators/rel_ops.pass.cpp
+++ b/test/std/utilities/utility/operators/rel_ops.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -33,7 +32,7 @@ operator < (const A& x, const A& y)
     return x.data_ < y.data_;
 }
 
-int main()
+int main(int, char**)
 {
     using namespace std::rel_ops;
     A a1(1);
@@ -46,4 +45,6 @@ int main()
     assert(a1 <= a2);
     assert(a2 >= a2);
     assert(a2 >= a1);
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/nothing_to_do.pass.cpp b/test/std/utilities/utility/pairs/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility/pairs/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility/pairs/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/get_const.fail.cpp b/test/std/utilities/utility/pairs/pair.astuple/get_const.fail.cpp
index dbe1c2668..e186514f0 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/get_const.fail.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/get_const.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include <utility>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P;
@@ -27,4 +26,6 @@ int main()
         assert(std::get<1>(p) == 4);
         std::get<0>(p) = 5;
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/get_const.pass.cpp b/test/std/utilities/utility/pairs/pair.astuple/get_const.pass.cpp
index c09c8815e..d9747b337 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/get_const.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/get_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -20,7 +19,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P;
@@ -37,4 +36,6 @@ int main()
         static_assert(std::get<1>(p1) == 4, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/get_const_rv.pass.cpp b/test/std/utilities/utility/pairs/pair.astuple/get_const_rv.pass.cpp
index 5c38318d2..a477c5150 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/get_const_rv.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/get_const_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
     typedef std::pair<std::unique_ptr<int>, short> P;
@@ -63,4 +62,6 @@ int main()
     static_assert(std::get<1>(std::move(p1)) == 4, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/get_non_const.pass.cpp b/test/std/utilities/utility/pairs/pair.astuple/get_non_const.pass.cpp
index 2f8b6c1e8..6119cd5c8 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/get_non_const.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/get_non_const.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct S {
 constexpr std::pair<int, int> getP () { return { 3, 4 }; }
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P;
@@ -50,4 +49,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/get_rv.pass.cpp b/test/std/utilities/utility/pairs/pair.astuple/get_rv.pass.cpp
index 0601e4e73..e0ce55bba 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/get_rv.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/get_rv.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include <memory>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<std::unique_ptr<int>, short> P;
@@ -29,4 +28,6 @@ int main()
         std::unique_ptr<int> ptr = std::get<0>(std::move(p));
         assert(*ptr == 3);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp
index f4a623226..f2d3359e7 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::complex<float> cf;
     {
@@ -82,4 +81,6 @@ int main()
     static_assert(std::get<int>(std::move(p)) == 1, "");
     static_assert(std::get<const int>(std::move(p)) == 2, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.fail.cpp b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.fail.cpp
index f0d55a661..dce209921 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.fail.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type1.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,9 +12,11 @@
 
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::complex<float> cf;
     auto t1 = std::make_pair<int, double> ( 42, 3.4 );
     assert (( std::get<cf>(t1) == cf {1,2} ));  // no such type
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.fail.cpp b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.fail.cpp
index 72e637592..4c2ea88e6 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.fail.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type2.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,9 +12,11 @@
 
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::complex<float> cf;
     auto t1 = std::make_pair<int, int> ( 42, 43 );
     assert ( std::get<int>(t1) == 42 ); // two ints
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.fail.cpp b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.fail.cpp
index d5179e435..e30b787e1 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.fail.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/pairs.by.type3.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,9 +12,11 @@
 
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     typedef std::unique_ptr<int> upint;
     std::pair<upint, int> t(upint(new int(4)), 23);
     upint p = std::get<upint>(t);
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/tuple_element.fail.cpp b/test/std/utilities/utility/pairs/pair.astuple/tuple_element.fail.cpp
index 4ca31f7de..e53ca898d 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/tuple_element.fail.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/tuple_element.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,8 +14,10 @@
 
 #include <utility>
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<int, short> T;
     std::tuple_element<2, T>::type foo; // expected-error@utility:* {{Index out of bounds in std::tuple_element<std::pair<T1, T2>>}}
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/tuple_element.pass.cpp b/test/std/utilities/utility/pairs/pair.astuple/tuple_element.pass.cpp
index 5ac838b37..1e41e3fda 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/tuple_element.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/tuple_element.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -48,8 +47,10 @@ void test()
     }
 }
 
-int main()
+int main(int, char**)
 {
     test<int, short>();
     test<int*, char>();
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.astuple/tuple_size.pass.cpp b/test/std/utilities/utility/pairs/pair.astuple/tuple_size.pass.cpp
index 3756e963f..3b95b4749 100644
--- a/test/std/utilities/utility/pairs/pair.astuple/tuple_size.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.astuple/tuple_size.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,7 +14,7 @@
 
 #include <utility>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -33,4 +32,6 @@ int main()
         typedef std::pair<int, short> const volatile P1;
         static_assert((std::tuple_size<P1>::value == 2), "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct.pass.cpp b/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct.pass.cpp
index 12968de2d..98f864caf 100644
--- a/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct.pass.cpp
+++ b/test/std/utilities/utility/pairs/pair.piecewise/piecewise_construct.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -42,7 +41,7 @@ public:
     unsigned get_u2() const {return u2_;}
 };
 
-int main()
+int main(int, char**)
 {
     std::pair<A, B> p(std::piecewise_construct,
                       std::make_tuple(4, 'a'),
@@ -52,4 +51,6 @@ int main()
     assert(p.second.get_d() == 3.5);
     assert(p.second.get_u1() == 6u);
     assert(p.second.get_u2() == 2u);
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.general/nothing_to_do.pass.cpp b/test/std/utilities/utility/pairs/pairs.general/nothing_to_do.pass.cpp
index b58f5c55b..1f764da05 100644
--- a/test/std/utilities/utility/pairs/pairs.general/nothing_to_do.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.general/nothing_to_do.pass.cpp
@@ -1,12 +1,13 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/U_V.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/U_V.pass.cpp
index 1ef2d9402..0f22808de 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/U_V.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ struct ImplicitT {
 };
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<std::unique_ptr<int>, short*> P;
@@ -97,4 +96,6 @@ int main()
         static_assert(p.second.value == 43, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/assign_const_pair_U_V.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/assign_const_pair_U_V.pass.cpp
index 90722c393..834d73dd7 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/assign_const_pair_U_V.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/assign_const_pair_U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@
 #include "archetypes.hpp"
 #endif
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -49,4 +48,6 @@ int main()
        assert(p.second.value == -42);
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/assign_pair.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/assign_pair.pass.cpp
index 3f7066310..f4dfe5e1b 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/assign_pair.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/assign_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -50,7 +49,7 @@ int CountAssign::moved = 0;
 struct Incomplete;
 extern Incomplete inc_obj;
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<CopyAssignable, short> P;
@@ -95,6 +94,8 @@ int main()
         P p(42, inc_obj);
         assert(&p.second == &inc_obj);
     }
+
+  return 0;
 }
 
 struct Incomplete {};
diff --git a/test/std/utilities/utility/pairs/pairs.pair/assign_pair_cxx03.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/assign_pair_cxx03.pass.cpp
index cf1afff90..47f85eaa6 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/assign_pair_cxx03.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/assign_pair_cxx03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ private:
 struct Incomplete;
 extern Incomplete inc_obj;
 
-int main()
+int main(int, char**)
 {
     {
     // Test that we don't constrain the assignment operator in C++03 mode.
@@ -43,6 +42,8 @@ int main()
     P p(42, inc_obj);
     assert(&p.second == &inc_obj);
     }
+
+  return 0;
 }
 
 struct Incomplete {};
diff --git a/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair.pass.cpp
index f02e24b24..b4f0c0109 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -46,7 +45,7 @@ struct CountAssign {
 int CountAssign::copied = 0;
 int CountAssign::moved = 0;
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<std::unique_ptr<int>, int> P;
@@ -93,4 +92,6 @@ int main()
         assert(CountAssign::moved == 1);
         assert(CountAssign::copied == 0);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair_U_V.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair_U_V.pass.cpp
index b7a89a844..0be0a4e95 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair_U_V.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/assign_rv_pair_U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,7 +29,7 @@ struct Derived
 {
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<std::unique_ptr<Derived>, short> P1;
@@ -56,4 +55,6 @@ int main()
        assert(p.first == 42);
        assert(p.second.value == -42);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp
index bf19d1abe..e147d7558 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -47,7 +46,7 @@ void test_sfinae() {
     static_assert(test_convertible<P2,   T2,   T1Arg>() == CanConvert, "");
 }
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<float, short*> P;
@@ -95,4 +94,6 @@ int main()
         static_assert(p.second == 10, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second_cxx03.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second_cxx03.pass.cpp
index 8c56c2003..880179723 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second_cxx03.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/const_first_const_second_cxx03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ public:
     bool operator==(const A& a) const {return data_ == a.data_;}
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<float, short*> P;
@@ -39,4 +38,6 @@ int main()
         assert(p.first == A(1));
         assert(p.second == 2);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
index d2cb6b109..ce1e86c1a 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -54,7 +53,7 @@ struct ImplicitT {
   int value;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, int> P1;
@@ -178,4 +177,6 @@ int main()
         static_assert(p2.second.value == 101, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V_cxx03.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V_cxx03.pass.cpp
index fbf461f9b..9f6498806 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V_cxx03.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/const_pair_U_V_cxx03.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 #include <utility>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -26,4 +25,6 @@ int main()
         assert(p2.first == 3);
         assert(p2.second == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/copy_ctor.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/copy_ctor.pass.cpp
index 1003f3c8b..81a32901a 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/copy_ctor.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/copy_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -36,4 +35,6 @@ int main()
         static_assert(p2.second == 4, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/default-sfinae.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/default-sfinae.pass.cpp
index d5e1e232f..70557aa92 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/default-sfinae.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/default-sfinae.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -140,7 +139,7 @@ void test_illformed_default()
 }
 
 
-int main()
+int main(int, char**)
 {
     {
         // Check that pair<T, U> can still be used even if
@@ -161,4 +160,6 @@ int main()
         test_is_default_constructible<int>();
         test_is_default_constructible<DefaultSFINAES<int>>();
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/default.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/default.pass.cpp
index af91abe74..dc1f37b66 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/default.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/default.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -29,7 +28,7 @@
 #include "test_macros.h"
 #include "archetypes.hpp"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<float, short*> P;
@@ -52,4 +51,6 @@ int main()
         static_assert(!std::is_default_constructible<P2>::value, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/dtor.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/dtor.pass.cpp
index b25099f4d..268ec4294 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/dtor.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/dtor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,10 +26,12 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
   static_assert((std::is_trivially_destructible<
       std::pair<int, float> >::value), "");
   static_assert((!std::is_trivially_destructible<
       std::pair<int, std::string> >::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp
index 7933dd99c..ca5a72884 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/implicit_deduction_guides.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -40,7 +39,7 @@
 // (6)  explicit pair(pair<U1, U2> const&) -> pair<U1, U2>
 // (7)  pair(pair<U1, U2> &&) -> pair<U1, U2>
 // (8)  explicit pair(pair<U1, U2> &&) -> pair<U1, U2>
-int main()
+int main(int, char**)
 {
   using E = ExplicitTestTypes::TestType;
   static_assert(!std::is_convertible<E const&, E>::value, "");
@@ -77,4 +76,6 @@ int main()
     std::pair p1(std::move(p));
     ASSERT_SAME_TYPE(decltype(p1), std::pair<std::string, E>);
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/move_ctor.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/move_ctor.pass.cpp
index 99e00b025..53d81ac7a 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/move_ctor.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/move_ctor.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@ struct Dummy {
   Dummy(Dummy &&) = default;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -41,4 +40,6 @@ int main()
         static_assert(!std::is_copy_constructible<P>::value, "");
         static_assert(std::is_move_constructible<P>::value, "");
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/not_constexpr_cxx11.fail.cpp b/test/std/utilities/utility/pairs/pairs.pair/not_constexpr_cxx11.fail.cpp
index 3704dcc32..88d0f9649 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/not_constexpr_cxx11.fail.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/not_constexpr_cxx11.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -28,7 +27,7 @@ struct ImplicitT {
   int value;
 };
 
-int main()
+int main(int, char**)
 {
     {
         using P = std::pair<int, int>;
@@ -54,4 +53,6 @@ int main()
         constexpr P U_V = {42, 101}; // expected-error {{must be initialized by a constant expression}}
         constexpr P pair_U_V = other; // expected-error {{must be initialized by a constant expression}}
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp
index aa86949dd..26b02f383 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,7 +21,7 @@
 #include <utility>
 
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, int*> P1;
@@ -33,4 +32,6 @@ int main()
         assert(p3.first == P1(3, nullptr));
         assert(p3.second == P2(nullptr, 4));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
index 7e40bed21..0e3d9a1cb 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/rv_pair_U_V.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -64,7 +63,7 @@ struct ImplicitT {
   int value;
 };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<std::unique_ptr<Derived>, int> P1;
@@ -174,4 +173,6 @@ int main()
         static_assert(p2.second.value == 43, "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/special_member_generation_test.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/special_member_generation_test.pass.cpp
index 1331a3153..db174e829 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/special_member_generation_test.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/special_member_generation_test.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -121,7 +120,9 @@ void test_assignment_operator_exists() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_constructors_exist();
   test_assignment_operator_exists();
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/swap.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/swap.pass.cpp
index 95b1f66d6..faaae1bc2 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/swap.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +24,7 @@ struct S {
     bool operator==(int x) const { return i == x; }
     };
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -47,4 +46,6 @@ int main()
         assert(p2.first == 3);
         assert(p2.second == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/trivial_copy_move.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/trivial_copy_move.pass.cpp
index 200f044c6..6841f2865 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/trivial_copy_move.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/trivial_copy_move.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,7 +26,7 @@ struct Dummy {
   Dummy(Dummy &&) = default;
 };
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<int, short> P;
     {
@@ -53,4 +52,6 @@ int main()
 #endif
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.pair/types.pass.cpp b/test/std/utilities/utility/pairs/pairs.pair/types.pass.cpp
index c16bd71ff..25108de5b 100644
--- a/test/std/utilities/utility/pairs/pairs.pair/types.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.pair/types.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,9 +17,11 @@
 #include <utility>
 #include <type_traits>
 
-int main()
+int main(int, char**)
 {
     typedef std::pair<float, short*> P;
     static_assert((std::is_same<P::first_type, float>::value), "");
     static_assert((std::is_same<P::second_type, short*>::value), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp b/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp
index 3b994dfd4..12d6ab019 100644
--- a/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.spec/comparison.pass.cpp
@@ -23,7 +23,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P;
@@ -94,4 +94,6 @@ int main()
         static_assert( (p1 >= p2), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.spec/make_pair.pass.cpp b/test/std/utilities/utility/pairs/pairs.spec/make_pair.pass.cpp
index 3586243f8..dff26e57f 100644
--- a/test/std/utilities/utility/pairs/pairs.spec/make_pair.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.spec/make_pair.pass.cpp
@@ -17,7 +17,7 @@
 
 #include "test_macros.h"
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -49,4 +49,6 @@ int main()
     }
 #endif
 
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/pairs/pairs.spec/non_member_swap.pass.cpp b/test/std/utilities/utility/pairs/pairs.spec/non_member_swap.pass.cpp
index 62fa94247..874327672 100644
--- a/test/std/utilities/utility/pairs/pairs.spec/non_member_swap.pass.cpp
+++ b/test/std/utilities/utility/pairs/pairs.spec/non_member_swap.pass.cpp
@@ -16,7 +16,7 @@
 #include <utility>
 #include <cassert>
 
-int main()
+int main(int, char**)
 {
     {
         typedef std::pair<int, short> P1;
@@ -28,4 +28,6 @@ int main()
         assert(p2.first == 3);
         assert(p2.second == 4);
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/synopsis.pass.cpp b/test/std/utilities/utility/synopsis.pass.cpp
index 009b65cbb..5a703e1b2 100644
--- a/test/std/utilities/utility/synopsis.pass.cpp
+++ b/test/std/utilities/utility/synopsis.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,9 +13,11 @@
 
 #include <utility>
 
-int main()
+int main(int, char**)
 {
     std::initializer_list<int> x;
     (void)x;
+
+  return 0;
 }
 
diff --git a/test/std/utilities/utility/utility.inplace/inplace.pass.cpp b/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
index e87c6f399..155b2c0eb 100644
--- a/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
+++ b/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -43,7 +42,7 @@ constexpr bool check_tag(Up) {
         && std::is_same<Tp, Up>::value;
 }
 
-int main() {
+int main(int, char**) {
     // test in_place_t
     {
         using T = std::in_place_t;
@@ -71,4 +70,6 @@ int main() {
         static_assert(check_tag<T2>(std::in_place_index<1>));
         static_assert(check_tag<T3>(std::in_place_index<static_cast<size_t>(-1)>));
     }
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/utility.swap/swap.pass.cpp b/test/std/utilities/utility/utility.swap/swap.pass.cpp
index c9c9f3b52..f52af4cb8 100644
--- a/test/std/utilities/utility/utility.swap/swap.pass.cpp
+++ b/test/std/utilities/utility/utility.swap/swap.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,7 +62,7 @@ constexpr bool can_swap() {
 }
 #endif
 
-int main()
+int main(int, char**)
 {
 
     {
@@ -100,4 +99,6 @@ int main()
         static_assert(noexcept(std::swap(nm, nm)), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/utility/utility.swap/swap_array.pass.cpp b/test/std/utilities/utility/utility.swap/swap_array.pass.cpp
index ad39934b2..015e85a01 100644
--- a/test/std/utilities/utility/utility.swap/swap_array.pass.cpp
+++ b/test/std/utilities/utility/utility.swap/swap_array.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -55,7 +54,7 @@ constexpr bool can_swap() {
 #endif
 
 
-int main()
+int main(int, char**)
 {
     {
         int i[3] = {1, 2, 3};
@@ -98,4 +97,6 @@ int main()
         static_assert(noexcept(std::swap(ma, ma)), "");
     }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp b/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
index 4e76e12b9..4cb79a22c 100644
--- a/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
+++ b/test/std/utilities/variant/variant.bad_variant_access/bad_variant_access.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access
 
 
 // <variant>
@@ -36,11 +29,13 @@ public:
 #include <type_traits>
 #include <variant>
 
-int main() {
+int main(int, char**) {
   static_assert(std::is_base_of<std::exception, std::bad_variant_access>::value,
                 "");
   static_assert(noexcept(std::bad_variant_access{}), "must be noexcept");
   static_assert(noexcept(std::bad_variant_access{}.what()), "must be noexcept");
   std::bad_variant_access ex;
   assert(ex.what());
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.general/nothing_to_do.pass.cpp b/test/std/utilities/variant/variant.general/nothing_to_do.pass.cpp
index 8fb3817db..8002e5576 100644
--- a/test/std/utilities/variant/variant.general/nothing_to_do.pass.cpp
+++ b/test/std/utilities/variant/variant.general/nothing_to_do.pass.cpp
@@ -1,11 +1,12 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main() {}
+int main(int, char**) {
+  return 0;
+}
diff --git a/test/std/utilities/variant/variant.get/get_if_index.pass.cpp b/test/std/utilities/variant/variant.get/get_if_index.pass.cpp
index 94cc08031..5210c5f9d 100644
--- a/test/std/utilities/variant/variant.get/get_if_index.pass.cpp
+++ b/test/std/utilities/variant/variant.get/get_if_index.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -126,7 +125,9 @@ void test_get_if() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_const_get_if();
   test_get_if();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.get/get_if_type.pass.cpp b/test/std/utilities/variant/variant.get/get_if_type.pass.cpp
index a8cc664ef..e7c9671f9 100644
--- a/test/std/utilities/variant/variant.get/get_if_type.pass.cpp
+++ b/test/std/utilities/variant/variant.get/get_if_type.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -124,7 +123,9 @@ void test_get_if() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_const_get_if();
   test_get_if();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.get/get_index.pass.cpp b/test/std/utilities/variant/variant.get/get_index.pass.cpp
index dd76fa6c7..4b04929a6 100644
--- a/test/std/utilities/variant/variant.get/get_index.pass.cpp
+++ b/test/std/utilities/variant/variant.get/get_index.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -286,10 +279,12 @@ void test_throws_for_all_value_categories() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_const_lvalue_get();
   test_lvalue_get();
   test_rvalue_get();
   test_const_rvalue_get();
   test_throws_for_all_value_categories();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.get/get_type.pass.cpp b/test/std/utilities/variant/variant.get/get_type.pass.cpp
index 7b4a67048..316213ed2 100644
--- a/test/std/utilities/variant/variant.get/get_type.pass.cpp
+++ b/test/std/utilities/variant/variant.get/get_type.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -286,10 +279,12 @@ void test_throws_for_all_value_categories() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_const_lvalue_get();
   test_lvalue_get();
   test_rvalue_get();
   test_const_rvalue_get();
   test_throws_for_all_value_categories();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.get/holds_alternative.pass.cpp b/test/std/utilities/variant/variant.get/holds_alternative.pass.cpp
index 103b04981..b37462069 100644
--- a/test/std/utilities/variant/variant.get/holds_alternative.pass.cpp
+++ b/test/std/utilities/variant/variant.get/holds_alternative.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,7 +17,7 @@
 #include "test_macros.h"
 #include <variant>
 
-int main() {
+int main(int, char**) {
   {
     using V = std::variant<int>;
     constexpr V v;
@@ -35,4 +34,6 @@ int main() {
     const V v;
     ASSERT_NOEXCEPT(std::holds_alternative<int>(v));
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.hash/enabled_hash.pass.cpp b/test/std/utilities/variant/variant.hash/enabled_hash.pass.cpp
index 826dcbae6..7e9ffbfa0 100644
--- a/test/std/utilities/variant/variant.hash/enabled_hash.pass.cpp
+++ b/test/std/utilities/variant/variant.hash/enabled_hash.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -18,6 +17,8 @@
 
 #include "poisoned_hash_helper.hpp"
 
-int main() {
+int main(int, char**) {
   test_library_hash_specializations_available();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.hash/hash.pass.cpp b/test/std/utilities/variant/variant.hash/hash.pass.cpp
index 2ad2184f4..edda8d21a 100644
--- a/test/std/utilities/variant/variant.hash/hash.pass.cpp
+++ b/test/std/utilities/variant/variant.hash/hash.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -151,9 +150,11 @@ void test_hash_variant_enabled() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_hash_variant();
   test_hash_variant_duplicate_elements();
   test_hash_monostate();
   test_hash_variant_enabled();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.helpers/variant_alternative.fail.cpp b/test/std/utilities/variant/variant.helpers/variant_alternative.fail.cpp
index 31521dae2..48d5e14e2 100644
--- a/test/std/utilities/variant/variant.helpers/variant_alternative.fail.cpp
+++ b/test/std/utilities/variant/variant.helpers/variant_alternative.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,9 @@
 #include <type_traits>
 #include <variant>
 
-int main() {
+int main(int, char**) {
     using V = std::variant<int, void *, const void *, long double>;
     std::variant_alternative<4, V>::type foo;  // expected-error@variant:* {{Index out of bounds in std::variant_alternative<>}}
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp b/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp
index 84689a050..7db07b6b0 100644
--- a/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp
+++ b/test/std/utilities/variant/variant.helpers/variant_alternative.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -56,7 +55,7 @@ template <class V, size_t I, class E> void test() {
                 "");
 }
 
-int main() {
+int main(int, char**) {
   {
     using V = std::variant<int, void *, const void *, long double>;
     test<V, 0, int>();
@@ -74,4 +73,6 @@ int main() {
     test<V, 4, long double>();
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp b/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp
index 2085fa56e..fb027fb63 100644
--- a/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp
+++ b/test/std/utilities/variant/variant.helpers/variant_size.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -37,8 +36,10 @@ template <class V, size_t E> void test() {
                 "");
 };
 
-int main() {
+int main(int, char**) {
   test<std::variant<>, 0>();
   test<std::variant<void *>, 1>();
   test<std::variant<long, long, void *, double>, 4>();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.monostate.relops/relops.pass.cpp b/test/std/utilities/variant/variant.monostate.relops/relops.pass.cpp
index 49abba295..255f6d034 100644
--- a/test/std/utilities/variant/variant.monostate.relops/relops.pass.cpp
+++ b/test/std/utilities/variant/variant.monostate.relops/relops.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,7 +23,7 @@
 #include <type_traits>
 #include <variant>
 
-int main() {
+int main(int, char**) {
   using M = std::monostate;
   constexpr M m1{};
   constexpr M m2{};
@@ -52,4 +51,6 @@ int main() {
     static_assert((m1 != m2) == false, "");
     ASSERT_NOEXCEPT(m1 != m2);
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.monostate/monostate.pass.cpp b/test/std/utilities/variant/variant.monostate/monostate.pass.cpp
index 76cddf900..1ba75a779 100644
--- a/test/std/utilities/variant/variant.monostate/monostate.pass.cpp
+++ b/test/std/utilities/variant/variant.monostate/monostate.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -17,7 +16,7 @@
 #include <type_traits>
 #include <variant>
 
-int main() {
+int main(int, char**) {
   using M = std::monostate;
   static_assert(std::is_trivially_default_constructible<M>::value, "");
   static_assert(std::is_trivially_copy_constructible<M>::value, "");
@@ -25,4 +24,6 @@ int main() {
   static_assert(std::is_trivially_destructible<M>::value, "");
   constexpr M m{};
   ((void)m);
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.relops/relops.pass.cpp b/test/std/utilities/variant/variant.relops/relops.pass.cpp
index 41a953552..ed32215ff 100644
--- a/test/std/utilities/variant/variant.relops/relops.pass.cpp
+++ b/test/std/utilities/variant/variant.relops/relops.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -270,7 +269,9 @@ void test_relational() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_equality();
   test_relational();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.relops/relops_bool_conv.fail.cpp b/test/std/utilities/variant/variant.relops/relops_bool_conv.fail.cpp
index ab68bc420..e46893465 100644
--- a/test/std/utilities/variant/variant.relops/relops_bool_conv.fail.cpp
+++ b/test/std/utilities/variant/variant.relops/relops_bool_conv.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -73,7 +72,7 @@ inline constexpr MyBoolExplicit operator>=(const ComparesToMyBoolExplicit& LHS,
 }
 
 
-int main() {
+int main(int, char**) {
   using V = std::variant<int, ComparesToMyBoolExplicit>;
   V v1(42);
   V v2(101);
@@ -85,4 +84,6 @@ int main() {
   (void)(v1 <= v2); // expected-note {{here}}
   (void)(v1 > v2); // expected-note {{here}}
   (void)(v1 >= v2); // expected-note {{here}}
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.synopsis/variant_npos.pass.cpp b/test/std/utilities/variant/variant.synopsis/variant_npos.pass.cpp
index 4d7c8563c..310b6980c 100644
--- a/test/std/utilities/variant/variant.synopsis/variant_npos.pass.cpp
+++ b/test/std/utilities/variant/variant.synopsis/variant_npos.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,6 +15,8 @@
 
 #include <variant>
 
-int main() {
+int main(int, char**) {
   static_assert(std::variant_npos == static_cast<std::size_t>(-1), "");
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp b/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
index 6c8a2b86a..02498b1ac 100644
--- a/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.assign/T.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -255,10 +248,12 @@ void test_T_assignment_performs_assignment() {
 #endif // TEST_HAS_NO_EXCEPTIONS
 }
 
-int main() {
+int main(int, char**) {
   test_T_assignment_basic();
   test_T_assignment_performs_construction();
   test_T_assignment_performs_assignment();
   test_T_assignment_noexcept();
   test_T_assignment_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp b/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
index 775ecffea..820d81e71 100644
--- a/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.assign/copy.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,19 +13,13 @@
 // XFAIL: clang-3.5, clang-3.6, clang-3.7, clang-3.8
 // XFAIL: apple-clang-6, apple-clang-7, apple-clang-8.0
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
 // template <class ...Types> class variant;
 
-// variant& operator=(variant const&);
+// variant& operator=(variant const&); // constexpr in C++20
 
 #include <cassert>
 #include <string>
@@ -240,7 +233,8 @@ void test_copy_assignment_sfinae() {
     static_assert(!std::is_copy_assignable<V>::value, "");
   }
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality (see P0602R4).
+#if TEST_STD_VER > 17
   {
     using V = std::variant<int, long>;
     static_assert(std::is_trivially_copy_assignable<V>::value, "");
@@ -262,6 +256,7 @@ void test_copy_assignment_sfinae() {
     using V = std::variant<int, CopyOnly>;
     static_assert(std::is_trivially_copy_assignable<V>::value, "");
   }
+#endif // > C++17
 }
 
 void test_copy_assignment_empty_empty() {
@@ -384,7 +379,8 @@ void test_copy_assignment_same_index() {
   }
 #endif // TEST_HAS_NO_EXCEPTIONS
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   {
     struct {
       constexpr Result<int> operator()() const {
@@ -441,6 +437,7 @@ void test_copy_assignment_same_index() {
     static_assert(result.index == 1, "");
     static_assert(result.value == 42, "");
   }
+#endif // > C++17
 }
 
 void test_copy_assignment_different_index() {
@@ -530,7 +527,8 @@ void test_copy_assignment_different_index() {
   }
 #endif // TEST_HAS_NO_EXCEPTIONS
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   {
     struct {
       constexpr Result<long> operator()() const {
@@ -559,10 +557,11 @@ void test_copy_assignment_different_index() {
     static_assert(result.index == 1, "");
     static_assert(result.value == 42, "");
   }
+#endif // > C++17
 }
 
 template <size_t NewIdx, class ValueType>
-constexpr bool test_constexpr_assign_extension_imp(
+constexpr bool test_constexpr_assign_imp(
     std::variant<long, void*, int>&& v, ValueType&& new_value)
 {
   const std::variant<long, void*, int> cp(
@@ -572,18 +571,20 @@ constexpr bool test_constexpr_assign_extension_imp(
         std::get<NewIdx>(v) == std::get<NewIdx>(cp);
 }
 
-void test_constexpr_copy_assignment_extension() {
-  // The following tests are for not-yet-standardized behavior (P0602):
+void test_constexpr_copy_assignment() {
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   using V = std::variant<long, void*, int>;
   static_assert(std::is_trivially_copyable<V>::value, "");
   static_assert(std::is_trivially_copy_assignable<V>::value, "");
-  static_assert(test_constexpr_assign_extension_imp<0>(V(42l), 101l), "");
-  static_assert(test_constexpr_assign_extension_imp<0>(V(nullptr), 101l), "");
-  static_assert(test_constexpr_assign_extension_imp<1>(V(42l), nullptr), "");
-  static_assert(test_constexpr_assign_extension_imp<2>(V(42l), 101), "");
+  static_assert(test_constexpr_assign_imp<0>(V(42l), 101l), "");
+  static_assert(test_constexpr_assign_imp<0>(V(nullptr), 101l), "");
+  static_assert(test_constexpr_assign_imp<1>(V(42l), nullptr), "");
+  static_assert(test_constexpr_assign_imp<2>(V(42l), 101), "");
+#endif // > C++17
 }
 
-int main() {
+int main(int, char**) {
   test_copy_assignment_empty_empty();
   test_copy_assignment_non_empty_empty();
   test_copy_assignment_empty_non_empty();
@@ -591,5 +592,7 @@ int main() {
   test_copy_assignment_different_index();
   test_copy_assignment_sfinae();
   test_copy_assignment_not_noexcept();
-  test_constexpr_copy_assignment_extension();
+  test_constexpr_copy_assignment();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp b/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
index 7b2dedd0d..990e10c0f 100644
--- a/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,20 +13,14 @@
 // XFAIL: clang-3.5, clang-3.6, clang-3.7, clang-3.8
 // XFAIL: apple-clang-6, apple-clang-7, apple-clang-8.0
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 
 // <variant>
 
 // template <class ...Types> class variant;
 
-// variant& operator=(variant&&) noexcept(see below);
+// variant& operator=(variant&&) noexcept(see below); // constexpr in C++20
 
 #include <cassert>
 #include <string>
@@ -206,7 +199,8 @@ void test_move_assignment_sfinae() {
     static_assert(!std::is_move_assignable<V>::value, "");
   }
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality (see P0602R4).
+#if TEST_STD_VER > 17
   {
     using V = std::variant<int, long>;
     static_assert(std::is_trivially_move_assignable<V>::value, "");
@@ -232,6 +226,7 @@ void test_move_assignment_sfinae() {
     using V = std::variant<int, CopyOnly>;
     static_assert(std::is_trivially_move_assignable<V>::value, "");
   }
+#endif // > C++17
 }
 
 void test_move_assignment_empty_empty() {
@@ -353,7 +348,8 @@ void test_move_assignment_same_index() {
   }
 #endif // TEST_HAS_NO_EXCEPTIONS
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   {
     struct {
       constexpr Result<int> operator()() const {
@@ -396,6 +392,7 @@ void test_move_assignment_same_index() {
     static_assert(result.index == 1, "");
     static_assert(result.value == 42, "");
   }
+#endif // > C++17
 }
 
 void test_move_assignment_different_index() {
@@ -445,7 +442,8 @@ void test_move_assignment_different_index() {
   }
 #endif // TEST_HAS_NO_EXCEPTIONS
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   {
     struct {
       constexpr Result<long> operator()() const {
@@ -474,10 +472,11 @@ void test_move_assignment_different_index() {
     static_assert(result.index == 1, "");
     static_assert(result.value == 42, "");
   }
+#endif // > C++17
 }
 
 template <size_t NewIdx, class ValueType>
-constexpr bool test_constexpr_assign_extension_imp(
+constexpr bool test_constexpr_assign_imp(
     std::variant<long, void*, int>&& v, ValueType&& new_value)
 {
   std::variant<long, void*, int> v2(
@@ -488,18 +487,20 @@ constexpr bool test_constexpr_assign_extension_imp(
         std::get<NewIdx>(v) == std::get<NewIdx>(cp);
 }
 
-void test_constexpr_move_assignment_extension() {
-  // The following tests are for not-yet-standardized behavior (P0602):
+void test_constexpr_move_assignment() {
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   using V = std::variant<long, void*, int>;
   static_assert(std::is_trivially_copyable<V>::value, "");
   static_assert(std::is_trivially_move_assignable<V>::value, "");
-  static_assert(test_constexpr_assign_extension_imp<0>(V(42l), 101l), "");
-  static_assert(test_constexpr_assign_extension_imp<0>(V(nullptr), 101l), "");
-  static_assert(test_constexpr_assign_extension_imp<1>(V(42l), nullptr), "");
-  static_assert(test_constexpr_assign_extension_imp<2>(V(42l), 101), "");
+  static_assert(test_constexpr_assign_imp<0>(V(42l), 101l), "");
+  static_assert(test_constexpr_assign_imp<0>(V(nullptr), 101l), "");
+  static_assert(test_constexpr_assign_imp<1>(V(42l), nullptr), "");
+  static_assert(test_constexpr_assign_imp<2>(V(42l), 101), "");
+#endif // > C++17
 }
 
-int main() {
+int main(int, char**) {
   test_move_assignment_empty_empty();
   test_move_assignment_non_empty_empty();
   test_move_assignment_empty_non_empty();
@@ -507,5 +508,7 @@ int main() {
   test_move_assignment_different_index();
   test_move_assignment_sfinae();
   test_move_assignment_noexcept();
-  test_constexpr_move_assignment_extension();
+  test_constexpr_move_assignment();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
index d414c3503..73bd2c628 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/T.pass.cpp
@@ -1,25 +1,17 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
-
 // template <class ...Types> class variant;
 
 // template <class T> constexpr variant(T&&) noexcept(see below);
@@ -127,8 +119,10 @@ void test_T_ctor_basic() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_T_ctor_basic();
   test_T_ctor_noexcept();
   test_T_ctor_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
index 9e1e77725..4cd210d3d 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/copy.pass.cpp
@@ -1,28 +1,21 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
 // template <class ...Types> class variant;
 
-// variant(variant const&);
+// variant(variant const&); // constexpr in C++20
 
 #include <cassert>
 #include <type_traits>
@@ -126,7 +119,8 @@ void test_copy_ctor_sfinae() {
     static_assert(!std::is_copy_constructible<V>::value, "");
   }
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality (see P0602R4).
+#if TEST_STD_VER > 17
   {
     using V = std::variant<int, long>;
     static_assert(std::is_trivially_copy_constructible<V>::value, "");
@@ -144,6 +138,7 @@ void test_copy_ctor_sfinae() {
     using V = std::variant<int, TCopyNTMove>;
     static_assert(std::is_trivially_copy_constructible<V>::value, "");
   }
+#endif // > C++17
 }
 
 void test_copy_ctor_basic() {
@@ -174,7 +169,8 @@ void test_copy_ctor_basic() {
     assert(std::get<1>(v2).value == 42);
   }
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   {
     constexpr std::variant<int> v(std::in_place_index<0>, 42);
     static_assert(v.index() == 0, "");
@@ -217,6 +213,7 @@ void test_copy_ctor_basic() {
     static_assert(v2.index() == 1, "");
     static_assert(std::get<1>(v2).value == 42, "");
   }
+#endif // > C++17
 }
 
 void test_copy_ctor_valueless_by_exception() {
@@ -231,17 +228,16 @@ void test_copy_ctor_valueless_by_exception() {
 }
 
 template <size_t Idx>
-constexpr bool test_constexpr_copy_ctor_extension_imp(
-    std::variant<long, void*, const int> const& v)
-{
+constexpr bool test_constexpr_copy_ctor_imp(std::variant<long, void*, const int> const& v) {
   auto v2 = v;
   return v2.index() == v.index() &&
          v2.index() == Idx &&
          std::get<Idx>(v2) == std::get<Idx>(v);
 }
 
-void test_constexpr_copy_ctor_extension() {
-  // NOTE: This test is for not yet standardized behavior. (P0602)
+void test_constexpr_copy_ctor() {
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   using V = std::variant<long, void*, const int>;
 #ifdef TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE
   static_assert(std::is_trivially_destructible<V>::value, "");
@@ -252,16 +248,17 @@ void test_constexpr_copy_ctor_extension() {
 #else // TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE
   static_assert(std::is_trivially_copyable<V>::value, "");
 #endif // TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE
-  static_assert(test_constexpr_copy_ctor_extension_imp<0>(V(42l)), "");
-  static_assert(test_constexpr_copy_ctor_extension_imp<1>(V(nullptr)), "");
-  static_assert(test_constexpr_copy_ctor_extension_imp<2>(V(101)), "");
+  static_assert(test_constexpr_copy_ctor_imp<0>(V(42l)), "");
+  static_assert(test_constexpr_copy_ctor_imp<1>(V(nullptr)), "");
+  static_assert(test_constexpr_copy_ctor_imp<2>(V(101)), "");
+#endif // > C++17
 }
 
-int main() {
+int main(int, char**) {
   test_copy_ctor_basic();
   test_copy_ctor_valueless_by_exception();
   test_copy_ctor_sfinae();
-  test_constexpr_copy_ctor_extension();
+  test_constexpr_copy_ctor();
 #if 0
 // disable this for the moment; it fails on older compilers.
 //  Need to figure out which compilers will support it.
@@ -271,4 +268,6 @@ int main() {
   (void) v2;
 }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
index e4278f0e0..579ae4d9f 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/default.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -123,9 +116,11 @@ void test_default_ctor_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_default_ctor_basic();
   test_default_ctor_sfinae();
   test_default_ctor_noexcept();
   test_default_ctor_throws();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
index 0e1ba7bba..ac736fb3a 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_args.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -105,7 +98,9 @@ void test_ctor_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_ctor_basic();
   test_ctor_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
index 7dcd2541b..179b66353 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_index_init_list_args.pass.cpp
@@ -1,25 +1,17 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
-
 // template <class ...Types> class variant;
 
 // template <size_t I, class Up, class ...Args>
@@ -111,7 +103,9 @@ void test_ctor_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_ctor_basic();
   test_ctor_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
index c798efbaa..430ddca3c 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_args.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -115,7 +108,9 @@ void test_ctor_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_ctor_basic();
   test_ctor_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
index 7d632af9a..46dab74e8 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/in_place_type_init_list_args.pass.cpp
@@ -1,25 +1,17 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
-
 // template <class ...Types> class variant;
 
 // template <class Tp, class Up, class ...Args>
@@ -112,7 +104,9 @@ void test_ctor_basic() {
   }
 }
 
-int main() {
+int main(int, char**) {
   test_ctor_basic();
   test_ctor_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp b/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
index e6cdb0e96..d06b638e6 100644
--- a/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.ctor/move.pass.cpp
@@ -1,28 +1,21 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
 // template <class ...Types> class variant;
 
-// variant(variant&&) noexcept(see below);
+// variant(variant&&) noexcept(see below); // constexpr in C++20
 
 #include <cassert>
 #include <string>
@@ -147,7 +140,8 @@ void test_move_ctor_sfinae() {
     static_assert(!std::is_move_constructible<V>::value, "");
   }
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality (see P0602R4).
+#if TEST_STD_VER > 17
   {
     using V = std::variant<int, long>;
     static_assert(std::is_trivially_move_constructible<V>::value, "");
@@ -165,6 +159,7 @@ void test_move_ctor_sfinae() {
     using V = std::variant<int, TMoveNTCopy>;
     static_assert(std::is_trivially_move_constructible<V>::value, "");
   }
+#endif // > C++17
 }
 
 template <typename T>
@@ -214,7 +209,8 @@ void test_move_ctor_basic() {
     assert(std::get<1>(v2).value == 42);
   }
 
-  // The following tests are for not-yet-standardized behavior (P0602):
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   {
     struct {
       constexpr Result<int> operator()() const {
@@ -287,6 +283,7 @@ void test_move_ctor_basic() {
     static_assert(result.index == 1, "");
     static_assert(result.value.value == 42, "");
   }
+#endif // > C++17
 }
 
 void test_move_ctor_valueless_by_exception() {
@@ -300,9 +297,7 @@ void test_move_ctor_valueless_by_exception() {
 }
 
 template <size_t Idx>
-constexpr bool test_constexpr_ctor_extension_imp(
-    std::variant<long, void*, const int> const& v)
-{
+constexpr bool test_constexpr_ctor_imp(std::variant<long, void*, const int> const& v) {
   auto copy = v;
   auto v2 = std::move(copy);
   return v2.index() == v.index() &&
@@ -310,8 +305,9 @@ constexpr bool test_constexpr_ctor_extension_imp(
         std::get<Idx>(v2) == std::get<Idx>(v);
 }
 
-void test_constexpr_move_ctor_extension() {
-  // NOTE: This test is for not yet standardized behavior. (P0602)
+void test_constexpr_move_ctor() {
+  // Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
+#if TEST_STD_VER > 17
   using V = std::variant<long, void*, const int>;
 #ifdef TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE
   static_assert(std::is_trivially_destructible<V>::value, "");
@@ -323,15 +319,18 @@ void test_constexpr_move_ctor_extension() {
   static_assert(std::is_trivially_copyable<V>::value, "");
 #endif // TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE
   static_assert(std::is_trivially_move_constructible<V>::value, "");
-  static_assert(test_constexpr_ctor_extension_imp<0>(V(42l)), "");
-  static_assert(test_constexpr_ctor_extension_imp<1>(V(nullptr)), "");
-  static_assert(test_constexpr_ctor_extension_imp<2>(V(101)), "");
+  static_assert(test_constexpr_ctor_imp<0>(V(42l)), "");
+  static_assert(test_constexpr_ctor_imp<1>(V(nullptr)), "");
+  static_assert(test_constexpr_ctor_imp<2>(V(101)), "");
+#endif // > C++17
 }
 
-int main() {
+int main(int, char**) {
   test_move_ctor_basic();
   test_move_ctor_valueless_by_exception();
   test_move_noexcept();
   test_move_ctor_sfinae();
-  test_constexpr_move_ctor_extension();
+  test_constexpr_move_ctor();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.dtor/dtor.pass.cpp b/test/std/utilities/variant/variant.variant/variant.dtor/dtor.pass.cpp
index 7299394ee..b26ab0c29 100644
--- a/test/std/utilities/variant/variant.variant/variant.dtor/dtor.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.dtor/dtor.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -45,7 +44,7 @@ struct TDtor {
 static_assert(!std::is_trivially_copy_constructible<TDtor>::value, "");
 static_assert(std::is_trivially_destructible<TDtor>::value, "");
 
-int main() {
+int main(int, char**) {
   {
     using V = std::variant<int, long, TDtor>;
     static_assert(std::is_trivially_destructible<V>::value, "");
@@ -72,4 +71,6 @@ int main() {
     assert(NonTDtor::count == 0);
     assert(NonTDtor1::count == 1);
   }
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
index d281927c7..95f16ac2d 100644
--- a/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_args.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -160,7 +153,9 @@ void test_basic() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_basic();
   test_emplace_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
index 939e8f39d..aee3c3fa1 100644
--- a/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.mod/emplace_index_init_list_args.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -93,7 +86,9 @@ void test_basic() {
   assert(&ref3 == &std::get<1>(v));
 }
 
-int main() {
+int main(int, char**) {
   test_basic();
   test_emplace_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
index 4fed14167..929806a09 100644
--- a/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_args.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -160,7 +153,9 @@ void test_basic() {
 #endif
 }
 
-int main() {
+int main(int, char**) {
   test_basic();
   test_emplace_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp b/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
index f03e95644..9cb9674f4 100644
--- a/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.mod/emplace_type_init_list_args.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -93,7 +86,9 @@ void test_basic() {
   assert(&ref3 == &std::get<InitList>(v));
 }
 
-int main() {
+int main(int, char**) {
   test_basic();
   test_emplace_sfinae();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.status/index.pass.cpp b/test/std/utilities/variant/variant.variant/variant.status/index.pass.cpp
index 6d78de3a4..6d463ad27 100644
--- a/test/std/utilities/variant/variant.variant/variant.status/index.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.status/index.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "variant_test_helpers.hpp"
 
 
-int main() {
+int main(int, char**) {
   {
     using V = std::variant<int, long>;
     constexpr V v;
@@ -58,4 +57,6 @@ int main() {
     assert(v.index() == std::variant_npos);
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.status/valueless_by_exception.pass.cpp b/test/std/utilities/variant/variant.variant/variant.status/valueless_by_exception.pass.cpp
index 9ccdc2221..2cb730cb0 100644
--- a/test/std/utilities/variant/variant.variant/variant.status/valueless_by_exception.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.status/valueless_by_exception.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,7 +25,7 @@
 #include "variant_test_helpers.hpp"
 
 
-int main() {
+int main(int, char**) {
   {
     using V = std::variant<int, long>;
     constexpr V v;
@@ -51,4 +50,6 @@ int main() {
     assert(v.valueless_by_exception());
   }
 #endif
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp b/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
index ec85ce767..8443f1e8e 100644
--- a/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
+++ b/test/std/utilities/variant/variant.variant/variant.swap/swap.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 
@@ -590,10 +583,12 @@ void test_swap_noexcept() {
 template class std::variant<int, NotSwappable>;
 #endif
 
-int main() {
+int main(int, char**) {
   test_swap_valueless_by_exception();
   test_swap_same_alternative();
   test_swap_different_alternatives();
   test_swap_sfinae();
   test_swap_noexcept();
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant_array.fail.cpp b/test/std/utilities/variant/variant.variant/variant_array.fail.cpp
index 11ee332e2..ce79e9c42 100644
--- a/test/std/utilities/variant/variant.variant/variant_array.fail.cpp
+++ b/test/std/utilities/variant/variant.variant/variant_array.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,10 +23,12 @@
 #include "variant_test_helpers.hpp"
 #include "test_convertible.hpp"
 
-int main()
+int main(int, char**)
 {
     // expected-error@variant:* 3 {{static_assert failed}}
     std::variant<int, int[]> v; // expected-note {{requested here}}
     std::variant<int, int[42]> v2; // expected-note {{requested here}}
     std::variant<int, int[][42]> v3; // expected-note {{requested here}}
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant_empty.fail.cpp b/test/std/utilities/variant/variant.variant/variant_empty.fail.cpp
index 2d8cc0b3d..3b93cb0ab 100644
--- a/test/std/utilities/variant/variant.variant/variant_empty.fail.cpp
+++ b/test/std/utilities/variant/variant.variant/variant_empty.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,8 +18,10 @@
 #include "test_macros.h"
 #include "variant_test_helpers.hpp"
 
-int main()
+int main(int, char**)
 {
     // expected-error@variant:* 1 {{static_assert failed}}
     std::variant<> v; // expected-note {{requested here}}
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant_reference.fail.cpp b/test/std/utilities/variant/variant.variant/variant_reference.fail.cpp
index bda27f0e5..7c2c46690 100644
--- a/test/std/utilities/variant/variant.variant/variant_reference.fail.cpp
+++ b/test/std/utilities/variant/variant.variant/variant_reference.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,10 +18,12 @@
 #include "test_macros.h"
 #include "variant_test_helpers.hpp"
 
-int main()
+int main(int, char**)
 {
     // expected-error@variant:* 3 {{static_assert failed}}
     std::variant<int, int&> v; // expected-note {{requested here}}
     std::variant<int, const int &> v2; // expected-note {{requested here}}
     std::variant<int, int&&> v3; // expected-note {{requested here}}
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.variant/variant_void.fail.cpp b/test/std/utilities/variant/variant.variant/variant_void.fail.cpp
index 3d0da5620..27e9c399f 100644
--- a/test/std/utilities/variant/variant.variant/variant_void.fail.cpp
+++ b/test/std/utilities/variant/variant.variant/variant_void.fail.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -24,10 +23,12 @@
 #include "variant_test_helpers.hpp"
 #include "test_convertible.hpp"
 
-int main()
+int main(int, char**)
 {
     // expected-error@variant:* 3 {{static_assert failed}}
     std::variant<int, void> v; // expected-note {{requested here}}
     std::variant<int, const void> v2; // expected-note {{requested here}}
     std::variant<const volatile void, int> v3; // expected-note {{requested here}}
+
+  return 0;
 }
diff --git a/test/std/utilities/variant/variant.visit/visit.pass.cpp b/test/std/utilities/variant/variant.visit/visit.pass.cpp
index 693369abb..11e26d097 100644
--- a/test/std/utilities/variant/variant.visit/visit.pass.cpp
+++ b/test/std/utilities/variant/variant.visit/visit.pass.cpp
@@ -1,22 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 
-// XFAIL: availability=macosx10.13
-// XFAIL: availability=macosx10.12
-// XFAIL: availability=macosx10.11
-// XFAIL: availability=macosx10.10
-// XFAIL: availability=macosx10.9
-// XFAIL: availability=macosx10.8
-// XFAIL: availability=macosx10.7
+// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
 
 // <variant>
 // template <class Visitor, class... Variants>
@@ -311,10 +304,12 @@ void test_caller_accepts_nonconst() {
   std::visit(Visitor{}, v);
 }
 
-int main() {
+int main(int, char**) {
   test_call_operator_forwarding();
   test_argument_forwarding();
   test_constexpr();
   test_exceptions();
   test_caller_accepts_nonconst();
+
+  return 0;
 }
diff --git a/test/support/Counter.h b/test/support/Counter.h
index 63ed60801..8dbdaeb36 100644
--- a/test/support/Counter.h
+++ b/test/support/Counter.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/DefaultOnly.h b/test/support/DefaultOnly.h
index a3d4303f8..2e9e7029c 100644
--- a/test/support/DefaultOnly.h
+++ b/test/support/DefaultOnly.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/MoveOnly.h b/test/support/MoveOnly.h
index 2eba8e742..5611ebbdd 100644
--- a/test/support/MoveOnly.h
+++ b/test/support/MoveOnly.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/allocators.h b/test/support/allocators.h
index 00e9a0c13..eae51909e 100644
--- a/test/support/allocators.h
+++ b/test/support/allocators.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/any_helpers.h b/test/support/any_helpers.h
index ec8654d19..eb9a4c149 100644
--- a/test/support/any_helpers.h
+++ b/test/support/any_helpers.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef ANY_HELPERS_H
diff --git a/test/support/asan_testing.h b/test/support/asan_testing.h
index 678f12a91..6171d0bee 100644
--- a/test/support/asan_testing.h
+++ b/test/support/asan_testing.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/charconv_test_helpers.h b/test/support/charconv_test_helpers.h
index 1560fa79a..dc704a925 100644
--- a/test/support/charconv_test_helpers.h
+++ b/test/support/charconv_test_helpers.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/cmpxchg_loop.h b/test/support/cmpxchg_loop.h
index 5bec51b63..50bd00a30 100644
--- a/test/support/cmpxchg_loop.h
+++ b/test/support/cmpxchg_loop.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/constexpr_char_traits.hpp b/test/support/constexpr_char_traits.hpp
index 7508567ca..df43d8f7c 100644
--- a/test/support/constexpr_char_traits.hpp
+++ b/test/support/constexpr_char_traits.hpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===-------------------- constexpr_char_traits ---------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/container_test_types.h b/test/support/container_test_types.h
index 1c4625b9f..2668aa889 100644
--- a/test/support/container_test_types.h
+++ b/test/support/container_test_types.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_CONTAINER_TEST_TYPES_H
diff --git a/test/support/controlled_allocators.hpp b/test/support/controlled_allocators.hpp
index f0d615c35..63a4c402b 100644
--- a/test/support/controlled_allocators.hpp
+++ b/test/support/controlled_allocators.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/coroutine_types.h b/test/support/coroutine_types.h
index f592bedca..e5d40b1fc 100644
--- a/test/support/coroutine_types.h
+++ b/test/support/coroutine_types.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/count_new.hpp b/test/support/count_new.hpp
index e3111e7a5..5601c0054 100644
--- a/test/support/count_new.hpp
+++ b/test/support/count_new.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/counting_predicates.hpp b/test/support/counting_predicates.hpp
index a0b3ca518..1868d30b4 100644
--- a/test/support/counting_predicates.hpp
+++ b/test/support/counting_predicates.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/debug_mode_helper.h b/test/support/debug_mode_helper.h
index 350deb083..611b4dbb4 100644
--- a/test/support/debug_mode_helper.h
+++ b/test/support/debug_mode_helper.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/deleter_types.h b/test/support/deleter_types.h
index ec7016801..1c99feaa6 100644
--- a/test/support/deleter_types.h
+++ b/test/support/deleter_types.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/demangle.h b/test/support/demangle.h
index 98d93c85a..f8e90a19f 100644
--- a/test/support/demangle.h
+++ b/test/support/demangle.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_DEMANGLE_H
diff --git a/test/support/disable_missing_braces_warning.h b/test/support/disable_missing_braces_warning.h
index ac8b40728..9e115f8bf 100644
--- a/test/support/disable_missing_braces_warning.h
+++ b/test/support/disable_missing_braces_warning.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_DISABLE_MISSING_BRACES_WARNING_H
diff --git a/test/support/experimental_any_helpers.h b/test/support/experimental_any_helpers.h
index f7bc0e33e..eeffd8c98 100644
--- a/test/support/experimental_any_helpers.h
+++ b/test/support/experimental_any_helpers.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef EXPERIMENTAL_ANY_HELPERS_H
diff --git a/test/support/external_threads.cpp b/test/support/external_threads.cpp
index 019ab473a..3ffce1a63 100644
--- a/test/support/external_threads.cpp
+++ b/test/support/external_threads.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #define _LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL
diff --git a/test/support/filesystem_test_helper.hpp b/test/support/filesystem_test_helper.hpp
index f02792870..467abd5fc 100644
--- a/test/support/filesystem_test_helper.hpp
+++ b/test/support/filesystem_test_helper.hpp
@@ -2,6 +2,9 @@
 #define FILESYSTEM_TEST_HELPER_HPP
 
 #include "filesystem_include.hpp"
+
+#include <unistd.h> // for ftruncate
+
 #include <cassert>
 #include <cstdio> // for printf
 #include <string>
@@ -147,13 +150,46 @@ struct scoped_test_env
         return raw;
     }
 
-    std::string create_file(std::string filename, std::size_t size = 0) {
+    // Purposefully using a size potentially larger than off_t here so we can
+    // test the behavior of libc++fs when it is built with _FILE_OFFSET_BITS=64
+    // but the caller is not (std::filesystem also uses uintmax_t rather than
+    // off_t). On a 32-bit system this allows us to create a file larger than
+    // 2GB.
+    std::string create_file(std::string filename, uintmax_t size = 0) {
+#if defined(__LP64__)
+        auto large_file_fopen = fopen;
+        auto large_file_ftruncate = ftruncate;
+        using large_file_offset_t = off_t;
+#else
+        auto large_file_fopen = fopen64;
+        auto large_file_ftruncate = ftruncate64;
+        using large_file_offset_t = off64_t;
+#endif
+
         filename = sanitize_path(std::move(filename));
-        std::string out_str(size, 'a');
-        {
-            std::ofstream out(filename.c_str());
-            out << out_str;
+
+        if (size > std::numeric_limits<large_file_offset_t>::max()) {
+            fprintf(stderr, "create_file(%s, %ju) too large\n",
+                    filename.c_str(), size);
+            abort();
         }
+
+        FILE* file = large_file_fopen(filename.c_str(), "we");
+        if (file == nullptr) {
+            fprintf(stderr, "fopen %s failed: %s\n", filename.c_str(),
+                    strerror(errno));
+            abort();
+        }
+
+        if (large_file_ftruncate(
+                fileno(file), static_cast<large_file_offset_t>(size)) == -1) {
+            fprintf(stderr, "ftruncate %s %ju failed: %s\n", filename.c_str(),
+                    size, strerror(errno));
+            fclose(file);
+            abort();
+        }
+
+        fclose(file);
         return filename;
     }
 
diff --git a/test/support/hexfloat.h b/test/support/hexfloat.h
index 19008d1d5..23ad9a3f9 100644
--- a/test/support/hexfloat.h
+++ b/test/support/hexfloat.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/is_transparent.h b/test/support/is_transparent.h
index f7cdbbc14..667877526 100644
--- a/test/support/is_transparent.h
+++ b/test/support/is_transparent.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/min_allocator.h b/test/support/min_allocator.h
index a3af9e1db..100e6d14a 100644
--- a/test/support/min_allocator.h
+++ b/test/support/min_allocator.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -14,6 +13,7 @@
 #include <cstdlib>
 #include <cstddef>
 #include <cassert>
+#include <climits>
 
 #include "test_macros.h"
 
@@ -131,6 +131,59 @@ public:
     friend bool operator!=(malloc_allocator x, malloc_allocator y) {return !(x == y);}
 };
 
+template <class T>
+struct cpp03_allocator : bare_allocator<T>
+{
+    typedef T value_type;
+    typedef value_type* pointer;
+
+    static bool construct_called;
+
+    // Returned value is not used but it's not prohibited.
+    pointer construct(pointer p, const value_type& val)
+    {
+        ::new(p) value_type(val);
+        construct_called = true;
+        return p;
+    }
+
+    std::size_t max_size() const
+    {
+        return UINT_MAX / sizeof(T);
+    }
+};
+template <class T> bool cpp03_allocator<T>::construct_called = false;
+
+template <class T>
+struct cpp03_overload_allocator : bare_allocator<T>
+{
+    typedef T value_type;
+    typedef value_type* pointer;
+
+    static bool construct_called;
+
+    void construct(pointer p, const value_type& val)
+    {
+        construct(p, val, std::is_class<T>());
+    }
+    void construct(pointer p, const value_type& val, std::true_type)
+    {
+        ::new(p) value_type(val);
+        construct_called = true;
+    }
+    void construct(pointer p, const value_type& val, std::false_type)
+    {
+        ::new(p) value_type(val);
+        construct_called = true;
+    }
+
+    std::size_t max_size() const
+    {
+        return UINT_MAX / sizeof(T);
+    }
+};
+template <class T> bool cpp03_overload_allocator<T>::construct_called = false;
+
 
 #if TEST_STD_VER >= 11
 
diff --git a/test/support/msvc_stdlib_force_include.hpp b/test/support/msvc_stdlib_force_include.hpp
index f2ec35fd0..fcf64d78c 100644
--- a/test/support/msvc_stdlib_force_include.hpp
+++ b/test/support/msvc_stdlib_force_include.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -79,10 +78,14 @@ const AssertionDialogAvoider assertion_dialog_avoider{};
 
 #include <ciso646>
 
-#if _HAS_CXX17
+#if _HAS_CXX20
+    #define TEST_STD_VER 99
+#elif _HAS_CXX17
     #define TEST_STD_VER 17
-#else // _HAS_CXX17
+#else // !(_HAS_CXX20 || _HAS_CXX17)
     #define TEST_STD_VER 14
-#endif // _HAS_CXX17
+#endif
+
+#define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
 
 #endif // SUPPORT_MSVC_STDLIB_FORCE_INCLUDE_HPP
diff --git a/test/support/nasty_containers.hpp b/test/support/nasty_containers.hpp
index b52263a97..91251666b 100644
--- a/test/support/nasty_containers.hpp
+++ b/test/support/nasty_containers.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/nasty_macros.hpp b/test/support/nasty_macros.hpp
index 3c2a5e27a..30d0ec003 100644
--- a/test/support/nasty_macros.hpp
+++ b/test/support/nasty_macros.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_NASTY_MACROS_HPP
@@ -55,6 +54,7 @@
 // Test that libc++ doesn't use names reserved by WIN32 API Macros.
 // NOTE: Obviously we can only define these on non-windows platforms.
 #ifndef _WIN32
+#define __allocator NASTY_MACRO
 #define __deallocate NASTY_MACRO
 #define __out NASTY_MACRO
 #endif
diff --git a/test/support/nothing_to_do.pass.cpp b/test/support/nothing_to_do.pass.cpp
index 9125fe194..f54d71c86 100644
--- a/test/support/nothing_to_do.pass.cpp
+++ b/test/support/nothing_to_do.pass.cpp
@@ -1,14 +1,15 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-int main()
+int main(int, char**)
 {
+
+  return 0;
 }
 
diff --git a/test/support/platform_support.h b/test/support/platform_support.h
index eae79541d..19531ce08 100644
--- a/test/support/platform_support.h
+++ b/test/support/platform_support.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/poisoned_hash_helper.hpp b/test/support/poisoned_hash_helper.hpp
index 07cb72692..83687ddf6 100644
--- a/test/support/poisoned_hash_helper.hpp
+++ b/test/support/poisoned_hash_helper.hpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_POISONED_HASH_HELPER_HPP
diff --git a/test/support/private_constructor.hpp b/test/support/private_constructor.hpp
index a9fcf6897..69411a8d9 100644
--- a/test/support/private_constructor.hpp
+++ b/test/support/private_constructor.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/set_windows_crt_report_mode.h b/test/support/set_windows_crt_report_mode.h
index 5fc1698b4..206bd5ddb 100644
--- a/test/support/set_windows_crt_report_mode.h
+++ b/test/support/set_windows_crt_report_mode.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_SET_WINDOWS_CRT_REPORT_MODE_H
diff --git a/test/support/test.support/test_convertible_header.pass.cpp b/test/support/test.support/test_convertible_header.pass.cpp
index a56b84b47..f2923d50c 100644
--- a/test/support/test.support/test_convertible_header.pass.cpp
+++ b/test/support/test.support/test_convertible_header.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -63,6 +62,8 @@ struct ExplicitArgs {
 };
 static_assert(!test_convertible<ExplicitArgs, int, int, int>(), "Must not be convertible");
 
-int main() {
+int main(int, char**) {
     // Nothing to do
+
+  return 0;
 }
diff --git a/test/support/test.support/test_demangle.pass.cpp b/test/support/test.support/test_demangle.pass.cpp
index 08808c194..2f1b16be9 100644
--- a/test/support/test.support/test_demangle.pass.cpp
+++ b/test/support/test.support/test_demangle.pass.cpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #include "demangle.h"
@@ -15,7 +14,7 @@ struct MyType {};
 
 template <class T, class U> struct ArgumentListID {};
 
-int main() {
+int main(int, char**) {
   struct {
     const char* raw;
     const char* expect;
@@ -35,4 +34,6 @@ int main() {
     assert(demangle(raw) == expect);
 #endif
   }
+
+  return 0;
 }
diff --git a/test/support/test.support/test_macros_header_exceptions.fail.cpp b/test/support/test.support/test_macros_header_exceptions.fail.cpp
index ade2cd98f..b120aabc0 100644
--- a/test/support/test.support/test_macros_header_exceptions.fail.cpp
+++ b/test/support/test.support/test_macros_header_exceptions.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,7 +12,7 @@
 
 #include "test_macros.h"
 
-int main() {
+int main(int, char**) {
 #if defined(TEST_HAS_NO_EXCEPTIONS)
     try { ((void)0); } catch (...) {} // expected-error {{exceptions disabled}}
 #else
@@ -21,4 +20,6 @@ int main() {
 #error exceptions enabled
 // expected-error@-1 {{exceptions enabled}}
 #endif
+
+  return 0;
 }
diff --git a/test/support/test.support/test_macros_header_exceptions.pass.cpp b/test/support/test.support/test_macros_header_exceptions.pass.cpp
index 589e148a0..ccdf257dc 100644
--- a/test/support/test.support/test_macros_header_exceptions.pass.cpp
+++ b/test/support/test.support/test_macros_header_exceptions.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -19,6 +18,8 @@
 #error macro defined unexpectedly
 #endif
 
-int main() {
+int main(int, char**) {
     try { ((void)0); } catch (...) {}
+
+  return 0;
 }
diff --git a/test/support/test.support/test_macros_header_rtti.fail.cpp b/test/support/test.support/test_macros_header_rtti.fail.cpp
index 851a6c601..b2f3177af 100644
--- a/test/support/test.support/test_macros_header_rtti.fail.cpp
+++ b/test/support/test.support/test_macros_header_rtti.fail.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,7 +15,7 @@
 struct A { virtual ~A() {} };
 struct B : A {};
 
-int main() {
+int main(int, char**) {
 #if defined(TEST_HAS_NO_RTTI)
     A* ptr = new B;
     (void)dynamic_cast<B*>(ptr); // expected-error{{cannot use dynamic_cast}}
@@ -26,4 +25,6 @@ int main() {
 #error RTTI enabled
 // expected-error@-1{{RTTI enabled}}
 #endif
+
+  return 0;
 }
diff --git a/test/support/test.support/test_macros_header_rtti.pass.cpp b/test/support/test.support/test_macros_header_rtti.pass.cpp
index dee1a0494..e38545f9b 100644
--- a/test/support/test.support/test_macros_header_rtti.pass.cpp
+++ b/test/support/test.support/test_macros_header_rtti.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -22,8 +21,10 @@
 struct A { virtual ~A() {} };
 struct B : A {};
 
-int main() {
+int main(int, char**) {
     A* ptr = new B;
     (void)dynamic_cast<B*>(ptr);
     delete ptr;
+
+  return 0;
 }
diff --git a/test/support/test.support/test_poisoned_hash_helper.pass.cpp b/test/support/test.support/test_poisoned_hash_helper.pass.cpp
index 4dffae6db..692854b3d 100644
--- a/test/support/test.support/test_poisoned_hash_helper.pass.cpp
+++ b/test/support/test.support/test_poisoned_hash_helper.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,6 +24,8 @@ template <class T> struct has_complete_hash {
   enum { value = is_complete<std::hash<T> >() };
 };
 
-int main() {
+int main(int, char**) {
   static_assert(LibraryHashTypes::assertTrait<has_complete_hash, false>(), "");
+
+  return 0;
 }
diff --git a/test/support/test.workarounds/c1xx_broken_is_trivially_copyable.pass.cpp b/test/support/test.workarounds/c1xx_broken_is_trivially_copyable.pass.cpp
index 669f175c4..1b2fd1462 100644
--- a/test/support/test.workarounds/c1xx_broken_is_trivially_copyable.pass.cpp
+++ b/test/support/test.workarounds/c1xx_broken_is_trivially_copyable.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -26,10 +25,12 @@ struct S {
   S& operator=(S&&) = delete;
 };
 
-int main() {
+int main(int, char**) {
 #if defined(TEST_WORKAROUND_C1XX_BROKEN_IS_TRIVIALLY_COPYABLE)
   static_assert(!std::is_trivially_copyable<S>::value, "");
 #else
   static_assert(std::is_trivially_copyable<S>::value, "");
 #endif
+
+  return 0;
 }
diff --git a/test/support/test.workarounds/c1xx_broken_za_ctor_check.pass.cpp b/test/support/test.workarounds/c1xx_broken_za_ctor_check.pass.cpp
index 856574dbc..688a0f798 100644
--- a/test/support/test.workarounds/c1xx_broken_za_ctor_check.pass.cpp
+++ b/test/support/test.workarounds/c1xx_broken_za_ctor_check.pass.cpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -32,10 +31,12 @@ template<class T = int>
 auto test(int) -> decltype(PushFront(std::declval<T>()), std::true_type{});
 auto test(long) -> std::false_type;
 
-int main() {
+int main(int, char**) {
 #if defined(TEST_WORKAROUND_C1XX_BROKEN_ZA_CTOR_CHECK)
     static_assert(!decltype(test(0))::value, "");
 #else
     static_assert(decltype(test(0))::value, "");
 #endif
+
+  return 0;
 }
diff --git a/test/support/test_allocator.h b/test/support/test_allocator.h
index 60f9a21b2..1d6acf576 100644
--- a/test/support/test_allocator.h
+++ b/test/support/test_allocator.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/test_comparisons.h b/test/support/test_comparisons.h
index f67a84fa2..96a75039f 100644
--- a/test/support/test_comparisons.h
+++ b/test/support/test_comparisons.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //  A set of routines for testing the comparison operators of a type
@@ -23,8 +22,8 @@
 #include "test_macros.h"
 
 //  Test all six comparison operations for sanity
-template <class T>
-TEST_CONSTEXPR_CXX14 bool testComparisons6(const T& t1, const T& t2, bool isEqual, bool isLess)
+template <class T, class U = T>
+TEST_CONSTEXPR_CXX14 bool testComparisons6(const T& t1, const U& t2, bool isEqual, bool isLess)
 {
     if (isEqual)
         {
@@ -85,43 +84,43 @@ TEST_CONSTEXPR_CXX14 bool testComparisons6Values(Param val1, Param val2)
     return testComparisons6(T(val1), T(val2), isEqual, isLess);
 }
 
-template <class T>
+template <class T, class U = T>
 void AssertComparisons6AreNoexcept()
 {
-    ASSERT_NOEXCEPT(std::declval<const T&>() == std::declval<const T&>());
-    ASSERT_NOEXCEPT(std::declval<const T&>() != std::declval<const T&>());
-    ASSERT_NOEXCEPT(std::declval<const T&>() <  std::declval<const T&>());
-    ASSERT_NOEXCEPT(std::declval<const T&>() <= std::declval<const T&>());
-    ASSERT_NOEXCEPT(std::declval<const T&>() >  std::declval<const T&>());
-    ASSERT_NOEXCEPT(std::declval<const T&>() >= std::declval<const T&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() == std::declval<const U&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() != std::declval<const U&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() <  std::declval<const U&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() <= std::declval<const U&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() >  std::declval<const U&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() >= std::declval<const U&>());
 }
 
-template <class T>
+template <class T, class U = T>
 void AssertComparisons6ReturnBool()
 {
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() == std::declval<const T&>()), bool);
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() != std::declval<const T&>()), bool);
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() <  std::declval<const T&>()), bool);
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() <= std::declval<const T&>()), bool);
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() >  std::declval<const T&>()), bool);
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() >= std::declval<const T&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() == std::declval<const U&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() != std::declval<const U&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() <  std::declval<const U&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() <= std::declval<const U&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() >  std::declval<const U&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() >= std::declval<const U&>()), bool);
 }
 
 
-template <class T>
+template <class T, class U = T>
 void AssertComparisons6ConvertibleToBool()
 {
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() == std::declval<const T&>()), bool>::value), "");
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() != std::declval<const T&>()), bool>::value), "");
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() <  std::declval<const T&>()), bool>::value), "");
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() <= std::declval<const T&>()), bool>::value), "");
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() >  std::declval<const T&>()), bool>::value), "");
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() >= std::declval<const T&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() == std::declval<const U&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() != std::declval<const U&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() <  std::declval<const U&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() <= std::declval<const U&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() >  std::declval<const U&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() >= std::declval<const U&>()), bool>::value), "");
 }
 
-//  Test all six comparison operations for sanity
-template <class T>
-TEST_CONSTEXPR_CXX14 bool testComparisons2(const T& t1, const T& t2, bool isEqual)
+//  Test all two comparison operations for sanity
+template <class T, class U = T>
+TEST_CONSTEXPR_CXX14 bool testComparisons2(const T& t1, const U& t2, bool isEqual)
 {
     if (isEqual)
         {
@@ -130,7 +129,7 @@ TEST_CONSTEXPR_CXX14 bool testComparisons2(const T& t1, const T& t2, bool isEqua
         if ( (t1 != t2)) return false;
         if ( (t2 != t1)) return false;
         }
-    else /* greater */
+    else /* not equal */
         {
         if ( (t1 == t2)) return false;
         if ( (t2 == t1)) return false;
@@ -150,26 +149,26 @@ TEST_CONSTEXPR_CXX14 bool testComparisons2Values(Param val1, Param val2)
     return testComparisons2(T(val1), T(val2), isEqual);
 }
 
-template <class T>
+template <class T, class U = T>
 void AssertComparisons2AreNoexcept()
 {
-    ASSERT_NOEXCEPT(std::declval<const T&>() == std::declval<const T&>());
-    ASSERT_NOEXCEPT(std::declval<const T&>() != std::declval<const T&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() == std::declval<const U&>());
+    ASSERT_NOEXCEPT(std::declval<const T&>() != std::declval<const U&>());
 }
 
-template <class T>
+template <class T, class U = T>
 void AssertComparisons2ReturnBool()
 {
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() == std::declval<const T&>()), bool);
-    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() != std::declval<const T&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() == std::declval<const U&>()), bool);
+    ASSERT_SAME_TYPE(decltype(std::declval<const T&>() != std::declval<const U&>()), bool);
 }
 
 
-template <class T>
+template <class T, class U = T>
 void AssertComparisons2ConvertibleToBool()
 {
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() == std::declval<const T&>()), bool>::value), "");
-    static_assert((std::is_convertible<decltype(std::declval<const T&>() != std::declval<const T&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() == std::declval<const U&>()), bool>::value), "");
+    static_assert((std::is_convertible<decltype(std::declval<const T&>() != std::declval<const U&>()), bool>::value), "");
 }
 
 #endif // TEST_COMPARISONS_H
diff --git a/test/support/test_convertible.hpp b/test/support/test_convertible.hpp
index e0d42f74a..322ef506d 100644
--- a/test/support/test_convertible.hpp
+++ b/test/support/test_convertible.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/test_iterators.h b/test/support/test_iterators.h
index 0fdb225b2..a54787af1 100644
--- a/test/support/test_iterators.h
+++ b/test/support/test_iterators.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/test_macros.h b/test/support/test_macros.h
index 88cc4d5ca..8e809bfc3 100644
--- a/test/support/test_macros.h
+++ b/test/support/test_macros.h
@@ -1,17 +1,27 @@
 // -*- C++ -*-
 //===---------------------------- test_macros.h ---------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUPPORT_TEST_MACROS_HPP
 #define SUPPORT_TEST_MACROS_HPP
 
-#include <ciso646> // Get STL specific macros like _LIBCPP_VERSION
+// Attempt to get STL specific macros like _LIBCPP_VERSION using the most
+// minimal header possible. If we're testing libc++, we should use `<__config>`.
+// If <__config> isn't available, fall back to <ciso646>.
+#ifdef __has_include
+# if __has_include("<__config>")
+#   include <__config>
+#   define TEST_IMP_INCLUDED_HEADER
+# endif
+#endif
+#ifndef TEST_IMP_INCLUDED_HEADER
+#include <ciso646>
+#endif
 
 #if defined(__GNUC__)
 #pragma GCC diagnostic push
@@ -69,6 +79,7 @@
 #define TEST_CLANG_VER (__clang_major__ * 100) + __clang_minor__
 #elif defined(__GNUC__)
 #define TEST_GCC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
+#define TEST_GCC_VER_NEW (TEST_GCC_VER * 10 + __GNUC_PATCHLEVEL__)
 #endif
 
 /* Make a nice name for the standard version */
@@ -115,7 +126,11 @@
 #   define TEST_THROW_SPEC(...) throw(__VA_ARGS__)
 # endif
 #else
-#define TEST_ALIGNOF(...) __alignof(__VA_ARGS__)
+#if defined(TEST_COMPILER_CLANG)
+# define TEST_ALIGNOF(...) _Alignof(__VA_ARGS__)
+#else
+# define TEST_ALIGNOF(...) __alignof(__VA_ARGS__)
+#endif
 #define TEST_ALIGNAS(...) __attribute__((__aligned__(__VA_ARGS__)))
 #define TEST_CONSTEXPR
 #define TEST_CONSTEXPR_CXX14
@@ -210,8 +225,9 @@
 
 // FIXME: Fix this feature check when either (A) a compiler provides a complete
 // implementation, or (b) a feature check macro is specified
+#if !defined(_MSC_VER) || defined(__clang__) || _MSC_VER < 1920 || _MSVC_LANG <= 201703L
 #define TEST_HAS_NO_SPACESHIP_OPERATOR
-
+#endif
 
 #if TEST_STD_VER < 11
 #define ASSERT_NOEXCEPT(...)
diff --git a/test/support/test_memory_resource.hpp b/test/support/test_memory_resource.hpp
index 4b8167ba0..0483f3ba6 100644
--- a/test/support/test_memory_resource.hpp
+++ b/test/support/test_memory_resource.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/test_workarounds.h b/test/support/test_workarounds.h
index e88a14957..14ec96861 100644
--- a/test/support/test_workarounds.h
+++ b/test/support/test_workarounds.h
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/tracked_value.h b/test/support/tracked_value.h
index 6b75516e6..01b8c840d 100644
--- a/test/support/tracked_value.h
+++ b/test/support/tracked_value.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_TRACKED_VALUE_H
diff --git a/test/support/truncate_fp.h b/test/support/truncate_fp.h
index 83b2b2cff..1ac959ec4 100644
--- a/test/support/truncate_fp.h
+++ b/test/support/truncate_fp.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/type_id.h b/test/support/type_id.h
index 046336538..6131d27c9 100644
--- a/test/support/type_id.h
+++ b/test/support/type_id.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_TYPE_ID_H
diff --git a/test/support/unique_ptr_test_helper.h b/test/support/unique_ptr_test_helper.h
index 18c8f780b..5f56f7123 100644
--- a/test/support/unique_ptr_test_helper.h
+++ b/test/support/unique_ptr_test_helper.h
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/user_defined_integral.hpp b/test/support/user_defined_integral.hpp
index 383b65f72..a313fe6de 100644
--- a/test/support/user_defined_integral.hpp
+++ b/test/support/user_defined_integral.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_USER_DEFINED_INTEGRAL_HPP
diff --git a/test/support/uses_alloc_types.hpp b/test/support/uses_alloc_types.hpp
index 426d2583e..4b1a95d53 100644
--- a/test/support/uses_alloc_types.hpp
+++ b/test/support/uses_alloc_types.hpp
@@ -1,9 +1,8 @@
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/test/support/variant_test_helpers.hpp b/test/support/variant_test_helpers.hpp
index 759815464..59988b5f4 100644
--- a/test/support/variant_test_helpers.hpp
+++ b/test/support/variant_test_helpers.hpp
@@ -1,10 +1,9 @@
 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 #ifndef SUPPORT_VARIANT_TEST_HELPERS_HPP
diff --git a/utils/cat_files.py b/utils/cat_files.py
index 83e7632f3..ac4f38696 100755
--- a/utils/cat_files.py
+++ b/utils/cat_files.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/ci/macos-backdeployment.sh b/utils/ci/macos-backdeployment.sh
new file mode 100755
index 000000000..1f01fa397
--- /dev/null
+++ b/utils/ci/macos-backdeployment.sh
@@ -0,0 +1,180 @@
+#!/usr/bin/env bash
+
+set -ue
+
+function usage() {
+  cat <<EOM
+$(basename ${0}) [-h|--help] --libcxx-root <LIBCXX-ROOT> --libcxxabi-root <LIBCXXABI-ROOT> --std <STD> --arch <ARCHITECTURE> --deployment-target <TARGET> --sdk-version <SDK-VERSION> [--lit-args <ARGS...>]
+
+This script is used to continually test the back-deployment use case of libc++ and libc++abi on MacOS.
+
+  --libcxx-root       Full path to the root of the libc++ repository to test.
+  --libcxxabi-root    Full path to the root of the libc++abi repository to test.
+  --std               Version of the C++ Standard to run the tests under (c++03, c++11, etc..).
+  --arch              Architecture to build the tests for (32, 64).
+  --deployment-target The deployment target to run the tests for. This should be a version number of MacOS (e.g. 10.12). All MacOS versions until and including 10.7 are supported.
+  --sdk-version       The version of the SDK to test with. This should be a version number of MacOS (e.g. 10.12). We'll link against the libc++ dylib in that SDK, but we'll run against the one on the given deployment target.
+  [--lit-args]        Additional arguments to pass to lit (optional). If there are multiple arguments, quote them to pass them as a single argument to this script.
+  [--no-cleanup]      Do not cleanup the temporary directory that was used for testing at the end. This can be useful to debug failures. Make sure to clean up manually after.
+  [-h, --help]        Print this help.
+EOM
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --libcxx-root)
+    LIBCXX_ROOT="${2}"
+    if [[ ! -d "${LIBCXX_ROOT}" ]]; then
+      echo "--libcxx-root '${LIBCXX_ROOT}' is not a valid directory"
+      usage
+      exit 1
+    fi
+    shift; shift
+    ;;
+    --libcxxabi-root)
+    LIBCXXABI_ROOT="${2}"
+    if [[ ! -d "${LIBCXXABI_ROOT}" ]]; then
+      echo "--libcxxabi-root '${LIBCXXABI_ROOT}' is not a valid directory"
+      usage
+      exit 1
+    fi
+    shift; shift
+    ;;
+    --std)
+    STD="${2}"
+    shift; shift
+    ;;
+    --arch)
+    ARCH="${2}"
+    shift; shift
+    ;;
+    --deployment-target)
+    DEPLOYMENT_TARGET="${2}"
+    shift; shift
+    ;;
+    --sdk-version)
+    MACOS_SDK_VERSION="${2}"
+    shift; shift
+    ;;
+    --lit-args)
+    ADDITIONAL_LIT_ARGS="${2}"
+    shift; shift
+    ;;
+    --no-cleanup)
+    NO_CLEANUP=""
+    shift
+    ;;
+    -h|--help)
+    usage
+    exit 0
+    ;;
+    *)
+    echo "${1} is not a supported argument"
+    usage
+    exit 1
+    ;;
+  esac
+done
+
+if [[ -z ${LIBCXX_ROOT+x} ]]; then echo "--libcxx-root is a required parameter"; usage; exit 1; fi
+if [[ -z ${LIBCXXABI_ROOT+x} ]]; then echo "--libcxxabi-root is a required parameter"; usage; exit 1; fi
+if [[ -z ${STD+x} ]]; then echo "--std is a required parameter"; usage; exit 1; fi
+if [[ -z ${ARCH+x} ]]; then echo "--arch is a required parameter"; usage; exit 1; fi
+if [[ -z ${DEPLOYMENT_TARGET+x} ]]; then echo "--deployment-target is a required parameter"; usage; exit 1; fi
+if [[ -z ${MACOS_SDK_VERSION+x} ]]; then echo "--sdk-version is a required parameter"; usage; exit 1; fi
+if [[ -z ${ADDITIONAL_LIT_ARGS+x} ]]; then ADDITIONAL_LIT_ARGS=""; fi
+
+
+TEMP_DIR="$(mktemp -d)"
+echo "Created temporary directory ${TEMP_DIR}"
+function cleanup {
+  if [[ -z ${NO_CLEANUP+x} ]]; then
+    echo "Removing temporary directory ${TEMP_DIR}"
+    rm -rf "${TEMP_DIR}"
+  else
+    echo "Temporary directory is at '${TEMP_DIR}', make sure to clean it up yourself"
+  fi
+}
+trap cleanup EXIT
+
+
+LLVM_ROOT="${TEMP_DIR}/llvm"
+LIBCXX_BUILD_DIR="${TEMP_DIR}/libcxx-build"
+LIBCXX_INSTALL_DIR="${TEMP_DIR}/libcxx-install"
+LIBCXXABI_BUILD_DIR="${TEMP_DIR}/libcxxabi-build"
+LIBCXXABI_INSTALL_DIR="${TEMP_DIR}/libcxxabi-install"
+
+PREVIOUS_DYLIBS_URL="http://lab.llvm.org:8080/roots/libcxx-roots.tar.gz"
+LLVM_TARBALL_URL="https://github.com/llvm-mirror/llvm/archive/master.tar.gz"
+export CC="$(xcrun --find clang)"
+export CXX="$(xcrun --find clang++)"
+
+
+echo "@@@ Downloading LLVM tarball of master (only used for CMake configuration) @@@"
+mkdir "${LLVM_ROOT}"
+curl -L "${LLVM_TARBALL_URL}" | tar -xz --strip-components=1 -C "${LLVM_ROOT}"
+echo "@@@@@@"
+
+
+echo "@@@ Configuring architecture-related stuff @@@"
+if [[ "${ARCH}" == "64" ]]; then CMAKE_ARCH_STRING="x86_64"; else CMAKE_ARCH_STRING="i386"; fi
+if [[ "${ARCH}" == "64" ]]; then LIT_ARCH_STRING="";         else LIT_ARCH_STRING="--param=enable_32bit=true"; fi
+echo "@@@@@@"
+
+
+echo "@@@ Configuring CMake for libc++ @@@"
+mkdir -p "${LIBCXX_BUILD_DIR}"
+(cd "${LIBCXX_BUILD_DIR}" &&
+  xcrun cmake "${LIBCXX_ROOT}" -GNinja \
+    -DLLVM_PATH="${LLVM_ROOT}" \
+    -DCMAKE_INSTALL_PREFIX="${LIBCXX_INSTALL_DIR}" \
+    -DCMAKE_OSX_ARCHITECTURES="${CMAKE_ARCH_STRING}"
+)
+echo "@@@@@@"
+
+
+echo "@@@ Configuring CMake for libc++abi @@@"
+mkdir -p "${LIBCXXABI_BUILD_DIR}"
+(cd "${LIBCXXABI_BUILD_DIR}" &&
+  xcrun cmake "${LIBCXXABI_ROOT}" -GNinja \
+    -DLIBCXXABI_LIBCXX_PATH="${LIBCXX_ROOT}" \
+    -DLLVM_PATH="${LLVM_ROOT}" \
+    -DCMAKE_INSTALL_PREFIX="${LIBCXXABI_INSTALL_DIR}" \
+    -DCMAKE_OSX_ARCHITECTURES="${CMAKE_ARCH_STRING}"
+)
+echo "@@@@@@"
+
+
+echo "@@@ Installing the latest libc++ headers @@@"
+ninja -C "${LIBCXX_BUILD_DIR}" install-cxx-headers
+echo "@@@@@@"
+
+
+echo "@@@ Downloading dylibs for older deployment targets @@@"
+# TODO: The tarball should contain libc++abi.dylib too, we shouldn't be relying on the system's
+# TODO: We should also link against the libc++abi.dylib that was shipped in the SDK
+PREVIOUS_DYLIBS_DIR="${TEMP_DIR}/libcxx-dylibs"
+mkdir "${PREVIOUS_DYLIBS_DIR}"
+curl "${PREVIOUS_DYLIBS_URL}" | tar -xz --strip-components=1 -C "${PREVIOUS_DYLIBS_DIR}"
+LIBCXX_ON_DEPLOYMENT_TARGET="${PREVIOUS_DYLIBS_DIR}/macOS/${DEPLOYMENT_TARGET}/libc++.dylib"
+LIBCXXABI_ON_DEPLOYMENT_TARGET="/usr/lib/libc++abi.dylib"
+LIBCXX_IN_SDK="${PREVIOUS_DYLIBS_DIR}/macOS/${MACOS_SDK_VERSION}/libc++.dylib"
+echo "@@@@@@"
+
+
+# TODO: We need to also run the tests for libc++abi.
+# TODO: Make sure lit will actually run against the libc++abi we specified
+echo "@@@ Running tests for libc++ @@@"
+"${LIBCXX_BUILD_DIR}/bin/llvm-lit" -sv "${LIBCXX_ROOT}/test" \
+                                   --param=enable_experimental=false \
+                                   --param=enable_filesystem=false \
+                                   ${LIT_ARCH_STRING} \
+                                   --param=cxx_under_test="${CXX}" \
+                                   --param=cxx_headers="${LIBCXX_INSTALL_DIR}/include/c++/v1" \
+                                   --param=std="${STD}" \
+                                   --param=platform="macosx${DEPLOYMENT_TARGET}" \
+                                   --param=cxx_runtime_root="$(dirname "${LIBCXX_ON_DEPLOYMENT_TARGET}")" \
+                                   --param=abi_library_path="$(dirname "${LIBCXXABI_ON_DEPLOYMENT_TARGET}")" \
+                                   --param=use_system_cxx_lib="$(dirname "${LIBCXX_IN_SDK}")" \
+                                   ${ADDITIONAL_LIT_ARGS}
+echo "@@@@@@"
diff --git a/utils/ci/macos-trunk.sh b/utils/ci/macos-trunk.sh
new file mode 100755
index 000000000..b64633387
--- /dev/null
+++ b/utils/ci/macos-trunk.sh
@@ -0,0 +1,161 @@
+#!/usr/bin/env bash
+
+set -ue
+
+function usage() {
+  cat <<EOM
+$(basename ${0}) [-h|--help] --libcxx-root <LIBCXX-ROOT> --libcxxabi-root <LIBCXXABI-ROOT> --std <STD> --arch <ARCHITECTURE> [--lit-args <ARGS...>]
+
+This script is used to continually test libc++ and libc++abi trunk on MacOS.
+
+  --libcxx-root       Full path to the root of the libc++ repository to test.
+  --libcxxabi-root    Full path to the root of the libc++abi repository to test.
+  --std               Version of the C++ Standard to run the tests under (c++03, c++11, etc..).
+  --arch              Architecture to build the tests for (32, 64).
+  --libcxx-exceptions Whether to enable exceptions when building libc++ and running the libc++ tests. libc++abi is always built with support for exceptions because other libraries in the runtime depend on it (like libobjc). This must be ON or OFF.
+  [--lit-args]        Additional arguments to pass to lit (optional). If there are multiple arguments, quote them to pass them as a single argument to this script.
+  [--no-cleanup]      Do not cleanup the temporary directory that was used for testing at the end. This can be useful to debug failures. Make sure to clean up manually after.
+  [-h, --help]        Print this help.
+EOM
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --libcxx-root)
+    LIBCXX_ROOT="${2}"
+    if [[ ! -e "${LIBCXX_ROOT}" ]]; then
+      echo "--libcxx-root '${LIBCXX_ROOT}' is not a valid directory"
+      usage
+      exit 1
+    fi
+    shift; shift
+    ;;
+    --libcxxabi-root)
+    LIBCXXABI_ROOT="${2}"
+    if [[ ! -e "${LIBCXXABI_ROOT}" ]]; then
+      echo "--libcxxabi-root '${LIBCXXABI_ROOT}' is not a valid directory"
+      usage
+      exit 1
+    fi
+    shift; shift
+    ;;
+    --std)
+    STD="${2}"
+    shift; shift
+    ;;
+    --arch)
+    ARCH="${2}"
+    shift; shift
+    ;;
+    --libcxx-exceptions)
+    LIBCXX_EXCEPTIONS="${2}"
+    shift; shift
+    ;;
+    --lit-args)
+    ADDITIONAL_LIT_ARGS="${2}"
+    shift; shift
+    ;;
+    --no-cleanup)
+    NO_CLEANUP=""
+    shift
+    ;;
+    -h|--help)
+    usage
+    exit 0
+    ;;
+    *)
+    echo "${1} is not a supported argument"
+    usage
+    exit 1
+    ;;
+  esac
+done
+
+if [[ -z ${LIBCXX_ROOT+x} ]]; then echo "--libcxx-root is a required parameter"; usage; exit 1; fi
+if [[ -z ${LIBCXXABI_ROOT+x} ]]; then echo "--libcxxabi-root is a required parameter"; usage; exit 1; fi
+if [[ -z ${STD+x} ]]; then echo "--std is a required parameter"; usage; exit 1; fi
+if [[ -z ${ARCH+x} ]]; then echo "--arch is a required parameter"; usage; exit 1; fi
+if [[ "${LIBCXX_EXCEPTIONS}" != "ON" && "${LIBCXX_EXCEPTIONS}" != "OFF" ]]; then echo "--libcxx-exceptions is a required parameter and must be either ON or OFF"; usage; exit 1; fi
+if [[ -z ${ADDITIONAL_LIT_ARGS+x} ]]; then ADDITIONAL_LIT_ARGS=""; fi
+
+
+TEMP_DIR="$(mktemp -d)"
+echo "Created temporary directory ${TEMP_DIR}"
+function cleanup {
+  if [[ -z ${NO_CLEANUP+x} ]]; then
+    echo "Removing temporary directory ${TEMP_DIR}"
+    rm -rf "${TEMP_DIR}"
+  else
+    echo "Temporary directory is at '${TEMP_DIR}', make sure to clean it up yourself"
+  fi
+}
+trap cleanup EXIT
+
+
+LLVM_ROOT="${TEMP_DIR}/llvm"
+LIBCXX_BUILD_DIR="${TEMP_DIR}/libcxx-build"
+LIBCXX_INSTALL_DIR="${TEMP_DIR}/libcxx-install"
+LIBCXXABI_BUILD_DIR="${TEMP_DIR}/libcxxabi-build"
+LIBCXXABI_INSTALL_DIR="${TEMP_DIR}/libcxxabi-install"
+
+LLVM_TARBALL_URL="https://github.com/llvm-mirror/llvm/archive/master.tar.gz"
+export CC="$(xcrun --find clang)"
+export CXX="$(xcrun --find clang++)"
+
+
+echo "@@@ Downloading LLVM tarball of master (only used for CMake configuration) @@@"
+mkdir "${LLVM_ROOT}"
+curl -L "${LLVM_TARBALL_URL}" | tar -xz --strip-components=1 -C "${LLVM_ROOT}"
+echo "@@@@@@"
+
+
+echo "@@@ Setting up LIT flags @@@"
+LIT_FLAGS="-sv --param=std=${STD} ${ADDITIONAL_LIT_ARGS}"
+if [[ "${ARCH}" == "32" ]]; then
+  LIT_FLAGS+=" --param=enable_32bit=true"
+fi
+echo "@@@@@@"
+
+
+echo "@@@ Configuring CMake for libc++ @@@"
+mkdir -p "${LIBCXX_BUILD_DIR}"
+(cd "${LIBCXX_BUILD_DIR}" &&
+  xcrun cmake "${LIBCXX_ROOT}" -GNinja \
+    -DLLVM_PATH="${LLVM_ROOT}" \
+    -DCMAKE_INSTALL_PREFIX="${LIBCXX_INSTALL_DIR}" \
+    -DLIBCXX_ENABLE_EXCEPTIONS="${LIBCXX_EXCEPTIONS}" \
+    -DLLVM_LIT_ARGS="${LIT_FLAGS}" \
+    -DCMAKE_OSX_ARCHITECTURES="i386;x86_64" # Build a universal dylib
+)
+echo "@@@@@@"
+
+
+echo "@@@ Configuring CMake for libc++abi @@@"
+mkdir -p "${LIBCXXABI_BUILD_DIR}"
+(cd "${LIBCXXABI_BUILD_DIR}" &&
+  xcrun cmake "${LIBCXXABI_ROOT}" -GNinja \
+    -DLIBCXXABI_LIBCXX_PATH="${LIBCXX_ROOT}" \
+    -DLLVM_PATH="${LLVM_ROOT}" \
+    -DCMAKE_INSTALL_PREFIX="${LIBCXXABI_INSTALL_DIR}" \
+    -DLIBCXXABI_ENABLE_EXCEPTIONS=ON \
+    -DLLVM_LIT_ARGS="${LIT_FLAGS}" \
+    -DCMAKE_OSX_ARCHITECTURES="i386;x86_64" # Build a universal dylib
+)
+echo "@@@@@@"
+
+
+echo "@@@ Building libc++.dylib and libc++abi.dylib from sources (just to make sure it works) @@@"
+ninja -C "${LIBCXX_BUILD_DIR}" install-cxx
+ninja -C "${LIBCXXABI_BUILD_DIR}" install-cxxabi
+echo "@@@@@@"
+
+
+echo "@@@ Running tests for libc++ @@@"
+# TODO: We should run check-cxx-abilist too
+ninja -C "${LIBCXX_BUILD_DIR}" check-cxx
+echo "@@@@@@"
+
+
+echo "@@@ Running tests for libc++abi @@@"
+ninja -C "${LIBCXXABI_BUILD_DIR}" check-cxxabi
+echo "@@@@@@"
diff --git a/utils/docker/build_docker_image.sh b/utils/docker/build_docker_image.sh
deleted file mode 100755
index 0d2d6d313..000000000
--- a/utils/docker/build_docker_image.sh
+++ /dev/null
@@ -1,109 +0,0 @@
-#!/bin/bash
-#===- libcxx/utils/docker/build_docker_image.sh ----------------------------===//
-#
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-#
-#===----------------------------------------------------------------------===//
-set -e
-
-IMAGE_SOURCE=""
-DOCKER_REPOSITORY=""
-DOCKER_TAG=""
-
-function show_usage() {
-  cat << EOF
-Usage: build_docker_image.sh [options] [-- [cmake_args]...]
-
-Available options:
-  General:
-    -h|--help               show this help message
-  Docker-specific:
-    -s|--source             image source dir (i.e. debian8, nvidia-cuda, etc)
-    -d|--docker-repository  docker repository for the image
-    -t|--docker-tag         docker tag for the image
-
-Required options: --source and --docker-repository.
-
-For example, running:
-$ build_docker_image.sh -s debian9 -d mydocker/debian9-clang -t latest
-will produce two docker images:
-    mydocker/debian9-clang-build:latest - an intermediate image used to compile
-      clang.
-    mydocker/clang-debian9:latest       - a small image with preinstalled clang.
-Please note that this example produces a not very useful installation, since it
-doesn't override CMake defaults, which produces a Debug and non-boostrapped
-version of clang.
-EOF
-}
-
-while [[ $# -gt 0 ]]; do
-  case "$1" in
-    -h|--help)
-      show_usage
-      exit 0
-      ;;
-    -s|--source)
-      shift
-      IMAGE_SOURCE="$1"
-      shift
-      ;;
-    -d|--docker-repository)
-      shift
-      DOCKER_REPOSITORY="$1"
-      shift
-      ;;
-    -t|--docker-tag)
-      shift
-      DOCKER_TAG="$1"
-      shift
-      ;;
-    *)
-      echo "Unknown argument $1"
-      exit 1
-      ;;
-  esac
-done
-
-
-command -v docker >/dev/null ||
-  {
-    echo "Docker binary cannot be found. Please install Docker to use this script."
-    exit 1
-  }
-
-if [ "$IMAGE_SOURCE" == "" ]; then
-  echo "Required argument missing: --source"
-  exit 1
-fi
-
-if [ "$DOCKER_REPOSITORY" == "" ]; then
-  echo "Required argument missing: --docker-repository"
-  exit 1
-fi
-
-SOURCE_DIR=$(dirname $0)
-if [ ! -d "$SOURCE_DIR/$IMAGE_SOURCE" ]; then
-  echo "No sources for '$IMAGE_SOURCE' were found in $SOURCE_DIR"
-  exit 1
-fi
-
-BUILD_DIR=$(mktemp -d)
-trap "rm -rf $BUILD_DIR" EXIT
-echo "Using a temporary directory for the build: $BUILD_DIR"
-
-cp -r "$SOURCE_DIR/$IMAGE_SOURCE" "$BUILD_DIR/$IMAGE_SOURCE"
-cp -r "$SOURCE_DIR/scripts" "$BUILD_DIR/scripts"
-
-
-if [ "$DOCKER_TAG" != "" ]; then
-  DOCKER_TAG=":$DOCKER_TAG"
-fi
-
-echo "Building ${DOCKER_REPOSITORY}${DOCKER_TAG} from $IMAGE_SOURCE"
-docker build -t "${DOCKER_REPOSITORY}${DOCKER_TAG}" \
-  -f "$BUILD_DIR/$IMAGE_SOURCE/Dockerfile" \
-  "$BUILD_DIR"
-echo "Done"
diff --git a/utils/docker/debian9/Dockerfile b/utils/docker/debian9/Dockerfile
index 8dc43f401..f93670b48 100644
--- a/utils/docker/debian9/Dockerfile
+++ b/utils/docker/debian9/Dockerfile
@@ -1,14 +1,13 @@
-#===- libcxx/utils/docker/debian9/Dockerfile -------------------------===//
+#===- libcxx/utils/docker/debian9/Dockerfile --------------------------------------------------===//
 #
-#                     The LLVM Compiler Infrastructure
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-#
-#===----------------------------------------------------------------------===//
+#===-------------------------------------------------------------------------------------------===//
 
 # Setup the base builder image with the packages we'll need to build GCC and Clang from source.
-FROM launcher.gcr.io/google/debian9:latest as builder-base
+FROM launcher.gcr.io/google/debian9:latest AS builder-base
 LABEL maintainer "libc++ Developers"
 
 RUN apt-get update && \
@@ -34,52 +33,127 @@ RUN apt-get update && \
       autoconf \
       binutils-dev \
       binutils-gold \
-      software-properties-common && \
+      software-properties-common \
+      gnupg \
+      apt-transport-https \
+      systemd \
+      sysvinit-utils && \
   update-alternatives --install "/usr/bin/ld" "ld" "/usr/bin/ld.gold" 20 && \
-  update-alternatives --install "/usr/bin/ld" "ld" "/usr/bin/ld.bfd" 10
+  update-alternatives --install "/usr/bin/ld" "ld" "/usr/bin/ld.bfd" 10 && \
+  rm -rf /var/lib/apt/lists/*
+
+
+# Build GCC versions
+FROM builder-base as gcc-48-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_gcc_version.sh /tmp/build_gcc_version.sh
+RUN /tmp/build_gcc_version.sh --install /opt/gcc-4.8.5 --branch gcc-4_8_5-release \
+    --cherry-pick ec1cc0263f156f70693a62cf17b254a0029f4852
 
-# Build GCC 4.9 for testing our C++11 against
 FROM builder-base as gcc-49-builder
 LABEL maintainer "libc++ Developers"
 
-ADD scripts/build_gcc.sh /tmp/build_gcc.sh
+ADD scripts/build_gcc_version.sh /tmp/build_gcc_version.sh
+RUN /tmp/build_gcc_version.sh --install /opt/gcc-4.9.4 --branch gcc-4_9_4-release
+
+FROM builder-base as gcc-5-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_gcc_version.sh /tmp/build_gcc_version.sh
+RUN /tmp/build_gcc_version.sh --install /opt/gcc-5 --branch gcc-5_5_0-release
+
+FROM builder-base as gcc-6-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_gcc_version.sh /tmp/build_gcc_version.sh
+RUN /tmp/build_gcc_version.sh --install /opt/gcc-6 --branch gcc-6_5_0-release
+
+FROM builder-base as gcc-7-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_gcc_version.sh /tmp/build_gcc_version.sh
+RUN /tmp/build_gcc_version.sh --install /opt/gcc-7 --branch gcc-7_4_0-release
+
+FROM builder-base as gcc-8-builder
+LABEL maintainer "libc++ Developers"
 
-RUN git clone --depth=1 --branch gcc-4_9_4-release git://gcc.gnu.org/git/gcc.git /tmp/gcc-4.9.4
-RUN cd /tmp/gcc-4.9.4/ && ./contrib/download_prerequisites
-RUN /tmp/build_gcc.sh --source /tmp/gcc-4.9.4 --to /opt/gcc-4.9.4
+ADD scripts/build_gcc_version.sh /tmp/build_gcc_version.sh
+RUN /tmp/build_gcc_version.sh --install /opt/gcc-8 --branch gcc-8_2_0-release
 
-# Build GCC ToT for testing in all dialects.
 FROM builder-base as gcc-tot-builder
 LABEL maintainer "libc++ Developers"
 
-ADD scripts/build_gcc.sh /tmp/build_gcc.sh
+ADD scripts/build_gcc_version.sh /tmp/build_gcc_version.sh
+RUN /tmp/build_gcc_version.sh --install /opt/gcc-tot --branch master
+
+# Build additional LLVM versions
+FROM builder-base as llvm-36-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-3.6 --branch release/3.6.x
+
+FROM builder-base as llvm-37-builder
+LABEL maintainer "libc++ Developers"
 
-RUN git clone --depth=1 git://gcc.gnu.org/git/gcc.git /tmp/gcc-tot
-RUN cd /tmp/gcc-tot && ./contrib/download_prerequisites
-RUN /tmp/build_gcc.sh --source /tmp/gcc-tot --to /opt/gcc-tot
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-3.7 --branch release/3.7.x
+
+FROM builder-base as llvm-38-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-3.8 --branch release/3.8.x
+
+FROM builder-base as llvm-39-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-3.9 --branch release/3.9.x
 
-# Build LLVM 4.0 which is used to test against a "legacy" compiler.
 FROM builder-base as llvm-4-builder
 LABEL maintainer "libc++ Developers"
 
-ADD scripts/checkout_git.sh /tmp/checkout_git.sh
-ADD scripts/build_install_llvm.sh /tmp/build_install_llvm.sh
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-4.0 --branch release/4.x
 
-RUN /tmp/checkout_git.sh --to /tmp/llvm-4.0 -p clang -p compiler-rt --branch release_40
-RUN /tmp/build_install_llvm.sh \
-    --install /opt/llvm-4.0 \
-    --source /tmp/llvm-4.0 \
-    --build /tmp/build-llvm-4.0 \
-    -i install-clang -i install-clang-headers \
-    -i install-compiler-rt \
-    -- \
-    -DCMAKE_BUILD_TYPE=RELEASE \
-    -DLLVM_ENABLE_ASSERTIONS=ON
+FROM builder-base as llvm-5-builder
+LABEL maintainer "libc++ Developers"
 
-# Stage 2. Produce a minimal release image with build results.
-FROM launcher.gcr.io/google/debian9:latest
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-5.0 --branch release/5.x
+
+FROM builder-base as llvm-6-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-6.0 --branch release/6.x
+
+FROM builder-base as llvm-7-builder
 LABEL maintainer "libc++ Developers"
 
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-7.0 --branch release/7.x
+
+FROM builder-base as llvm-8-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-8.0 --branch release/8.x
+
+FROM builder-base as llvm-tot-builder
+LABEL maintainer "libc++ Developers"
+
+ADD scripts/build_llvm_version.sh /tmp/build_llvm_version.sh
+RUN /tmp/build_llvm_version.sh --install /opt/llvm-tot --branch master
+
+
+#===-------------------------------------------------------------------------------------------===//
+# buildslave
+#===-------------------------------------------------------------------------------------------===//
+FROM builder-base AS buildbot
+
 # Copy over the GCC and Clang installations
 COPY --from=gcc-49-builder /opt/gcc-4.9.4 /opt/gcc-4.9.4
 COPY --from=gcc-tot-builder /opt/gcc-tot /opt/gcc-tot
@@ -89,27 +163,40 @@ RUN ln -s /opt/gcc-4.9.4/bin/gcc /usr/local/bin/gcc-4.9 && \
     ln -s /opt/gcc-4.9.4/bin/g++ /usr/local/bin/g++-4.9
 
 RUN apt-get update && \
-    apt-get install -y \
-      ca-certificates \
-      gnupg \
-      build-essential \
-      apt-transport-https \
-      curl \
-      software-properties-common
-
-RUN apt-get install -y --no-install-recommends \
-    systemd \
-    sysvinit-utils \
-    cmake \
-    subversion \
-    git \
-    ninja-build \
-    gcc-multilib \
-    g++-multilib \
-    python \
-    buildbot-slave
+    apt-get install -y --no-install-recommends \
+    bash-completion \
+    buildbot-slave \
+  && rm -rf /var/lib/apt/lists/*
 
 ADD scripts/install_clang_packages.sh /tmp/install_clang_packages.sh
 RUN /tmp/install_clang_packages.sh && rm /tmp/install_clang_packages.sh
 
 RUN git clone https://git.llvm.org/git/libcxx.git /libcxx
+
+#===-------------------------------------------------------------------------------------------===//
+#  compiler-zoo
+#===-------------------------------------------------------------------------------------------===//
+FROM  buildbot AS compiler-zoo
+LABEL maintainer "libc++ Developers"
+
+# Copy over the GCC and Clang installations
+COPY --from=gcc-48-builder /opt/gcc-4.8.5 /opt/gcc-4.8.5
+COPY --from=gcc-49-builder /opt/gcc-4.9.4 /opt/gcc-4.9.4
+COPY --from=gcc-5-builder /opt/gcc-5   /opt/gcc-5
+COPY --from=gcc-6-builder /opt/gcc-6   /opt/gcc-6
+COPY --from=gcc-7-builder /opt/gcc-7   /opt/gcc-7
+COPY --from=gcc-8-builder /opt/gcc-8   /opt/gcc-8
+COPY --from=gcc-tot-builder /opt/gcc-tot /opt/gcc-tot
+
+COPY --from=llvm-36-builder /opt/llvm-3.6 /opt/llvm-3.6
+COPY --from=llvm-37-builder /opt/llvm-3.7 /opt/llvm-3.7
+COPY --from=llvm-38-builder /opt/llvm-3.8 /opt/llvm-3.8
+COPY --from=llvm-39-builder /opt/llvm-3.9 /opt/llvm-3.9
+COPY --from=llvm-4-builder /opt/llvm-4.0 /opt/llvm-4.0
+COPY --from=llvm-5-builder /opt/llvm-5.0 /opt/llvm-5.0
+COPY --from=llvm-6-builder /opt/llvm-6.0 /opt/llvm-6.0
+COPY --from=llvm-7-builder /opt/llvm-7.0 /opt/llvm-7.0
+COPY --from=llvm-8-builder /opt/llvm-8.0 /opt/llvm-8.0
+COPY --from=llvm-tot-builder /opt/llvm-tot /opt/llvm-tot
+
+
diff --git a/utils/docker/docker-compose.yml b/utils/docker/docker-compose.yml
new file mode 100644
index 000000000..5e8e5a4a7
--- /dev/null
+++ b/utils/docker/docker-compose.yml
@@ -0,0 +1,14 @@
+version: '3.4'
+services:
+  buildbot:
+    build:
+      context: .
+      dockerfile: debian9/Dockerfile
+      target: buildbot
+    image: ericwf/libcxx-buildbot-base:latest
+  compiler-zoo:
+    build:
+      context: .
+      dockerfile: debian9/Dockerfile
+      target: compiler-zoo
+    image: ericwf/compiler-zoo:latest
diff --git a/utils/docker/scripts/build_gcc.sh b/utils/docker/scripts/build_gcc.sh
deleted file mode 100755
index 85feb16ac..000000000
--- a/utils/docker/scripts/build_gcc.sh
+++ /dev/null
@@ -1,91 +0,0 @@
-#!/usr/bin/env bash
-#===- libcxx/utils/docker/scripts/build-gcc.sh ----------------------------===//
-#
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-#
-#===-----------------------------------------------------------------------===//
-
-set -e
-
-
-function show_usage() {
-  cat << EOF
-Usage: build-gcc.sh [options]
-
-Run autoconf with the specified arguments. Used inside docker container.
-
-Available options:
-  -h|--help           show this help message
-  --source            the source path from which to run the configuration.
-  --to                destination directory where to install the targets.
-Required options: --to, at least one --install-target.
-
-All options after '--' are passed to CMake invocation.
-EOF
-}
-
-GCC_INSTALL_DIR=""
-GCC_SOURCE_DIR=""
-
-while [[ $# -gt 0 ]]; do
-  case "$1" in
-    --to)
-      shift
-      GCC_INSTALL_DIR="$1"
-      shift
-      ;;
-    --source)
-      shift
-      GCC_SOURCE_DIR="$1"
-      shift
-      ;;
-    -h|--help)
-      show_usage
-      exit 0
-      ;;
-    *)
-      echo "Unknown option: $1"
-      exit 1
-  esac
-done
-
-if [ "$GCC_INSTALL_DIR" == "" ]; then
-  echo "No install directory. Please specify the --to argument."
-  exit 1
-fi
-
-if [ "$GCC_SOURCE_DIR" == "" ]; then
-  echo "No source directory. Please specify the --source argument."
-  exit 1
-fi
-
-GCC_NAME=`basename $GCC_SOURCE_DIR`
-GCC_BUILD_DIR="/tmp/gcc-build-root/build-$GCC_NAME"
-
-mkdir -p "$GCC_INSTALL_DIR"
-mkdir -p "$GCC_BUILD_DIR"
-pushd "$GCC_BUILD_DIR"
-
-# Run the build as specified in the build arguments.
-echo "Running configuration"
-$GCC_SOURCE_DIR/configure --prefix=$GCC_INSTALL_DIR \
-  --disable-bootstrap --disable-libgomp --disable-libitm \
-  --disable-libvtv --disable-libcilkrts --disable-libmpx \
-  --disable-liboffloadmic --disable-libcc1 --enable-languages=c,c++
-
-NPROC=`nproc`
-echo "Running build with $NPROC threads"
-make -j$NPROC
-
-echo "Installing to $GCC_INSTALL_DIR"
-make install -j$NPROC
-
-popd
-
-# Cleanup.
-rm -rf "$GCC_BUILD_DIR"
-
-echo "Done"
\ No newline at end of file
diff --git a/utils/docker/scripts/build_gcc_version.sh b/utils/docker/scripts/build_gcc_version.sh
new file mode 100755
index 000000000..68aa4c67e
--- /dev/null
+++ b/utils/docker/scripts/build_gcc_version.sh
@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+#===- libcxx/utils/docker/scripts/build-gcc.sh ----------------------------===//
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===-----------------------------------------------------------------------===//
+
+set -e
+
+function show_usage() {
+  cat << EOF
+Usage: build_gcc_version.sh [options]
+
+Run autoconf with the specified arguments. Used inside docker container.
+
+Available options:
+  -h|--help           show this help message
+  --branch            the branch of gcc you want to build.
+  --cherry-pick       a commit hash to apply to the GCC sources.
+  --install           destination directory where to install the targets.
+Required options: --install and --branch
+
+All options after '--' are passed to CMake invocation.
+EOF
+}
+
+GCC_INSTALL_DIR=""
+GCC_BRANCH=""
+CHERRY_PICK=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --install)
+      shift
+      GCC_INSTALL_DIR="$1"
+      shift
+      ;;
+    --branch)
+      shift
+      GCC_BRANCH="$1"
+      shift
+      ;;
+    --cherry-pick)
+      shift
+      CHERRY_PICK="$1"
+      shift
+      ;;
+    -h|--help)
+      show_usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown option: $1"
+      exit 1
+  esac
+done
+
+if [ "$GCC_INSTALL_DIR" == "" ]; then
+  echo "No install directory. Please specify the --install argument."
+  exit 1
+fi
+
+if [ "$GCC_BRANCH" == "" ]; then
+  echo "No branch specified. Please specify the --branch argument."
+  exit 1
+fi
+
+set -x
+
+NPROC=`nproc`
+TMP_ROOT="$(mktemp -d -p /tmp)"
+GCC_SOURCE_DIR="$TMP_ROOT/gcc"
+GCC_BUILD_DIR="$TMP_ROOT/build"
+
+echo "Cloning source directory for branch $GCC_BRANCH"
+git clone --branch "$GCC_BRANCH" --single-branch --depth=1 git://gcc.gnu.org/git/gcc.git $GCC_SOURCE_DIR
+
+pushd "$GCC_SOURCE_DIR"
+if [ "$CHERRY_PICK" != "" ]; then
+  git fetch origin trunk --unshallow # Urg, we have to get the entire history. This will take a while.
+  git cherry-pick --no-commit -X theirs "$CHERRY_PICK"
+fi
+./contrib/download_prerequisites
+popd
+
+
+mkdir "$GCC_BUILD_DIR"
+pushd "$GCC_BUILD_DIR"
+
+# Run the build as specified in the build arguments.
+echo "Running configuration"
+$GCC_SOURCE_DIR/configure --prefix=$GCC_INSTALL_DIR \
+  --disable-bootstrap --disable-libgomp --disable-libitm \
+  --disable-libvtv --disable-libcilkrts --disable-libmpx \
+  --disable-liboffloadmic --disable-libcc1 --enable-languages=c,c++
+
+echo "Running build with $NPROC threads"
+make -j$NPROC
+echo "Installing to $GCC_INSTALL_DIR"
+make install -j$NPROC
+popd
+
+# Cleanup.
+rm -rf "$TMP_ROOT"
+
+echo "Done"
\ No newline at end of file
diff --git a/utils/docker/scripts/build_install_llvm.sh b/utils/docker/scripts/build_install_llvm.sh
deleted file mode 100755
index 6f19a96a1..000000000
--- a/utils/docker/scripts/build_install_llvm.sh
+++ /dev/null
@@ -1,114 +0,0 @@
-#!/usr/bin/env bash
-#===- llvm/utils/docker/scripts/build_install_llvm.sh ---------------------===//
-#
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-#
-#===-----------------------------------------------------------------------===//
-
-set -e
-
-function show_usage() {
-  cat << EOF
-Usage: build_install_llvm.sh [options] -- [cmake-args]
-
-Run cmake with the specified arguments. Used inside docker container.
-Passes additional -DCMAKE_INSTALL_PREFIX and puts the build results into
-the directory specified by --to option.
-
-Available options:
-  -h|--help           show this help message
-  -i|--install-target name of a cmake install target to build and include in
-                      the resulting archive. Can be specified multiple times.
-  --install           destination directory where to install the targets.
-  --source            location of the source tree.
-  --build             location to use as the build directory.
-Required options: --to, --source, --build, and at least one --install-target.
-
-All options after '--' are passed to CMake invocation.
-EOF
-}
-
-CMAKE_ARGS=""
-CMAKE_INSTALL_TARGETS=""
-CLANG_INSTALL_DIR=""
-CLANG_SOURCE_DIR=""
-CLANG_BUILD_DIR=""
-
-while [[ $# -gt 0 ]]; do
-  case "$1" in
-    -i|--install-target)
-      shift
-      CMAKE_INSTALL_TARGETS="$CMAKE_INSTALL_TARGETS $1"
-      shift
-      ;;
-    --source)
-      shift
-      CLANG_SOURCE_DIR="$1"
-      shift
-      ;;
-    --build)
-      shift
-      CLANG_BUILD_DIR="$1"
-      shift
-      ;;
-    --install)
-      shift
-      CLANG_INSTALL_DIR="$1"
-      shift
-      ;;
-    --)
-      shift
-      CMAKE_ARGS="$*"
-      shift $#
-      ;;
-    -h|--help)
-      show_usage
-      exit 0
-      ;;
-    *)
-      echo "Unknown option: $1"
-      exit 1
-  esac
-done
-
-if [ "$CLANG_SOURCE_DIR" == "" ]; then
-  echo "No source directory. Please pass --source."
-  exit 1
-fi
-
-if [ "$CLANG_BUILD_DIR" == "" ]; then
-  echo "No build directory. Please pass --build"
-  exit 1
-fi
-
-if [ "$CMAKE_INSTALL_TARGETS" == "" ]; then
-  echo "No install targets. Please pass one or more --install-target."
-  exit 1
-fi
-
-if [ "$CLANG_INSTALL_DIR" == "" ]; then
-  echo "No install directory. Please specify the --to argument."
-  exit 1
-fi
-
-echo "Building in $CLANG_BUILD_DIR"
-mkdir -p "$CLANG_BUILD_DIR"
-pushd "$CLANG_BUILD_DIR"
-
-# Run the build as specified in the build arguments.
-echo "Running build"
-cmake -GNinja \
-  -DCMAKE_INSTALL_PREFIX="$CLANG_INSTALL_DIR" \
-  $CMAKE_ARGS \
-  "$CLANG_SOURCE_DIR"
-ninja $CMAKE_INSTALL_TARGETS
-
-popd
-
-# Cleanup.
-rm -rf "$CLANG_BUILD_DIR"
-
-echo "Done"
diff --git a/utils/docker/scripts/build_llvm_version.sh b/utils/docker/scripts/build_llvm_version.sh
new file mode 100755
index 000000000..613a7babd
--- /dev/null
+++ b/utils/docker/scripts/build_llvm_version.sh
@@ -0,0 +1,106 @@
+#!/usr/bin/env bash
+#===- libcxx/utils/docker/scripts/build_install_llvm_version_default.sh -----------------------===//
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===-------------------------------------------------------------------------------------------===//
+
+set -e
+
+function show_usage() {
+  cat << EOF
+Usage: build_install_llvm.sh [options] -- [cmake-args]
+
+Run cmake with the specified arguments. Used inside docker container.
+Passes additional -DCMAKE_INSTALL_PREFIX and puts the build results into
+the directory specified by --to option.
+
+Available options:
+  -h|--help           show this help message
+  --install           destination directory where to install the targets.
+  --branch            the branch or tag of LLVM to build
+Required options: --install, and --version.
+
+All options after '--' are passed to CMake invocation.
+EOF
+}
+
+LLVM_BRANCH=""
+CMAKE_ARGS=""
+LLVM_INSTALL_DIR=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --install)
+      shift
+      LLVM_INSTALL_DIR="$1"
+      shift
+      ;;
+    --branch)
+      shift
+      LLVM_BRANCH="$1"
+      shift
+      ;;
+    --)
+      shift
+      CMAKE_ARGS="$*"
+      shift $#
+      ;;
+    -h|--help)
+      show_usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown option: $1"
+      exit 1
+  esac
+done
+
+
+if [ "$LLVM_INSTALL_DIR" == "" ]; then
+  echo "No install directory. Please specify the --install argument."
+  exit 1
+fi
+
+if [ "$LLVM_BRANCH" == "" ]; then
+  echo "No install directory. Please specify the --branch argument."
+  exit 1
+fi
+
+if [ "$CMAKE_ARGS" == "" ]; then
+  CMAKE_ARGS="-DCMAKE_BUILD_TYPE=RELEASE '-DCMAKE_C_FLAGS=-gline-tables-only' '-DCMAKE_CXX_FLAGS=-gline-tables-only' -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_INSTALL_TOOLCHAIN_ONLY=ON"
+fi
+
+set -x
+
+TMP_ROOT="$(mktemp -d -p /tmp)"
+LLVM_SOURCE_DIR="$TMP_ROOT/llvm-project"
+LLVM_BUILD_DIR="$TMP_ROOT/build"
+LLVM="$LLVM_SOURCE_DIR/llvm"
+
+git clone --branch $LLVM_BRANCH --single-branch --depth=1 https://github.com/llvm/llvm-project.git $LLVM_SOURCE_DIR
+
+pushd "$LLVM_SOURCE_DIR"
+
+# Setup the source-tree using the old style layout
+ln -s $LLVM_SOURCE_DIR/libcxx $LLVM/projects/libcxx
+ln -s $LLVM_SOURCE_DIR/libcxxabi $LLVM/projects/libcxxabi
+ln -s $LLVM_SOURCE_DIR/compiler-rt $LLVM/projects/compiler-rt
+ln -s $LLVM_SOURCE_DIR/clang $LLVM/tools/clang
+ln -s $LLVM_SOURCE_DIR/clang-tools-extra $LLVM/tools/clang/tools/extra
+
+popd
+
+# Configure and build
+mkdir "$LLVM_BUILD_DIR"
+pushd "$LLVM_BUILD_DIR"
+cmake -GNinja "-DCMAKE_INSTALL_PREFIX=$LLVM_INSTALL_DIR" $CMAKE_ARGS $LLVM
+ninja install
+popd
+
+# Cleanup
+rm -rf "$TMP_ROOT/"
+
+echo "Done"
diff --git a/utils/docker/scripts/checkout_git.sh b/utils/docker/scripts/checkout_git.sh
index 222700229..2c5563b43 100755
--- a/utils/docker/scripts/checkout_git.sh
+++ b/utils/docker/scripts/checkout_git.sh
@@ -1,10 +1,9 @@
 #!/usr/bin/env bash
 #===- llvm/utils/docker/scripts/checkout.sh ---------------------===//
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===-----------------------------------------------------------------------===//
 
diff --git a/utils/docker/scripts/install_clang_packages.sh b/utils/docker/scripts/install_clang_packages.sh
index fabee0e81..94c98d6ad 100755
--- a/utils/docker/scripts/install_clang_packages.sh
+++ b/utils/docker/scripts/install_clang_packages.sh
@@ -1,10 +1,9 @@
 #!/usr/bin/env bash
 #===- libcxx/utils/docker/scripts/install_clang_package.sh -----------------===//
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===-----------------------------------------------------------------------===//
 
@@ -21,7 +20,7 @@ Available options:
 EOF
 }
 
-VERSION=""
+VERSION="9"
 
 while [[ $# -gt 0 ]]; do
   case "$1" in
@@ -40,12 +39,29 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
-
+set -x
 
 curl -fsSL https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
 add-apt-repository -s "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs) main"
 apt-get update
-apt-get install -y --no-install-recommends clang
+apt-get upgrade -y
+apt-get install -y --no-install-recommends "clang-$VERSION"
+
+# FIXME(EricWF): Remove this once the clang packages are no longer broken.
+if [ -f "/usr/local/bin/clang" ]; then
+  echo "clang already exists"
+  exit 1
+else
+  CC_BINARY="$(which clang-$VERSION)"
+  ln -s "$CC_BINARY" "/usr/local/bin/clang"
+fi
+if [ -f "/usr/local/bin/clang++" ]; then
+  echo "clang++ already exists"
+  exit 1
+else
+  CXX_BINARY="$(which clang++-$VERSION)"
+  ln -s "$CXX_BINARY" "/usr/local/bin/clang++"
+fi
 
 echo "Testing clang version..."
 clang --version
@@ -59,6 +75,7 @@ if [ "$VERSION" == "" ]; then
   echo "Installing version '$VERSION'"
 fi
 
+apt-get purge -y "libc++-$VERSION-dev" "libc++abi-$VERSION-dev"
 apt-get install -y --no-install-recommends "libc++-$VERSION-dev" "libc++abi-$VERSION-dev"
 
 echo "Done"
diff --git a/utils/docker/scripts/run_buildbot.sh b/utils/docker/scripts/run_buildbot.sh
index 45f5a1cf6..c135fc4af 100755
--- a/utils/docker/scripts/run_buildbot.sh
+++ b/utils/docker/scripts/run_buildbot.sh
@@ -5,9 +5,14 @@ BOT_DIR=/b
 BOT_NAME=$1
 BOT_PASS=$2
 
-mkdir -p $BOT_DIR
+pushd /tmp
+curl -sSO https://dl.google.com/cloudagents/install-monitoring-agent.sh
+bash install-monitoring-agent.sh
+curl -sSO https://dl.google.com/cloudagents/install-logging-agent.sh
+bash install-logging-agent.sh --structured
+popd
 
-#curl "https://repo.stackdriver.com/stack-install.sh" | bash -s -- --write-gcm
+mkdir -p $BOT_DIR
 
 apt-get update -y
 apt-get upgrade -y
@@ -15,9 +20,9 @@ apt-get upgrade -y
 # FIXME(EricWF): Remove this hack. It's only in place to temporarily fix linking libclang_rt from the
 # debian packages.
 # WARNING: If you're not a buildbot, DO NOT RUN!
-apt-get install lld-8
+apt-get install lld-9
 rm /usr/bin/ld
-ln -s /usr/bin/lld-8 /usr/bin/ld
+ln -s /usr/bin/lld-9 /usr/bin/ld
 
 systemctl set-property buildslave.service TasksMax=100000
 
@@ -59,4 +64,4 @@ grep "slave is ready" $BOT_DIR/twistd.log || shutdown now
 # Gracefully restart before that happen.
 sleep 72000
 while pkill -SIGHUP buildslave; do sleep 5; done;
-shutdown now
\ No newline at end of file
+shutdown now
diff --git a/utils/gen_link_script.py b/utils/gen_link_script.py
index 24fe5ce99..79583e567 100755
--- a/utils/gen_link_script.py
+++ b/utils/gen_link_script.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/generate_feature_test_macro_components.py b/utils/generate_feature_test_macro_components.py
new file mode 100755
index 000000000..c11846ec6
--- /dev/null
+++ b/utils/generate_feature_test_macro_components.py
@@ -0,0 +1,976 @@
+#!/usr/bin/env python
+
+import os
+import tempfile
+
+def get_libcxx_paths():
+  utils_path = os.path.dirname(os.path.abspath(__file__))
+  script_name = os.path.basename(__file__)
+  assert os.path.exists(utils_path)
+  src_root = os.path.dirname(utils_path)
+  include_path = os.path.join(src_root, 'include')
+  assert os.path.exists(include_path)
+  docs_path = os.path.join(src_root, 'docs')
+  assert os.path.exists(docs_path)
+  macro_test_path = os.path.join(src_root, 'test', 'std', 'language.support',
+                            'support.limits', 'support.limits.general')
+  assert os.path.exists(macro_test_path)
+  assert os.path.exists(os.path.join(macro_test_path, 'version.version.pass.cpp'))
+  return script_name, src_root, include_path, docs_path, macro_test_path
+
+
+script_name, source_root, include_path, docs_path, macro_test_path = get_libcxx_paths()
+
+def has_header(h):
+  h_path = os.path.join(include_path, h)
+  return os.path.exists(h_path)
+
+def add_version_header(tc):
+    tc["headers"].append("version")
+    return tc
+
+feature_test_macros = sorted([ add_version_header(x) for x in [
+  # C++14 macros
+  {"name": "__cpp_lib_integer_sequence",
+   "values": {
+      "c++14": 201304L
+    },
+    "headers": ["utility"],
+  },
+  {"name": "__cpp_lib_exchange_function",
+   "values": {
+     "c++14": 201304L
+   },
+   "headers": ["utility"],
+  },
+  {"name": "__cpp_lib_tuples_by_type",
+   "values": {
+     "c++14": 201304L
+   },
+   "headers": ["utility", "tuple"],
+  },
+  {"name": "__cpp_lib_tuple_element_t",
+   "values": {
+     "c++14": 201402L
+   },
+   "headers": ["tuple"],
+  },
+  {"name": "__cpp_lib_make_unique",
+   "values": {
+     "c++14": 201304L
+   },
+   "headers": ["memory"],
+  },
+  {"name": "__cpp_lib_transparent_operators",
+   "values": {
+     "c++14": 201210L,
+     "c++17": 201510L,
+   },
+   "headers": ["functional"],
+  },
+  {"name": "__cpp_lib_integral_constant_callable",
+   "values": {
+     "c++14": 201304L
+   },
+   "headers": ["type_traits"],
+  },
+  {"name": "__cpp_lib_transformation_trait_aliases",
+   "values": {
+     "c++14": 201304L,
+   },
+   "headers": ["type_traits"]
+  },
+  {"name": "__cpp_lib_result_of_sfinae",
+   "values": {
+     "c++14": 201210L,
+   },
+   "headers": ["functional", "type_traits"]
+  },
+  {"name": "__cpp_lib_is_final",
+   "values": {
+     "c++14": 201402L,
+   },
+   "headers": ["type_traits"]
+  },
+  {"name": "__cpp_lib_is_null_pointer",
+   "values": {
+     "c++14": 201309L,
+   },
+   "headers": ["type_traits"]
+  },
+  {"name": "__cpp_lib_chrono_udls",
+   "values": {
+     "c++14": 201304L,
+   },
+   "headers": ["chrono"]
+  },
+  {"name": "__cpp_lib_string_udls",
+   "values": {
+     "c++14": 201304L,
+   },
+   "headers": ["string"]
+  },
+  {"name": "__cpp_lib_generic_associative_lookup",
+   "values": {
+     "c++14": 201304L,
+   },
+   "headers": ["map", "set"]
+  },
+  {"name": "__cpp_lib_null_iterators",
+   "values": {
+     "c++14": 201304L,
+   },
+   "headers": ["iterator"]
+  },
+  {"name": "__cpp_lib_make_reverse_iterator",
+   "values": {
+     "c++14": 201402L,
+   },
+   "headers": ["iterator"]
+  },
+  {"name": "__cpp_lib_robust_nonmodifying_seq_ops",
+   "values": {
+     "c++14": 201304L,
+   },
+   "headers": ["algorithm"]
+  },
+  {"name": "__cpp_lib_complex_udls",
+   "values": {
+     "c++14": 201309L,
+   },
+   "headers": ["complex"]
+  },
+  {"name": "__cpp_lib_quoted_string_io",
+   "values": {
+     "c++14": 201304L,
+   },
+   "headers": ["iomanip"]
+  },
+  {"name": "__cpp_lib_shared_timed_mutex",
+   "values": {
+     "c++14": 201402L,
+   },
+   "headers": ["shared_mutex"],
+   "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+   "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+  },
+  # C++17 macros
+  {"name": "__cpp_lib_atomic_is_always_lock_free",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["atomic"],
+   "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+   "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+  },
+  {"name": "__cpp_lib_filesystem",
+   "values": {
+     "c++17": 201703L,
+   },
+   "headers": ["filesystem"]
+  },
+  {"name": "__cpp_lib_invoke",
+   "values": {
+     "c++17": 201411L,
+   },
+   "headers": ["functional"]
+  },
+  {"name": "__cpp_lib_void_t",
+   "values": {
+     "c++17": 201411L,
+   },
+   "headers": ["type_traits"]
+  },
+  {"name": "__cpp_lib_node_extract",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["map", "set", "unordered_map", "unordered_set"]
+  },
+  {"name": "__cpp_lib_byte",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["cstddef"],
+   },
+  {"name": "__cpp_lib_hardware_interference_size",
+   "values": {
+     "c++17": 201703L,
+   },
+   "headers": ["new"],
+   },
+  {"name": "__cpp_lib_launder",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["new"],
+   },
+  {"name": "__cpp_lib_uncaught_exceptions",
+   "values": {
+     "c++17": 201411L,
+   },
+   "headers": ["exception"],
+   },
+  {"name": "__cpp_lib_as_const",
+   "values": {
+     "c++17": 201510L,
+   },
+   "headers": ["utility"],
+   },
+  {"name": "__cpp_lib_make_from_tuple",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["tuple"],
+   },
+  {"name": "__cpp_lib_apply",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["tuple"],
+   },
+  {"name": "__cpp_lib_optional",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["optional"],
+   },
+  {"name": "__cpp_lib_variant",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["variant"],
+   },
+  {"name": "__cpp_lib_any",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["any"],
+   },
+  {"name": "__cpp_lib_addressof_constexpr",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["memory"],
+   "depends": "TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700",
+   "internal_depends": "!defined(_LIBCPP_HAS_NO_BUILTIN_ADDRESSOF)",
+   },
+  {"name": "__cpp_lib_raw_memory_algorithms",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["memory"],
+   },
+  {"name": "__cpp_lib_enable_shared_from_this",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["memory"],
+   },
+  {"name": "__cpp_lib_shared_ptr_weak_type",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["memory"],
+   },
+  {"name": "__cpp_lib_shared_ptr_arrays",
+   "values": {
+     "c++17": 201611L,
+   },
+   "headers": ["memory"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_memory_resource",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["memory_resource"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_boyer_moore_searcher",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["functional"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_not_fn",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["functional"],
+   },
+  {"name": "__cpp_lib_bool_constant",
+   "values": {
+     "c++17": 201505L,
+   },
+   "headers": ["type_traits"],
+   },
+  {"name": "__cpp_lib_type_trait_variable_templates",
+   "values": {
+     "c++17": 201510L,
+   },
+   "headers": ["type_traits"],
+   },
+  {"name": "__cpp_lib_logical_traits",
+   "values": {
+     "c++17": 201510L,
+   },
+   "headers": ["type_traits"],
+   },
+  {"name": "__cpp_lib_is_swappable",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["type_traits"],
+   },
+  {"name": "__cpp_lib_is_invocable",
+   "values": {
+     "c++17": 201703L,
+   },
+   "headers": ["type_traits"],
+   },
+  {"name": "__cpp_lib_has_unique_object_representations",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["type_traits"],
+   "depends": "TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700",
+   "internal_depends": "defined(_LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS)",
+   },
+  {"name": "__cpp_lib_is_aggregate",
+   "values": {
+     "c++17": 201703L,
+   },
+   "headers": ["type_traits"],
+   "depends": "TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001",
+   "internal_depends": "!defined(_LIBCPP_HAS_NO_IS_AGGREGATE)",
+   },
+  {"name": "__cpp_lib_chrono",
+   "values": {
+     "c++17": 201611L,
+   },
+   "headers": ["chrono"],
+   },
+  {"name": "__cpp_lib_execution",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["execution"],
+   "unimplemented": True
+   },
+  {"name": "__cpp_lib_parallel_algorithm",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["algorithm", "numeric"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_to_chars",
+   "values": {
+     "c++17": 201611L,
+   },
+   "headers": ["utility"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_string_view",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["string", "string_view"],
+   },
+  {"name": "__cpp_lib_allocator_traits_is_always_equal",
+   "values": {
+     "c++17": 201411L,
+   },
+   "headers": ["memory", "scoped_allocator", "string", "deque", "forward_list", "list", "vector", "map", "set", "unordered_map", "unordered_set"],
+   },
+  {"name": "__cpp_lib_incomplete_container_elements",
+   "values": {
+     "c++17": 201505L,
+   },
+   "headers": ["forward_list", "list", "vector"],
+   },
+  {"name": "__cpp_lib_map_try_emplace",
+   "values": {
+     "c++17": 201411L,
+   },
+   "headers": ["map"],
+   },
+  {"name": "__cpp_lib_unordered_map_try_emplace",
+   "values": {
+     "c++17": 201411L,
+   },
+   "headers": ["unordered_map"],
+   },
+  {"name": "__cpp_lib_array_constexpr",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["iterator", "array"],
+   },
+  {"name": "__cpp_lib_nonmember_container_access",
+   "values": {
+     "c++17": 201411L,
+   },
+   "headers": ["iterator", "array", "deque", "forward_list", "list", "map", "regex",
+               "set", "string", "unordered_map", "unordered_set", "vector"],
+   },
+  {"name": "__cpp_lib_sample",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["algorithm"],
+   },
+  {"name": "__cpp_lib_clamp",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["algorithm"],
+   },
+  {"name": "__cpp_lib_gcd_lcm",
+   "values": {
+     "c++17": 201606L,
+   },
+   "headers": ["numeric"],
+   },
+  {"name": "__cpp_lib_hypot",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["cmath"],
+   },
+  {"name": "__cpp_lib_math_special_functions",
+   "values": {
+     "c++17": 201603L,
+   },
+   "headers": ["cmath"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_shared_mutex",
+   "values": {
+     "c++17": 201505L,
+   },
+   "headers": ["shared_mutex"],
+   "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+   "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+   },
+  {"name": "__cpp_lib_scoped_lock",
+   "values": {
+     "c++17": 201703L,
+   },
+   "headers": ["mutex"],
+   },
+  # C++2a
+  {"name": "__cpp_lib_char8_t",
+   "values": {
+     "c++2a": 201811L,
+   },
+   "headers": ["atomic", "filesystem", "istream", "limits", "locale", "ostream",
+               "string", "string_view"],
+   "depends": "defined(__cpp_char8_t)",
+   "internal_depends": "!defined(_LIBCPP_NO_HAS_CHAR8_T)",
+   },
+  {"name": "__cpp_lib_erase_if",
+   "values": {
+     "c++2a": 201811L,
+   },
+   "headers": ["string", "deque", "forward_list", "list", "vector", "map",
+               "set", "unordered_map", "unordered_set"]
+  },
+  {"name": "__cpp_lib_destroying_delete",
+   "values": {
+     "c++2a": 201806L,
+   },
+   "headers": ["new"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_three_way_comparison",
+   "values": {
+     "c++2a": 201711L,
+   },
+   "headers": ["compare"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_concepts",
+   "values": {
+     "c++2a": 201806L,
+   },
+   "headers": ["concepts"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_constexpr_swap_algorithms",
+   "values": {
+     "c++2a": 201806L,
+   },
+   "headers": ["algorithm"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_constexpr_misc",
+   "values": {
+     "c++2a": 201811L,
+   },
+   "headers": ["array", "functional", "iterator", "string_view", "tuple", "utility"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_bind_front",
+   "values": {
+     "c++2a": 201811L,
+   },
+   "headers": ["functional"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_is_constant_evaluated",
+   "values": {
+     "c++2a": 201811L,
+   },
+   "headers": ["type_traits"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_list_remove_return_type",
+   "values": {
+     "c++2a": 201806L,
+   },
+   "headers": ["forward_list", "list"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_generic_unordered_lookup",
+   "values": {
+     "c++2a": 201811L,
+   },
+   "headers": ["unordered_map", "unordered_set"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_ranges",
+   "values": {
+     "c++2a": 201811L,
+   },
+   "headers": ["algorithm", "functional", "iterator", "memory", "ranges"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_bit_cast",
+   "values": {
+     "c++2a": 201806L,
+   },
+   "headers": ["bit"],
+   "unimplemented": True,
+   },
+  {"name": "__cpp_lib_atomic_ref",
+   "values": {
+     "c++2a": 201806L,
+   },
+   "headers": ["atomic"],
+   "unimplemented": True,
+   "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+   "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
+   },
+]], key=lambda tc: tc["name"])
+
+def get_std_dialects():
+  std_dialects = ['c++14', 'c++17', 'c++2a']
+  return list(std_dialects)
+
+def get_first_std(d):
+    for s in get_std_dialects():
+        if s in d.keys():
+            return s
+    return None
+
+def get_last_std(d):
+  rev_dialects = get_std_dialects()
+  rev_dialects.reverse()
+  for s in rev_dialects:
+    if s in d.keys():
+      return s
+  return None
+
+def get_std_before(d, std):
+  std_dialects = get_std_dialects()
+  candidates = std_dialects[0:std_dialects.index(std)]
+  candidates.reverse()
+  for cand in candidates:
+    if cand in d.keys():
+      return cand
+  return None
+
+def get_value_before(d, std):
+  new_std = get_std_before(d, std)
+  if new_std is None:
+    return None
+  return d[new_std]
+
+def get_for_std(d, std):
+  # This catches the C++11 case for which there should be no defined feature
+  # test macros.
+  std_dialects = get_std_dialects()
+  if std not in std_dialects:
+    return None
+  # Find the value for the newest C++ dialect between C++14 and std
+  std_list = list(std_dialects[0:std_dialects.index(std)+1])
+  std_list.reverse()
+  for s in std_list:
+    if s in d.keys():
+      return d[s]
+  return None
+
+
+"""
+  Functions to produce the <version> header
+"""
+
+def produce_macros_definition_for_std(std):
+  result = ""
+  indent = 56
+  for tc in feature_test_macros:
+    if std not in tc["values"]:
+      continue
+    inner_indent = 1
+    if 'depends' in tc.keys():
+      assert 'internal_depends' in tc.keys()
+      result += "# if %s\n" % tc["internal_depends"]
+      inner_indent += 2
+    if get_value_before(tc["values"], std) is not None:
+      assert 'depends' not in tc.keys()
+      result += "# undef  %s\n" % tc["name"]
+    line = "#%sdefine %s" % ((" " * inner_indent), tc["name"])
+    line += " " * (indent - len(line))
+    line += "%sL" % tc["values"][std]
+    if 'unimplemented' in tc.keys():
+      line = "// " + line
+    result += line
+    result += "\n"
+    if 'depends' in tc.keys():
+      result += "# endif\n"
+  return result
+
+def chunks(l, n):
+  """Yield successive n-sized chunks from l."""
+  for i in range(0, len(l), n):
+    yield l[i:i + n]
+
+def produce_version_synopsis():
+  indent = 56
+  header_indent = 56 + len("20XXYYL ")
+  result = ""
+  def indent_to(s, val):
+    if len(s) >= val:
+      return s
+    s += " " * (val - len(s))
+    return s
+  line = indent_to("Macro name", indent) + "Value"
+  line = indent_to(line, header_indent) + "Headers"
+  result += line + "\n"
+  for tc in feature_test_macros:
+    prev_defined_std = get_last_std(tc["values"])
+    line = "{name: <{indent}}{value}L ".format(name=tc['name'], indent=indent,
+                                               value=tc["values"][prev_defined_std])
+    headers = list(tc["headers"])
+    headers.remove("version")
+    for chunk in chunks(headers, 3):
+      line = indent_to(line, header_indent)
+      chunk = ['<%s>' % header for header in chunk]
+      line += ' '.join(chunk)
+      result += line
+      result += "\n"
+      line = ""
+    while True:
+      prev_defined_std = get_std_before(tc["values"], prev_defined_std)
+      if prev_defined_std is None:
+        break
+      result += "%s%sL // %s\n" % (indent_to("", indent), tc["values"][prev_defined_std],
+                                prev_defined_std.replace("c++", "C++"))
+  return result
+
+
+def produce_version_header():
+  template="""// -*- C++ -*-
+//===--------------------------- version ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_VERSIONH
+#define _LIBCPP_VERSIONH
+
+/*
+  version synopsis
+
+{synopsis}
+
+*/
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER > 11
+{cxx14_macros}
+#endif
+
+#if _LIBCPP_STD_VER > 14
+{cxx17_macros}
+#endif
+
+#if _LIBCPP_STD_VER > 17
+{cxx2a_macros}
+#endif
+
+#endif // _LIBCPP_VERSIONH
+"""
+  return template.format(
+      synopsis=produce_version_synopsis().strip(),
+      cxx14_macros=produce_macros_definition_for_std('c++14').strip(),
+      cxx17_macros=produce_macros_definition_for_std('c++17').strip(),
+      cxx2a_macros=produce_macros_definition_for_std('c++2a').strip())
+
+"""
+    Functions to produce test files
+"""
+
+test_types = {
+  "undefined": """
+# ifdef {name}
+#   error "{name} should not be defined before {std_first}"
+# endif
+""",
+
+  "depends": """
+# if {depends}
+#   ifndef {name}
+#     error "{name} should be defined in {std}"
+#   endif
+#   if {name} != {value}
+#     error "{name} should have the value {value} in {std}"
+#   endif
+# else
+#   ifdef {name}
+#     error "{name} should not be defined when {depends} is not defined!"
+#   endif
+# endif
+""",
+
+  "unimplemented": """
+# if !defined(_LIBCPP_VERSION)
+#   ifndef {name}
+#     error "{name} should be defined in {std}"
+#   endif
+#   if {name} != {value}
+#     error "{name} should have the value {value} in {std}"
+#   endif
+# else // _LIBCPP_VERSION
+#   ifdef {name}
+#     error "{name} should not be defined because it is unimplemented in libc++!"
+#   endif
+# endif
+""",
+
+  "defined":"""
+# ifndef {name}
+#   error "{name} should be defined in {std}"
+# endif
+# if {name} != {value}
+#   error "{name} should have the value {value} in {std}"
+# endif
+"""
+}
+
+def generate_std_test(test_list, std):
+  result = ""
+  for tc in test_list:
+    val = get_for_std(tc["values"], std)
+    if val is not None:
+      val = "%sL" % val
+    if val is None:
+      result += test_types["undefined"].format(name=tc["name"], std_first=get_first_std(tc["values"]))
+    elif 'unimplemented' in tc.keys():
+      result += test_types["unimplemented"].format(name=tc["name"], value=val, std=std)
+    elif "depends" in tc.keys():
+      result += test_types["depends"].format(name=tc["name"], value=val, std=std, depends=tc["depends"])
+    else:
+      result +=  test_types["defined"].format(name=tc["name"], value=val, std=std)
+  return result
+
+def generate_synopsis(test_list):
+    max_name_len = max([len(tc["name"]) for tc in test_list])
+    indent = max_name_len + 8
+    def mk_line(prefix, suffix):
+        return "{prefix: <{max_len}}{suffix}\n".format(prefix=prefix, suffix=suffix,
+        max_len=indent)
+    result = ""
+    result += mk_line("/*  Constant", "Value")
+    for tc in test_list:
+        prefix = "    %s" % tc["name"]
+        for std in [s for s in get_std_dialects() if s in tc["values"].keys()]:
+            result += mk_line(prefix, "%sL [%s]" % (tc["values"][std], std.replace("c++", "C++")))
+            prefix = ""
+    result += "*/"
+    return result
+
+def is_threading_header_unsafe_to_include(h):
+  # NOTE: "<mutex>" does not blow up when included without threads.
+  return h in ['atomic', 'shared_mutex']
+
+def produce_tests():
+  headers = set([h for tc in feature_test_macros for h in tc["headers"]])
+  for h in headers:
+    test_list = [tc for tc in feature_test_macros if h in tc["headers"]]
+    if not has_header(h):
+      for tc in test_list:
+        assert 'unimplemented' in tc.keys()
+      continue
+    test_tags = ""
+    if is_threading_header_unsafe_to_include(h):
+      test_tags += '\n// UNSUPPORTED: libcpp-has-no-threads\n'
+    test_body = \
+"""//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// WARNING: This test was generated by {script_name}
+// and should not be edited manually.
+{test_tags}
+// <{header}>
+
+// Test the feature test macros defined by <{header}>
+
+{synopsis}
+
+#include <{header}>
+#include "test_macros.h"
+
+#if TEST_STD_VER < 14
+
+{cxx11_tests}
+
+#elif TEST_STD_VER == 14
+
+{cxx14_tests}
+
+#elif TEST_STD_VER == 17
+
+{cxx17_tests}
+
+#elif TEST_STD_VER > 17
+
+{cxx2a_tests}
+
+#endif // TEST_STD_VER > 17
+
+int main(int, char**) {{ return 0; }}
+""".format(script_name=script_name,
+           header=h,
+           test_tags=test_tags,
+           synopsis=generate_synopsis(test_list),
+           cxx11_tests=generate_std_test(test_list, 'c++11').strip(),
+           cxx14_tests=generate_std_test(test_list, 'c++14').strip(),
+           cxx17_tests=generate_std_test(test_list, 'c++17').strip(),
+           cxx2a_tests=generate_std_test(test_list, 'c++2a').strip())
+    test_name = "{header}.version.pass.cpp".format(header=h)
+    out_path = os.path.join(macro_test_path, test_name)
+    with open(out_path, 'w') as f:
+      f.write(test_body)
+
+"""
+    Produce documentation for the feature test macros
+"""
+
+def make_widths(grid):
+  widths = []
+  for i in range(0, len(grid[0])):
+    cell_width = 2 + max(reduce(lambda x,y: x+y, [[len(row[i])] for row in grid], []))
+    widths += [cell_width]
+  return widths
+
+def create_table(grid, indent):
+  indent_str = ' '*indent
+  col_widths = make_widths(grid)
+  num_cols = len(grid[0])
+  result = indent_str + add_divider(col_widths, 2)
+  header_flag = 2
+  for row_i in xrange(0, len(grid)):
+    row = grid[row_i]
+    result = result + indent_str + ' '.join([pad_cell(row[i], col_widths[i]) for i in range(0, len(row))]) + '\n'
+    is_cxx_header = row[0].startswith('**')
+    if row_i == len(grid) - 1:
+      header_flag = 2
+    result = result + indent_str + add_divider(col_widths, 1 if is_cxx_header else header_flag)
+    header_flag = 0
+  return result
+
+def add_divider(widths, header_flag):
+  if header_flag == 2:
+    return ' '.join(['='*w for w in widths]) + '\n'
+  if header_flag == 1:
+    return '-'.join(['-'*w for w in widths]) + '\n'
+  else:
+    return ' '.join(['-'*w for w in widths]) + '\n'
+
+def pad_cell(s, length, left_align=True):
+  padding = ((length - len(s)) * ' ')
+  return s + padding
+
+
+def get_status_table():
+  table = [["Macro Name", "Value"]]
+  for std in get_std_dialects():
+    table += [["**" + std.replace("c++", "C++ ") + "**", ""]]
+    for tc in feature_test_macros:
+      if std not in tc["values"].keys():
+        continue
+      value = "``%sL``" % tc["values"][std]
+      if 'unimplemented' in tc.keys():
+        value = '*unimplemented*'
+      table += [["``%s``" % tc["name"], value]]
+  return table
+
+def produce_docs():
+  doc_str = """.. _FeatureTestMacroTable:
+
+==========================
+Feature Test Macro Support
+==========================
+
+.. contents::
+   :local:
+
+Overview
+========
+
+This file documents the feature test macros currently supported by libc++.
+
+.. _feature-status:
+
+Status
+======
+
+.. table:: Current Status
+     :name: feature-status-table
+     :widths: auto
+     
+{status_tables}
+
+""".format(status_tables=create_table(get_status_table(), 4))
+
+  table_doc_path = os.path.join(docs_path, 'FeatureTestMacroTable.rst')
+  with open(table_doc_path, 'w') as f:
+    f.write(doc_str)
+
+def main():
+  with tempfile.NamedTemporaryFile(mode='w', prefix='version.', delete=False) as tmp_file:
+    print("producing new <version> header as %s" % tmp_file.name)
+    tmp_file.write(produce_version_header())
+  produce_tests()
+  produce_docs()
+
+
+if __name__ == '__main__':
+  main()
diff --git a/utils/libcxx/__init__.py b/utils/libcxx/__init__.py
index 7523a3d8b..d2e99bae3 100644
--- a/utils/libcxx/__init__.py
+++ b/utils/libcxx/__init__.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/libcxx/compiler.py b/utils/libcxx/compiler.py
index 70022d7a4..a553dbf60 100644
--- a/utils/libcxx/compiler.py
+++ b/utils/libcxx/compiler.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/libcxx/sym_check/__init__.py b/utils/libcxx/sym_check/__init__.py
index 1aa2b450c..0766df2ea 100644
--- a/utils/libcxx/sym_check/__init__.py
+++ b/utils/libcxx/sym_check/__init__.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/libcxx/sym_check/diff.py b/utils/libcxx/sym_check/diff.py
index 0821ef6f7..fdd77a9d4 100644
--- a/utils/libcxx/sym_check/diff.py
+++ b/utils/libcxx/sym_check/diff.py
@@ -1,10 +1,9 @@
 # -*- Python -*- vim: set syntax=python tabstop=4 expandtab cc=80:
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 """
diff --git a/utils/libcxx/sym_check/extract.py b/utils/libcxx/sym_check/extract.py
index 152ff97db..6089ec234 100644
--- a/utils/libcxx/sym_check/extract.py
+++ b/utils/libcxx/sym_check/extract.py
@@ -1,16 +1,16 @@
 # -*- Python -*- vim: set syntax=python tabstop=4 expandtab cc=80:
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 """
 extract - A set of function that extract symbol lists from shared libraries.
 """
 import distutils.spawn
+import os.path
 import sys
 import re
 
@@ -31,7 +31,7 @@ class NMExtractor(object):
         """
         return distutils.spawn.find_executable('nm')
 
-    def __init__(self):
+    def __init__(self, static_lib):
         """
         Initialize the nm executable and flags that will be used to extract
         symbols from shared libraries.
@@ -41,8 +41,10 @@ class NMExtractor(object):
             # ERROR no NM found
             print("ERROR: Could not find nm")
             sys.exit(1)
+        self.static_lib = static_lib
         self.flags = ['-P', '-g']
 
+
     def extract(self, lib):
         """
         Extract symbols from a library and return the results as a dict of
@@ -54,7 +56,7 @@ class NMExtractor(object):
             raise RuntimeError('Failed to run %s on %s' % (self.nm_exe, lib))
         fmt_syms = (self._extract_sym(l)
                     for l in out.splitlines() if l.strip())
-            # Cast symbol to string.
+        # Cast symbol to string.
         final_syms = (repr(s) for s in fmt_syms if self._want_sym(s))
         # Make unique and sort strings.
         tmp_list = list(sorted(set(final_syms)))
@@ -117,7 +119,7 @@ class ReadElfExtractor(object):
         """
         return distutils.spawn.find_executable('readelf')
 
-    def __init__(self):
+    def __init__(self, static_lib):
         """
         Initialize the readelf executable and flags that will be used to
         extract symbols from shared libraries.
@@ -127,6 +129,8 @@ class ReadElfExtractor(object):
             # ERROR no NM found
             print("ERROR: Could not find readelf")
             sys.exit(1)
+        # TODO: Support readelf for reading symbols from archives
+        assert not static_lib and "RealElf does not yet support static libs"
         self.flags = ['--wide', '--symbols']
 
     def extract(self, lib):
@@ -181,14 +185,17 @@ class ReadElfExtractor(object):
         return lines[start:end]
 
 
-def extract_symbols(lib_file):
+def extract_symbols(lib_file, static_lib=None):
     """
-    Extract and return a list of symbols extracted from a dynamic library.
-    The symbols are extracted using NM. They are then filtered and formated.
-    Finally they symbols are made unique.
+    Extract and return a list of symbols extracted from a static or dynamic
+    library. The symbols are extracted using NM or readelf. They are then
+    filtered and formated. Finally they symbols are made unique.
     """
-    if ReadElfExtractor.find_tool():
-        extractor = ReadElfExtractor()
+    if static_lib is None:
+        _, ext = os.path.splitext(lib_file)
+        static_lib = True if ext in ['.a'] else False
+    if ReadElfExtractor.find_tool() and not static_lib:
+        extractor = ReadElfExtractor(static_lib=static_lib)
     else:
-        extractor = NMExtractor()
+        extractor = NMExtractor(static_lib=static_lib)
     return extractor.extract(lib_file)
diff --git a/utils/libcxx/sym_check/match.py b/utils/libcxx/sym_check/match.py
index fae400e4e..636e3ab6e 100644
--- a/utils/libcxx/sym_check/match.py
+++ b/utils/libcxx/sym_check/match.py
@@ -1,10 +1,9 @@
 # -*- Python -*- vim: set syntax=python tabstop=4 expandtab cc=80:
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 """
diff --git a/utils/libcxx/sym_check/util.py b/utils/libcxx/sym_check/util.py
index 8a4c4ab49..0ebde9034 100644
--- a/utils/libcxx/sym_check/util.py
+++ b/utils/libcxx/sym_check/util.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
@@ -12,6 +11,7 @@ import distutils.spawn
 import sys
 import re
 import libcxx.util
+from pprint import pformat
 
 
 def read_syms_from_list(slist):
@@ -39,17 +39,20 @@ def read_blacklist(filename):
     return lines
 
 
-def write_syms(sym_list, out=None, names_only=False):
+def write_syms(sym_list, out=None, names_only=False, filter=None):
     """
     Write a list of symbols to the file named by out.
     """
     out_str = ''
     out_list = sym_list
     out_list.sort(key=lambda x: x['name'])
+    if filter is not None:
+        out_list = filter(out_list)
     if names_only:
-        out_list = [sym['name'] for sym in sym_list]
+        out_list = [sym['name'] for sym in out_list]
     for sym in out_list:
-        out_str += '%s\n' % sym
+        # Use pformat for consistent ordering of keys.
+        out_str += pformat(sym, width=100000) + '\n'
     if out is None:
         sys.stdout.write(out_str)
     else:
@@ -241,10 +244,11 @@ cxxabi_symbols = [
     '_ZTSy'
 ]
 
-def is_stdlib_symbol_name(name):
+def is_stdlib_symbol_name(name, sym):
     name = adjust_mangled_name(name)
     if re.search("@GLIBC|@GCC", name):
-        return False
+        # Only when symbol is defined do we consider it ours
+        return sym['is_defined']
     if re.search('(St[0-9])|(__cxa)|(__cxxabi)', name):
         return True
     if name in new_delete_std_symbols:
@@ -260,8 +264,7 @@ def filter_stdlib_symbols(syms):
     other_symbols = []
     for s in syms:
         canon_name = adjust_mangled_name(s['name'])
-        if not is_stdlib_symbol_name(canon_name):
-            assert not s['is_defined'] and "found defined non-std symbol"
+        if not is_stdlib_symbol_name(canon_name, s):
             other_symbols += [s]
         else:
             stdlib_symbols += [s]
diff --git a/utils/libcxx/test/config.py b/utils/libcxx/test/config.py
index 1aa52ddbb..c619086b6 100644
--- a/utils/libcxx/test/config.py
+++ b/utils/libcxx/test/config.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
@@ -282,9 +281,15 @@ class Configuration(object):
         self.project_obj_root = self.get_lit_conf('project_obj_root')
         self.libcxx_obj_root = self.get_lit_conf('libcxx_obj_root')
         if not self.libcxx_obj_root and self.project_obj_root is not None:
-            possible_root = os.path.join(self.project_obj_root, 'projects', 'libcxx')
-            if os.path.isdir(possible_root):
-                self.libcxx_obj_root = possible_root
+            possible_roots = [
+                os.path.join(self.project_obj_root, 'libcxx'),
+                os.path.join(self.project_obj_root, 'projects', 'libcxx'),
+                os.path.join(self.project_obj_root, 'runtimes', 'libcxx'),
+            ]
+            for possible_root in possible_roots:
+                if os.path.isdir(possible_root):
+                    self.libcxx_obj_root = possible_root
+                    break
             else:
                 self.libcxx_obj_root = self.project_obj_root
 
@@ -548,10 +553,10 @@ class Configuration(object):
         self.cxx.flags += ['-v']
         sysroot = self.get_lit_conf('sysroot')
         if sysroot:
-            self.cxx.flags += ['--sysroot', sysroot]
+            self.cxx.flags += ['--sysroot=' + sysroot]
         gcc_toolchain = self.get_lit_conf('gcc_toolchain')
         if gcc_toolchain:
-            self.cxx.flags += ['-gcc-toolchain', gcc_toolchain]
+            self.cxx.flags += ['--gcc-toolchain=' + gcc_toolchain]
         # NOTE: the _DEBUG definition must preceed the triple check because for
         # the Windows build of libc++, the forced inclusion of a header requires
         # that _DEBUG is defined.  Incorrect ordering will result in -target
@@ -560,8 +565,8 @@ class Configuration(object):
             self.cxx.compile_flags += ['-D_DEBUG']
         if self.use_target:
             if not self.cxx.addFlagIfSupported(
-                    ['-target', self.config.target_triple]):
-                self.lit_config.warning('use_target is true but -target is '\
+                    ['--target=' + self.config.target_triple]):
+                self.lit_config.warning('use_target is true but --target is '\
                         'not supported by the compiler')
         if self.use_deployment:
             arch, name, version = self.config.deployment
@@ -1144,6 +1149,18 @@ class Configuration(object):
         self.lit_config.note(
             "computed target_triple as: %r" % self.config.target_triple)
 
+        # Throwing bad_optional_access, bad_variant_access and bad_any_cast is
+        # supported starting in macosx10.14.
+        if name == 'macosx' and version in ('10.%s' % v for v in range(7, 14)):
+            self.config.available_features.add('dylib-has-no-bad_optional_access')
+            self.lit_config.note("throwing bad_optional_access is not supported by the deployment target")
+
+            self.config.available_features.add('dylib-has-no-bad_variant_access')
+            self.lit_config.note("throwing bad_variant_access is not supported by the deployment target")
+
+            self.config.available_features.add('dylib-has-no-bad_any_cast')
+            self.lit_config.note("throwing bad_any_cast is not supported by the deployment target")
+
     def configure_env(self):
         self.target_info.configure_env(self.exec_env)
 
diff --git a/utils/libcxx/test/executor.py b/utils/libcxx/test/executor.py
index 0ccf96caa..607c9384b 100644
--- a/utils/libcxx/test/executor.py
+++ b/utils/libcxx/test/executor.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/libcxx/test/format.py b/utils/libcxx/test/format.py
index 6a334ac31..a8dae4898 100644
--- a/utils/libcxx/test/format.py
+++ b/utils/libcxx/test/format.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/libcxx/test/target_info.py b/utils/libcxx/test/target_info.py
index 32bbb2e11..2ea24d62e 100644
--- a/utils/libcxx/test/target_info.py
+++ b/utils/libcxx/test/target_info.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===//
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===//
 
@@ -252,8 +251,10 @@ class LinuxLocalTI(DefaultTargetInfo):
             flags += ['-lunwind', '-ldl']
         else:
             flags += ['-lgcc_s']
-        compiler_rt = self.full_config.get_lit_bool('compiler_rt', False)
-        if not compiler_rt:
+        builtins_lib = self.full_config.get_lit_conf('builtins_library')
+        if builtins_lib:
+            flags += [builtins_lib]
+        else:
             flags += ['-lgcc']
         use_libatomic = self.full_config.get_lit_bool('use_libatomic', False)
         if use_libatomic:
diff --git a/utils/libcxx/test/tracing.py b/utils/libcxx/test/tracing.py
index c590ba3ef..9ef9ae350 100644
--- a/utils/libcxx/test/tracing.py
+++ b/utils/libcxx/test/tracing.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/libcxx/util.py b/utils/libcxx/util.py
index ecfb9afb7..46c09bf66 100644
--- a/utils/libcxx/util.py
+++ b/utils/libcxx/util.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/merge_archives.py b/utils/merge_archives.py
index 58d92f0e2..e57afab20 100755
--- a/utils/merge_archives.py
+++ b/utils/merge_archives.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
@@ -79,6 +78,7 @@ def execute_command_verbose(cmd, cwd=None, verbose=False):
         sys.stderr.write('%s\n' % report)
         if exitCode != 0:
             exit_with_cleanups(exitCode)
+    return out
 
 def main():
     parser = ArgumentParser(
@@ -120,15 +120,15 @@ def main():
     global temp_directory_root
     temp_directory_root = tempfile.mkdtemp('.libcxx.merge.archives')
 
+    files = []
     for arc in archives:
-        execute_command_verbose([ar_exe, 'x', arc], cwd=temp_directory_root,
-                                verbose=args.verbose)
-
-    files = glob.glob(os.path.join(temp_directory_root, '*.o*'))
-    if not files:
-        print_and_exit('Failed to glob for %s' % temp_directory_root)
-    cmd = [ar_exe, 'qcs', args.output] + files
-    execute_command_verbose(cmd, cwd=temp_directory_root, verbose=args.verbose)
+        execute_command_verbose([ar_exe, 'x', arc],
+                                cwd=temp_directory_root, verbose=args.verbose)
+        out = execute_command_verbose([ar_exe, 't', arc])
+        files.extend(out.splitlines())
+
+    execute_command_verbose([ar_exe, 'rcsD', args.output] + files,
+                            cwd=temp_directory_root, verbose=args.verbose)
 
 
 if __name__ == '__main__':
diff --git a/utils/not.py b/utils/not.py
index d9ceb8515..2ebf5088d 100644
--- a/utils/not.py
+++ b/utils/not.py
@@ -1,9 +1,8 @@
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/utils/sym_diff.py b/utils/sym_diff.py
index c01f71c92..6bd1b57e0 100755
--- a/utils/sym_diff.py
+++ b/utils/sym_diff.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 """
diff --git a/utils/sym_extract.py b/utils/sym_extract.py
index 0d9d2eeb8..987c207c1 100755
--- a/utils/sym_extract.py
+++ b/utils/sym_extract.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 """
@@ -28,14 +27,27 @@ def main():
     parser.add_argument('--only-stdlib-symbols', dest='only_stdlib',
                         help="Filter all symbols not related to the stdlib",
                         action='store_true', default=False)
+    parser.add_argument('--defined-only', dest='defined_only',
+                        help="Filter all symbols that are not defined",
+                        action='store_true', default=False)
+    parser.add_argument('--undefined-only', dest='undefined_only',
+                        help="Filter all symbols that are defined",
+                        action='store_true', default=False)
+
     args = parser.parse_args()
+    assert not (args.undefined_only and args.defined_only)
     if args.output is not None:
         print('Extracting symbols from %s to %s.'
               % (args.library, args.output))
     syms = extract.extract_symbols(args.library)
     if args.only_stdlib:
         syms, other_syms = util.filter_stdlib_symbols(syms)
-    util.write_syms(syms, out=args.output, names_only=args.names_only)
+    filter = lambda x: x
+    if args.defined_only:
+      filter = lambda l: list([x for x in l if x['is_defined']])
+    if args.undefined_only:
+      filter = lambda l: list([x for x in l if not x['is_defined']])
+    util.write_syms(syms, out=args.output, names_only=args.names_only, filter=filter)
 
 
 if __name__ == '__main__':
diff --git a/utils/sym_match.py b/utils/sym_match.py
index 48582ce66..1fd39ca5f 100755
--- a/utils/sym_match.py
+++ b/utils/sym_match.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python
 #===----------------------------------------------------------------------===##
 #
-#                     The LLVM Compiler Infrastructure
-#
-# This file is dual licensed under the MIT and the University of Illinois Open
-# Source Licenses. See LICENSE.TXT for details.
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
 
diff --git a/www/TS_deprecation.html b/www/TS_deprecation.html
index a8dd8c183..f3c002fe4 100644
--- a/www/TS_deprecation.html
+++ b/www/TS_deprecation.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/atomic_design.html b/www/atomic_design.html
index 1c6627aad..30fb6feeb 100644
--- a/www/atomic_design.html
+++ b/www/atomic_design.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/atomic_design_a.html b/www/atomic_design_a.html
index 589ca83c1..d3e687f0d 100644
--- a/www/atomic_design_a.html
+++ b/www/atomic_design_a.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/atomic_design_b.html b/www/atomic_design_b.html
index 7f81f8b7c..e07eb8698 100644
--- a/www/atomic_design_b.html
+++ b/www/atomic_design_b.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/atomic_design_c.html b/www/atomic_design_c.html
index 82cc80f7f..936ee6588 100644
--- a/www/atomic_design_c.html
+++ b/www/atomic_design_c.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/cxx1y_status.html b/www/cxx1y_status.html
index 0af6352e9..7c62dc5ec 100644
--- a/www/cxx1y_status.html
+++ b/www/cxx1y_status.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/cxx1z_status.html b/www/cxx1z_status.html
index c2c6f7b02..823c37b58 100644
--- a/www/cxx1z_status.html
+++ b/www/cxx1z_status.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/cxx2a_status.html b/www/cxx2a_status.html
index 581191c76..36bc659c9 100644
--- a/www/cxx2a_status.html
+++ b/www/cxx2a_status.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
@@ -115,7 +114,7 @@
 	<tr><td><a href="https://wg21.link/P0487R1">P0487R1</a></td><td>LWG</td><td>Fixing operator&gt;&gt;(basic_istream&amp;, CharT*) (LWG 2499)</td><td>San Diego</td><td>Complete</td><td>8.0</td></tr>
 	<tr><td><a href="https://wg21.link/P0591R4">P0591R4</a></td><td>LWG</td><td>Utility functions to implement uses-allocator construction</td><td>San Diego</td><td><i> </i></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/P0595R2">P0595R2</a></td><td>CWG</td><td>P0595R2 std::is_constant_evaluated()</td><td>San Diego</td><td><i> </i></td><td></td></tr>
-	<tr><td><a href="https://wg21.link/P0602R4">P0602R4</a></td><td>LWG</td><td>variant and optional should propagate copy/move triviality</td><td>San Diego</td><td><i> </i></td><td></td></tr>
+	<tr><td><a href="https://wg21.link/P0602R4">P0602R4</a></td><td>LWG</td><td>variant and optional should propagate copy/move triviality</td><td>San Diego</td><td>Complete</td><td>8.0</td></tr>
 	<tr><td><a href="https://wg21.link/P0608R3">P0608R3</a></td><td>LWG</td><td>A sane variant converting constructor</td><td>San Diego</td><td><i> </i></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/P0655R1">P0655R1</a></td><td>LWG</td><td>visit&lt;R&gt;: Explicit Return Type for visit</td><td>San Diego</td><td><i> </i></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/P0771R1">P0771R1</a></td><td>LWG</td><td>std::function move constructor should be noexcept</td><td>San Diego</td><td>Complete</td><td>6.0</td></tr>
@@ -255,11 +254,11 @@
 	<tr><td><a href="https://wg21.link/LWG2184">2184</a></td><td>Muddled allocator requirements for <tt>match_results</tt> assignments</td><td>San Diego</td><td>Complete</td></tr>
 	<tr><td><a href="https://wg21.link/LWG2412">2412</a></td><td><tt>promise::set_value()</tt> and <tt>promise::get_future()</tt> should not race</td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG2499">2499</a></td><td><tt>operator&gt;&gt;(basic_istream&amp;, CharT*)</tt> makes it hard to avoid buffer overflows</td><td>San Diego</td><td>Resolved by P0487R1</td></tr>
-	<tr><td><a href="https://wg21.link/LWG2682">2682</a></td><td><code>filesystem::copy()</code> won't create a symlink to a directory</td><td>San Diego</td><td></td></tr>
+	<tr><td><a href="https://wg21.link/LWG2682">2682</a></td><td><code>filesystem::copy()</code> won't create a symlink to a directory</td><td>San Diego</td><td>Nothing to do</td></tr>
 	<tr><td><a href="https://wg21.link/LWG2697">2697</a></td><td>[concurr.ts] Behavior of <tt>future/shared_future</tt> unwrapping constructor when given an invalid <tt>future</tt></td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG2797">2797</a></td><td>Trait precondition violations</td><td>San Diego</td><td>Resolved by 1285R0</td></tr>
-	<tr><td><a href="https://wg21.link/LWG2936">2936</a></td><td>Path comparison is defined in terms of the generic format</td><td>San Diego</td><td></td></tr>
-	<tr><td><a href="https://wg21.link/LWG2943">2943</a></td><td>Problematic specification of the wide version of <tt>basic_filebuf::open</tt></td><td>San Diego</td><td></td></tr>
+	<tr><td><a href="https://wg21.link/LWG2936">2936</a></td><td>Path comparison is defined in terms of the generic format</td><td>San Diego</td><td>Complete</td></tr>
+	<tr><td><a href="https://wg21.link/LWG2943">2943</a></td><td>Problematic specification of the wide version of <tt>basic_filebuf::open</tt></td><td>San Diego</td><td>Nothing to do</td></tr>
 	<tr><td><a href="https://wg21.link/LWG2960">2960</a></td><td>[fund.ts.v3] <tt>nonesuch</tt> is insufficiently useless</td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG2995">2995</a></td><td><tt>basic_stringbuf</tt> default constructor forbids it from using SSO capacity</td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG2996">2996</a></td><td>Missing rvalue overloads for <tt>shared_ptr</tt> operations</td><td>San Diego</td><td></td></tr>
@@ -270,8 +269,8 @@
 	<tr><td><a href="https://wg21.link/LWG3037">3037</a></td><td><tt>polymorphic_allocator</tt> and incomplete types</td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG3038">3038</a></td><td><tt>polymorphic_allocator::allocate</tt> should not allow integer overflow to create vulnerabilities</td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG3054">3054</a></td><td><tt>uninitialized_copy</tt> appears to not be able to meet its exception-safety guarantee</td><td>San Diego</td><td></td></tr>
-	<tr><td><a href="https://wg21.link/LWG3065">3065</a></td><td>LWG 2989 missed that all <tt>path</tt>'s other operators should be hidden friends as well</td><td>San Diego</td><td></td></tr>
-	<tr><td><a href="https://wg21.link/LWG3096">3096</a></td><td><tt>path::lexically_relative</tt> is confused by trailing slashes</td><td>San Diego</td><td></td></tr>
+	<tr><td><a href="https://wg21.link/LWG3065">3065</a></td><td>LWG 2989 missed that all <tt>path</tt>'s other operators should be hidden friends as well</td><td>San Diego</td><td>Complete</td></tr>
+	<tr><td><a href="https://wg21.link/LWG3096">3096</a></td><td><tt>path::lexically_relative</tt> is confused by trailing slashes</td><td>San Diego</td><td>Complete</td></tr>
 	<tr><td><a href="https://wg21.link/LWG3116">3116</a></td><td><tt><i>OUTERMOST_ALLOC_TRAITS</i></tt> needs <tt>remove_reference_t</tt></td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG3122">3122</a></td><td><tt>__cpp_lib_chrono_udls</tt> was accidentally dropped</td><td>San Diego</td><td><i>We've already made the update; but we don't support all the test macros. When we do, this will be closed</i></td></tr>
 	<tr><td><a href="https://wg21.link/LWG3127">3127</a></td><td><tt>basic_osyncstream::rdbuf</tt> needs a <tt>const_cast</tt></td><td>San Diego</td><td></td></tr>
@@ -282,7 +281,7 @@
 	<tr><td><a href="https://wg21.link/LWG3132">3132</a></td><td>Library needs to ban macros named <tt>expects</tt> or <tt>ensures</tt></td><td>San Diego</td><td><i>Nothing to do</i></td></tr>
 	<tr><td><a href="https://wg21.link/LWG3134">3134</a></td><td>[fund.ts.v3] LFTSv3 contains extraneous [meta] variable templates that should have been deleted by P09961</td><td>San Diego</td><td>Resolved by P1210R0</td></tr>
 	<tr><td><a href="https://wg21.link/LWG3137">3137</a></td><td>Header for <tt>__cpp_lib_to_chars</tt></td><td>San Diego</td><td><i>We've already made the update; but we don't support all the test macros. When we do, this will be closed</i></td></tr>
-	<tr><td><a href="https://wg21.link/LWG3145">3145</a></td><td><tt>file_clock</tt> breaks ABI for C++17 implementations</td><td>San Diego</td><td></td></tr>
+	<tr><td><a href="https://wg21.link/LWG3145">3145</a></td><td><tt>file_clock</tt> breaks ABI for C++17 implementations</td><td>San Diego</td><td>Complete</td></tr>
 	<tr><td><a href="https://wg21.link/LWG3147">3147</a></td><td>Definitions of "likely" and "unlikely" are likely to cause problems</td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG3148">3148</a></td><td><tt>&lt;concepts&gt;</tt> should be freestanding</td><td>San Diego</td><td></td></tr>
 	<tr><td><a href="https://wg21.link/LWG3153">3153</a></td><td><tt>Common</tt> and <tt>common_type</tt> have too little in common</td><td>San Diego</td><td></td></tr>
diff --git a/www/index.html b/www/index.html
index 3724b8b43..c707bc18b 100644
--- a/www/index.html
+++ b/www/index.html
@@ -26,8 +26,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/libcxx-dev">libcxx-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/libcxx-commits">libcxx-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/ts1z_status.html b/www/ts1z_status.html
index 22ad0d450..1c2e3a244 100644
--- a/www/ts1z_status.html
+++ b/www/ts1z_status.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/type_traits_design.html b/www/type_traits_design.html
index 1cab2936d..3b3355f2f 100644
--- a/www/type_traits_design.html
+++ b/www/type_traits_design.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
diff --git a/www/upcoming_meeting.html b/www/upcoming_meeting.html
index 0b88d1c66..801a92b22 100644
--- a/www/upcoming_meeting.html
+++ b/www/upcoming_meeting.html
@@ -25,8 +25,7 @@
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev</a>
     <a href="https://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits</a>
     <a href="https://bugs.llvm.org/">Bug Reports</a>
-    <a href="https://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
-    <a href="https://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
   </div>
 </div>
 
@@ -49,6 +48,7 @@
   <h3>Paper Status</h3>
 	<table border="1">
 	<tr><th>Paper #</th><th>Group</th><th>Paper Name</th><th>Meeting</th><th>Status</th></tr>
+<!-- 
 	<tr><td><a href="https://wg21.link/P0487R0">P0487R0</a></td><td>LWG</td><td>Fixing operator&gt;&gt; (basic_istream&amp;, CharT*) (LWG 2499)</td><td>San Diego</td><td><i> </i></td></tr>
 	<tr><td><a href="https://wg21.link/P0602R3">P0602R3</a></td><td>LWG</td><td>variant and optional should propagate copy/move triviality</td><td>San Diego</td><td><i> </i></td></tr>
 	<tr><td><a href="https://wg21.link/P0655R0">P0655R0</a></td><td>LWG</td><td>visit&lt;R&gt;: Explicit Return Type for visit</td><td>San Diego</td><td><i> </i></td></tr>
@@ -58,6 +58,7 @@
 	<tr><td><a href="https://wg21.link/P1032R0">P1032R0</a></td><td>LWG</td><td>Misc constexpr bits</td><td>San Diego</td><td><i> </i></td></tr>
 	<tr><td><a href="http://wiki.edg.com/pub/LWGBatavia2018/LibraryWorkingGroup/D1148R0a.pdf">D1148</a></td><td>LWG</td><td>Cleaning up Clause 20</td><td>San Diego</td><td><i> </i></td></tr>
 	<tr><td><a href="http://wiki.edg.com/pub/LWGBatavia2018/LibraryWorkingGroup/D1163R0V2.pdf">D1163</a></td><td>LWG</td><td>Explicitly Implicifying explicit Constructors</td><td>San Diego</td><td><i> </i></td></tr>
+ -->
 	</table>
 
 
@@ -65,39 +66,22 @@
   <table id="issues" border="1">
 	<tr><th>Issue #</th><th>Issue Name</th><th>Meeting</th><th>Status</th></tr>
 
-<tr><td><a href="https://wg21.link/LWG2183">2183</a></td><td>Muddled allocator requirements for <tt>match_results</tt> constructors</td><td>San Diego</td><td>Complete</td></tr>
-<tr><td><a href="https://wg21.link/LWG2184">2184</a></td><td>Muddled allocator requirements for <tt>match_results</tt> assignments</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG2412">2412</a></td><td><tt>promise::set_value()</tt> and <tt>promise::get_future()</tt> should not race</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG2682">2682</a></td><td><code>filesystem::copy()</code> won't create a symlink to a directory</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG2697">2697</a></td><td>[concurr.ts] Behavior of <tt>future/shared_future</tt> unwrapping constructor when given an invalid <tt>future</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG2936">2936</a></td><td>Path comparison is defined in terms of the generic format</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG2943">2943</a></td><td>Problematic specification of the wide version of <tt>basic_filebuf::open</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG2960">2960</a></td><td>[fund.ts.v3] <tt>nonesuch</tt> is insufficiently useless</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG2995">2995</a></td><td><tt>basic_stringbuf</tt> default constructor forbids it from using SSO capacity</td><td>San Diego</td><td><i>We know how to do this</i></td></tr>
-<tr><td><a href="https://wg21.link/LWG2996">2996</a></td><td>Missing rvalue overloads for <tt>shared_ptr</tt> operations</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3008">3008</a></td><td><tt>make_shared</tt> (sub)object destruction semantics are not specified</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3025">3025</a></td><td>Map-like container deduction guides should use <tt>pair&lt;Key, T&gt;</tt>, not <tt>pair&lt;const Key, T&gt;</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3031">3031</a></td><td>Algorithms and predicates with non-const reference arguments</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3037">3037</a></td><td><tt>polymorphic_allocator</tt> and incomplete types</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3038">3038</a></td><td><tt>polymorphic_allocator::allocate</tt> should not allow integer overflow to create vulnerabilities</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3054">3054</a></td><td><tt>uninitialized_copy</tt> appears to not be able to meet its exception-safety guarantee</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3065">3065</a></td><td>LWG 2989 missed that all <tt>path</tt>'s other operators should be hidden friends as well</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3096">3096</a></td><td><tt>path::lexically_relative</tt> is confused by trailing slashes</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3116">3116</a></td><td><tt><i>OUTERMOST_ALLOC_TRAITS</i></tt> needs <tt>remove_reference_t</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3122">3122</a></td><td><tt>__cpp_lib_chrono_udls</tt> was accidentally dropped</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3127">3127</a></td><td><tt>basic_osyncstream::rdbuf</tt> needs a <tt>const_cast</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3128">3128</a></td><td><tt>strstream::rdbuf</tt> needs a <tt>const_cast</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3129">3129</a></td><td><tt>regex_token_iterator</tt> constructor uses wrong pointer arithmetic</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3130">3130</a></td><td>&sect;[input.output] needs many <tt>addressof</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3131">3131</a></td><td><tt>addressof</tt> all the things</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3132">3132</a></td><td>Library needs to ban macros named <tt>expects</tt> or <tt>ensures</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3134">3134</a></td><td>[fund.ts.v3] LFTSv3 contains extraneous [meta] variable templates that should have been deleted by P09961</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3137">3137</a></td><td>Header for <tt>__cpp_lib_to_chars</tt></td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3145">3145</a></td><td><tt>file_clock</tt> breaks ABI for C++17 implementations</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3147">3147</a></td><td>Definitions of "likely" and "unlikely" are likely to cause problems</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3148">3148</a></td><td><tt>&lt;concepts&gt;</tt> should be freestanding</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3153">3153</a></td><td><tt>Common</tt> and <tt>common_type</tt> have too little in common</td><td>San Diego</td><td></td></tr>
-<tr><td><a href="https://wg21.link/LWG3154">3154</a></td><td><tt>Common</tt> and <tt>CommonReference</tt> have a common defect</td><td>San Diego</td><td></td></tr>
+<table border="1">
+<tr><th>Issue #</th><th>Has P/R</th><th>Issue Name</th><th>Meeting</th><th>Status</th></tr>
+<tr><td><a href="https://wg21.link/LWG3012">3012</a></td><td>Yes</td><td><tt>atomic&lt;T&gt;</tt> is unimplementable for non-<tt>is_trivially_copy_constructible T</tt></td><td>Kona</td><td></td></tr>
+<tr><td><a href="https://wg21.link/LWG3040">3040</a></td><td>Yes</td><td><tt>basic_string_view::starts_with</tt> <i>Effects</i> are incorrect</td><td>Kona</td><td>Complete</td></tr>
+<tr><td><a href="https://wg21.link/LWG3077">3077</a></td><td>Yes</td><td><tt>(push|emplace)_back</tt> should invalidate the <tt>end</tt> iterator</td><td>Kona</td><td><i>Nothing to do</i></td></tr>
+<tr><td><a href="https://wg21.link/LWG3087">3087</a></td><td>Yes</td><td>One final <tt>&amp;x</tt> in &sect;[list.ops]</td><td>Kona</td><td><i>Nothing to do</i></td></tr>
+<tr><td><a href="https://wg21.link/LWG3101">3101</a></td><td>Yes</td><td><tt>span</tt>'s <tt>Container</tt> constructors need another constraint</td><td>Kona</td><td>Patch available</td></tr>
+<tr><td><a href="https://wg21.link/LWG3112">3112</a></td><td>Yes</td><td><tt>system_error</tt> and <tt>filesystem_error</tt> constructors taking a <tt>string</tt> may not be able  to meet their postconditions</td><td>Kona</td><td></td></tr>
+<tr><td><a href="https://wg21.link/LWG3119">3119</a></td><td>Yes</td><td>Program-definedness of closure types</td><td>Kona</td><td><i>Nothing to do</i></td></tr>
+<tr><td><a href="https://wg21.link/LWG3133">3133</a></td><td>Yes</td><td>Modernizing numeric type requirements</td><td>Kona</td><td></td></tr>
+<tr><td><a href="https://wg21.link/LWG3144">3144</a></td><td>Yes</td><td><tt>span</tt> does not have a <tt>const_pointer</tt> typedef</td><td>Kona</td><td>Patch available</td></tr>
+<tr><td><a href="https://wg21.link/LWG3173">3173</a></td><td>Yes</td><td>Enable CTAD for <i><tt>ref-view</tt></i></td><td>Kona</td><td></td></tr>
+<tr><td><a href="https://wg21.link/LWG3179">3179</a></td><td>Yes</td><td><tt>subrange</tt> should always model <tt>Range</tt></td><td>Kona</td><td></td></tr>
+<tr><td><a href="https://wg21.link/LWG3180">3180</a></td><td>Yes</td><td>Inconsistently named return type for <tt>ranges::minmax_element</tt></td><td>Kona</td><td></td></tr>
+<tr><td><a href="https://wg21.link/LWG3182">3182</a></td><td>Yes</td><td>Specification of <tt>Same</tt> could be clearer</td><td>Kona</td><td></td></tr>
+</table>
 
 </table>
 
@@ -109,42 +93,22 @@
 
 <h3>Comments about the issues</h3>
 <ul>
-<li>2183 - We're missing tests for match_results (copy ctor, move ctor). I committed them in r344988.</li>
-<li>2184 - We're missing tests for match_results (copy assign, move assing). I wrote them. Unfortunately, the move-assign test fails.</li>
-<li>2412 - </li>
-<li>2682 - Eric? </li>
-<li>2697 - </li>
-<li>2936 - </li>
-<li>2943 - Eric? I suspect that this is no change for us.</li>
-<li>2960 - </li>
-<li>2995 - We used to do this. Reverting r320604 and r321124 will get us back there.</li>
-<li>2996 - </li>
-<li>3008 - </li>
-<li>3025 - </li>
-<li>3031 - Marshall says: I don't think we have to do anything for this issue. Maybe some tests; maybe a static_assert.</li>
-<li>3037 - Marshall says: We don't have std::polymorphic_allocator yet.</li>
-<li>3038 - Marshall says: We don't have std::polymorphic_allocator yet.</li>
-<li>3054 - Marshall says: We already do this; may need to update some tests.</li>
-<li>3065 - </li>
-<li>3096 - Eric? </li>
-<li>3116 - </li>
-<li>3122 - Marshall says I have updated the comments in &lt;version&gt; and in the tests.</li>
-<li>3127 - Marshall says: We don't have basic_osyncstream yet.</li>
-<li>3128 - </li>
-<li>3129 - Marshall says: This is an easy change; I think this is more wording cleanup than anything. I will prepare a patch</li>
-<li>3130 - </li>
-<li>3131 - Only changes 11 & 12 affect libc++. </li>
-<li>3132 - Marshall says: I don't think we have to do anything for this issue</li>
-<li>3134 - Marshall says: I don't think we have to do anything for this issue</li>
-<li>3137 - Marshall says I have updated the comments in &lt;version&gt; and in the tests.</li>
-<li>3145 - Eric? </li>
-<li>3147 - Marshall - I don't think we have to do anything for this issue</li>
-<li>3148 - </li>
-<li>3153 - </li>
-<li>3154 - </li>
+<li>3012 - </li>
+<li>3040 - We already do this</li>
+<li>3077 - No changes required</li>
+<li>3087 - No changes required</li>
+<li>3101 - Patch: <a href="https://reviews.llvm.org/D57058">D57058</a></li>
+<li>3112 - Patch: <a href="https://reviews.llvm.org/D57312">D57312</a></li>
+<li>3119 - No changes required</li>
+<li>3133 - </li>
+<li>3144 - Patch: <a href="https://reviews.llvm.org/D57039">D57039</a></li>
+<li>3173 - We don't have ranges yet</li>
+<li>3179 - We don't have ranges yet</li>
+<li>3180 - We don't have ranges yet</li>
+<li>3182 - We don't have concepts yet</li>
 </ul>
 
-<p>Last Updated: 29-Oct-2018</p>
+<p>Last Updated: 21-Jan-2019</p>
 </div>
 </body>
 </html>